./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor192400975 <...> DUID 00:04:ac:03:58:10:d0:76:5c:28:30:a7:8a:8b:4a:a3:06:e2 forked to background, child pid 4669 [ 32.379986][ T4670] 8021q: adding VLAN 0 to HW filter on device bond0 [ 32.391463][ T4670] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.0.154' (ECDSA) to the list of known hosts. execve("./syz-executor192400975", ["./syz-executor192400975"], 0x7ffcf14a6ed0 /* 10 vars */) = 0 brk(NULL) = 0x555555ee4000 brk(0x555555ee4c40) = 0x555555ee4c40 arch_prctl(ARCH_SET_FS, 0x555555ee4300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor192400975", 4096) = 27 brk(0x555555f05c40) = 0x555555f05c40 brk(0x555555f06000) = 0x555555f06000 mprotect(0x7f7d96f69000, 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=0x555555ee45d0) = 5002 ./strace-static-x86_64: Process 5002 attached [pid 5002] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5002] setpgid(0, 0) = 0 [pid 5002] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5002] write(3, "1000", 4) = 4 [pid 5002] close(3) = 0 [pid 5002] memfd_create("syzkaller", 0) = 3 [pid 5002] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7d8eaae000 [pid 5002] 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 5002] munmap(0x7f7d8eaae000, 1048576) = 0 [pid 5002] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5002] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5002] close(3) = 0 [pid 5002] mkdir("./file0", 0777) = 0 syzkaller login: [ 58.791993][ T5002] memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=5002 'syz-executor192' [ 58.822393][ T5002] loop0: detected capacity change from 0 to 2048 [ 58.832661][ T5002] EXT4-fs: Ignoring removed nobh option [pid 5002] mount("/dev/loop0", "./file0", "ext4", MS_NOSUID|MS_SYNCHRONOUS|MS_NOATIME|MS_NODIRATIME, "data_err=abort,bsdgroups,data_err=ignore,nodelalloc,init_itable=0x0000000000000007,nogrpid,nobh,resg"...) = 0 [pid 5002] openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY) = 3 [pid 5002] chdir("./file0") = 0 [pid 5002] ioctl(4, LOOP_CLR_FD) = 0 [pid 5002] close(4) = 0 [pid 5002] openat(AT_FDCWD, "cpuset.effective_cpus", O_RDWR|O_CREAT|O_NOCTTY|O_TRUNC|O_APPEND|FASYNC|0x18, 000) = 4 [pid 5002] write(4, "0xfffffffffffffffd", 18) = 18 [ 58.851615][ T5002] EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: none. [pid 5002] ioctl(4, _IOC(_IOC_WRITE, 0x58, 0x29, 0x30), 0x20000000 [pid 5001] kill(-5002, SIGKILL) = 0 [pid 5001] kill(5002, SIGKILL) = 0 [pid 5001] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5001] fstat(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 [pid 5001] getdents64(3, 0x555555ee5620 /* 2 entries */, 32768) = 48 [pid 5001] getdents64(3, 0x555555ee5620 /* 0 entries */, 32768) = 0 [pid 5001] close(3) = 0 [ 76.607979][ T7] cfg80211: failed to load regulatory.db [ 286.526321][ T28] INFO: task syz-executor192:5002 blocked for more than 143 seconds. [ 286.534526][ T28] Not tainted 6.3.0-next-20230428-syzkaller #0 [ 286.541341][ T28] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 286.550107][ T28] task:syz-executor192 state:D stack:25720 