linux.git/net/sunrpc/cache.c, branch v5.7-rc2 Linux kernel source tree sunrpc: Add tracing for cache events 2020-03-16T16:04:34+00:00 Trond Myklebust trondmy@gmail.com 2020-03-01T23:21:44+00:00 78a947f50aaabd8d49e634a84f451c0933af853a Add basic tracing for debugging the sunrpc cache events. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> 
Add basic tracing for debugging the sunrpc cache events.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
SUNRPC/cache: Allow garbage collection of invalid cache entries 2020-03-16T16:04:34+00:00 Trond Myklebust trondmy@gmail.com 2020-03-01T23:21:43+00:00 277f27e2f27752cd1a7901443d72e908ddea8a2e If the cache entry never gets initialised, we want the garbage collector to be able to evict it. Otherwise if the upcall daemon fails to initialise the entry, we end up never expiring it. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> [ cel: resolved a merge conflict ] Signed-off-by: Chuck Lever <chuck.lever@oracle.com> 
If the cache entry never gets initialised, we want the garbage
collector to be able to evict it. Otherwise if the upcall daemon
fails to initialise the entry, we end up never expiring it.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
[ cel: resolved a merge conflict ]
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
nfsd: export upcalls must not return ESTALE when mountd is down 2020-03-16T16:04:33+00:00 Trond Myklebust trondmy@gmail.com 2020-03-01T23:21:42+00:00 65286b883c6de6b30928c837c47c167e82bde0b2 If the rpc.mountd daemon goes down, then that should not cause all exports to start failing with ESTALE errors. Let's explicitly distinguish between the cache upcall cases that need to time out, and those that do not. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> 
If the rpc.mountd daemon goes down, then that should not cause all
exports to start failing with ESTALE errors. Let's explicitly
distinguish between the cache upcall cases that need to time out,
and those that do not.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
sunrpc: Pass lockdep expression to RCU lists 2020-03-16T16:04:31+00:00 Amol Grover frextrite@gmail.com 2020-02-19T09:35:05+00:00 51cae673d036a32fe5cca9ec61765aa09e322c59 detail->hash_table[] is traversed using hlist_for_each_entry_rcu outside an RCU read-side critical section but under the protection of detail->hash_lock. Hence, add corresponding lockdep expression to silence false-positive warnings, and harden RCU lists. Signed-off-by: Amol Grover <frextrite@gmail.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> 
detail->hash_table[] is traversed using hlist_for_each_entry_rcu
outside an RCU read-side critical section but under the protection
of detail->hash_lock.

Hence, add corresponding lockdep expression to silence false-positive
warnings, and harden RCU lists.

Signed-off-by: Amol Grover <frextrite@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Merge tag 'nfsd-5.6' of git://linux-nfs.org/~bfields/linux 2020-02-08T01:50:21+00:00 Linus Torvalds torvalds@linux-foundation.org 2020-02-08T01:50:21+00:00 08dffcc7d94b7751663f1b0d66b45ff3a98375a2 Pull nfsd updates from Bruce Fields: "Highlights: - Server-to-server copy code from Olga. To use it, client and both servers must have support, the target server must be able to access the source server over NFSv4.2, and the target server must have the inter_copy_offload_enable module parameter set. - Improvements and bugfixes for the new filehandle cache, especially in the container case, from Trond - Also from Trond, better reporting of write errors. - Y2038 work from Arnd" * tag 'nfsd-5.6' of git://linux-nfs.org/~bfields/linux: (55 commits) sunrpc: expiry_time should be seconds not timeval nfsd: make nfsd_filecache_wq variable static nfsd4: fix double free in nfsd4_do_async_copy() nfsd: convert file cache to use over/underflow safe refcount nfsd: Define the file access mode enum for tracing nfsd: Fix a perf warning nfsd: Ensure sampling of the write verifier is atomic with the write nfsd: Ensure sampling of the commit verifier is atomic with the commit sunrpc: clean up cache entry add/remove from hashtable sunrpc: Fix potential leaks in sunrpc_cache_unhash() nfsd: Ensure exclusion between CLONE and WRITE errors nfsd: Pass the nfsd_file as arguments to nfsd4_clone_file_range() nfsd: Update the boot verifier on stable writes too. nfsd: Fix stable writes nfsd: Allow nfsd_vfs_write() to take the nfsd_file as an argument nfsd: Fix a soft lockup race in nfsd_file_mark_find_or_create() nfsd: Reduce the number of calls to nfsd_file_gc() nfsd: Schedule the laundrette regularly irrespective of file errors nfsd: Remove unused constant NFSD_FILE_LRU_RESCAN nfsd: Containerise filecache laundrette ... 
Pull nfsd updates from Bruce Fields:
 "Highlights:

   - Server-to-server copy code from Olga.

