[ OK ] Started OpenBSD Secure Shell server. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.71' (ECDSA) to the list of known hosts. syzkaller login: [ 718.462563] IPVS: ftp: loaded support on port[0] = 21 executing program [ 1001.342465] INFO: task syz-executor135:7959 blocked for more than 140 seconds. [ 1001.349888] Not tainted 4.14.301-syzkaller #0 [ 1001.355561] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.363572] syz-executor135 D28368 7959 7958 0x00000000 [ 1001.369183] Call Trace: [ 1001.371751] __schedule+0x88b/0x1de0 [ 1001.375593] ? io_schedule_timeout+0x140/0x140 [ 1001.380167] ? lock_downgrade+0x740/0x740 [ 1001.384343] schedule+0x8d/0x1b0 [ 1001.387706] schedule_preempt_disabled+0xf/0x20 [ 1001.392428] __mutex_lock+0x669/0x1310 [ 1001.396324] ? fuse_lock_inode+0xb0/0xe0 [ 1001.400552] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1001.406046] ? d_alloc_parallel+0x666/0x16b0 [ 1001.410452] fuse_lock_inode+0xb0/0xe0 [ 1001.414377] fuse_lookup+0xa0/0x3e0 [ 1001.418016] ? is_bpf_text_address+0xb8/0x150 [ 1001.422551] ? fuse_lookup_name+0x550/0x550 [ 1001.426861] ? entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 1001.432201] ? __save_stack_trace+0xa0/0x160 [ 1001.436654] ? __d_lookup_rcu+0x640/0x640 [ 1001.440791] ? lock_acquire+0x170/0x3f0 [ 1001.444790] ? lookup_slow+0x129/0x400 [ 1001.448670] lookup_slow+0x20a/0x400 [ 1001.452429] ? follow_dotdot_rcu+0xf00/0xf00 [ 1001.456827] ? lookup_fast+0x430/0xe30 [ 1001.460696] ? trace_hardirqs_on+0x10/0x10 [ 1001.464961] walk_component+0x6a1/0xbc0 [ 1001.468936] ? lookup_fast+0xe30/0xe30 [ 1001.472987] ? fuse_allow_current_process+0x48/0x2b0 [ 1001.478083] ? security_inode_permission+0xb5/0xf0 [ 1001.483035] ? fuse_allow_current_process+0x2b0/0x2b0 [ 1001.488216] link_path_walk+0x823/0x10a0 [ 1001.492262] ? walk_component+0xbc0/0xbc0 [ 1001.496450] path_openat+0x15e/0x2970 [ 1001.500249] ? trace_hardirqs_on+0x10/0x10 [ 1001.504672] ? path_lookupat+0x780/0x780 [ 1001.508755] ? trace_hardirqs_on+0x10/0x10 [ 1001.513131] ? free_object+0xe4/0x240 [ 1001.516934] do_filp_open+0x179/0x3c0 [ 1001.520719] ? may_open_dev+0xe0/0xe0 [ 1001.524689] ? lock_downgrade+0x740/0x740 [ 1001.528837] ? do_raw_spin_unlock+0x164/0x220 [ 1001.533385] ? _raw_spin_unlock+0x29/0x40 [ 1001.537531] ? __alloc_fd+0x1be/0x490 [ 1001.541315] ? timespec_trunc+0x120/0x120 [ 1001.545502] do_sys_open+0x296/0x410 [ 1001.549211] ? filp_open+0x60/0x60 [ 1001.552798] ? __do_page_fault+0x159/0xad0 [ 1001.557026] ? do_syscall_64+0x4c/0x640 [ 1001.560999] ? SyS_open+0x30/0x30 [ 1001.564483] do_syscall_64+0x1d5/0x640 [ 1001.568378] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 1001.573607] RIP: 0033:0x7ff446989e58 [ 1001.577313] RSP: 002b:00007ffc9feb3410 EFLAGS: 00000287 ORIG_RAX: 0000000000000101 [ 1001.585102] RAX: ffffffffffffffda RBX: 00007ffc9feb3480 RCX: 00007ff446989e58 [ 1001.592421] RDX: 0000000000090800 RSI: 00007ff4469e0004 RDI: 00000000ffffff9c [ 1001.599685] RBP: 0000000000000002 R08: 0000000000090800 R09: 00007ff4469e0004 [ 1001.606990] R10: 0000000000000000 R11: 0000000000000287 R12: 00007ffc9feb360c [ 1001.614308] R13: 0000000000000002 R14: 00007ffc9feb3660 R15: 00007ffc9feb3650 [ 1001.621598] INFO: task syz-executor135:7986 blocked for more than 140 seconds. [ 1001.629031] Not tainted 4.14.301-syzkaller #0 [ 1001.634081] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.642037] syz-executor135 D27488 7986 7959 0x00000004 [ 1001.648136] Call Trace: [ 1001.650731] __schedule+0x88b/0x1de0 [ 1001.654485] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 1001.659497] ? io_schedule_timeout+0x140/0x140 [ 1001.664303] schedule+0x8d/0x1b0 [ 1001.667660] request_wait_answer+0x30d/0x620 [ 1001.672048] ? queue_interrupt+0x1f0/0x1f0 [ 1001.676323] ? preempt_schedule_common+0x45/0xc0 [ 1001.681073] ? wait_woken+0x230/0x230 [ 1001.684916] __fuse_request_send+0x108/0x1a0 [ 1001.689320] fuse_simple_request+0x2fa/0x790 [ 1001.693771] fuse_lookup_name+0x228/0x550 [ 1001.697919] ? fuse_readdir+0x11c0/0x11c0 [ 1001.702054] ? d_alloc_parallel+0x666/0x16b0 [ 1001.706532] fuse_lookup+0x102/0x3e0 [ 1001.710241] ? __save_stack_trace+0x63/0x160 [ 1001.714676] ? fuse_lookup_name+0x550/0x550 [ 1001.718989] ? lock_acquire+0x170/0x3f0 [ 1001.723015] lookup_slow+0x20a/0x400 [ 1001.726726] ? follow_dotdot_rcu+0xf00/0xf00 [ 1001.731202] ? lookup_fast+0x430/0xe30 [ 1001.735363] ? do_filp_open+0x179/0x3c0 [ 1001.739328] ? do_sys_open+0x296/0x410 [ 1001.743257] ? do_syscall_64+0x1d5/0x640 [ 1001.747312] ? entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 1001.752716] walk_component+0x6a1/0xbc0 [ 1001.756687] ? lookup_fast+0xe30/0xe30 [ 1001.760553] ? fuse_allow_current_process+0x48/0x2b0 [ 1001.765704] ? security_inode_permission+0xb5/0xf0 [ 1001.770628] ? fuse_allow_current_process+0x2b0/0x2b0 [ 1001.775850] link_path_walk+0x823/0x10a0 [ 1001.779908] ? walk_component+0xbc0/0xbc0 [ 1001.784096] path_lookupat+0xcb/0x780 [ 1001.787887] ? path_mountpoint+0x940/0x940 [ 1001.792101] ? __lockdep_init_map+0x100/0x560 [ 1001.796631] ? __lockdep_init_map+0x100/0x560 [ 1001.801118] ? debug_mutex_init+0x28/0x60 [ 1001.805307] path_openat+0x18eb/0x2970 [ 1001.809187] ? trace_hardirqs_on+0x10/0x10 [ 1001.813541] ? lock_downgrade+0x740/0x740 [ 1001.817689] ? path_lookupat+0x780/0x780 [ 1001.821751] ? trace_hardirqs_on+0x10/0x10 [ 1001.826038] ? __debug_object_init+0x3fc/0x7a0 [ 1001.830624] do_filp_open+0x179/0x3c0 [ 1001.834461] ? may_open_dev+0xe0/0xe0 [ 1001.838262] ? lock_downgrade+0x740/0x740 [ 1001.842452] ? do_raw_spin_unlock+0x164/0x220 [ 1001.846943] ? _raw_spin_unlock+0x29/0x40 [ 1001.851067] ? __alloc_fd+0x1be/0x490 [ 1001.854900] do_sys_open+0x296/0x410 [ 1001.858604] ? filp_open+0x60/0x60 [ 1001.862127] ? _raw_spin_unlock_irq+0x5a/0x80 [ 1001.866666] ? do_syscall_64+0x4c/0x640 [ 1001.870630] ? SyS_open+0x30/0x30 [ 1001.874114] do_syscall_64+0x1d5/0x640 [ 1001.877995] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 1001.883218] RIP: 0033:0x7ff44698a1c9 [ 1001.886953] RSP: 002b:00007ff44691a2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 1001.894688] RAX: ffffffffffffffda RBX: 00007ff446a134d0 RCX: 00007ff44698a1c9 [ 1001.901965] RDX: 0000000000200000 RSI: 0000000020000340 RDI: ffffffffffffff9c [ 1001.909273] RBP: 00007ff4469e01bc R08: 0000000000000000 R09: 0000000000000000 [ 1001.916578] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 1001.923888] R13: 65646f6d746f6f72 R14: 6873612f7665642f R15: 00007ff446a134d8 [ 1001.931172] [ 1001.931172] Showing all locks held in the system: [ 1001.937533] 1 lock held by khungtaskd/1533: [ 1001.941931] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1001.951066] 2 locks held by syz-executor135/7959: [ 1001.956032] #0: (&type->i_mutex_dir_key#7){++++}, at: [] lookup_slow+0x129/0x400 [ 1001.965367] #1: (&fi->mutex){+.