EXT4-fs error (device loop9): __ext4_get_inode_loc_noinmem:4955: inode #2: block 5: comm kworker/u8:11: unable to read itable block
Buffer I/O error on dev loop9, logical block 1, lost sync page write
==================================================================
BUG: KCSAN: data-race in data_push_tail / vsnprintf

write to 0xffffffff88e7bde0 of 24 bytes by task 15101 on cpu 1:
 vsnprintf+0x2ce/0x890 lib/vsprintf.c:2878
 vscnprintf+0x41/0x90 lib/vsprintf.c:2991
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2189
 vprintk_store+0x599/0x860 kernel/printk/printk.c:2309
 vprintk_emit+0x10d/0x580 kernel/printk/printk.c:2399
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2438
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2448
 __ext4_error+0x248/0x320 fs/ext4/super.c:822
 __ext4_get_inode_loc+0x374/0x930 fs/ext4/inode.c:4831
 ext4_get_inode_loc fs/ext4/inode.c:4965 [inline]
 ext4_reserve_inode_write+0xd7/0x250 fs/ext4/inode.c:6302
 ext4_orphan_del+0x185/0x710 fs/ext4/orphan.c:246
 ext4_truncate+0x89f/0xae0 fs/ext4/inode.c:4634
 ext4_process_orphan+0x110/0x1c0 fs/ext4/orphan.c:335
 ext4_orphan_cleanup+0x6a8/0xa00 fs/ext4/orphan.c:470
 __ext4_fill_super fs/ext4/super.c:5617 [inline]
 ext4_fill_super+0x3483/0x3810 fs/ext4/super.c:5736
 get_tree_bdev_flags+0x291/0x300 fs/super.c:1691
 get_tree_bdev+0x1f/0x30 fs/super.c:1714
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5768
 vfs_get_tree+0x57/0x1d0 fs/super.c:1751
 fc_mount fs/namespace.c:1208 [inline]
 do_new_mount_fc fs/namespace.c:3651 [inline]
 do_new_mount+0x24d/0x660 fs/namespace.c:3727
 path_mount+0x4a5/0xb70 fs/namespace.c:4037
 do_mount fs/namespace.c:4050 [inline]
 __do_sys_mount fs/namespace.c:4238 [inline]
 __se_sys_mount+0x28c/0x2e0 fs/namespace.c:4215
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4215
 x64_sys_call+0x2b51/0x3000 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff88e7bde8 of 8 bytes by task 5042 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:591 [inline]
 data_push_tail+0xfd/0x420 kernel/printk/printk_ringbuffer.c:676
 data_alloc+0xfb/0x2e0 kernel/printk/printk_ringbuffer.c:1061
 prb_reserve+0x807/0xaf0 kernel/printk/printk_ringbuffer.c:1685
 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2299
 vprintk_emit+0x10d/0x580 kernel/printk/printk.c:2399
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2438
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2448
 buffer_io_error fs/buffer.c:130 [inline]
 end_buffer_write_sync+0xf5/0x100 fs/buffer.c:170
 end_bio_bh_io_sync+0x79/0xa0 fs/buffer.c:2776
 bio_endio+0x37e/0x420 block/bio.c:1672
 submit_bio_noacct+0x76f/0x9a0 block/blk-core.c:886
 submit_bio+0x2a6/0x2c0 block/blk-core.c:921
 submit_bh_wbc+0x2e0/0x320 fs/buffer.c:2824
 submit_bh+0x1e/0x30 fs/buffer.c:2829
 ext4_commit_super+0x1ac/0x280 fs/ext4/super.c:6234
 ext4_handle_error+0x451/0x550 fs/ext4/super.c:718
 __ext4_error_inode+0x1e3/0x3f0 fs/ext4/super.c:861
 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4954 [inline]
 ext4_write_inode+0x218/0x3c0 fs/ext4/inode.c:5733
 write_inode fs/fs-writeback.c:1564 [inline]
 __writeback_single_inode+0x31c/0x7c0 fs/fs-writeback.c:1784
 writeback_sb_inodes+0x48f/0xa30 fs/fs-writeback.c:2015
 wb_writeback+0x252/0x5c0 fs/fs-writeback.c:2195
 wb_do_writeback fs/fs-writeback.c:2342 [inline]
 wb_workfn+0x194/0x910 fs/fs-writeback.c:2382
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3346
 worker_thread+0x582/0x770 kernel/workqueue.c:3427
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x122/0x1b0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x00000001000001cd -> 0x642820726f727265

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 5042 Comm: kworker/u8:11 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: writeback wb_workfn (flush-7:9)
==================================================================
EXT4-fs (loop9): I/O error while writing superblock