syzbot

Symlink component flag not implemented
Symlink component flag not implemented (128)
Symlink component flag not implemented (122)
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BUG: KCSAN: data-race in data_push_tail / string

write to 0xffffffff89393300 of 1 bytes by task 28 on cpu 0:
 string_nocheck lib/vsprintf.c:659 [inline]
 string+0x187/0x220 lib/vsprintf.c:737
 vsnprintf+0x532/0x860 lib/vsprintf.c:2948
 vscnprintf+0x41/0x90 lib/vsprintf.c:3013
 printk_sprint+0x30/0x2b0 kernel/printk/printk.c:2222
 vprintk_store+0x57b/0x910 kernel/printk/printk.c:2364
 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2455
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2504
 kauditd_printk_skb kernel/audit.c:587 [inline]
 kauditd_hold_skb+0x1b1/0x1c0 kernel/audit.c:622
 kauditd_send_queue+0x273/0x2c0 kernel/audit.c:807
 kauditd_thread+0x444/0x670 kernel/audit.c:931
 kthread+0x22a/0x280 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffffffff89393300 of 8 bytes by task 23290 on cpu 1:
 data_make_reusable kernel/printk/printk_ringbuffer.c:608 [inline]
 data_push_tail+0x100/0x470 kernel/printk/printk_ringbuffer.c:693
 data_alloc+0x11b/0x390 kernel/printk/printk_ringbuffer.c:1089
 prb_reserve+0x8d6/0xad0 kernel/printk/printk_ringbuffer.c:1727
 vprintk_store+0x54a/0x910 kernel/printk/printk.c:2354
 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2455
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2504
 get_symlink_chunk fs/isofs/rock.c:649 [inline]
 rock_ridge_symlink_read_folio+0x58f/0x8a0 fs/isofs/rock.c:771
 filemap_read_folio mm/filemap.c:2502 [inline]
 do_read_cache_folio+0x19b/0x600 mm/filemap.c:4107
 read_cache_folio+0x3c/0x50 mm/filemap.c:4139
 read_mapping_folio include/linux/pagemap.h:1017 [inline]
 __page_get_link+0x36/0x170 fs/namei.c:6316
 page_get_link+0x25/0x80 fs/namei.c:6346
 pick_link+0x4b1/0x8e0 fs/namei.c:-1
 step_into_slowpath+0x36a/0x4c0 fs/namei.c:2123
 step_into fs/namei.c:2148 [inline]
 open_last_lookups fs/namei.c:4646 [inline]
 path_openat+0x15d0/0x2050 fs/namei.c:4855
 do_file_open+0x16c/0x290 fs/namei.c:4887
 do_sys_openat2+0x94/0x130 fs/open.c:1364
 do_sys_open fs/open.c:1370 [inline]
 __do_sys_openat fs/open.c:1386 [inline]
 __se_sys_openat fs/open.c:1381 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1381
 x64_sys_call+0x1e39/0x3020 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x3ffffffffffffe4e -> 0x696e656420203a63

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 23290 Comm: syz.2.5453 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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