==================================================================
BUG: KCSAN: data-race in data_push_tail / vsnprintf

write to 0xffffffff86eccf80 of 1 bytes by task 12533 on cpu 0:
 vsnprintf+0xe2a/0xe80
 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_orphan_get+0x30d/0x3e0 fs/ext4/ialloc.c:1424
 ext4_orphan_cleanup+0x5d9/0xa00 fs/ext4/orphan.c:467
 __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 0xffffffff86eccf80 of 8 bytes by task 12539 on cpu 1:
 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_std_error+0x30a/0x370 fs/ext4/super.c:912
 ext4_mb_clear_bb+0x1254/0x12a0 fs/ext4/mballoc.c:6071
 ext4_free_blocks+0x77d/0x890 fs/ext4/mballoc.c:6173
 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_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

value changed: 0x0000000100009ab5 -> 0x0000000100009a00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 12539 Comm: syz-executor.1 Not tainted 6.2.0-rc4-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
==================================================================
EXT4-fs (loop1): 1 truncate cleaned up
EXT4-fs (loop1): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: none.
syz-executor.1 (12539) used greatest stack depth: 9360 bytes left