./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor919851734 <...> Warning: Permanently added '10.128.0.189' (ECDSA) to the list of known hosts. execve("./syz-executor919851734", ["./syz-executor919851734"], 0x7ffeeec97250 /* 10 vars */) = 0 brk(NULL) = 0x555556d01000 brk(0x555556d01c40) = 0x555556d01c40 arch_prctl(ARCH_SET_FS, 0x555556d01300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor919851734", 4096) = 27 brk(0x555556d22c40) = 0x555556d22c40 brk(0x555556d23000) = 0x555556d23000 mprotect(0x7fe994b21000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = -1 ENXIO (No such device or address) close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555556d015d0) = 5075 ./strace-static-x86_64: Process 5075 attached [pid 5075] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5075] setpgid(0, 0) = 0 [pid 5075] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5075] write(3, "1000", 4) = 4 [pid 5075] close(3) = 0 [pid 5075] memfd_create("syzkaller", 0) = 3 [pid 5075] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fe98c666000 [pid 5075] write(3, "\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\x00\x00"..., 1048576) = 1048576 [pid 5075] munmap(0x7fe98c666000, 1048576) = 0 [pid 5075] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5075] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5075] close(3) = 0 [pid 5075] mkdir("./file0", 0777) = 0 syzkaller login: [ 41.851537][ T5075] memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=5075 'syz-executor919' [ 41.873657][ T5075] loop0: detected capacity change from 0 to 2048 [pid 5075] mount("/dev/loop0", "./file0", "ext4", MS_NOEXEC|MS_SYNCHRONOUS, ",errors=continue") = 0 [pid 5075] openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY) = 3 [pid 5075] chdir("./file0") = 0 [pid 5075] ioctl(4, LOOP_CLR_FD) = 0 [pid 5075] close(4) = 0 [ 41.891942][ T5075] EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: none. [pid 5075] mkdirat(AT_FDCWD, "./file0/file0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", 000 [pid 5074] kill(-5075, SIGKILL) = 0 [pid 5074] kill(5075, SIGKILL) = 0 [pid 5074] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5074] fstat(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 [pid 5074] getdents64(3, 0x555556d02620 /* 2 entries */, 32768) = 48 [pid 5074] getdents64(3, 0x555556d02620 /* 0 entries */, 32768) = 0 [pid 5074] close(3) = 0 [ 70.430067][ T7] cfg80211: failed to load regulatory.db [ 285.467367][ T28] INFO: task syz-executor919:5075 blocked for more than 143 seconds. [ 285.475566][ T28] Not tainted 6.3.0-rc4-syzkaller-00161-g62bad54b26db #0 [ 285.483266][ T28] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 285.492050][ T28] task:syz-executor919 state:D stack:25080 pid:5075 ppid:5074 flags:0x00004004 [ 285.501527][ T28] Call Trace: [ 285.504812][ T28] [ 285.507848][ T28] __schedule+0xc91/0x5770 [ 285.512322][ T28] ? find_held_lock+0x2d/0x110 [ 285.517081][ T28] ? io_schedule_timeout+0x150/0x150 [ 285.523323][ T28] ? lock_downgrade+0x690/0x690 [ 285.528210][ T28] ? mark_held_locks+0x9f/0xe0 [ 285.532974][ T28] ? _raw_spin_unlock_irqrestore+0x54/0x70 [ 285.538857][ T28] schedule+0xde/0x1a0 [ 285.542955][ T28] io_schedule+0xbe/0x130 [ 285.547327][ T28] bit_wait_io+0x16/0xe0 [ 285.551581][ T28] __wait_on_bit_lock+0x11f/0x1a0 [ 285.557449][ T28] ? out_of_line_wait_on_bit_timeout+0x170/0x170 [ 285.563795][ T28] out_of_line_wait_on_bit_lock+0xd9/0x110 [ 285.569637][ T28] ? __wait_on_bit_lock+0x1a0/0x1a0 [ 285.574873][ T28] ? cpuacct_css_alloc+0x160/0x160 [ 285.580035][ T28] ? _raw_spin_unlock+0x28/0x40 [ 285.584904][ T28] __sync_dirty_buffer+0x30e/0x380 [ 285.590059][ T28] __ext4_handle_dirty_metadata+0x2b7/0x8e0 [ 285.595973][ T28] ext4_handle_dirty_dirblock+0x371/0x470 [ 285.601838][ T28] ? ext4_rename_dir_prepare+0x7b0/0x7b0 [ 285.607537][ T28] ? ext4_init_dot_dotdot+0x3d7/0x5a0 [ 285.613265][ T28] ext4_convert_inline_data_nolock+0xac1/0xf10 [ 285.619476][ T28] ? ext4_destroy_inline_data_nolock+0x580/0x580 [ 285.625834][ T28] ? rwsem_down_write_slowpath+0x1220/0x1220 [ 285.631917][ T28] ? get_max_inline_xattr_value_size+0x114/0x560 [ 285.638293][ T28] ext4_try_add_inline_entry+0x473/0x8d0 [ 285.643916][ T28] ? ext4_set_context+0x5a0/0x5a0 [ 285.648978][ T28] ? ext4_da_write_inline_data_begin+0x1270/0x1270 [ 285.655585][ T28] ? ext4_reserve_inode_write+0x11c/0x270 [ 285.661365][ T28] ext4_add_entry+0x80d/0xe30 [ 285.666060][ T28] ? ext4_expand_extra_isize+0x5e0/0x5e0 [ 285.671735][ T28] ? make_indexed_dir+0x1080/0x1080 [ 285.676959][ T28] ext4_mkdir+0x42e/0xb20 [ 285.681352][ T28] ? ext4_init_new_dir+0x4c0/0x4c0 [ 285.686476][ T28] ? inode_permission.part.0+0xb5/0x520 [ 285.692061][ T28] ? bpf_lsm_inode_mkdir+0x9/0x10 [ 285.697210][ T28] vfs_mkdir+0x242/0x460 [ 285.701473][ T28] do_mkdirat+0x28d/0x310 [ 285.705792][ T28] ? __ia32_sys_mknod+0xb0/0xb0 [ 285.710687][ T28] ? getname_flags.part.0+0x1dd/0x4f0 [ 285.716075][ T28] __x64_sys_mkdirat+0x119/0x170 [ 285.721071][ T28] do_syscall_64+0x39/0xb0 [ 285.725502][ T28] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 285.731436][ T28] RIP: 0033:0x7fe994ab31e9 [ 285.735861][ T28] RSP: 002b:00007ffe43658be8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 [ 285.744346][ T28] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe994ab31e9 [ 285.752359][ T28] RDX: 0000000000000000 RSI: 0000000020000400 RDI: 00000000ffffff9c [ 285.760409][ T28] RBP: 0000000000000000 R08: 0000000000000743 R09: 0000000000000001 [ 285.768428][ T28] R10: 00007ffe43658ab0 R11: 0000000000000246 R12: 00007ffe43658c10 [ 285.776392][ T28] R13: 0000000000000000 R14: 431bde82d7b634db R15: 0000000000000000 [ 285.784427][ T28] [ 285.787488][ T28] [ 285.787488][ T28] Showing all locks held in the system: [ 285.795221][ T28] 1 lock held by rcu_tasks_kthre/12: [ 285.800557][ T28] #0: ffffffff8c794a70 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 [ 285.811072][ T28] 1 lock held by rcu_tasks_trace/13: [ 285.816349][ T28] #0: ffffffff8c794770 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 [ 285.827380][ T28] 1 lock held by khungtaskd/28: [ 285.832229][ T28] #0: ffffffff8c7955c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 [ 285.842145][ T28] 1 lock held by klogd/4429: [ 285.846728][ T28] #0: ffff8880b983c298 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2f/0x120 [ 285.856718][ T28] 2 locks held by getty/4759: [ 285.861438][ T28] #0: ffff88802bc42098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 [ 285.871305][ T28] #1: ffffc900015b02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 [ 285.881502][ T28] 3 locks held by syz-executor919/5075: [ 285.887094][ T28] #0: ffff88807ab42460 (sb_writers#4){.+.+}-{0:0}, at: filename_create+0xf1/0x4a0 [ 285.896537][ T28] #1: ffff8880764cca38 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: filename_create+0x1aa/0x4a0 [ 285.907242][ T28] #2: ffff8880764cc700 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_add_inline_entry+0x10c/0x8d0 [ 285.917950][ T28] [ 285.920280][ T28] ============================================= [ 285.920280][ T28] [ 285.928735][ T28] NMI backtrace for cpu 1 [ 285.933085][ T28] CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.3.0-rc4-syzkaller-00161-g62bad54b26db #0 [ 285.942870][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 [ 285.952909][ T28] Call Trace: [ 285.956171][ T28] [ 285.959109][ T28] dump_stack_lvl+0xd9/0x150 [ 285.963689][ T28] nmi_cpu_backtrace+0x29c/0x350 [ 285.968617][ T28] ? lapic_can_unplug_cpu+0xa0/0xa0 [ 285.973800][ T28] nmi_trigger_cpumask_backtrace+0x2a4/0x300 [ 285.979772][ T28] watchdog+0xe16/0x1090 [ 285.983997][ T28] ? proc_dohung_task_timeout_secs+0x80/0x80 [ 285.989984][ T28] kthread+0x2e8/0x3a0 [ 285.994047][ T28] ? kthread_complete_and_exit+0x40/0x40 [ 285.999717][ T28] ret_from_fork+0x1f/0x30 [ 286.004156][ T28] [ 286.007262][ T28] Sending NMI from CPU 1 to CPUs 0: [ 286.012510][ C0] NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x40/0x50 [ 286.013490][ T28] Kernel panic - not syncing: hung_task: blocked tasks [ 286.028708][ T28] CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.3.0-rc4-syzkaller-00161-g62bad54b26db #0 [ 286.038590][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 [ 286.048635][ T28] Call Trace: [ 286.051902][ T28] [ 286.054825][ T28] dump_stack_lvl+0xd9/0x150 [ 286.059416][ T28] panic+0x688/0x730 [ 286.063307][ T28] ? panic_smp_self_stop+0x90/0x90 [ 286.068417][ T28] ? lapic_can_unplug_cpu+0xa0/0xa0 [ 286.073692][ T28] ? preempt_schedule_thunk+0x1a/0x20 [ 286.079153][ T28] ? watchdog+0xbe8/0x1090 [ 286.083562][ T28] watchdog+0xbf9/0x1090 [ 286.087795][ T28] ? proc_dohung_task_timeout_secs+0x80/0x80 [ 286.093772][ T28] kthread+0x2e8/0x3a0 [ 286.097838][ T28] ? kthread_complete_and_exit+0x40/0x40 [ 286.103462][ T28] ret_from_fork+0x1f/0x30 [ 286.107882][ T28] [ 286.111380][ T28] Kernel Offset: disabled [ 286.115699][ T28] Rebooting in 86400 seconds..