syzbot

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BUG: KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru

write to 0xffff888237c296b8 of 8 bytes by task 20961 on cpu 0:
 __invalidate_bh_lrus fs/buffer.c:1381 [inline]
 invalidate_bh_lru+0x9f/0xf0 fs/buffer.c:1393
 smp_call_function_many_cond+0x4e4/0x640 kernel/smp.c:978
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1155
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1412
 kill_bdev block/bdev.c:75 [inline]
 blkdev_flush_mapping+0xb6/0x1c0 block/bdev.c:662
 blkdev_put_whole block/bdev.c:693 [inline]
 blkdev_put+0x36d/0x470 block/bdev.c:953
 kill_block_super+0x83/0xa0 fs/super.c:1389
 deactivate_locked_super+0x6b/0xd0 fs/super.c:332
 deactivate_super+0x9b/0xb0 fs/super.c:363
 cleanup_mnt+0x23e/0x2a0 fs/namespace.c:1291
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1298
 task_work_run+0x123/0x160 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xcf/0xe0 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0x6a/0xa0 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888237c296b8 of 8 bytes by task 3140 on cpu 1:
 has_bh_in_lru+0x35/0x1e0 fs/buffer.c:1403
 smp_call_function_many_cond+0x300/0x640 kernel/smp.c:935
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1155
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1412
 kill_bdev block/bdev.c:75 [inline]
 blkdev_flush_mapping+0xb6/0x1c0 block/bdev.c:662
 blkdev_put_whole block/bdev.c:693 [inline]
 blkdev_put+0x36d/0x470 block/bdev.c:953
 kill_block_super+0x83/0xa0 fs/super.c:1389
 deactivate_locked_super+0x6b/0xd0 fs/super.c:332
 deactivate_super+0x9b/0xb0 fs/super.c:363
 cleanup_mnt+0x23e/0x2a0 fs/namespace.c:1291
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1298
 task_work_run+0x123/0x160 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xcf/0xe0 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0x6a/0xa0 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0xffff88810ab63b60 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3140 Comm: syz-executor.3 Not tainted 6.2.0-rc8-syzkaller-00098-gec35307e18ba-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
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EXT4-fs (loop3): unmounting filesystem 00000000-0000-0000-0000-000000000000.