./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1127585331 <...> Warning: Permanently added '10.128.1.176' (ECDSA) to the list of known hosts. execve("./syz-executor1127585331", ["./syz-executor1127585331"], 0x7ffdc323dac0 /* 10 vars */) = 0 brk(NULL) = 0x555555dff000 brk(0x555555dffc40) = 0x555555dffc40 arch_prctl(ARCH_SET_FS, 0x555555dff300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor1127585331", 4096) = 28 brk(0x555555e20c40) = 0x555555e20c40 brk(0x555555e21000) = 0x555555e21000 mprotect(0x7fbd847f8000, 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=0x555555dff5d0) = 5080 ./strace-static-x86_64: Process 5080 attached [pid 5080] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5080] setpgid(0, 0) = 0 [pid 5080] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5080] write(3, "1000", 4) = 4 [pid 5080] close(3) = 0 [pid 5080] memfd_create("syzkaller", 0) = 3 [pid 5080] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbd7c33d000 [pid 5080] 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 5080] munmap(0x7fbd7c33d000, 1048576) = 0 [pid 5080] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 syzkaller login: [ 56.347858][ T5080] memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=5080 'syz-executor112' [pid 5080] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5080] close(3) = 0 [pid 5080] mkdir("./file0", 0777) = 0 [pid 5080] mount("/dev/loop0", "./file0", "ext4", MS_SYNCHRONOUS, "stripe=0x0000000000000006,grpquota,i_version,dioread_lock,max_dir_size_kb=0x0000000000000401,jqfmt=v"...) = 0 [pid 5080] openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY) = 3 [pid 5080] chdir("./file0") = 0 [pid 5080] ioctl(4, LOOP_CLR_FD) = 0 [pid 5080] close(4) = 0 [pid 5080] openat(AT_FDCWD, "blkio.bfq.io_service_bytes", O_RDWR|O_CREAT|O_NOCTTY|O_TRUNC|O_APPEND|FASYNC|0x18, 000) = 4 [pid 5080] write(4, "\x65\x78\x74\x34\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", 76) = 76 [ 56.388978][ T5080] loop0: detected capacity change from 0 to 2048 [ 56.407093][ T5080] EXT4-fs: Ignoring removed i_version option [ 56.426774][ T5080] EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: writeback. [pid 5080] ioctl(4, _IOC(_IOC_WRITE, 0x58, 0x28, 0x30), 0x20000080 [pid 5079] kill(-5080, SIGKILL) = 0 [pid 5079] kill(5080, SIGKILL) = 0 [pid 5079] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5079] fstat(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 [pid 5079] getdents64(3, 0x555555e00620 /* 2 entries */, 32768) = 48 [pid 5079] getdents64(3, 0x555555e00620 /* 0 entries */, 32768) = 0 [pid 5079] close(3) = 0 [ 76.461958][ T77] cfg80211: failed to load regulatory.db [ 286.380264][ T28] INFO: task syz-executor112:5080 blocked for more than 143 seconds. [ 286.388487][ T28] Not tainted 6.2.0-rc5-next-20230123-syzkaller #0 [ 286.397477][ T28] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 286.406586][ T28] task:syz-executor112 state:D stack:26200 pid:5080 ppid:5079 flags:0x00004004 [ 286.415978][ T28] Call Trace: [ 286.419262][ T28] [ 286.422330][ T28] __schedule+0x25d0/0x5a70 [ 286.426924][ T28] ? lock_chain_count+0x20/0x20 [ 286.431913][ T28] ? find_held_lock+0x2d/0x110 [ 286.436739][ T28] ? io_schedule_timeout+0x150/0x150 [ 286.442185][ T28] ? mark_held_locks+0x9f/0xe0 [ 286.447003][ T28] ? _raw_spin_unlock_irqrestore+0x54/0x70 [ 286.453004][ T28] schedule+0xde/0x1a0 [ 286.457151][ T28] io_schedule+0xbe/0x130 [ 286.461800][ T28] bit_wait_io+0x16/0xe0 [ 286.466133][ T28] __wait_on_bit_lock+0x11f/0x1a0 [ 286.471301][ T28] ? out_of_line_wait_on_bit_timeout+0x170/0x170 [ 286.477695][ T28] out_of_line_wait_on_bit_lock+0xd9/0x110 [ 286.483989][ T28] ? __wait_on_bit_lock+0x1a0/0x1a0 [ 286.489242][ T28] ? group_init+0x6b0/0x6b0 [ 286.493951][ T28] __sync_dirty_buffer+0x30e/0x380 [ 286.499423][ T28] __ext4_handle_dirty_metadata+0x2b7/0x6f0 [ 286.505705][ T28] ? __ext4_journal_get_create_access+0x182/0x1f0 [ 286.512276][ T28] ext4_convert_inline_data_nolock+0x6e6/0xf10 [ 286.518549][ T28] ? ext4_destroy_inline_data_nolock+0x580/0x580 [ 286.525157][ T28] ? down_write_killable_nested+0x250/0x250 [ 286.531163][ T28] ? __ext4_journal_start_sb+0x231/0x890 [ 286.536903][ T28] ? ext4_convert_inline_data+0x316/0x5f0 [ 286.542780][ T28] ext4_convert_inline_data+0x51a/0x5f0 [ 286.548367][ T28] ? ext4_inline_data_truncate+0xd70/0xd70 [ 286.554290][ T28] ? down_write_killable_nested+0x250/0x250 [ 