pid:5002 ppid:5001 flags:0x00004004 [ 286.559889][ T28] Call Trace: [ 286.563186][ T28] [ 286.566183][ T28] __schedule+0x1d15/0x5790 [ 286.570846][ T28] ? print_usage_bug.part.0+0x660/0x660 [ 286.576500][ T28] ? find_held_lock+0x2d/0x110 [ 286.581289][ T28] ? io_schedule_timeout+0x150/0x150 [ 286.586615][ T28] ? prepare_to_wait_exclusive+0xdf/0x2c0 [ 286.592369][ T28] ? lock_downgrade+0x690/0x690 [ 286.597332][ T28] ? mark_held_locks+0x9f/0xe0 [ 286.602141][ T28] ? _raw_spin_unlock_irqrestore+0x54/0x70 [ 286.614861][ T28] schedule+0xde/0x1a0 [ 286.619018][ T28] io_schedule+0xbe/0x130 [ 286.623734][ T28] bit_wait_io+0x16/0xe0 [ 286.628036][ T28] __wait_on_bit_lock+0x11f/0x1a0 [ 286.633088][ T28] ? bit_wait+0xe0/0xe0 [ 286.637306][ T28] out_of_line_wait_on_bit_lock+0xd9/0x110 [ 286.643136][ T28] ? __wait_on_bit_lock+0x1a0/0x1a0 [ 286.648378][ T28] ? cpuacct_css_alloc+0x160/0x160 [ 286.653519][ T28] ? _raw_spin_unlock+0x28/0x40 [ 286.658589][ T28] __sync_dirty_buffer+0x30e/0x380 [ 286.663857][ T28] __ext4_handle_dirty_metadata+0x2b7/0x8e0 [ 286.669826][ T28] ? __ext4_journal_get_create_access+0x182/0x1f0 [ 286.676301][ T28] ext4_convert_inline_data_nolock+0x6e6/0xf10 [ 286.682488][ T28] ? ext4_destroy_inline_data_nolock+0x580/0x580 [ 286.688905][ T28] ? down_write_killable+0x250/0x250 [ 286.694231][ T28] ? __ext4_journal_start_sb+0x1fc/0x5d0 [ 286.699923][ T28] ? ext4_convert_inline_data+0x316/0x5f0 [ 286.705665][ T28] ext4_convert_inline_data+0x51a/0x5f0 [ 286.711282][ T28] ? ext4_inline_data_truncate+0xd70/0xd70 [ 286.717167][ T28] ? down_write_killable+0x250/0x250 [ 286.722458][ T28] ? aa_path_link+0x2f0/0x2f0 [ 286.727220][ T28] ext4_fallocate+0x19f/0x3cd0 [ 286.732014][ T28] ? ext4_ext_truncate+0x400/0x400 [ 286.737210][ T28] ? ext4_ext_truncate+0x400/0x400 [ 286.742336][ T28] vfs_fallocate+0x48b/0xe40 [ 286.746982][ T28] ioctl_preallocate+0x18e/0x200 [ 286.751935][ T28] ? fiemap_prep+0x220/0x220 [ 286.756593][ T28] do_vfs_ioctl+0x1306/0x1670 [ 286.761284][ T28] ? vfs_fileattr_set+0xc40/0xc40 [ 286.766623][ T28] ? find_held_lock+0x2d/0x110 [ 286.771419][ T28] ? name_to_dev_t+0x1d2/0x9e0 [ 286.776491][ T28] ? lock_downgrade+0x690/0x690 [ 286.781356][ T28] ? bpf_lsm_file_ioctl+0x9/0x10 [ 286.786550][ T28] __x64_sys_ioctl+0x10c/0x210 [ 286.791315][ T28] do_syscall_64+0x39/0xb0 [ 286.795773][ T28] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 286.802024][ T28] RIP: 0033:0x7f7d96efb569 [ 286.806586][ T28] RSP: 002b:00007ffc7b0e5938 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 286.814996][ T28] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7d96efb569 [ 286.823245][ T28] RDX: 0000000020000000 RSI: 0000000040305829 RDI: 0000000000000004 [ 286.831685][ T28] RBP: 0000000000000000 R08: 00007f7d96f69ec0 R09: 00007f7d96f69ec0 [ 286.840040][ T28] R10: 0000000000000012 R11: 0000000000000246 R12: 00007ffc7b0e5960 [ 286.848297][ T28] R13: 0000000000000000 R14: 431bde82d7b634db R15: 0000000000000000 [ 286.856500][ T28] [ 286.859550][ T28] [ 286.859550][ T28] Showing all locks held in the system: [ 286.867539][ T28] 1 lock held by