     To use it, client and both servers must have support, the target
     server must be able to access the source server over NFSv4.2, and
     the target server must have the inter_copy_offload_enable module
     parameter set.

   - Improvements and bugfixes for the new filehandle cache, especially
     in the container case, from Trond

   - Also from Trond, better reporting of write errors.

   - Y2038 work from Arnd"

* tag 'nfsd-5.6' of git://linux-nfs.org/~bfields/linux: (55 commits)
  sunrpc: expiry_time should be seconds not timeval
  nfsd: make nfsd_filecache_wq variable static
  nfsd4: fix double free in nfsd4_do_async_copy()
  nfsd: convert file cache to use over/underflow safe refcount
  nfsd: Define the file access mode enum for tracing
  nfsd: Fix a perf warning
  nfsd: Ensure sampling of the write verifier is atomic with the write
  nfsd: Ensure sampling of the commit verifier is atomic with the commit
  sunrpc: clean up cache entry add/remove from hashtable
  sunrpc: Fix potential leaks in sunrpc_cache_unhash()
  nfsd: Ensure exclusion between CLONE and WRITE errors
  nfsd: Pass the nfsd_file as arguments to nfsd4_clone_file_range()
  nfsd: Update the boot verifier on stable writes too.
  nfsd: Fix stable writes
  nfsd: Allow nfsd_vfs_write() to take the nfsd_file as an argument
  nfsd: Fix a soft lockup race in nfsd_file_mark_find_or_create()
  nfsd: Reduce the number of calls to nfsd_file_gc()
  nfsd: Schedule the laundrette regularly irrespective of file errors
  nfsd: Remove unused constant NFSD_FILE_LRU_RESCAN
  nfsd: Containerise filecache laundrette
  ...
proc: convert everything to "struct proc_ops" 2020-02-04T03:05:26+00:00 Alexey Dobriyan adobriyan@gmail.com 2020-02-04T01:37:17+00:00 97a32539b9568bb653683349e5a76d02ff3c3e2c The most notable change is DEFINE_SHOW_ATTRIBUTE macro split in seq_file.h. Conversion rule is: llseek => proc_lseek unlocked_ioctl => proc_ioctl xxx => proc_xxx delete ".owner = THIS_MODULE" line [akpm@linux-foundation.org: fix drivers/isdn/capi/kcapi_proc.c] [sfr@canb.auug.org.au: fix kernel/sched/psi.c] Link: http://lkml.kernel.org/r/20200122180545.36222f50@canb.auug.org.au Link: http://lkml.kernel.org/r/20191225172546.GB13378@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> 
The most notable change is DEFINE_SHOW_ATTRIBUTE macro split in
seq_file.h.

Conversion rule is:

	llseek		=> proc_lseek
	unlocked_ioctl	=> proc_ioctl

	xxx		=> proc_xxx

	delete ".owner = THIS_MODULE" line

[akpm@linux-foundation.org: fix drivers/isdn/capi/kcapi_proc.c]
[sfr@canb.auug.org.au: fix kernel/sched/psi.c]
  Link: http://lkml.kernel.org/r/20200122180545.36222f50@canb.auug.org.au
Link: http://lkml.kernel.org/r/20191225172546.GB13378@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
sunrpc: clean up cache entry add/remove from hashtable 2020-01-22T21:25:41+00:00 Trond Myklebust trondmy@gmail.com 2020-01-06T18:40:35+00:00 809fe3c533789ebb51c1873b80c7dafbad9dbf19 Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> 
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
sunrpc: Fix potential leaks in sunrpc_cache_unhash() 2020-01-22T21:25:41+00:00 Trond Myklebust trondmy@gmail.com 2020-01-06T18:40:34+00:00 1d82163714c16ebe09c7a8c9cd3cef7abcc16208 When we unhash the cache entry, we need to handle any pending upcalls by calling cache_fresh_unlocked(). Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> 
When we unhash the cache entry, we need to handle any pending upcalls
by calling cache_fresh_unlocked().

