EXT4-fs error (device loop9): ext4_do_update_inode:5153: inode #13: comm syz.9.2593: corrupted inode contents
EXT4-fs error (device loop9): ext4_dirty_inode:6041: inode #13: comm syz.9.2593: mark_inode_dirty error
EXT4-fs error (device loop9): ext4_do_update_inode:5153: inode #13: comm syz.9.2593: corrupted inode contents
EXT4-fs error (device loop9): __ext4_ext_dirty:207: inode #13: comm syz.9.2593: mark_inode_dirty error
==================================================================
BUG: KCSAN: data-race in data_push_tail / string

write to 0xffffffff88b98034 of 1 bytes by task 13497 on cpu 1:
 string_nocheck lib/vsprintf.c:650 [inline]
 string+0x16c/0x210 lib/vsprintf.c:728
 vsnprintf+0xa09/0xe30 lib/vsprintf.c:2848
 va_format lib/vsprintf.c:1718 [inline]
 pointer+0x8a1/0xd20 lib/vsprintf.c:2479
 vsnprintf+0x861/0xe30 lib/vsprintf.c:2852
 vscnprintf+0x42/0x90 lib/vsprintf.c:2954
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2216
 vprintk_store+0x589/0x870 kernel/printk/printk.c:2336
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2408
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2447
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:86
 _printk+0x7a/0xa0 kernel/printk/printk.c:2457
 __ext4_msg+0x18e/0x1a0 fs/ext4/super.c:998
 ext4_fill_super+0x980/0x3a10 fs/ext4/super.c:5748
 get_tree_bdev_flags+0x29f/0x310 fs/super.c:1636
 get_tree_bdev+0x1f/0x30 fs/super.c:1659
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5765
 vfs_get_tree+0x56/0x1e0 fs/super.c:1814
 do_new_mount+0x227/0x690 fs/namespace.c:3507
 path_mount+0x49b/0xb30 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x27c/0x2d0 fs/namespace.c:4034
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4034
 x64_sys_call+0x2c84/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff88b98030 of 8 bytes by task 13489 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:594 [inline]
 data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:679
 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1054
 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x558/0x870 kernel/printk/printk.c:2326
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2408
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2447
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:86
 _printk+0x7a/0xa0 kernel/printk/printk.c:2457
 __ext4_error_inode+0x2da/0x400 fs/ext4/super.c:861
 __ext4_mark_inode_dirty+0xbe/0x440 fs/ext4/inode.c:6015
 __ext4_ext_dirty+0xbf/0x130 fs/ext4/extents.c:207
 ext4_ext_rm_leaf fs/ext4/extents.c:2748 [inline]
 ext4_ext_remove_space+0x1340/0x2940 fs/ext4/extents.c:2961
 ext4_ext_truncate+0xc4/0x150 fs/ext4/extents.c:4466
 ext4_truncate+0x776/0xb10 fs/ext4/inode.c:4217
 ext4_process_orphan+0x113/0x1c0 fs/ext4/orphan.c:339
 ext4_orphan_cleanup+0x696/0x9e0 fs/ext4/orphan.c:474
 __ext4_fill_super fs/ext4/super.c:5610 [inline]
 ext4_fill_super+0x36bb/0x3a10 fs/ext4/super.c:5733
 get_tree_bdev_flags+0x29f/0x310 fs/super.c:1636
 get_tree_bdev+0x1f/0x30 fs/super.c:1659
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5765
 vfs_get_tree+0x56/0x1e0 fs/super.c:1814
 do_new_mount+0x227/0x690 fs/namespace.c:3507
 path_mount+0x49b/0xb30 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x27c/0x2d0 fs/namespace.c:4034
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4034
 x64_sys_call+0x2c84/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000fffffb1c -> 0x626574697277203a

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 13489 Comm: syz.9.2593 Not tainted 6.13.0-rc4-syzkaller-00078-g059dd502b263 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
==================================================================
EXT4-fs error (device loop9): ext4_do_update_inode:5153: inode #13: comm syz.9.2593: corrupted inode contents
EXT4-fs error (device loop9) in ext4_orphan_del:305: Corrupt filesystem
EXT4-fs error (device loop9): ext4_do_update_inode:5153: inode #13: comm syz.9.2593: corrupted inode contents
EXT4-fs error (device loop9): ext4_truncate:4240: inode #13: comm syz.9.2593: mark_inode_dirty error
EXT4-fs error (device loop9) in ext4_process_orphan:347: Corrupt filesystem
EXT4-fs (loop9): 1 truncate cleaned up
EXT4-fs (loop9): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.