./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor4077111769 <...> Warning: Permanently added '10.128.1.92' (ED25519) to the list of known hosts. execve("./syz-executor4077111769", ["./syz-executor4077111769"], 0x7ffe1445ae00 /* 10 vars */) = 0 brk(NULL) = 0x55555c9ab000 brk(0x55555c9abd40) = 0x55555c9abd40 arch_prctl(ARCH_SET_FS, 0x55555c9ab3c0) = 0 set_tid_address(0x55555c9ab690) = 5833 set_robust_list(0x55555c9ab6a0, 24) = 0 rseq(0x55555c9abce0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor4077111769", 4096) = 28 getrandom("\xee\xc1\x07\x2b\x56\x6c\x85\xb2", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55555c9abd40 brk(0x55555c9ccd40) = 0x55555c9ccd40 brk(0x55555c9cd000) = 0x55555c9cd000 mprotect(0x7fd8d46ae000, 16384, PROT_READ) = 0 mmap(0x3ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x3ffffffff000 mmap(0x400000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x400000000000 mmap(0x400001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x400001000000 unshare(CLONE_NEWPID) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5834 attached , child_tidptr=0x55555c9ab690) = 5834 [pid 5834] set_robust_list(0x55555c9ab6a0, 24) = 0 [pid 5834] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [ 126.242434][ T30] audit: type=1400 audit(1742468230.209:88): avc: denied { execmem } for pid=5833 comm="syz-executor407" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [pid 5834] getppid() = 0 [pid 5834] prlimit64(0, RLIMIT_AS, {rlim_cur=204800*1024, rlim_max=204800*1024}, NULL) = 0 [pid 5834] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=32768*1024, rlim_max=32768*1024}, NULL) = 0 [pid 5834] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=139264*1024, rlim_max=139264*1024}, NULL) = 0 [pid 5834] prlimit64(0, RLIMIT_STACK, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0 [pid 5834] prlimit64(0, RLIMIT_CORE, {rlim_cur=131072*1024, rlim_max=131072*1024}, NULL) = 0 [pid 5834] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=256}, NULL) = 0 [pid 5834] unshare(CLONE_NEWNS) = 0 [pid 5834] mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0 [pid 5834] unshare(CLONE_NEWIPC) = 0 [pid 5834] unshare(CLONE_NEWCGROUP) = 0 [pid 5834] unshare(CLONE_NEWUTS) = 0 [pid 5834] unshare(CLONE_SYSVSEM) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/kernel/shmmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "16777216", 8) = 8 [ 126.411268][ T30] audit: type=1400 audit(1742468230.379:89): avc: denied { mounton } for pid=5834 comm="syz-executor407" path="/" dev="sda1" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:root_t tclass=dir permissive=1 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/kernel/shmall", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "536870912", 9) = 9 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/kernel/shmmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "1024", 4) = 4 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/kernel/msgmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "8192", 4) = 4 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/kernel/msgmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "1024", 