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
nfs: use time64_t internally 2019-12-18T17:07:32+00:00 Arnd Bergmann arnd@arndb.de 2017-10-20T14:34:42+00:00 f559935e7ce4e5d448bb6588f7fa82b0cc2cc2c0 The timestamps for the cache are all in boottime seconds, so they don't overflow 32-bit values, but the use of time_t is deprecated because it generally does overflow when used with wall-clock time. There are multiple possible ways of avoiding it: - leave time_t, which is safe here, but forces others to look into this code to determine that it is over and over. - use a more generic type, like 'int' or 'long', which is known to be sufficient here but loses the documentation of referring to timestamps - use ktime_t everywhere, and convert into seconds in the few places where we want realtime-seconds. The conversion is sometimes expensive, but not more so than the conversion we do today. - use time64_t to clarify that this code is safe. Nothing would change for 64-bit architectures, but it is slightly less efficient on 32-bit architectures. Without a clear winner of the three approaches above, this picks the last one, favouring readability over a small performance loss on 32-bit architectures. Signed-off-by: Arnd Bergmann <arnd@arndb.de> 
The timestamps for the cache are all in boottime seconds, so they
don't overflow 32-bit values, but the use of time_t is deprecated
because it generally does overflow when used with wall-clock time.

There are multiple possible ways of avoiding it:

- leave time_t, which is safe here, but forces others to
  look into this code to determine that it is over and over.

- use a more generic type, like 'int' or 'long', which is known
  to be sufficient here but loses the documentation of referring
  to timestamps

- use ktime_t everywhere, and convert into seconds in the few
  places where we want realtime-seconds. The conversion is
  sometimes expensive, but not more so than the conversion we
  do today.

- use time64_t to clarify that this code is safe. Nothing would
  change for 64-bit architectures, but it is slightly less
  efficient on 32-bit architectures.

