syzbot

EXT4-fs (loop1): unmounting filesystem 00000000-0000-0000-0000-000000000000.
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BUG: KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru

write to 0xffff888237d2bb10 of 8 bytes by task 28951 on cpu 1:
 __invalidate_bh_lrus fs/buffer.c:1505 [inline]
 invalidate_bh_lru+0x8b/0xf0 fs/buffer.c:1517
 csd_do_func kernel/smp.c:134 [inline]
 smp_call_function_many_cond+0x690/0xc20 kernel/smp.c:875
 on_each_cpu_cond_mask+0x3c/0x90 kernel/smp.c:1051
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1536
 invalidate_bdev+0x42/0x70 block/bdev.c:100
 loop_set_status+0x114/0x540 drivers/block/loop.c:1264
 lo_ioctl+0x7f1/0x11c0
 blkdev_ioctl+0x359/0x450 block/ioctl.c:693
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xcd/0x140 fs/ioctl.c:893
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:893
 x64_sys_call+0x15cc/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237d2bb10 of 8 bytes by task 23762 on cpu 0:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1527
 smp_call_function_many_cond+0x2d5/0xc20 kernel/smp.c:837
 on_each_cpu_cond_mask+0x3c/0x90 kernel/smp.c:1051
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1536
 kill_bdev block/bdev.c:90 [inline]
 blkdev_flush_mapping+0x9b/0x1a0 block/bdev.c:671
 blkdev_put_whole block/bdev.c:678 [inline]
 bdev_release+0x2f9/0x420 block/bdev.c:1103
 blkdev_release+0x15/0x20 block/fops.c:639
 __fput+0x17a/0x6d0 fs/file_table.c:431
 ____fput+0x1c/0x30 fs/file_table.c:459
 task_work_run+0x13a/0x1a0 kernel/task_work.c:228
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xbe/0x130 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff888124ee9dd0 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 23762 Comm: syz-executor Not tainted 6.12.0-rc3-syzkaller-00403-gf9e4825524aa #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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