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| author | Chen Cheng <chencheng@fnnas.com> | 2026-06-23 15:59:40 +0800 |
|---|---|---|
| committer | Yu Kuai <yukuai@fygo.io> | 2026-07-30 16:28:11 +0800 |
| commit | e12e619c2e2d0c3f42b14e9ef1ab778e696ffffd (patch) | |
| tree | 11465c6e95c19fe933dda79095de7d89d2b2d0c1 /tools/perf/scripts/python/stackcollapse.py | |
| parent | 371f7a1b392edc8b7cf449cc7713179b588f2d0e (diff) | |
md/raid1: protect sequential read hints for read balance
The patch just suppress KCSAN noise. No functional change.
KCSAN reports a race, point to update_read_sectors() update next_seq_sect vs.
read next_seq_sect.
Protect next_seq_sect and seq_start with READ_ONCE/WRITE_ONCE, otherwise,
read balance see stale sequential-read hints.
KCSAN report:
==============
BUG: KCSAN: data-race in raid1_read_request / raid1_read_request
write to 0xffff8e3a2d6736d0 of 8 bytes by task 593784 on cpu 10:
raid1_read_request+0xe5a/0x19f0
raid1_make_request+0xdf/0x1990
md_handle_request+0x4a2/0xa40
[...]
read to 0xffff8e3a2d6736d0 of 8 bytes by task 593776 on cpu 11:
raid1_read_request+0xe3f/0x19f0
raid1_make_request+0xdf/0x1990
md_handle_request+0x4a2/0xa40
[...]
value changed: 0x0000000000356368 -> 0x0000000000356370
Signed-off-by: Chen Cheng <chencheng@fnnas.com>
Reviewed-by: Yu Kuai <yukuai@fygo.io>
Link: https://patch.msgid.link/20260623075940.2476255-1-chencheng@fnnas.com
Signed-off-by: Yu Kuai <yukuai@fygo.io>
Diffstat (limited to 'tools/perf/scripts/python/stackcollapse.py')
0 files changed, 0 insertions, 0 deletions