Without a clear winner of the three approaches above, this picks
the last one, favouring readability over a small performance
loss on 32-bit architectures.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
sunrpc: fix crash when cache_head become valid before update 2019-10-11T17:13:49+00:00 Pavel Tikhomirov ptikhomirov@virtuozzo.com 2019-10-01T08:03:59+00:00 5fcaf6982d1167f1cd9b264704f6d1ef4c505d54 I was investigating a crash in our Virtuozzo7 kernel which happened in in svcauth_unix_set_client. I found out that we access m_client field in ip_map structure, which was received from sunrpc_cache_lookup (we have a bit older kernel, now the code is in sunrpc_cache_add_entry), and these field looks uninitialized (m_client == 0x74 don't look like a pointer) but in the cache_head in flags we see 0x1 which is CACHE_VALID. It looks like the problem appeared from our previous fix to sunrpc (1): commit 4ecd55ea0742 ("sunrpc: fix cache_head leak due to queued request") And we've also found a patch already fixing our patch (2): commit d58431eacb22 ("sunrpc: don't mark uninitialised items as VALID.") Though the crash is eliminated, I think the core of the problem is not completely fixed: Neil in the patch (2) makes cache_head CACHE_NEGATIVE, before cache_fresh_locked which was added in (1) to fix crash. These way cache_is_valid won't say the cache is valid anymore and in svcauth_unix_set_client the function cache_check will return error instead of 0, and we don't count entry as initialized. But it looks like we need to remove cache_fresh_locked completely in sunrpc_cache_lookup: In (1) we've only wanted to make cache_fresh_unlocked->cache_dequeue so that cache_requests with no readers also release corresponding cache_head, to fix their leak. We with Vasily were not sure if cache_fresh_locked and cache_fresh_unlocked should be used in pair or not, so we've guessed to use them in pair. Now we see that we don't want the CACHE_VALID bit set here by cache_fresh_locked, as "valid" means "initialized" and there is no initialization in sunrpc_cache_add_entry. Both expiry_time and last_refresh are not used in cache_fresh_unlocked code-path and also not required for the initial fix. So to conclude cache_fresh_locked was called by mistake, and we can just safely remove it instead of crutching it with CACHE_NEGATIVE. It looks ideologically better for me. Hope I don't miss something here. Here is our crash backtrace: [13108726.326291] BUG: unable to handle kernel NULL pointer dereference at 0000000000000074 [13108726.326365] IP: [<ffffffffc01f79eb>] svcauth_unix_set_client+0x2ab/0x520 [sunrpc] [13108726.326448] PGD 0 [13108726.326468] Oops: 0002 [#1] SMP [13108726.326497] Modules linked in: nbd isofs xfs loop kpatch_cumulative_81_0_r1(O) xt_physdev nfnetlink_queue bluetooth rfkill ip6table_nat nf_nat_ipv6 ip_vs_wrr ip_vs_wlc ip_vs_sh nf_conntrack_netlink ip_vs_sed ip_vs_pe_sip nf_conntrack_sip ip_vs_nq ip_vs_lc ip_vs_lblcr ip_vs_lblc ip_vs_ftp ip_vs_dh nf_nat_ftp nf_conntrack_ftp iptable_raw xt_recent nf_log_ipv6 xt_hl ip6t_rt nf_log_ipv4 nf_log_common xt_LOG xt_limit xt_TCPMSS xt_tcpmss vxlan ip6_udp_tunnel udp_tunnel xt_statistic xt_NFLOG nfnetlink_log dummy xt_mark xt_REDIRECT nf_nat_redirect raw_diag udp_diag tcp_diag inet_diag netlink_diag af_packet_diag unix_diag rpcsec_gss_krb5 xt_addrtype ip6t_rpfilter ipt_REJECT nf_reject_ipv4 ip6t_REJECT nf_reject_ipv6 ebtable_nat ebtable_broute nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_mangle ip6table_raw nfsv4 [13108726.327173] dns_resolver cls_u32 binfmt_misc arptable_filter arp_tables ip6table_filter ip6_tables devlink fuse_kio_pcs ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_nat iptable_nat nf_nat_ipv4 xt_comment nf_conntrack_ipv4 nf_defrag_ipv4 xt_wdog_tmo xt_multiport bonding xt_set xt_conntrack iptable_filter iptable_mangle kpatch(O) ebtable_filter ebt_among ebtables ip_set_hash_ip ip_set nfnetlink vfat fat skx_edac intel_powerclamp coretemp intel_rapl iosf_mbi kvm_intel kvm irqbypass fuse pcspkr ses enclosure joydev sg mei_me hpwdt hpilo