./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor4258324320 <...> syzkaller syzkaller login: [ 24.343893][ T36] kauditd_printk_skb: 46 callbacks suppressed [ 24.343908][ T36] audit: type=1400 audit(1750628140.440:59): avc: denied { transition } for pid=274 comm="sshd-session" path="/bin/sh" dev="sda1" ino=90 scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 24.351395][ T36] audit: type=1400 audit(1750628140.440:60): avc: denied { noatsecure } for pid=274 comm="sshd-session" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 24.354370][ T36] audit: type=1400 audit(1750628140.440:61): avc: denied { write } for pid=274 comm="sh" path="pipe:[1710]" dev="pipefs" ino=1710 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 24.359316][ T36] audit: type=1400 audit(1750628140.440:62): avc: denied { rlimitinh } for pid=274 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 24.367017][ T36] audit: type=1400 audit(1750628140.440:63): avc: denied { siginh } for pid=274 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 Warning: Permanently added '10.128.1.151' (ED25519) to the list of known hosts. execve("./syz-executor4258324320", ["./syz-executor4258324320"], 0x7fff8c0cd0f0 /* 10 vars */) = 0 brk(NULL) = 0x55557c16f000 brk(0x55557c16fd40) = 0x55557c16fd40 arch_prctl(ARCH_SET_FS, 0x55557c16f3c0) = 0 set_tid_address(0x55557c16f690) = 297 set_robust_list(0x55557c16f6a0, 24) = 0 rseq(0x55557c16fce0, 0x20, 0, 0x53053053) = -1 ENOSYS (Function not implemented) prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor4258324320", 4096) = 28 getrandom("\x19\xd9\xe5\x85\xf0\x1a\xd2\x6e", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55557c16fd40 brk(0x55557c190d40) = 0x55557c190d40 brk(0x55557c191000) = 0x55557c191000 mprotect(0x7fbe5e0ee000, 16384, PROT_READ) = 0 mmap(0x1ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffffffff000 mmap(0x200000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200000000000 mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 298 attached , child_tidptr=0x55557c16f690) = 298 [pid 298] set_robust_list(0x55557c16f6a0, 24) = 0 [pid 298] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 298] setpgid(0, 0) = 0 [pid 298] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 298] write(3, "1000", 4) = 4 [pid 298] close(3) = 0 executing program [pid 298] write(1, "executing program\n", 18) = 18 [pid 298] futex(0x7fbe5e0f43ec, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 298] rt_sigaction(SIGRT_1, {sa_handler=0x7fbe5e0906e0, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7fbe5e081d60}, NULL, 8) = 0 [pid 298] rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0 [pid 298] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7fbe5dff7000 [pid 298] mprotect(0x7fbe5dff8000, 131072, PROT_READ|PROT_WRITE) = 0 [pid 298] rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 [pid 298] clone3({flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, child_tid=0x7fbe5e017990, parent_tid=0x7fbe5e017990, exit_signal=0, stack=0x7fbe5dff7000, stack_size=0x20300, tls=0x7fbe5e0176c0}./strace-static-x86_64: Process 299 attached [pid 299] set_robust_list(0x7fbe5e0179a0, 24) = 0 [pid 299] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 [pid 299] futex(0x7fbe5e0f43e8, FUTEX_WAIT_PRIVATE, 0, NULL [pid 298] <... clone3 resumed> => {parent_tid=[299]}, 88) = 299 [pid 298] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 [pid 298] futex(0x7fbe5e0f43e8, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 299] <... futex resumed>) = 0 [pid 299] mknodat(AT_FDCWD, "./file0", 000 [pid 298] futex(0x7fbe5e0f43ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 299] <... mknodat resumed>) = 0 [pid 299] futex(0x7fbe5e0f43ec, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 298] <... futex resumed>) = 0 [pid 299] futex(0x7fbe5e0f43e8, FUTEX_WAIT_PRIVATE, 0, NULL [pid 298] futex(0x7fbe5e0f43e8, FUTEX_WAKE_PRIVATE, 1000000 [pid 299] <... futex resumed>) = -1 EAGAIN (Resource temporarily unavailable) [pid 298] <... futex resumed>) = 0 [pid 299] pipe2( [pid 298] futex(0x7fbe5e0f43ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 299] <... pipe2 resumed>[3, 4], 0) = 0 [pid 299] futex(0x7fbe5e0f43ec, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 