EXT4-fs (loop4): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: writeback.
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BUG: KCSAN: data-race in data_push_tail / vsnprintf

write to 0xffffffff86ec76a2 of 1 bytes by task 31983 on cpu 1:
 vsnprintf+0xe2a/0xe80
 va_format lib/vsprintf.c:1681 [inline]
 pointer+0x6ef/0xb50 lib/vsprintf.c:2427
 vsnprintf+0x8d2/0xe80 lib/vsprintf.c:2800
 vscnprintf+0x3e/0x80 lib/vsprintf.c:2902
 printk_sprint kernel/printk/printk.c:2178 [inline]
 vprintk_store+0x5dd/0xad0 kernel/printk/printk.c:2292
 vprintk_emit+0xcc/0x430 kernel/printk/printk.c:2338
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2368
 vprintk+0x7f/0x90 kernel/printk/printk_safe.c:50
 _printk+0x76/0xa0 kernel/printk/printk.c:2378
 __ext4_msg+0x174/0x180 fs/ext4/super.c:937
 ext4_handle_error+0x4a3/0x4f0 fs/ext4/super.c:692
 __ext4_error_inode+0x1a5/0x3a0 fs/ext4/super.c:808
 ext4_free_branches+0x405/0x440 fs/ext4/indirect.c:1019
 ext4_ind_truncate+0x502/0x8b0 fs/ext4/indirect.c:1173
 ext4_truncate+0x762/0xaf0 fs/ext4/inode.c:4344
 ext4_process_orphan+0x115/0x1c0 fs/ext4/orphan.c:339
 ext4_orphan_cleanup+0x690/0xa00 fs/ext4/orphan.c:474
 __ext4_fill_super fs/ext4/super.c:5516 [inline]
 ext4_fill_super+0x4237/0x4500 fs/ext4/super.c:5644
 get_tree_bdev+0x2b4/0x3b0 fs/super.c:1282
 ext4_get_tree+0x18/0x20 fs/ext4/super.c:5675
 vfs_get_tree+0x49/0x190 fs/super.c:1489
 do_new_mount+0x200/0x650 fs/namespace.c:3145
 path_mount+0x4aa/0xb70 fs/namespace.c:3475
 do_mount fs/namespace.c:3488 [inline]
 __do_sys_mount fs/namespace.c:3697 [inline]
 __se_sys_mount+0x281/0x2d0 fs/namespace.c:3674
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3674
 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 0xffffffff86ec76a0 of 8 bytes by task 31978 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:590 [inline]
 data_push_tail+0x10f/0x440 kernel/printk/printk_ringbuffer.c:675
 data_alloc+0xbc/0x2b0 kernel/printk/printk_ringbuffer.c:1046
 prb_reserve+0x897/0xbd0 kernel/printk/printk_ringbuffer.c:1555
 vprintk_store+0x50b/0xad0 kernel/printk/printk.c:2282
 vprintk_emit+0xcc/0x430 kernel/printk/printk.c:2338
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2368
 vprintk+0x7f/0x90 kernel/printk/printk_safe.c:50
 _printk+0x76/0xa0 kernel/printk/printk.c:2378
 __ext4_msg+0x174/0x180 fs/ext4/super.c:937
 ext4_fill_super+0x910/0x4500 fs/ext4/super.c:5659
 get_tree_bdev+0x2b4/0x3b0 fs/super.c:1282
 ext4_get_tree+0x18/0x20 fs/ext4/super.c:5675
 vfs_get_tree+0x49/0x190 fs/super.c:1489
 do_new_mount+0x200/0x650 fs/namespace.c:3145
 path_mount+0x4aa/0xb70 fs/namespace.c:3475
 do_mount fs/namespace.c:3488 [inline]
 __do_sys_mount fs/namespace.c:3697 [inline]
 __se_sys_mount+0x281/0x2d0 fs/namespace.c:3674
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3674
 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

value changed: 0x000000010000d769 -> 0x00000001000a796c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 31978 Comm: syz-executor.4 Not tainted 6.2.0-rc1-syzkaller-00084-gc8451c141e07-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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