udevd[23535]: inotify_add_watch(7, /dev/loop1p4, 10) failed: No such file or directory
==================================================================
BUG: KCSAN: data-race in data_push_tail / string

write to 0xffffffff86ecbd30 of 1 bytes by task 23531 on cpu 1:
 string_nocheck lib/vsprintf.c:650 [inline]
 string+0x16c/0x200 lib/vsprintf.c:728
 vsnprintf+0xa09/0xe20 lib/vsprintf.c:2819
 vscnprintf+0x42/0x80 lib/vsprintf.c:2925
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2124
 vprintk_store+0x56f/0x800 kernel/printk/printk.c:2238
 vprintk_emit+0xd0/0x5d0 kernel/printk/printk.c:2284
 devkmsg_emit+0x82/0xb0 kernel/printk/printk.c:716
 devkmsg_write+0x247/0x290 kernel/printk/printk.c:779
 do_iter_write+0x4ad/0x770 fs/read_write.c:860
 vfs_writev+0x1a8/0x320 fs/read_write.c:933
 do_writev+0xf8/0x220 fs/read_write.c:976
 __do_sys_writev fs/read_write.c:1049 [inline]
 __se_sys_writev fs/read_write.c:1046 [inline]
 __x64_sys_writev+0x45/0x50 fs/read_write.c:1046
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffffffff86ecbd30 of 8 bytes by task 23535 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:590 [inline]
 data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:675
 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1046
 prb_reserve+0x893/0xbc0 kernel/printk/printk_ringbuffer.c:1555
 vprintk_store+0x53e/0x800 kernel/printk/printk.c:2228
 vprintk_emit+0xd0/0x5d0 kernel/printk/printk.c:2284
 devkmsg_emit+0x82/0xb0 kernel/printk/printk.c:716
 devkmsg_write+0x247/0x290 kernel/printk/printk.c:779
 do_iter_write+0x4ad/0x770 fs/read_write.c:860
 vfs_writev+0x1a8/0x320 fs/read_write.c:933
 do_writev+0xf8/0x220 fs/read_write.c:976
 __do_sys_writev fs/read_write.c:1049 [inline]
 __se_sys_writev fs/read_write.c:1046 [inline]
 __x64_sys_writev+0x45/0x50 fs/read_write.c:1046
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00000001000015e4 -> 0x33325b6476656475

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 23535 Comm: udevd Tainted: G        W          6.7.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
==================================================================
udevd[23535]: inotify_add_watch(7, /dev/loop1p4, 10) failed: No such file or directory
I/O error, dev loop1, sector 1024 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
I/O error, dev loop1, sector 1024 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
buffer_io_error: 2 callbacks suppressed
Buffer I/O error on dev loop1p4, logical block 0, async page read
I/O error, dev loop1, sector 1024 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop1p4, logical block 0, async page read
I/O error, dev loop1, sector 1024 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop1p4, logical block 0, async page read
I/O error, dev loop1, sector 1024 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop1p4, logical block 0, async page read
I/O error, dev loop1, sector 1024 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop1p4, logical block 0, async page read
udevd[23535]: inotify_add_watch(7, /dev/loop1p4, 10) failed: No such file or directory
udevd[23535]: inotify_add_watch(7, /dev/loop1p4, 10) failed: No such file or directory
udevd[23535]: inotify_add_watch(7, /dev/loop1p4, 10) failed: No such file or directory
udevd[23535]: inotify_add_watch(7, /dev/loop1p4, 10) failed: No such file or directory
udevd[23535]: inotify_add_watch(7, /dev/loop1p4, 10) failed: No such file or directory
udevd[23535]: inotify_add_watch(7, /dev/loop1p4, 10) failed: No such file or directory