298] <... futex resumed>) = 0 [pid 298] futex(0x7fbe5e0f43e8, FUTEX_WAKE_PRIVATE, 1000000 [pid 299] setsockopt(-1, SOL_XDP, XDP_TX_RING, [2048], 4) = -1 EBADF (Bad file descriptor) [pid 298] <... futex resumed>) = 0 [pid 299] futex(0x7fbe5e0f43ec, FUTEX_WAKE_PRIVATE, 1000000 [pid 298] futex(0x7fbe5e0f43ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable) [pid 298] futex(0x7fbe5e0f43e8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 298] futex(0x7fbe5e0f43ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 299] <... futex resumed>) = 0 [pid 299] write(4, "\x15\x00\x00\x00\x65\xff\xff\x01\x7f\x00\x0e\x08\x00\x39\x50\x32\x30\x30\x30\x00\x00", 21) = 21 [pid 299] futex(0x7fbe5e0f43ec, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 298] <... futex resumed>) = 0 [pid 298] futex(0x7fbe5e0f43e8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 299] dup(4 [pid 298] futex(0x7fbe5e0f43ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 299] <... dup resumed>) = 5 [pid 299] futex(0x7fbe5e0f43ec, FUTEX_WAKE_PRIVATE, 1000000 [pid 298] <... futex resumed>) = -1 EAGAIN (Resource temporarily unavailable) [pid 299] <... futex resumed>) = 0 [pid 298] futex(0x7fbe5e0f43e8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 298] futex(0x7fbe5e0f43ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 299] write(5, "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xb9\x03\x00\x00\x00\x00\x00\x00", 24) = 24 [pid 299] futex(0x7fbe5e0f43ec, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 298] <... futex resumed>) = 0 [pid 299] futex(0x7fbe5e0f43e8, FUTEX_WAIT_PRIVATE, 0, NULL [pid 298] futex(0x7fbe5e0f43e8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 298] futex(0x7fbe5e0f43ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 299] <... futex resumed>) = -1 EAGAIN (Resource temporarily unavailable) [pid 299] write(5, "\x00\x08\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 176) = 176 [pid 299] futex(0x7fbe5e0f43ec, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 298] <... futex resumed>) = 0 [pid 299] futex(0x7fbe5e0f43e8, FUTEX_WAIT_PRIVATE, 0, NULL [pid 298] futex(0x7fbe5e0f43e8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 298] futex(0x7fbe5e0f43ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 299] <... futex resumed>) = -1 EAGAIN (Resource temporarily unavailable) [ 34.032544][ T36] audit: type=1400 audit(1750628150.120:64): avc: denied { execmem } for pid=297 comm="syz-executor425" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [pid 299] mount(NULL, "./file0", "9p", 0, "trans=fd,rfdno=0x0000000000000003,wfdno=0x0000000000000005," [pid 298] <... futex resumed>) = -1 ETIMEDOUT (Connection timed out) [pid 298] futex(0x7fbe5e0f43ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out) [pid 298] futex(0x7fbe5e0f43ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out) [pid 298] futex(0x7fbe5e0f43fc, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 298] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7fbe5dfd6000 [pid 298] mprotect(0x7fbe5dfd7000, 131072, PROT_READ|PROT_WRITE) = 0 [pid 298] rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 [pid 298] clone3({flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, child_tid=0x7fbe5dff6990, parent_tid=0x7fbe5dff6990, exit_signal=0, stack=0x7fbe5dfd6000, stack_size=0x20300, tls=0x7fbe5dff66c0}./strace-static-x86_64: Process 301 attached [pid 301] set_robust_list(0x7fbe5dff69a0, 24) = 0 [pid 298] <... clone3 resumed> => {parent_tid=[301]}, 88) = 301 [pid 301] rt_sigprocmask(SIG_SETMASK, [], [pid 298] rt_sigprocmask(SIG_SETMASK, [], [pid 301] <... rt_sigprocmask resumed>NULL, 8) = 0 [pid 298] <... rt_sigprocmask resumed>NULL, 8) = 0 [pid 301] futex(0x7fbe5e0f43f8, FUTEX_WAIT_PRIVATE, 0, NULL [pid 298] futex(0x7fbe5e0f43f8, FUTEX_WAKE_PRIVATE, 1000000 [pid 301] <... futex resumed>) = -1 EAGAIN (Resource temporarily unavailable) [pid 298] <... futex resumed>) = 0 [pid 301] sync( [ 34.077368][ T36] audit: type=1400 audit(1750628150.160:65): avc: denied { mounton } for pid=298 comm="syz-executor425" path="/root/file0" dev="sda1" ino=2024 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_home_t tclass=file permissive=1 [pid 298] futex(0x7fbe5e0f43fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 ETIMEDOUT (Connection timed out) [pid 298] futex(0x7fbe5e0f43fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out) [pid 298] exit_group(0) = ? [pid 297] kill(-298, SIGKILL) = 0 [pid 297] kill(298, SIGKILL) = 0 [pid 297] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 297] newfstatat(3, "", {st_mode=S_IFDIR|0755, st_size=0, ...