./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor348393439 <...> Warning: Permanently added '10.128.10.52' (ECDSA) to the list of known hosts. execve("./syz-executor348393439", ["./syz-executor348393439"], 0x7ffd80c28740 /* 10 vars */) = 0 brk(NULL) = 0x555556c4f000 brk(0x555556c4fc40) = 0x555556c4fc40 arch_prctl(ARCH_SET_FS, 0x555556c4f300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor348393439", 4096) = 27 brk(0x555556c70c40) = 0x555556c70c40 brk(0x555556c71000) = 0x555556c71000 mprotect(0x7f4d733b8000, 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=0x555556c4f5d0) = 5073 ./strace-static-x86_64: Process 5073 attached [pid 5073] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5073] setpgid(0, 0) = 0 [pid 5073] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5073] write(3, "1000", 4) = 4 [pid 5073] close(3) = 0 [pid 5073] memfd_create("syzkaller", 0) = 3 [pid 5073] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4d6aefd000 [pid 5073] 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"..., 262144) = 262144 [pid 5073] munmap(0x7f4d6aefd000, 262144) = 0 [pid 5073] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5073] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5073] close(3) = 0 [pid 5073] mkdir("./file0", 0777) = 0 syzkaller login: [ 61.843855][ T5073] memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=5073 'syz-executor348' [ 61.867482][ T5073] loop0: detected capacity change from 0 to 512 [pid 5073] mount("/dev/loop0", "./file0", "ext4", MS_SYNCHRONOUS|MS_I_VERSION|MS_STRICTATIME, ",errors=continue") = 0 [pid 5073] openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY) = 3 [pid 5073] chdir("./file0") = 0 [pid 5073] ioctl(4, LOOP_CLR_FD) = 0 [pid 5073] close(4) = 0 [pid 5073] open("./bus", O_RDWR|O_CREAT|O_NONBLOCK|O_LARGEFILE|O_NOFOLLOW|O_NOATIME, 000) = 4 [pid 5073] pwritev2(4, [{iov_base="\x85", iov_len=1}], 1, 0, RWF_HIPRI|RWF_DSYNC) = 1 [ 61.886904][ T5073] EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: none. [pid 5073] fallocate(4, 0, 0, 5 [pid 5072] kill(-5073, SIGKILL) = 0 [pid 5072] kill(5073, SIGKILL) = 0 [pid 5072] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5072] fstat(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 [pid 5072] getdents64(3, 0x555556c50620 /* 2 entries */, 32768) = 48 [pid 5072] getdents64(3, 0x555556c50620 /* 0 entries */, 32768) = 0 [pid 5072] close(3) = 0 [ 76.312151][ T26] cfg80211: failed to load regulatory.db [ 286.229981][ T28] INFO: task syz-executor348:5073 blocked for more than 143 seconds. [ 286.238202][ T28] Not tainted 6.2.0-rc2-next-20230105-syzkaller #0 [ 286.245842][ T28] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 286.254684][ T28] task:syz-executor348 state:D stack:24808 pid:5073 ppid:5072 flags:0x00004004 [ 286.264119][ T28] Call Trace: [ 286.267429][ T28] [ 286.270458][ T28] __schedule+0x25d0/0x5a70 [ 286.275117][ T28] ? find_held_lock+0x2d/0x110 [ 286.280060][ T28] ? io_schedule_timeout+0x150/0x150 [ 286.285395][ T28] ? _raw_spin_unlock_irqrestore+0x54/0x70 [ 286.291319][ T28] schedule+0xde/0x1b0 [ 286.295421][ T28] io_schedule+0xbe/0x130 [ 286.299881][ T28] bit_wait_io+0x16/0xe0 [ 286.304187][ T28] __wait_on_bit_lock+0x11f/0x1a0 [ 286.309242][ T28] ? bit_wait+0xe0/0xe0 [ 286.313509][ T28] out_of_line_wait_on_bit_lock+0xd9/0x110 [ 286.319382][ T28] ? __wait_on_bit_lock+0x1a0/0x1a0 [ 286.324737][ T28] ? group_init+0x6b0/0x6b0 [ 286.329279][ T28] __sync_dirty_buffer+0x30e/0x380 [ 286.334578][ T28] __ext4_handle_dirty_metadata+0x2b7/0x6f0 [ 286.340740][ T28] ? __ext4_journal_get_create_access+0x182/0x1f0 [ 286.347177][ T28] ext4_convert_inline_data_nolock+0x6e6/0xf10 [ 286.353734][ T28] ? ext4_destroy_inline_data_nolock+0x580/0x580 [ 286.360154][ T28] ? down_write_killable_nested+0x250/0x250 [ 286.366046][ T28] ? __ext4_journal_start_sb+0x231/0x890 [ 286.371815][ T28] ? ext4_convert_inline_data+0x316/0x5f0 [ 286.377585][ T28] ext4_convert_inline_data+0x51a/0x5f0 [ 286.383297][ T28] ? ext4_inline_data_truncate+0xd70/0xd70 [ 286.389143][ T28] ? down_write_killable_nested+0x250/0x250 [ 