KCSAN: data-race in dec_zone_page_state / release_pages (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 80145ac2 Merge tag 's390-5.10-5' of git://git.kernel.org/p..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12932243500000
kernel config: https://syzkaller.appspot.com/x/.config?x=cf114765a0c30afa
dashboard link: https://syzkaller.appspot.com/bug?extid=bbb9547f8cb5f6b11d98
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project.git 913f6005669cfb590c99865a90bc51ed0983d09d)
CC: [ak...@linux-foundation.org linux-...@vger.kernel.org linu...@kvack.org]

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bbb954...@syzkaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in dec_zone_page_state / release_pages

write to 0xffffea000465b180 of 8 bytes by task 11092 on cpu 0:
instrument_write include/linux/instrumented.h:42 [inline]
__clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:42 [inline]
__ClearPageLRU include/linux/page-flags.h:337 [inline]
release_pages+0x41c/0x8b0 mm/swap.c:940
__pagevec_release+0xa7/0xd0 mm/swap.c:972
pagevec_release include/linux/pagevec.h:88 [inline]
truncate_inode_pages_range+0x517/0xf20 mm/truncate.c:370
truncate_inode_pages mm/truncate.c:476 [inline]
truncate_inode_pages_final+0x7d/0x90 mm/truncate.c:527
ext4_evict_inode+0x2b7/0xe70 fs/ext4/inode.c:221
evict+0x19f/0x470 fs/inode.c:578
iput_final fs/inode.c:1654 [inline]
iput+0x421/0x510 fs/inode.c:1680
dentry_unlink_inode+0x1f3/0x210 fs/dcache.c:374
__dentry_kill+0x28b/0x450 fs/dcache.c:579
dentry_kill fs/dcache.c:692 [inline]
dput+0x203/0x420 fs/dcache.c:878
cleanup_mnt+0x265/0x2e0 fs/namespace.c:1117
__cleanup_mnt+0x15/0x20 fs/namespace.c:1125
task_work_run+0x8e/0x110 kernel/task_work.c:151
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop kernel/entry/common.c:164 [inline]
exit_to_user_mode_prepare+0x13c/0x170 kernel/entry/common.c:191
syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:266
do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffea000465b180 of 8 bytes by task 3165 on cpu 1:
page_to_nid include/linux/mm.h:1302 [inline]
page_zone include/linux/mm.h:1444 [inline]
dec_zone_page_state+0x13/0x100 mm/vmstat.c:542
test_clear_page_writeback+0x3ba/0x450 mm/page-writeback.c:2765
end_page_writeback+0xa7/0x110 mm/filemap.c:1487
ext4_finish_bio+0x429/0x490 fs/ext4/page-io.c:146
ext4_release_io_end+0x98/0x200 fs/ext4/page-io.c:161
ext4_end_io_end fs/ext4/page-io.c:195 [inline]
ext4_do_flush_completed_IO fs/ext4/page-io.c:260 [inline]
ext4_end_io_rsv_work+0x306/0x360 fs/ext4/page-io.c:274
process_one_work+0x3e1/0x950 kernel/workqueue.c:2272
worker_thread+0x635/0xb90 kernel/workqueue.c:2418
kthread+0x1fd/0x220 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3165 Comm: kworker/u4:4 Not tainted 5.10.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work
==================================================================


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.