Hello,
syzbot found the following issue on:
HEAD commit: eccc8767 Merge branch 'fixes' of git://
git.kernel.org/pub/..
git tree: upstream
console output:
https://syzkaller.appspot.com/x/log.txt?x=16233156500000
kernel config:
https://syzkaller.appspot.com/x/.config?x=671e27f23e60a67b
dashboard link:
https://syzkaller.appspot.com/bug?extid=bc8df8e864fb2068f890
compiler: clang version 12.0.0 (
https://github.com/llvm/llvm-project.git 913f6005669cfb590c99865a90bc51ed0983d09d)
CC: [
ax...@kernel.dk linux...@vger.kernel.org linux-...@vger.kernel.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+bc8df8...@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in wb_timer_fn / wbt_inflight_cb
write to 0xffff888141e5ae00 of 4 bytes by interrupt on cpu 0:
calc_wb_limits block/blk-wbt.c:305 [inline]
scale_up block/blk-wbt.c:313 [inline]
wb_timer_fn+0x415/0xa00 block/blk-wbt.c:382
blk_stat_timer_fn+0x3f4/0x410 block/blk-stat.c:99
call_timer_fn+0x2e/0x240 kernel/time/timer.c:1410
expire_timers+0x116/0x260 kernel/time/timer.c:1455
__run_timers+0x328/0x3c0 kernel/time/timer.c:1747
run_timer_softirq+0x19/0x30 kernel/time/timer.c:1760
__do_softirq+0x12c/0x2b1 kernel/softirq.c:298
asm_call_irq_on_stack+0xf/0x20
__run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
do_softirq_own_stack+0x32/0x40 arch/x86/kernel/irq_64.c:77
invoke_softirq kernel/softirq.c:393 [inline]
__irq_exit_rcu+0xb2/0xc0 kernel/softirq.c:423
sysvec_apic_timer_interrupt+0x74/0x90 arch/x86/kernel/apic/apic.c:1091
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
kcsan_setup_watchpoint+0x1ec/0x4d0 kernel/kcsan/core.c:591
tomoyo_path_matches_pattern+0x29/0x120 security/tomoyo/util.c:936
tomoyo_compare_name_union security/tomoyo/file.c:87 [inline]
tomoyo_check_path_acl+0x9b/0xe0 security/tomoyo/file.c:260
tomoyo_check_acl+0xcc/0x200 security/tomoyo/domain.c:175
tomoyo_path_permission security/tomoyo/file.c:586 [inline]
tomoyo_path_perm+0x22f/0x330 security/tomoyo/file.c:838
tomoyo_inode_getattr+0x18/0x20 security/tomoyo/tomoyo.c:123
security_inode_getattr+0x7f/0xd0 security/security.c:1279
vfs_getattr fs/stat.c:121 [inline]
vfs_statx+0xf8/0x270 fs/stat.c:189
vfs_fstatat fs/stat.c:207 [inline]
vfs_lstat include/linux/fs.h:3109 [inline]
__do_sys_newlstat fs/stat.c:362 [inline]
__se_sys_newlstat+0x46/0x250 fs/stat.c:356
__x64_sys_newlstat+0x2d/0x40 fs/stat.c:356
do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
read to 0xffff888141e5ae00 of 4 bytes by task 8457 on cpu 1:
get_limit block/blk-wbt.c:473 [inline]
wbt_inflight_cb+0xc6/0x220 block/blk-wbt.c:495
rq_qos_wait+0xac/0x210 block/blk-rq-qos.c:266
__wbt_wait block/blk-wbt.c:518 [inline]
wbt_wait+0x1bb/0x2b0 block/blk-wbt.c:583
__rq_qos_throttle+0x39/0x70 block/blk-rq-qos.c:72
rq_qos_throttle block/blk-rq-qos.h:182 [inline]
blk_mq_submit_bio+0x233/0x1020 block/blk-mq.c:2174
__submit_bio_noacct_mq block/blk-core.c:1026 [inline]
submit_bio_noacct+0x77d/0x930 block/blk-core.c:1059
submit_bio+0x1f3/0x360 block/blk-core.c:1129
submit_bh_wbc+0x38c/0x3d0 fs/buffer.c:3054
__block_write_full_page+0x618/0x9e0 fs/buffer.c:1810
block_write_full_page+0x15d/0x190 fs/buffer.c:2980
blkdev_writepage+0x20/0x30 fs/block_dev.c:627
__writepage+0x32/0xc0 mm/page-writeback.c:2311
write_cache_pages+0x4bc/0x7f0 mm/page-writeback.c:2246
generic_writepages+0x64/0xa0 mm/page-writeback.c:2337
blkdev_writepages+0x19/0x20 fs/block_dev.c:1946
do_writepages+0x7b/0x150 mm/page-writeback.c:2352
__filemap_fdatawrite_range+0x19d/0x1d0 mm/filemap.c:422
__filemap_fdatawrite mm/filemap.c:430 [inline]
filemap_flush+0x1f/0x30 mm/filemap.c:457
__sync_blockdev+0x69/0x70 fs/block_dev.c:508
__sync_filesystem fs/sync.c:40 [inline]
sync_filesystem+0xcb/0x160 fs/sync.c:64
generic_shutdown_super+0x3c/0x1f0 fs/super.c:448
kill_block_super+0x4a/0x90 fs/super.c:1446
deactivate_locked_super+0x6a/0xb0 fs/super.c:335
deactivate_super+0x85/0x90 fs/super.c:366
cleanup_mnt+0x277/0x2e0 fs/namespace.c:1118
__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
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8457 Comm: syz-executor.1 Not tainted 5.10.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
---
This report is generated by a bot. It may contain errors.
See
https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at
syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.