__dump_stack+0x1d/0x30 lib/dump_stack.c:94 dump_stack_lvl+0x95/0xd0 lib/dump_stack.c:120 ================================================================== BUG: KCSAN: data-race in data_alloc / data_push_tail write to 0xffffffff895bdcd8 of 8 bytes by task 29 on cpu 0: data_alloc+0x240/0x380 kernel/printk/printk_ringbuffer.c:1116 prb_reserve+0x8e3/0xaf0 kernel/printk/printk_ringbuffer.c:1727 vprintk_store+0x54e/0x910 kernel/printk/printk.c:2354 vprintk_emit+0x1a4/0x610 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:588 [inline] kauditd_hold_skb+0x1b1/0x1c0 kernel/audit.c:623 kauditd_send_queue+0x275/0x2d0 kernel/audit.c:808 kauditd_thread+0x439/0x660 kernel/audit.c:932 kthread+0x223/0x270 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 0xffffffff895bdcd8 of 8 bytes by task 8433 on cpu 1: data_make_reusable kernel/printk/printk_ringbuffer.c:608 [inline] data_push_tail+0x104/0x440 kernel/printk/printk_ringbuffer.c:693 data_alloc+0x111/0x380 kernel/printk/printk_ringbuffer.c:1089 prb_reserve+0x8e3/0xaf0 kernel/printk/printk_ringbuffer.c:1727 vprintk_store+0x54e/0x910 kernel/printk/printk.c:2354 vprintk_emit+0x1a4/0x610 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 printk_stack_address arch/x86/kernel/dumpstack.c:70 [inline] __show_trace_log_lvl+0x460/0x560 arch/x86/kernel/dumpstack.c:282 __dump_stack+0x1d/0x30 lib/dump_stack.c:94 dump_stack_lvl+0x95/0xd0 lib/dump_stack.c:120 dump_stack+0x15/0x1b lib/dump_stack.c:129 fail_dump lib/fault-inject.c:73 [inline] should_fail_ex+0x262/0x280 lib/fault-inject.c:174 should_failslab+0x8c/0xb0 mm/failslab.c:46 slab_pre_alloc_hook mm/slub.c:4638 [inline] slab_alloc_node mm/slub.c:4974 [inline] __kmalloc_cache_noprof+0x7a/0x400 mm/slub.c:5559 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] ramfs_init_fs_context+0x31/0x80 fs/ramfs/inode.c:301 alloc_fs_context+0x490/0x570 fs/fs_context.c:295 fs_context_for_mount+0x22/0x30 fs/fs_context.c:309 __do_sys_fsopen fs/fsopen.c:142 [inline] __se_sys_fsopen+0xa0/0x1e0 fs/fsopen.c:120 __x64_sys_fsopen+0x31/0x40 fs/fsopen.c:120 x64_sys_call+0x1f0f/0x2550 arch/x86/include/generated/asm/syscalls_64.h:431 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x3fffffffffffe20e -> 0x3fffffffffffee22 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 8433 Comm: syz.2.1462 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 ================================================================== dump_stack+0x15/0x1b lib/dump_stack.c:129 fail_dump lib/fault-inject.c:73 [inline] should_fail_ex+0x262/0x280 lib/fault-inject.c:174 should_failslab+0x8c/0xb0 mm/failslab.c:46 slab_pre_alloc_hook mm/slub.c:4638 [inline] slab_alloc_node mm/slub.c:4974 [inline] __kmalloc_cache_noprof+0x7a/0x400 mm/slub.c:5559 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] ramfs_init_fs_context+0x31/0x80 fs/ramfs/inode.c:301 alloc_fs_context+0x490/0x570 fs/fs_context.c:295 fs_context_for_mount+0x22/0x30 fs/fs_context.c:309 __do_sys_fsopen fs/fsopen.c:142 [inline] __se_sys_fsopen+0xa0/0x1e0 fs/fsopen.c:120 __x64_sys_fsopen+0x31/0x40 fs/fsopen.c:120 x64_sys_call+0x1f0f/0x2550 arch/x86/include/generated/asm/syscalls_64.h:431 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f76623be159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7660e17028 EFLAGS: 00000246 ORIG_RAX: 00000000000001ae RAX: ffffffffffffffda RBX: 00007f7662645fa0 RCX: 00007f76623be159 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000180 RBP: 00007f766245506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7662646038 R14: 00007f7662645fa0 R15: 00007ffe4cb0afd8