EXT4-fs (loop2): unmounting filesystem 76b65be2-f6da-4727-8c75-0525a5b65a09.
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BUG: KCSAN: data-race in find_get_block_common / has_bh_in_lru

read-write to 0xffff888237d27768 of 8 bytes by task 15500 on cpu 1:
 bh_lru_install fs/buffer.c:1342 [inline]
 find_get_block_common+0x477/0x8a0 fs/buffer.c:1407
 bdev_getblk+0x4d/0x3f0 include/linux/gfp.h:-1
 __getblk include/linux/buffer_head.h:380 [inline]
 sb_getblk include/linux/buffer_head.h:386 [inline]
 __ext4_get_inode_loc+0x303/0x930 fs/ext4/inode.c:4787
 ext4_get_inode_loc fs/ext4/inode.c:4915 [inline]
 ext4_reserve_inode_write+0xd7/0x250 fs/ext4/inode.c:6235
 __ext4_mark_inode_dirty+0x8c/0x400 fs/ext4/inode.c:6413
 ext4_dirty_inode+0x92/0xc0 fs/ext4/inode.c:6450
 __mark_inode_dirty+0x16f/0x7d0 fs/fs-writeback.c:2609
 mark_inode_dirty_sync include/linux/fs.h:2217 [inline]
 dquot_free_space include/linux/quotaops.h:380 [inline]
 dquot_free_block include/linux/quotaops.h:390 [inline]
 ext4_mb_new_blocks+0x1616/0x1f50 fs/ext4/mballoc.c:6364
 ext4_new_meta_blocks+0x102/0x1f0 fs/ext4/balloc.c:750
 ext4_ext_grow_indepth fs/ext4/extents.c:1330 [inline]
 ext4_ext_create_new_leaf fs/ext4/extents.c:1434 [inline]
 ext4_ext_insert_extent+0x9ee/0x29b0 fs/ext4/extents.c:2120
 ext4_ext_map_blocks+0xe93/0x2fb0 fs/ext4/extents.c:4457
 ext4_map_create_blocks+0xce/0x3a0 fs/ext4/inode.c:616
 ext4_map_blocks+0x594/0x970 fs/ext4/inode.c:809
 ext4_getblk+0x128/0x530 fs/ext4/inode.c:977
 ext4_bread+0x28/0x110 fs/ext4/inode.c:1040
 ext4_quota_write+0x166/0x360 fs/ext4/super.c:7365
 write_blk+0x99/0x110 fs/quota/quota_tree.c:70
 do_insert_tree+0x94c/0xad0 fs/quota/quota_tree.c:407
 dq_insert_tree fs/quota/quota_tree.c:432 [inline]
 qtree_write_dquot+0x2cb/0x300 fs/quota/quota_tree.c:451
 v2_write_dquot+0xd9/0x130 fs/quota/quota_v2.c:372
 dquot_acquire+0x1c2/0x2b0 fs/quota/dquot.c:473
 ext4_acquire_dquot+0x15f/0x200 fs/ext4/super.c:6997
 dqget+0x527/0x8c0 fs/quota/dquot.c:980
 dquot_set_dqblk+0x2b/0x890 fs/quota/dquot.c:2823
 quota_setquota+0x3d0/0x400 fs/quota/quota.c:310
 do_quotactl+0x5ba/0x670 fs/quota/quota.c:802
 __do_sys_quotactl fs/quota/quota.c:961 [inline]
 __se_sys_quotactl+0x1f5/0x660 fs/quota/quota.c:917
 __x64_sys_quotactl+0x55/0x70 fs/quota/quota.c:917
 x64_sys_call+0x1a2a/0x3020 arch/x86/include/generated/asm/syscalls_64.h:180
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237d27768 of 8 bytes by task 13107 on cpu 0:
 has_bh_in_lru+0x54/0x1f0 fs/buffer.c:1548
 smp_call_function_many_cond+0x2c1/0xc30 kernel/smp.c:821
 on_each_cpu_cond_mask+0x3c/0x80 kernel/smp.c:1043
 on_each_cpu_cond include/linux/smp.h:106 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1557
 kill_bdev block/bdev.c:90 [inline]
 blkdev_flush_mapping+0x9a/0x1a0 block/bdev.c:728
 blkdev_put_whole block/bdev.c:735 [inline]
 bdev_release+0x2bf/0x3d0 block/bdev.c:1160
 blkdev_release+0x15/0x20 block/fops.c:705
 __fput+0x29b/0x650 fs/file_table.c:469
 ____fput+0x1c/0x30 fs/file_table.c:497
 task_work_run+0x130/0x1a0 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0x1f4/0x6f0 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
 do_syscall_64+0x249/0x370 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff88811afe95b0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 13107 Comm: syz-executor Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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