lpc_ich mei ipmi_si shpchp ipmi_devintf ipmi_msghandler xt_ipvs acpi_power_meter ip_vs_rr nfsv3 nfsd auth_rpcgss nfs_acl nfs lockd grace fscache nf_nat cls_fw sch_htb sch_cbq sch_sfq ip_vs em_u32 nf_conntrack tun br_netfilter veth overlay ip6_vzprivnet ip6_vznetstat ip_vznetstat [13108726.327817] ip_vzprivnet vziolimit vzevent vzlist vzstat vznetstat vznetdev vzmon vzdev bridge pio_kaio pio_nfs pio_direct pfmt_raw pfmt_ploop1 ploop ip_tables ext4 mbcache jbd2 sd_mod crc_t10dif crct10dif_generic mgag200 i2c_algo_bit drm_kms_helper scsi_transport_iscsi 8021q syscopyarea sysfillrect garp sysimgblt fb_sys_fops mrp stp ttm llc bnx2x crct10dif_pclmul crct10dif_common crc32_pclmul crc32c_intel drm dm_multipath ghash_clmulni_intel uas aesni_intel lrw gf128mul glue_helper ablk_helper cryptd tg3 smartpqi scsi_transport_sas mdio libcrc32c i2c_core usb_storage ptp pps_core wmi sunrpc dm_mirror dm_region_hash dm_log dm_mod [last unloaded: kpatch_cumulative_82_0_r1] [13108726.328403] CPU: 35 PID: 63742 Comm: nfsd ve: 51332 Kdump: loaded Tainted: G W O ------------ 3.10.0-862.20.2.vz7.73.29 #1 73.29 [13108726.328491] Hardware name: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen10, BIOS U32 10/02/2018 [13108726.328554] task: ffffa0a6a41b1160 ti: ffffa0c2a74bc000 task.ti: ffffa0c2a74bc000 [13108726.328610] RIP: 0010:[<ffffffffc01f79eb>] [<ffffffffc01f79eb>] svcauth_unix_set_client+0x2ab/0x520 [sunrpc] [13108726.328706] RSP: 0018:ffffa0c2a74bfd80 EFLAGS: 00010246 [13108726.328750] RAX: 0000000000000001 RBX: ffffa0a6183ae000 RCX: 0000000000000000 [13108726.328811] RDX: 0000000000000074 RSI: 0000000000000286 RDI: ffffa0c2a74bfcf0 [13108726.328864] RBP: ffffa0c2a74bfe00 R08: ffffa0bab8c22960 R09: 0000000000000001 [13108726.328916] R10: 0000000000000001 R11: 0000000000000001 R12: ffffa0a32aa7f000 [13108726.328969] R13: ffffa0a6183afac0 R14: ffffa0c233d88d00 R15: ffffa0c2a74bfdb4 [13108726.329022] FS: 0000000000000000(0000) GS:ffffa0e17f9c0000(0000) knlGS:0000000000000000 [13108726.329081] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [13108726.332311] CR2: 0000000000000074 CR3: 00000026a1b28000 CR4: 00000000007607e0 [13108726.334606] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [13108726.336754] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [13108726.338908] PKRU: 00000000 [13108726.341047] Call Trace: [13108726.343074] [<ffffffff8a2c78b4>] ? groups_alloc+0x34/0x110 [13108726.344837] [<ffffffffc01f5eb4>] svc_set_client+0x24/0x30 [sunrpc] [13108726.346631] [<ffffffffc01f2ac1>] svc_process_common+0x241/0x710 [sunrpc] [13108726.348332] [<ffffffffc01f3093>] svc_process+0x103/0x190 [sunrpc] [13108726.350016] [<ffffffffc07d605f>] nfsd+0xdf/0x150 [nfsd] [13108726.351735] [<ffffffffc07d5f80>] ? nfsd_destroy+0x80/0x80 [nfsd] [13108726.353459] [<ffffffff8a2bf741>] kthread+0xd1/0xe0 [13108726.355195] [<ffffffff8a2bf670>] ? create_kthread+0x60/0x60 [13108726.356896] [<ffffffff8a9556dd>] ret_from_fork_nospec_begin+0x7/0x21 [13108726.358577] [<ffffffff8a2bf670>] ? create_kthread+0x60/0x60 [13108726.360240] Code: 4c 8b 45 98 0f 8e 2e 01 00 00 83 f8 fe 0f 84 76 fe ff ff 85 c0 0f 85 2b 01 00 00 49 8b 50 40 b8 01 00 00 00 48 89 93 d0 1a 00 00 <f0> 0f c1 02 83 c0 01 83 f8 01 0f 8e 53 02 00 00 49 8b 44 24 38 [13108726.363769] RIP [<ffffffffc01f79eb>] svcauth_unix_set_client+0x2ab/0x520 [sunrpc] [13108726.365530] RSP <ffffa0c2a74bfd80> [13108726.367179] CR2: 0000000000000074 Fixes: d58431eacb22 ("sunrpc: don't mark uninitialised items as VALID.") Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com> Acked-by: NeilBrown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@redhat.com> 
I was investigating a crash in our Virtuozzo7 kernel which happened in
in svcauth_unix_set_client. I found out that we access m_client field
in ip_map structure, which was received from sunrpc_cache_lookup (we
have a bit older kernel, now the code is in sunrpc_cache_add_entry), and
these field looks uninitialized (m_client == 0x74 don't look like a
pointer) but in the cache_head in flags we see 0x1 which is CACHE_VALID.