4) = 4 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/kernel/msgmnb", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "1024", 4) = 4 [pid 5834] close(3) = 0 [pid 5834] openat(AT_FDCWD, "/proc/sys/kernel/sem", O_WRONLY|O_CLOEXEC) = 3 [pid 5834] write(3, "1024 1048576 500 1024", 21) = 21 [pid 5834] close(3) = 0 [pid 5834] getpid() = 1 [pid 5834] capget({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1< [pid 5839] rseq(0x7fd8d45e4fe0, 0x20, 0, 0x53053053 [pid 5838] <... clone3 resumed> => {parent_tid=[3]}, 88) = 3 [pid 5839] <... rseq resumed>) = 0 [pid 5839] set_robust_list(0x7fd8d45e49a0, 24 [pid 5838] rt_sigprocmask(SIG_SETMASK, [], [pid 5839] <... set_robust_list resumed>) = 0 [pid 5838] <... rt_sigprocmask resumed>NULL, 8) = 0 [pid 5839] rt_sigprocmask(SIG_SETMASK, [], [pid 5838] futex(0x7fd8d46b4328, FUTEX_WAKE_PRIVATE, 1000000 [pid 5839] <... rt_sigprocmask resumed>NULL, 8) = 0 [pid 5838] <... futex resumed>) = 0 [pid 5838] futex(0x7fd8d46b432c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 5839] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3 [pid 5839] futex(0x7fd8d46b432c, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 5839] futex(0x7fd8d46b4328, FUTEX_WAIT_PRIVATE, 0, NULL [pid 5838] <... futex resumed>) = 0 [pid 5838] futex(0x7fd8d46b4328, FUTEX_WAKE_PRIVATE, 1000000 [pid 5839] <... futex resumed>) = 0 [pid 5838] <... futex resumed>) = 1 [pid 5839] socketpair(AF_UNIX, SOCK_STREAM, 0, [pid 5838] futex(0x7fd8d46b432c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 5839] <... socketpair resumed>[4, 5]) = 0 [pid 5839] futex(0x7fd8d46b432c, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 5838] <... futex resumed>) = 0 [pid 5839] futex(0x7fd8d46b4328, FUTEX_WAIT_PRIVATE, 0, NULL [pid 5838] futex(0x7fd8d46b4328, FUTEX_WAKE_PRIVATE, 1000000 [pid 5839] <... futex resumed>) = -1 EAGAIN (Resource temporarily unavailable) [pid 5838] <... futex resumed>) = 0 [pid 5839] ioctl(3, NBD_SET_SOCK, 4 [pid 5838] futex(0x7fd8d46b432c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 5839] <... ioctl resumed>) = 0 [pid 5839] futex(0x7fd8d46b432c, FUTEX_WAKE_PRIVATE, 1000000 [pid 5838] <... futex resumed>) = 0 [pid 5839] <... futex resumed>) = 1 [pid 5838] futex(0x7fd8d46b4328, FUTEX_WAKE_PRIVATE, 1000000 [pid 5839] ioctl(3, NBD_DO_IT [pid 5838] <... futex resumed>) = 0 [pid 5838] futex(0x7fd8d46b432c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 ETIMEDOUT (Connection timed out) [pid 5838] futex(0x7fd8d46b433c, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 5838] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7fd8d45a3000 [pid 5838] mprotect(0x7fd8d45a4000, 131072, PROT_READ|PROT_WRITE) = 0 [pid 5838] rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 [pid 5838] clone3({flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, child_tid=0x7fd8d45c3990, parent_tid=0x7fd8d45c3990, exit_signal=0, stack=0x7fd8d45a3000, stack_size=0x20300, tls=0x7fd8d45c36c0}./strace-static-x86_64: Process 5840 attached [pid 5840] rseq(0x7fd8d45c3fe0, 0x20, 0, 0x53053053) = 0 [pid 5840] set_robust_list(0x7fd8d45c39a0, 24 [pid 5838] <... clone3 