286.395183][ T28] ? do_raw_spin_lock+0x124/0x2b0 [ 286.400329][ T28] ? aa_path_link+0x2f0/0x2f0 [ 286.405095][ T28] ext4_fallocate+0x19a/0x4470 [ 286.409948][ T28] ? ext4_ext_truncate+0x400/0x400 [ 286.415103][ T28] ? ext4_ext_truncate+0x400/0x400 [ 286.420353][ T28] vfs_fallocate+0x48b/0xe40 [ 286.425085][ T28] __x64_sys_fallocate+0xd3/0x140 [ 286.430304][ T28] do_syscall_64+0x39/0xb0 [ 286.434806][ T28] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 286.440889][ T28] RIP: 0033:0x7f4d7334a549 [ 286.445330][ T28] RSP: 002b:00007fff9528fd98 EFLAGS: 00000246 ORIG_RAX: 000000000000011d [ 286.453809][ T28] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4d7334a549 [ 286.462055][ T28] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 286.470202][ T28] RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000003 [ 286.478237][ T28] R10: 0000000000000005 R11: 0000000000000246 R12: 00007fff9528fdd0 [ 286.486294][ T28] R13: 0000000000000000 R14: 431bde82d7b634db R15: 0000000000000000 [ 286.494373][ T28] [ 286.497446][ T28] [ 286.497446][ T28] Showing all locks held in the system: [ 286.505379][ T28] 1 lock held by rcu_tasks_kthre/12: [ 286.510722][ T28] #0: ffffffff8c792230 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xcd0 [ 286.521382][ T28] 1 lock held by rcu_tasks_trace/13: [ 286.526689][ T28] #0: ffffffff8c791f30 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xcd0 [ 286.537990][ T28] 1 lock held by khungtaskd/28: [ 286.542911][ T28] #0: ffffffff8c792d80 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x57/0x2d4 [ 286.552895][ T28] 2 locks held by getty/4750: [ 286.557612][ T28] #0: ffff888149f15098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 [ 286.567498][ T28] #1: ffffc900015a02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 [ 286.577771][ T28] 3 locks held by syz-executor348/5073: [ 286.583414][ T28] #0: ffff888024906460 (sb_writers#4){.+.+}-{0:0}, at: __x64_sys_fallocate+0xd3/0x140 [ 286.593215][ T28] #1: ffff888076534030 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_fallocate+0x192/0x4470 [ 286.604024][ T28] #2: ffff888076533cf8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data+0x352/0x5f0 [ 286.614525][ T28] [ 286.616859][ T28] ============================================= [ 286.616859][ T28] [ 286.625353][ T28] NMI backtrace for cpu 0 [ 286.629701][ T28] CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.2.0-rc2-next-20230105-syzkaller #0 [ 286.638999][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 286.649055][ T28] Call Trace: [ 286.652417][ T28] [ 286.655341][ T28] dump_stack_lvl+0xd1/0x138 [ 286.660022][ T28] nmi_cpu_backtrace.cold+0x24/0x18a [ 286.665307][ T28] nmi_trigger_cpumask_backtrace+0x32f/0x3c0 [ 286.672110][ T28] ? lapic_can_unplug_cpu+0x80/0x80 [ 286.677426][ T28] watchdog+0xcae/0x1050 [ 286.681760][ T28] ? proc_dohung_task_timeout_secs+0x80/0x80 [ 286.687756][ T28] kthread+0x2e8/0x3a0 [ 286.691878][ T28] ? kthread_complete_and_exit+0x40/0x40 [ 286.697509][ T28] ret_from_fork+0x1f/0x30 [ 286.702021][ T28] [ 286.705119][ T28] Sending NMI from CPU 0 to CPUs 1: [ 286.710425][ C1] NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x1fd/0x2a0 [ 286.711476][ T28] Kernel panic - not syncing: hung_task: blocked tasks [ 286.727094][ T28] CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.2.0-rc2-next-20230105-syzkaller #0 [ 286.736560][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 286.746612][ T28] Call Trace: [ 286.749884][ T28] [ 286.752827][ T28] dump_stack_lvl+0xd1/0x138 [ 286.757450][ T28] panic+0x2cc/0x626 [ 286.761378][ T28] ? panic_print_sys_info.part.0+0x110/0x110 [ 286.767455][ T28] ? preempt_schedule_thunk+0x1a/0x20 [ 286.772860][ T28] ? watchdog.cold+0x130/0x158 [ 286.777708][ T28] watchdog.cold+0x141/0x158 [ 286.782349][ T28] ? proc_dohung_task_timeout_secs+0x80/0x80 [ 286.788383][ T28] kthread+0x2e8/0x3a0 [ 286.792558][ T28] ? kthread_complete_and_exit+0x40/0x40 [ 286.798225][ T28] ret_from_fork+0x1f/0x30 [ 286.802681][ T28] [ 286.805853][ T28] Kernel Offset: disabled [ 286.810271][ T28] Rebooting in 86400 seconds..