BUG: KCSAN: data-race in _prb_read_valid / data_alloc write to 0xffffffff86c77038 of 8 bytes by task 1111 on cpu 1: data_alloc+0x2fc/0x380 kernel/printk/printk_ringbuffer.c:1129 prb_reserve+0x8e3/0xaf0 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 fail_dump lib/fault-inject.c:66 [inline] should_fail_ex+0x246/0x270 lib/fault-inject.c:174 should_fail+0xb/0x20 lib/fault-inject.c:184 should_fail_usercopy+0x1a/0x20 lib/fault-inject-usercopy.c:35 _inline_copy_to_user include/linux/uaccess.h:198 [inline] _copy_to_user+0x20/0xa0 lib/usercopy.c:24 copy_to_user include/linux/uaccess.h:230 [inline] simple_read_from_buffer+0xb5/0x130 fs/libfs.c:1155 proc_fail_nth_read+0x10e/0x150 fs/proc/base.c:1469 vfs_read+0x18e/0x7c0 fs/read_write.c:572 ksys_read+0xdc/0x1a0 fs/read_write.c:716 __do_sys_read fs/read_write.c:725 [inline] __se_sys_read fs/read_write.c:723 [inline] __x64_sys_read+0x40/0x50 fs/read_write.c:723 x64_sys_call+0x2886/0x3020 arch/x86/include/generated/asm/syscalls_64.h:1 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff86c77038 of 16 bytes by task 28 on cpu 0: desc_read kernel/printk/printk_ringbuffer.c:496 [inline] desc_read_finalized_seq kernel/printk/printk_ringbuffer.c:1934 [inline] prb_read kernel/printk/printk_ringbuffer.c:1982 [inline] _prb_read_valid+0x183/0x930 kernel/printk/printk_ringbuffer.c:2173 desc_update_last_finalized+0x8f/0x170 kernel/printk/printk_ringbuffer.c:1573 prb_final_commit+0x111/0x150 kernel/printk/printk_ringbuffer.c:1842 vprintk_store+0x88b/0x910 kernel/printk/printk.c:2381 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+0x275/0x2d0 kernel/audit.c:807 kauditd_thread+0x439/0x660 kernel/audit.c:931 kthread+0x221/0x270 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 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 28 Comm: kauditd Tainted: G W syzkaller #0 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 ================================================================== audit: type=1400 audit(1782684391.731:4705): avc: denied { write } for pid=1123 comm="dhcpcd-run-hook" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 audit: type=1400 audit(1782684391.731:4706): avc: denied { write } for pid=1137 comm="rm" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 audit: type=1400 audit(1782684391.831:4707): avc: denied { write } for pid=1140 comm="dhcpcd-run-hook" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 kauditd_printk_skb: 79 callbacks suppressed audit: type=1400 audit(1782684395.181:4787): avc: denied { write } for pid=1727 comm="dhcpcd-run-hook" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 audit: type=1400 audit(1782684395.201:4788): avc: denied { write } for pid=1738 comm="rm" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 audit: type=1400 audit(1782684395.281:4789): avc: denied { write } for pid=1741 comm="dhcpcd-run-hook" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 audit: type=1400 audit(1782684395.281:4790): avc: denied { write } for pid=1752 comm="rm" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 audit: type=1400 audit(1782684395.371:4791): avc: denied { write } for pid=1755 comm="dhcpcd-run-hook" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 audit: type=1400 audit(1782684395.371:4792): avc: denied { write } for pid=1766 comm="rm" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 audit: type=1400 audit(1782684395.471:4793): avc: denied { write } for pid=1769 comm="dhcpcd-run-hook" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 audit: type=1400 audit(1782684395.501:4794): avc: denied { write } for pid=1780 comm="rm" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 audit: type=1400 audit(1782684395.551:4795): avc: denied { recv } for pid=1782 comm="dhcpcd" src=68 daddr=255.255.255.255 dest=67 netif=veth1_to_bond scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:unlabeled_t tclass=peer permissive=1 audit: type=1400 audit(1782684395.841:4796): avc: denied { write } for pid=1785 comm="dhcpcd-run-hook" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1