It looks like the problem appeared from our previous fix to sunrpc (1):
commit 4ecd55ea0742 ("sunrpc: fix cache_head leak due to queued
request")

And we've also found a patch already fixing our patch (2):
commit d58431eacb22 ("sunrpc: don't mark uninitialised items as VALID.")

Though the crash is eliminated, I think the core of the problem is not
completely fixed:

Neil in the patch (2) makes cache_head CACHE_NEGATIVE, before
cache_fresh_locked which was added in (1) to fix crash. These way
cache_is_valid won't say the cache is valid anymore and in
svcauth_unix_set_client the function cache_check will return error
instead of 0, and we don't count entry as initialized.

But it looks like we need to remove cache_fresh_locked completely in
sunrpc_cache_lookup:

In (1) we've only wanted to make cache_fresh_unlocked->cache_dequeue so
that cache_requests with no readers also release corresponding
cache_head, to fix their leak.  We with Vasily were not sure if
cache_fresh_locked and cache_fresh_unlocked should be used in pair or
not, so we've guessed to use them in pair.

Now we see that we don't want the CACHE_VALID bit set here by
cache_fresh_locked, as "valid" means "initialized" and there is no
initialization in sunrpc_cache_add_entry. Both expiry_time and
last_refresh are not used in cache_fresh_unlocked code-path and also not
required for the initial fix.

So to conclude cache_fresh_locked was called by mistake, and we can just
safely remove it instead of crutching it with CACHE_NEGATIVE. It looks
ideologically better for me. Hope I don't miss something here.