}, AT_EMPTY_PATH) = 0 [pid 297] getdents64(3, 0x55557c170730 /* 2 entries */, 32768) = 48 [pid 297] getdents64(3, 0x55557c170730 /* 0 entries */, 32768) = 0 [pid 297] close(3) = 0 [ 122.080798][ T37] sched: DL replenish lagged too much [ 244.960858][ T37] INFO: task syz-executor425:301 blocked for more than 122 seconds. [ 244.968912][ T37] Not tainted 6.12.23-syzkaller-gd9fd901baa98 #0 [ 244.975839][ T37] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 244.984559][ T37] task:syz-executor425 state:D stack:0 pid:301 tgid:298 ppid:297 flags:0x00004004 [ 244.994755][ T37] Call Trace: [ 244.998056][ T37] [ 245.001013][ T37] __schedule+0x145b/0x1f10 [ 245.005625][ T37] ? __sched_text_start+0x10/0x10 [ 245.010679][ T37] ? _raw_spin_lock_irqsave+0xaf/0x150 [ 245.016136][ T37] ? mutex_unlock+0x8b/0x240 [ 245.020762][ T37] ? _raw_spin_unlock_irqrestore+0x4a/0x70 [ 245.026780][ T37] schedule+0xc6/0x240 [ 245.030970][ T37] super_lock+0x150/0x300 [ 245.035297][ T37] ? user_get_super+0x350/0x350 [ 245.040214][ T37] ? __cfi_var_wake_function+0x10/0x10 [ 245.045699][ T37] ? __kasan_check_write+0x18/0x20 [ 245.050827][ T37] iterate_supers+0x8a/0x560 [ 245.055405][ T37] ? __cfi_sync_inodes_one_sb+0x10/0x10 [ 245.060967][ T37] ksys_sync+0x95/0x160 [ 245.065121][ T37] ? __cfi_ksys_sync+0x10/0x10 [ 245.069896][ T37] __ia32_sys_sync+0x12/0x20 [ 245.074667][ T37] x64_sys_call+0x2a58/0x2ee0 [ 245.079390][ T37] do_syscall_64+0x58/0xf0 [ 245.083860][ T37] ? clear_bhb_loop+0x35/0x90 [ 245.088543][ T37] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 245.094654][ T37] RIP: 0033:0x7fbe5e06a7a9 [ 245.099086][ T37] RSP: 002b:00007fbe5dff6218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 [ 245.107527][ T37] RAX: ffffffffffffffda RBX: 00007fbe5e0f43f8 RCX: 00007fbe5e06a7a9 [ 245.115517][ T37] RDX: ffffffffffffffb0 RSI: 0000000000000000 RDI: 0000000000000080 [ 245.123507][ T37] RBP: 00007fbe5e0f43f0 R08: 0000000000000000 R09: 0000000000000000 [ 245.131503][ T37] R10: 00007ffd386c24b7 R11: 0000000000000246 R12: 00007fbe5e0c107c [ 245.139480][ T37] R13: 0030656c69662f2e R14: 0000200000000440 R15: 00007ffd386c24b8 [ 245.147478][ T37] [ 245.150540][ T37] NMI backtrace for cpu 1 [ 245.150554][ T37] CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.23-syzkaller-gd9fd901baa98 #0 f1acc3ef52b3e732a05c4f7a2560722db90bb473 [ 245.150571][ T37] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 245.150577][ T37] Call Trace: [ 245.150581][ T37] [ 245.150585][ T37] __dump_stack+0x21/0x30 [ 245.150600][ T37] dump_stack_lvl+0x10c/0x190 [ 245.150611][ T37] ? __cfi_dump_stack_lvl+0x10/0x10 [ 245.150622][ T37] dump_stack+0x19/0x20 [ 245.150632][ T37] nmi_cpu_backtrace+0x2bf/0x2d0 [ 245.150644][ T37] ? rcu_read_unlock_special+0xab/0x480 [ 245.150653][ T37] ? __cfi_nmi_cpu_backtrace+0x10/0x10 [ 245.150664][ T37] ? sched_show_task+0x379/0x560 [ 245.150675][ T37] ? __rcu_read_unlock+0xc0/0xc0 [ 245.150688][ T37] ? __cfi_nmi_raise_cpu_backtrace+0x10/0x10 [ 245.150698][ T37] ? __cfi_nmi_raise_cpu_backtrace+0x10/0x10 [ 245.150707][ T37] nmi_trigger_cpumask_backtrace+0x142/0x2c0 [ 245.150719][ T37] arch_trigger_cpumask_backtrace+0x14/0x20 [ 245.150728][ T37] watchdog+0xd8f/0xed0 [ 245.150739][ T37] ? __cfi_watchdog+0x10/0x10 [ 245.150748][ T37] ? __kasan_check_read+0x15/0x20 [ 245.150758][ T37] ? __kthread_parkme+0x138/0x180 [ 245.150770][ T37] ? schedule+0xc6/0x240 [ 245.150783][ T37] kthread+0x2c7/0x370 [ 245.150795][ T37] ? __cfi_watchdog+0x10/0x10 [ 245.150804][ T37] ? __cfi_kthread+0x10/0x10 [ 245.150815][ T37] ret_from_fork+0x64/0xa0 [ 245.150826][ T37] ? __cfi_kthread+0x10/0x10 [ 245.150872][ T37] ret_from_fork_asm+0x1a/0x30 [ 245.150884][ T37] [ 245.150888][ T37] Sending NMI from CPU 1 to CPUs 0: [ 245.311257][ C0] NMI backtrace for cpu 0 skipped: idling at default_idle+0x17/0x20