EXT4-fs error (device loop0): ext4_ext_check_inode:460: inode #3: comm syz-executor.0: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0)
EXT4-fs error (device loop0): ext4_quota_enable:6315: comm syz-executor.0: Bad quota inode # 3
==================================================================
BUG: KCSAN: data-race in data_push_tail / number

write to 0xffffffff84150189 of 1 bytes by task 7382 on cpu 1:
 number+0x846/0xb60 lib/vsprintf.c:556
 vsnprintf+0xb6d/0xed0 lib/vsprintf.c:2863
 va_format lib/vsprintf.c:1694 [inline]
 pointer+0x48c/0x830 lib/vsprintf.c:2427
 vsnprintf+0x8a1/0xed0 lib/vsprintf.c:2801
 vscnprintf+0x29/0x80 lib/vsprintf.c:2900
 printk_sprint kernel/printk/printk.c:2075 [inline]
 vprintk_store+0x606/0xb80 kernel/printk/printk.c:2185
 vprintk_emit+0xac/0x390 kernel/printk/printk.c:2228
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2255
 vprintk+0x7f/0x90 kernel/printk/printk_safe.c:50
 _printk+0x76/0x97 kernel/printk/printk.c:2265
 __ext4_warning+0x130/0x140 fs/ext4/super.c:937
 ext4_enable_quotas+0x30b/0x380 fs/ext4/super.c:6352
 ext4_fill_super+0x70be/0x7830 fs/ext4/super.c:4943
 mount_bdev+0x1e8/0x290 fs/super.c:1368
 ext4_mount+0x2d/0x40 fs/ext4/super.c:6515
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:610
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498
 do_new_mount fs/namespace.c:2988 [inline]
 path_mount+0x11ec/0x1d20 fs/namespace.c:3318
 do_mount fs/namespace.c:3331 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount+0x24b/0x2f0 fs/namespace.c:3516
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3516
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff84150188 of 8 bytes by task 7359 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:587 [inline]
 data_push_tail+0x138/0x470 kernel/printk/printk_ringbuffer.c:672
 data_alloc+0xbc/0x2b0 kernel/printk/printk_ringbuffer.c:1043
 prb_reserve+0x920/0xbf0 kernel/printk/printk_ringbuffer.c:1549
 vprintk_store+0x53a/0xb80 kernel/printk/printk.c:2175
 vprintk_emit+0xac/0x390 kernel/printk/printk.c:2228
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2255
 vprintk+0x7f/0x90 kernel/printk/printk_safe.c:50
 _printk+0x76/0x97 kernel/printk/printk.c:2265
 __ext4_error+0x18a/0x220 fs/ext4/super.c:757
 ext4_quota_enable fs/ext4/super.c:6315 [inline]
 ext4_enable_quotas+0x221/0x380 fs/ext4/super.c:6348
 ext4_fill_super+0x70be/0x7830 fs/ext4/super.c:4943
 mount_bdev+0x1e8/0x290 fs/super.c:1368
 ext4_mount+0x2d/0x40 fs/ext4/super.c:6515
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:610
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498
 do_new_mount fs/namespace.c:2988 [inline]
 path_mount+0x11ec/0x1d20 fs/namespace.c:3318
 do_mount fs/namespace.c:3331 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount+0x24b/0x2f0 fs/namespace.c:3516
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3516
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000100007e37 -> 0x312d3d727265202c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7359 Comm: syz-executor.0 Not tainted 5.15.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
EXT4-fs warning (device loop0): ext4_enable_quotas:6355: Failed to enable quota tracking (type=0, err=-117). Please run e2fsck to fix.
EXT4-fs (loop0): mount failed