audit: type=1400 audit(2000000195.190:90402): avc: denied { perfmon } for pid=15631 comm="syz.2.9479" capability=38 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=capability2 permissive=1 audit: type=1400 audit(2000000195.190:90403): avc: denied { kernel } for pid=15631 comm="syz.2.9479" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=perf_event permissive=1 audit: type=1400 audit(2000000195.190:90404): avc: denied { perfmon } for pid=15631 comm="syz.2.9479" capability=38 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=capability2 permissive=1 ================================================================== BUG: KCSAN: data-race in _prb_read_valid / data_alloc write to 0xffffffff86c86b78 of 8 bytes by task 15637 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 set_capacity_and_notify+0x1d5/0x230 block/genhd.c:93 loop_set_size+0x2e/0x70 drivers/block/loop.c:220 loop_configure+0x826/0x9c0 drivers/block/loop.c:1075 lo_ioctl+0x1e1/0x1390 drivers/block/loop.c:1526 blkdev_ioctl+0x387/0x460 block/ioctl.c:797 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xce/0x140 fs/ioctl.c:583 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:583 x64_sys_call+0x1563/0x3020 arch/x86/include/generated/asm/syscalls_64.h:17 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 0xffffffff86c86b78 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 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2245 printk_get_next_message+0xea/0x550 kernel/printk/printk.c:3052 console_emit_next_record kernel/printk/printk.c:3137 [inline] console_flush_one_record kernel/printk/printk.c:3269 [inline] console_flush_all+0x2bc/0x6b0 kernel/printk/printk.c:3343 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0xa1/0x280 kernel/printk/printk.c:3413 vprintk_emit+0x3e4/0x600 kernel/printk/printk.c:2479 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+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 06/25/2026 ================================================================== audit: type=1400 audit(2000000195.190:90405): avc: denied { create } for pid=15634 comm="syz.0.9481" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 audit: type=1400 audit(2000000195.190:90406): avc: denied { module_request } for pid=15638 comm="syz.6.9482" kmod="netdev-syz_tun" scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:kernel_t tclass=system permissive=1 audit: type=1400 audit(2000000195.190:90407): avc: denied { create } for pid=15634 comm="syz.0.9481" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 kauditd_printk_skb: 1954 callbacks suppressed audit: type=1400 audit(2000000200.100:92362): avc: denied { search } for pid=15884 comm="sed" name="resolv.conf" dev="tmpfs" ino=487 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 audit: type=1400 audit(2000000200.100:92363): avc: denied { read } for pid=15884 comm="sed" name="eth0.dhcp" dev="tmpfs" ino=514 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1 audit: type=1400 audit(2000000200.100:92364): avc: denied { read open } for pid=15884 comm="sed" path="/run/dhcpcd/hook-state/resolv.conf/eth0.dhcp" dev="tmpfs" ino=514 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1 audit: type=1400 audit(2000000200.100:92365): avc: denied { getattr } for pid=15884 comm="sed" path="/run/dhcpcd/hook-state/resolv.conf/eth0.dhcp" dev="tmpfs" ino=514 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1 audit: type=1400 audit(2000000200.210:92366): avc: denied { search } for pid=15886 comm="dhcpcd-run-hook" name="/" dev="tmpfs" ino=1 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 audit: type=1400 audit(2000000200.210:92367): avc: denied { search } for pid=15886 comm="dhcpcd-run-hook" name="dhcpcd" dev="tmpfs" ino=482 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 audit: type=1400 audit(2000000200.210:92368): avc: denied { search } for pid=15886 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(2000000200.210:92369): avc: denied { search } for pid=15886 comm="dhcpcd-run-hook" name="resolv.conf" dev="tmpfs" ino=487 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 audit: type=1400 audit(2000000200.230:92370): avc: denied { search } for pid=15887 comm="sed" name="resolv.conf" dev="tmpfs" ino=487 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 audit: type=1400 audit(2000000200.230:92371): avc: denied { read } for pid=15887 comm="sed" name="eth0.dhcp" dev="tmpfs" ino=514 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1