Here is our crash backtrace:
[13108726.326291] BUG: unable to handle kernel NULL pointer dereference at 0000000000000074
[13108726.326365] IP: [<ffffffffc01f79eb>] svcauth_unix_set_client+0x2ab/0x520 [sunrpc]
[13108726.326448] PGD 0
[13108726.326468] Oops: 0002 [#1] SMP
[13108726.326497] Modules linked in: nbd isofs xfs loop kpatch_cumulative_81_0_r1(O) xt_physdev nfnetlink_queue bluetooth rfkill ip6table_nat nf_nat_ipv6 ip_vs_wrr ip_vs_wlc ip_vs_sh nf_conntrack_netlink ip_vs_sed ip_vs_pe_sip nf_conntrack_sip ip_vs_nq ip_vs_lc ip_vs_lblcr ip_vs_lblc ip_vs_ftp ip_vs_dh nf_nat_ftp nf_conntrack_ftp iptable_raw xt_recent nf_log_ipv6 xt_hl ip6t_rt nf_log_ipv4 nf_log_common xt_LOG xt_limit xt_TCPMSS xt_tcpmss vxlan ip6_udp_tunnel udp_tunnel xt_statistic xt_NFLOG nfnetlink_log dummy xt_mark xt_REDIRECT nf_nat_redirect raw_diag udp_diag tcp_diag inet_diag netlink_diag af_packet_diag unix_diag rpcsec_gss_krb5 xt_addrtype ip6t_rpfilter ipt_REJECT nf_reject_ipv4 ip6t_REJECT nf_reject_ipv6 ebtable_nat ebtable_broute nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_mangle ip6table_raw nfsv4
[13108726.327173]  dns_resolver cls_u32 binfmt_misc arptable_filter arp_tables ip6table_filter ip6_tables devlink fuse_kio_pcs ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_nat iptable_nat nf_nat_ipv4 xt_comment nf_conntrack_ipv4 nf_defrag_ipv4 xt_wdog_tmo xt_multiport bonding xt_set xt_conntrack iptable_filter iptable_mangle kpatch(O) ebtable_filter ebt_among ebtables ip_set_hash_ip ip_set nfnetlink vfat fat skx_edac intel_powerclamp coretemp intel_rapl iosf_mbi kvm_intel kvm irqbypass fuse pcspkr ses enclosure joydev sg mei_me hpwdt hpilo lpc_ich mei ipmi_si shpchp ipmi_devintf ipmi_msghandler xt_ipvs acpi_power_meter ip_vs_rr nfsv3 nfsd auth_rpcgss nfs_acl nfs lockd grace fscache nf_nat cls_fw sch_htb sch_cbq sch_sfq ip_vs em_u32 nf_conntrack tun br_netfilter veth overlay ip6_vzprivnet ip6_vznetstat ip_vznetstat
[13108726.327817]  ip_vzprivnet vziolimit vzevent vzlist vzstat vznetstat vznetdev vzmon vzdev bridge pio_kaio pio_nfs pio_direct pfmt_raw pfmt_ploop1 ploop ip_tables ext4 mbcache jbd2 sd_mod crc_t10dif crct10dif_generic mgag200 i2c_algo_bit drm_kms_helper scsi_transport_iscsi 8021q syscopyarea sysfillrect garp sysimgblt fb_sys_fops mrp stp ttm llc bnx2x crct10dif_pclmul crct10dif_common crc32_pclmul crc32c_intel drm dm_multipath ghash_clmulni_intel uas aesni_intel lrw gf128mul glue_helper ablk_helper cryptd tg3 smartpqi scsi_transport_sas mdio libcrc32c i2c_core usb_storage ptp pps_core wmi sunrpc dm_mirror dm_region_hash dm_log dm_mod [last unloaded: kpatch_cumulative_82_0_r1]
[13108726.328403] CPU: 35 PID: 63742 Comm: nfsd ve: 51332 Kdump: loaded Tainted: G        W  O   ------------   3.10.0-862.20.2.vz7.73.29 #1 73.29
[13108726.328491] Hardware name: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen10, BIOS U32 10/02/2018
[13108726.328554] task: ffffa0a6a41b1160 ti: ffffa0c2a74bc000 task.ti: ffffa0c2a74bc000
[13108726.328610] RIP: 0010:[<ffffffffc01f79eb>]  [<ffffffffc01f79eb>] svcauth_unix_set_client+0x2ab/0x520 [sunrpc]
[13108726.328706] RSP: 0018:ffffa0c2a74bfd80  EFLAGS: 00010246
[13108726.328750] RAX: 0000000000000001 RBX: ffffa0a6183ae000 RCX: 0000000000000000
[13108726.328811] RDX: 0000000000000074 RSI: 0000000000000286 RDI: ffffa0c2a74bfcf0
[13108726.328864] RBP: ffffa0c2a74bfe00 R08: ffffa0bab8c22960 R09: 0000000000000001
[13108726.328916] R10: 0000000000000001 R11: 0000000000000001 R12: ffffa0a32aa7f000
[13108726.328969] R13: ffffa0a6183afac0 R14: ffffa0c233d88d00 R15: ffffa0c2a74bfdb4
[13108726.329022] FS:  0000000000000000(0000) GS:ffffa0e17f9c0000(0000) knlGS:0000000000000000
[13108726.329081] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[13108726.332311] CR2: 0000000000000074 CR3: 00000026a1b28000 CR4: 00000000007607e0
[13108726.334606] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[13108726.336754] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[13108726.338908] PKRU: 00000000
[13108726.341047] Call Trace:
[13108726.343074]  [<ffffffff8a2c78b4>] ? groups_alloc+0x34/0x110
[13108726.344837]  [<ffffffffc01f5eb4>] svc_set_client+0x24/0x30 [sunrpc]
[13108726.346631]  [<ffffffffc01f2ac1>] svc_process_common+0x241/0x710 [sunrpc]
[13108726.348332]  [<ffffffffc01f3093>] svc_process+0x103/0x190 [sunrpc]
[13108726.350016]  [<ffffffffc07d605f>] nfsd+0xdf/0x150 [nfsd]
[13108726.351735]  [<ffffffffc07d5f80>] ? nfsd_destroy+0x80/0x80 [nfsd]
[13108726.353459]  [<ffffffff8a2bf741>] kthread+0xd1/0xe0
[13108726.355195]  [<ffffffff8a2bf670>] ? create_kthread+0x60/0x60
[13108726.356896]  [<ffffffff8a9556dd>] ret_from_fork_nospec_begin+0x7/0x21
[13108726.358577]  [<ffffffff8a2bf670>] ? create_kthread+0x60/0x60
[13108726.360240] Code: 4c 8b 45 98 0f 8e 2e 01 00 00 83 f8 fe 0f 84 76 fe ff ff 85 c0 0f 85 2b 01 00 00 49 8b 50 40 b8 01 00 00 00 48 89 93 d0 1a 00 00 <f0> 0f c1 02 83 c0 01 83 f8 01 0f 8e 53 02 00 00 49 8b 44 24 38
[13108726.363769] RIP  [<ffffffffc01f79eb>] svcauth_unix_set_client+0x2ab/0x520 [sunrpc]
[13108726.365530]  RSP <ffffa0c2a74bfd80>
[13108726.367179] CR2: 0000000000000074

Fixes: d58431eacb22 ("sunrpc: don't mark uninitialised items as VALID.")
Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Acked-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>