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

write to 0xffffffff88b9f060 of 1 bytes by task 29 on cpu 1:
 string_nocheck lib/vsprintf.c:650 [inline]
 string+0x16c/0x210 lib/vsprintf.c:728
 vsnprintf+0xa09/0xe30 lib/vsprintf.c:2803
 vscnprintf+0x42/0x90 lib/vsprintf.c:2909
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2197
 vprintk_store+0x570/0x810 kernel/printk/printk.c:2311
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2383
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2422
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:68
 _printk+0x7a/0xa0 kernel/printk/printk.c:2432
 kauditd_printk_skb kernel/audit.c:546 [inline]
 kauditd_hold_skb+0x1a3/0x1b0 kernel/audit.c:581
 kauditd_send_queue+0x288/0x2e0 kernel/audit.c:766
 kauditd_thread+0x42a/0x650 kernel/audit.c:890
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffffffff88b9f060 of 8 bytes by task 7884 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_realloc kernel/printk/printk_ringbuffer.c:1143 [inline]
 prb_reserve_in_last+0x773/0xc10 kernel/printk/printk_ringbuffer.c:1440
 vprintk_store+0x45b/0x810 kernel/printk/printk.c:2278
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2383
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2422
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:68
 _printk+0x7a/0xa0 kernel/printk/printk.c:2432
 __ext4_grp_locked_error+0x5b0/0x7b0 fs/ext4/super.c:1064
 ext4_mb_generate_buddy+0x247/0x2d0 fs/ext4/mballoc.c:1217
 ext4_mb_init_cache+0x848/0xbc0 fs/ext4/mballoc.c:1406
 ext4_mb_init_group+0x210/0x3b0 fs/ext4/mballoc.c:1543
 ext4_mb_good_group_nolock fs/ext4/mballoc.c:2704 [inline]
 ext4_mb_regular_allocator+0xb1f/0x2390 fs/ext4/mballoc.c:2903
 ext4_mb_new_blocks+0x801/0x2020 fs/ext4/mballoc.c:6217
 ext4_ext_map_blocks+0x1008/0x35c0 fs/ext4/extents.c:4379
 ext4_map_create_blocks fs/ext4/inode.c:516 [inline]
 ext4_map_blocks+0x592/0xcf0 fs/ext4/inode.c:702
 ext4_convert_inline_data_nolock+0x2b2/0x780 fs/ext4/inline.c:1211
 ext4_convert_inline_data+0x2c2/0x370 fs/ext4/inline.c:2061
 ext4_page_mkwrite+0x1b3/0xb70 fs/ext4/inode.c:6106
 do_page_mkwrite mm/memory.c:3162 [inline]
 wp_page_shared mm/memory.c:3563 [inline]
 do_wp_page+0xca4/0x2340 mm/memory.c:3713
 handle_pte_fault mm/memory.c:5767 [inline]
 __handle_mm_fault mm/memory.c:5894 [inline]
 handle_mm_fault+0xc47/0x2a80 mm/memory.c:6062
 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x296/0x650 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
 rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:57
 copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline]
 _inline_copy_to_user include/linux/uaccess.h:188 [inline]
 _copy_to_user+0x77/0xa0 lib/usercopy.c:26
 copy_to_user include/linux/uaccess.h:216 [inline]
 put_timespec64+0x64/0xb0 kernel/time/time.c:910
 __do_sys_clock_gettime kernel/time/posix-timers.c:1159 [inline]
 __se_sys_clock_gettime kernel/time/posix-timers.c:1147 [inline]
 __x64_sys_clock_gettime+0x138/0x180 kernel/time/posix-timers.c:1147
 x64_sys_call+0x27b5/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:229
 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: 0x00000000ffffe5bb -> 0x3d64696720303d64

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 7884 Comm: syz.1.1318 Not tainted 6.12.0-rc1-syzkaller-00330-gfc20a3e57247 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
==================================================================
block bitmap and bg descriptor inconsistent: 25 vs 150994969 free clusters
EXT4-fs (loop1): Remounting filesystem read-only
EXT4-fs (loop1): error restoring inline_data for inode -- potential data loss! (inode 18, error -5)
SELinux: inode_doinit_use_xattr:  getxattr returned 5 for dev=loop1 ino=12