286.560723][ T28] ? aa_path_link+0x2f0/0x2f0 [ 286.565685][ T28] ext4_fallocate+0x19a/0x4470 [ 286.570918][ T28] ? ext4_ext_truncate+0x400/0x400 [ 286.576473][ T28] ? ext4_ext_truncate+0x400/0x400 [ 286.581751][ T28] vfs_fallocate+0x48b/0xe40 [ 286.586661][ T28] ioctl_preallocate+0x18e/0x200 [ 286.591986][ T28] ? fiemap_prep+0x220/0x220 [ 286.596742][ T28] do_vfs_ioctl+0x12e9/0x1600 [ 286.602124][ T28] ? vfs_fileattr_set+0xc40/0xc40 [ 286.607318][ T28] ? find_held_lock+0x2d/0x110 [ 286.612320][ T28] ? name_to_dev_t+0x262/0x990 [ 286.617173][ T28] ? bpf_lsm_file_ioctl+0x9/0x10 [ 286.622366][ T28] __x64_sys_ioctl+0x10c/0x210 [ 286.627190][ T28] do_syscall_64+0x39/0xb0 [ 286.631788][ T28] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 286.637790][ T28] RIP: 0033:0x7fbd8478a2a9 [ 286.642443][ T28] RSP: 002b:00007ffc25651a18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 286.651046][ T28] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbd8478a2a9 [ 286.659034][ T28] RDX: 0000000020000080 RSI: 0000000040305828 RDI: 0000000000000004 [ 286.667172][ T28] RBP: 0000000000000000 R08: 00007fbd847f8ec0 R09: 00007fbd847f8ec0 [ 286.675229][ T28] R10: 00007fbd847f8ec0 R11: 0000000000000246 R12: 00007ffc25651a40 [ 286.683320][ T28] R13: 0000000000000000 R14: 431bde82d7b634db R15: 0000000000000000 [ 286.691373][ T28] [ 286.694447][ T28] [ 286.694447][ T28] Showing all locks held in the system: [ 286.702220][ T28] 1 lock held by rcu_tasks_kthre/13: [ 286.707517][ T28] #0: ffffffff8c793cb0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xcd0 [ 286.718157][ T28] 1 lock held by rcu_tasks_trace/14: [ 286.723535][ T28] #0: ffffffff8c7939b0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xcd0 [ 286.734636][ T28] 1 lock held by khungtaskd/28: [ 286.739510][ T28] #0: ffffffff8c794880 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x57/0x2d4 [ 286.749567][ T28] 2 locks held by getty/4763: [ 286.754368][ T28] #0: ffff888027cdf098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 [ 286.764278][ T28] #1: ffffc900015a02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 [ 286.774561][ T28] 3 locks held by syz-executor112/5080: [ 286.780191][ T28] #0: ffff88802b0d0460 (sb_writers#4){.+.+}-{0:0}, at: ioctl_preallocate+0x18e/0x200 [ 286.789907][ T28] #1: ffff888077a02218 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_fallocate+0x192/0x4470 [ 286.800794][ T28] #2: ffff888077a01ee0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data+0x352/0x5f0 [ 286.811535][ T28] [ 286.813882][ T28] ============================================= [ 286.813882][ T28] [ 286.822363][ T28] NMI backtrace for cpu 0 [ 286.826706][ T28] CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.2.0-rc5-next-20230123-syzkaller #0 [ 286.835978][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 [ 286.846114][ T28] Call Trace: [ 286.849401][ T28] [ 286.852328][ T28] dump_stack_lvl+0xd1/0x138 [ 286.856923][ T28] nmi_cpu_backtrace.cold+0x24/0x18a [ 286.862231][ T28] nmi_trigger_cpumask_backtrace+0x32f/0x3c0 [ 286.868291][ T28] ? lapic_can_unplug_cpu+0x80/0x80 [ 286.873534][ T28] watchdog+0xcae/0x1050 [ 286.877851][ T28] ? proc_dohung_task_timeout_secs+0x80/0x80 [ 286.883845][ T28] kthread+0x2e8/0x3a0 [ 286.887976][ T28] ? kthread_complete_and_exit+0x40/0x40 [ 286.893615][ T28] ret_from_fork+0x1f/0x30 [ 286.898046][ T28] [ 286.901257][ T28] Sending NMI from CPU 0 to CPUs 1: [ 286.906552][ C1] NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x40/0x50 [ 286.907610][ T28] Kernel panic - not syncing: hung_task: blocked tasks [ 286.922624][ T28] CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.2.0-rc5-next-20230123-syzkaller #0 [ 286.931921][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 [ 286.941977][ T28] Call Trace: [ 286.945257][ T28] [ 286.948200][ T28] dump_stack_lvl+0xd1/0x138 [ 286.952812][ T28] panic+0x2cc/0x626 [ 286.956749][ T28] ? panic_print_sys_info.part.0+0x110/0x110 [ 286.962770][ T28] ? preempt_schedule_thunk+0x1a/0x20 [ 286.968266][ T28] ? watchdog.cold+0x130/0x158 [ 286.973178][ T28] watchdog.cold+0x141/0x158 [ 286.977785][ T28] ? proc_dohung_task_timeout_secs+0x80/0x80 [ 286.983775][ T28] kthread+0x2e8/0x3a0 [ 286.987851][ T28] ? kthread_complete_and_exit+0x40/0x40 [ 286.993495][ T28] ret_from_fork+0x1f/0x30 [ 286.998119][ T28] [ 287.001313][ T28] Kernel Offset: disabled [ 287.005641][ T28] Rebooting in 86400 seconds..