resumed> => {parent_tid=[4]}, 88) = 4 [pid 5840] <... set_robust_list resumed>) = 0 [pid 5838] rt_sigprocmask(SIG_SETMASK, [], [pid 5840] rt_sigprocmask(SIG_SETMASK, [], [pid 5838] <... rt_sigprocmask resumed>NULL, 8) = 0 [pid 5840] <... rt_sigprocmask resumed>NULL, 8) = 0 [pid 5840] ioctl(3, NBD_SET_SIZE, 2147483647 [pid 5838] futex(0x7fd8d46b4338, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 5838] futex(0x7fd8d46b433c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 5840] <... ioctl resumed>) = 0 [pid 5840] futex(0x7fd8d46b433c, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 5840] futex(0x7fd8d46b4338, FUTEX_WAIT_PRIVATE, 0, NULL [pid 5838] <... futex resumed>) = 0 [ 127.590174][ T5840] nbd0: detected capacity change from 0 to 4194303 [pid 5838] close(3) = 0 [pid 5838] close(4) = 0 [pid 5838] close(5) = 0 [pid 5838] close(6) = -1 EBADF (Bad file descriptor) [pid 5838] close(7) = -1 EBADF (Bad file descriptor) [pid 5838] close(8) = -1 EBADF (Bad file descriptor) [pid 5838] close(9) = -1 EBADF (Bad file descriptor) [pid 5838] close(10) = -1 EBADF (Bad file descriptor) [pid 5838] close(11) = -1 EBADF (Bad file descriptor) [ 127.762516][ T54] block nbd0: Receive control failed (result -104) [pid 5838] close(12) = -1 EBADF (Bad file descriptor) [pid 5838] close(13) = -1 EBADF (Bad file descriptor) [pid 5838] close(14) = -1 EBADF (Bad file descriptor) [pid 5838] close(15) = -1 EBADF (Bad file descriptor) [pid 5838] close(16) = -1 EBADF (Bad file descriptor) [pid 5838] close(17) = -1 EBADF (Bad file descriptor) [pid 5838] close(18) = -1 EBADF (Bad file descriptor) [pid 5838] close(19) = -1 EBADF (Bad file descriptor) [pid 5838] close(20) = -1 EBADF (Bad file descriptor) [pid 5838] close(21) = -1 EBADF (Bad file descriptor) [pid 5838] close(22) = -1 EBADF (Bad file descriptor) [pid 5838] close(23) = -1 EBADF (Bad file descriptor) [pid 5838] close(24) = -1 EBADF (Bad file descriptor) [pid 5838] close(25) = -1 EBADF (Bad file descriptor) [pid 5838] close(26) = -1 EBADF (Bad file descriptor) [pid 5838] close(27) = -1 EBADF (Bad file descriptor) [pid 5838] close(28) = -1 EBADF (Bad file descriptor) [pid 5838] close(29) = -1 EBADF (Bad file descriptor) [pid 5838] exit_group(0 [pid 5840] <... futex resumed>) = ? [pid 5838] <... exit_group resumed>) = ? [pid 5840] +++ exited with 0 +++ [pid 5834] kill(-2, SIGKILL) = 0 [pid 5834] kill(2, SIGKILL) = 0 [pid 5834] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5834] newfstatat(3, "", {st_mode=S_IFDIR|0755, st_size=0, ...}, AT_EMPTY_PATH) = 0 [pid 5834] getdents64(3, 0x55555c9ac730 /* 2 entries */, 32768) = 48 [pid 5834] getdents64(3, 0x55555c9ac730 /* 0 entries */, 32768) = 0 [pid 5834] close(3) = 0 [ 158.110961][ T59] block nbd0: Possible stuck request ffff888026027000: control (read@0,4096B). Runtime 30 seconds [ 187.667161][ T5192] udevd[5192]: worker [5835] /devices/virtual/block/nbd0 is taking a long time [ 188.190847][ T11] block nbd0: Possible stuck request ffff888026027000: control (read@0,4096B). Runtime 60 seconds [ 218.270387][ T59] block nbd0: Possible stuck request ffff888026027000: control (read@0,4096B). Runtime 90 seconds [ 248.350328][ T59] block nbd0: Possible stuck request ffff888026027000: control (read@0,4096B). Runtime 120 seconds [ 278.430399][ T59] block nbd0: Possible stuck request ffff888026027000: control (read@0,4096B). Runtime 150 seconds [ 286.110751][ T31] INFO: task syz-executor407:5839 blocked for more than 143 seconds. [ 286.118886][ T31] Not tainted 6.14.0-rc7-syzkaller-00074-ga7f2e10ecd8f #0 [ 286.126591][ T31] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 286.135364][ T31] task:syz-executor407 state:D stack:27056 pid:5839 tgid:5838 ppid:5834 task_flags:0x400140 flags:0x00004006 [ 286.147384][ T31] Call Trace: [ 286.150689][ T31] [ 286.153606][ T31] __schedule+0xf43/0x5890 [ 286.158022][ T31] ? __pfx___lock_acquire+0x10/0x10 [ 286.163237][ T31] ? __pfx___lock_acquire+0x10/0x10 [ 286.168442][ T31] ? __pfx___schedule+0x10/0x10 [ 286.173304][ T31] ? schedule+0x298/0x350 [ 286.177645][ T31] ? __pfx_lock_release+0x10/0x10 [ 286.182717][ T31] ? __mutex_trylock_common+0x78/0x250 [ 286.188182][ T31] ? lock_acquire+0x2f/0xb0 [ 286.192702][ T31] ? schedule+0x1fd/0x350 [ 286.197030][ T31] schedule+0xe7/0x350 [ 286.201118][ T31] schedule_preempt_disabled+0x13/0x30 [ 286.206573][ T31] __mutex_lock+0x6bd/0xb10 [ 286.211085][ T31] ? lock_acquire.part.0+0x11b/0x380 [ 286.216371][ T31] ? bdev_release+0x15a/0x6d0 [ 286.221069][ T31] ? __pfx___mutex_lock+0x10/0x10 [ 286.226091][ T31] ? __pfx_lock_release+0x10/0x10 [ 286.231144][ T31] ? locks_remove_file+0x34c/0x5a0 [ 286.236253][ T31] ? do_raw_spin_unlock+0x172/0x230 [ 286.241735][ T31] ? bdev_release+0x15a/0x6d0 [ 286.246440][ T31] bdev_release+0x15a/0x6d0 [ 286.251008][ T31] ? task_work_run+0x126/0x250 [ 286.255786][ T31] ? __pfx_blkdev_release+0x10/0x10 [ 286.261073][ T31] blkdev_release+0x15/0x20 [ 286.265590][ T31] __fput+0x3ff/0xb70 [ 286.269557][ T31] task_work_run+0x14e/0x250 [ 286.274199][ T31] ? __pfx_task_work_run+0x10/0x10 [ 286.279309][ T31] ? __pfx_task_work_add+0x10/0x10 [ 286.284490][ T31] ? __pfx_blkdev_ioctl+0x10/0x10 [ 286.289509][ T31] ? selinux_file_ioctl+0x180/0x270 [ 286.294773][ T31] ptrace_notify+0x10e/0x130 [ 286.299378][ T31] syscall_exit_to_user_mode_prepare+0x126/0x290 [ 286.305772][ T31] syscall_exit_to_user_mode+0x11/0x2a0 [ 286.311360][ T31] do_syscall_64+0xda/0x250 [ 286.315852][ T31] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 286.321801][ T31] RIP: 0033:0x7fd8d462c839 [ 286.326206][ T31] RSP: 002b:00007fd8d45e4218 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 286.334643][ T31] RAX: 0000000000000000 RBX: 00007fd8d46b4328 RCX: 00007fd8d462c839 [ 286.342665][ T31] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 [ 286.350664][ T31] RBP: 00007fd8d46b4320 R08: 0000000000000000 R09: 0000000000000000 [ 286.358625][ T31] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd8d46b432c [ 286.366642][ T31] R13: 00007fd8d468135c R14: 64626e2f7665642f R15: 0000400000000000 [ 286.374636][ T31] [ 286.377664][ T31] [ 286.377664][ T31] Showing all locks held in the system: [ 286.385443][ T31] 1 lock held by khungtaskd/31: [ 286.390313][ T31] #0: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 [ 286.400241][ T31] 2 locks held by getty/5570: [ 286.404902][ T31] #0: ffff8880364aa0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 [ 286.414660][ T31] #1: ffffc900033332f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 [ 286.424811][ T31] 1 lock held by udevd/5835: [ 286.429372][ T31] #0: ffff888025bca4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe20 [ 286.438700][ T31] 1 lock held by syz-executor407/5839: [ 286.444164][ T31] #0: ffff888025bca4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x15a/0x6d0 [ 286.453758][ T31] [ 286.456071][ T31] ============================================= [ 286.456071][ T31] [ 286.464496][ T31] NMI backtrace for cpu 1 [ 286.464505][ T31] CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-rc7-syzkaller-00074-ga7f2e10ecd8f #0 [ 286.464523][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 [ 286.464532][ T31] Call Trace: [ 286.464537][ T31] [ 286.464543][ T31] dump_stack_lvl+0x116/0x1f0 [ 286.464570][ T31] nmi_cpu_backtrace+0x27b/0x390 [ 286.464588][ T31] ? __pfx_nmi_raise_cpu_backtrace+0x10/0x10 [ 286.464612][ T31] nmi_trigger_cpumask_backtrace+0x29c/0x300 [ 286.464632][ T31] watchdog+0xf62/0x12b0 [ 286.464670][ T31] ? __pfx_watchdog+0x10/0x10 [ 286.464693][ T31] ? lockdep_hardirqs_on+0x7c/0x110 [ 286.464716][ T31] ? __kthread_parkme+0x148/0x220 [ 286.464734][ T31] ? __pfx_watchdog+0x10/0x10 [ 286.464759][ T31] kthread+0x3af/0x750 [ 286.464779][ T31] ? __pfx_kthread+0x10/0x10 [ 286.464802][ T31] ? __pfx_kthread+0x10/0x10 [ 286.464822][ T31] ret_from_fork+0x45/0x80 [ 286.464843][ T31] ? __pfx_kthread+0x10/0x10 [ 286.464863][ T31] ret_from_fork_asm+0x1a/0x30 [ 286.464891][ T31] [ 286.464897][ T31] Sending NMI from CPU 1 to CPUs 0: [ 286.576253][ C0] NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x1a/0x20 [ 286.577244][ T31] Kernel panic - not syncing: hung_task: blocked tasks [ 286.577254][ T31] CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-rc7-syzkaller-00074-ga7f2e10ecd8f #0 [ 286.577272][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 [ 286.577281][ T31] Call Trace: [ 286.577286][ T31] [ 286.577293][ T31] dump_stack_lvl+0x3d/0x1f0 [ 286.577316][ T31] panic+0x71d/0x800 [ 286.577333][ T31] ? __pfx_panic+0x10/0x10 [ 286.577348][ T31] ? __pfx__printk+0x10/0x10 [ 286.577367][ T31] ? ret_from_fork_asm+0x1a/0x30 [ 286.577387][ T31] ? irq_work_claim+0x76/0xa0 [ 286.577409][ T31] ? __pfx_nmi_raise_cpu_backtrace+0x10/0x10 [ 286.577429][ T31] ? irq_work_queue+0x2a/0x80 [ 286.577450][ T31] ? watchdog+0xdcc/0x12b0 [ 286.577471][ T31] ? watchdog+0xdbf/0x12b0 [ 286.577495][ T31] watchdog+0xddd/0x12b0 [ 286.577519][ T31] ? __pfx_watchdog+0x10/0x10 [ 286.577540][ T31] ? lockdep_hardirqs_on+0x7c/0x110 [ 286.577560][ T31] ? __kthread_parkme+0x148/0x220 [ 286.577576][ T31] ? __pfx_watchdog+0x10/0x10 [ 286.577598][ T31] kthread+0x3af/0x750 [ 286.577616][ T31] ? __pfx_kthread+0x10/0x10 [ 286.577637][ T31] ? __pfx_kthread+0x10/0x10 [ 286.577655][ T31] ret_from_fork+0x45/0x80 [ 286.577674][ T31] ? __pfx_kthread+0x10/0x10 [ 286.577691][ T31] ret_from_fork_asm+0x1a/0x30 [ 286.577715][ T31] [ 286.718000][ T31] Kernel Offset: disabled [ 286.722299][ T31] Rebooting in 86400 seconds..