syzbot

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BUG: KCSAN: data-race in __find_get_block / has_bh_in_lru

write to 0xffff888237d286c0 of 8 bytes by task 4092 on cpu 1:
 bh_lru_install fs/buffer.c:1250 [inline]
 __find_get_block+0x254/0x6c0 fs/buffer.c:1309
 sb_find_get_block include/linux/buffer_head.h:369 [inline]
 ext4_free_blocks+0x6d4/0x890 fs/ext4/mballoc.c:6168
 ext4_remove_blocks+0x724/0x950 fs/ext4/extents.c:2545
 ext4_ext_rm_leaf+0x657/0xe40 fs/ext4/extents.c:2710
 ext4_ext_remove_space+0x86b/0x1480 fs/ext4/extents.c:2958
 ext4_ext_truncate+0x11c/0x1a0 fs/ext4/extents.c:4416
 ext4_truncate+0x787/0xaf0 fs/ext4/inode.c:4342
 ext4_evict_inode+0xadd/0xf10 fs/ext4/inode.c:286
 evict+0x1aa/0x410 fs/inode.c:664
 iput_final fs/inode.c:1747 [inline]
 iput+0x3f9/0x580 fs/inode.c:1773
 d_delete_notify include/linux/fsnotify.h:261 [inline]
 vfs_rmdir+0x270/0x2f0 fs/namei.c:4134
 do_rmdir+0x176/0x300 fs/namei.c:4182
 __do_sys_unlinkat fs/namei.c:4362 [inline]
 __se_sys_unlinkat fs/namei.c:4356 [inline]
 __x64_sys_unlinkat+0xa0/0xb0 fs/namei.c:4356
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888237d286c0 of 8 bytes by task 3167 on cpu 0:
 has_bh_in_lru+0x4e/0x1c0 fs/buffer.c:1403
 cpu_needs_drain mm/swap.c:836 [inline]
 __lru_add_drain_all+0x263/0x3c0 mm/swap.c:923
 lru_add_drain_all+0xc/0x10 mm/swap.c:939
 invalidate_bdev+0x56/0x80 block/bdev.c:86
 ext4_put_super+0x510/0x810 fs/ext4/super.c:1273
 generic_shutdown_super+0xd5/0x240 fs/super.c:492
 kill_block_super+0x4a/0x90 fs/super.c:1386
 deactivate_locked_super+0x6a/0xb0 fs/super.c:332
 deactivate_super+0x85/0x90 fs/super.c:363
 cleanup_mnt+0x267/0x2d0 fs/namespace.c:1291
 __cleanup_mnt+0x15/0x20 fs/namespace.c:1298
 task_work_run+0xde/0x110 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x124/0x130 kernel/entry/common.c:171
 exit_to_user_mode_prepare kernel/entry/common.c:203 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:296
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000000 -> 0xffff88810a967f70

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3167 Comm: syz-executor.4 Tainted: G        W          6.2.0-rc6-syzkaller-00003-g22b8077d0fce-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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