rcu_tasks_kthre/13: [ 286.872817][ T28] #0: ffffffff8c798df0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 [ 286.883600][ T28] 1 lock held by rcu_tasks_trace/14: [ 286.888979][ T28] #0: ffffffff8c798af0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 [ 286.900228][ T28] 1 lock held by khungtaskd/28: [ 286.905175][ T28] #0: ffffffff8c799a00 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x390 [ 286.915157][ T28] 1 lock held by klogd/4445: [ 286.919833][ T28] #0: ffff8880b983c5d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2f/0x120 [ 286.929877][ T28] 2 locks held by getty/4756: [ 286.934557][ T28] #0: ffff88814b538098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 [ 286.944411][ T28] #1: ffffc900015902f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 [ 286.954619][ T28] 3 locks held by syz-executor192/5002: [ 286.960213][ T28] #0: ffff88802a256460 (sb_writers#4){.+.+}-{0:0}, at: ioctl_preallocate+0x18e/0x200 [ 286.969880][ T28] #1: ffff888075478e00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_fallocate+0x197/0x3cd0 [ 286.980609][ T28] #2: ffff888075478ac8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data+0x352/0x5f0 [ 286.991059][ T28] [ 286.993375][ T28] ============================================= [ 286.993375][ T28] [ 287.002253][ T28] NMI backtrace for cpu 1 [ 287.006705][ T28] CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.3.0-next-20230428-syzkaller #0 [ 287.015627][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 [ 287.025758][ T28] Call Trace: [ 287.029027][ T28] [ 287.031948][ T28] dump_stack_lvl+0xd9/0x150 [ 287.036632][ T28] nmi_cpu_backtrace+0x29c/0x350 [ 287.041869][ T28] ? lapic_can_unplug_cpu+0xa0/0xa0 [ 287.047160][ T28] nmi_trigger_cpumask_backtrace+0x2a4/0x300 [ 287.053140][ T28] watchdog+0xe16/0x1090 [ 287.057417][ T28] ? proc_dohung_task_timeout_secs+0x80/0x80 [ 287.063395][ T28] kthread+0x344/0x440 [ 287.067471][ T28] ? kthread_complete_and_exit+0x40/0x40 [ 287.073098][ T28] ret_from_fork+0x1f/0x30 [ 287.077516][ T28] [ 287.080620][ T28] Sending NMI from CPU 1 to CPUs 0: [ 287.085858][ C0] NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x40/0x50 [ 287.086838][ T28] Kernel panic - not syncing: hung_task: blocked tasks [ 287.086854][ T28] CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.3.0-next-20230428-syzkaller #0 [ 287.086877][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 [ 287.086890][ T28] Call Trace: [ 287.086896][ T28] [ 287.086903][ T28] dump_stack_lvl+0xd9/0x150 [ 287.086938][ T28] panic+0x686/0x730 [ 287.086973][ T28] ? panic_smp_self_stop+0xa0/0xa0 [ 287.087013][ T28] ? __irq_work_queue_local+0x132/0x3f0 [ 287.087066][ T28] ? irq_work_queue+0x2d/0x80 [ 287.087093][ T28] ? watchdog+0xbe8/0x1090 [ 287.087134][ T28] watchdog+0xbf9/0x1090 [ 287.087173][ T28] ? proc_dohung_task_timeout_secs+0x80/0x80 [ 287.087213][ T28] kthread+0x344/0x440 [ 287.087242][ T28] ? kthread_complete_and_exit+0x40/0x40 [ 287.087278][ T28] ret_from_fork+0x1f/0x30 [ 287.087324][ T28] [ 287.094212][ T28] Kernel Offset: disabled [ 287.185764][ T28] Rebooting in 86400 seconds..