+.}, at: [] fuse_lock_inode+0xb0/0xe0 [ 1001.973754] 2 locks held by syz-executor135/7986: [ 1001.978585] #0: (&type->i_mutex_dir_key#7){++++}, at: [] lookup_slow+0x129/0x400 [ 1001.987937] #1: (&fi->mutex){+.+.}, at: [] fuse_lock_inode+0xb0/0xe0 [ 1001.996314] [ 1001.997988] ============================================= [ 1001.997988] [ 1002.005207] NMI backtrace for cpu 1 [ 1002.008831] CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.301-syzkaller #0 [ 1002.016258] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 1002.025589] Call Trace: [ 1002.028154] dump_stack+0x1b2/0x281 [ 1002.031849] nmi_cpu_backtrace.cold+0x57/0x93 [ 1002.036322] ? irq_force_complete_move+0x350/0x350 [ 1002.041227] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 1002.046486] watchdog+0x5b9/0xb40 [ 1002.049936] ? hungtask_pm_notify+0x50/0x50 [ 1002.054241] kthread+0x30d/0x420 [ 1002.057583] ? kthread_create_on_node+0xd0/0xd0 [ 1002.062261] ret_from_fork+0x24/0x30 [ 1002.066045] Sending NMI from CPU 1 to CPUs 0: [ 1002.070898] NMI backtrace for cpu 0 [ 1002.070902] CPU: 0 PID: 4627 Comm: systemd-journal Not tainted 4.14.301-syzkaller #0 [ 1002.070907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 1002.070910] task: ffff8880a11fa200 task.stack: ffff8880a1200000 [ 1002.070913] RIP: 0010:get_page_from_freelist+0x1016/0x25a0 [ 1002.070915] RSP: 0018:ffff8880a12079f8 EFLAGS: 00000046 [ 1002.070920] RAX: 00000000ffffffff RBX: 0000000000000000 RCX: 0000000000000002 [ 1002.070924] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea000255dc58 [ 1002.070928] RBP: ffffea000255dc40 R08: ffffffff8b9c10e0 R09: 00000000000c001e [ 1002.070931] R10: dffffc0000000000 R11: 0000000000000100 R12: 0000000000000000 [ 1002.070935] R13: dffffc0000000000 R14: 0000000000000001 R15: ffff88813fffb6c0 [ 1002.070938] FS: 00007fa57eca68c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 1002.070942] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1002.070945] CR2: 00007fa57c07b000 CR3: 00000000a18f1000 CR4: 00000000003406f0 [ 1002.070949] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1002.070952] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1002.070954] Call Trace: [ 1002.070957] ? unwind_get_return_address+0x51/0x90 [ 1002.070959] ? entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 1002.070962] __alloc_pages_nodemask+0x352/0x2900 [ 1002.070964] ? kasan_kmalloc+0x139/0x160 [ 1002.070967] ? __lock_acquire+0x5fc/0x3f20 [ 1002.070969] ? kasan_kmalloc+0x139/0x160 [ 1002.070972] ? gfp_pfmemalloc_allowed+0x150/0x150 [ 1002.070974] ? trace_hardirqs_on+0x10/0x10 [ 1002.070977] ? entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 1002.070979] ? __put_seccomp_filter+0x90/0x90 [ 1002.070982] ? debug_check_no_obj_freed+0x2c0/0x680 [ 1002.070984] ? trace_hardirqs_on+0x10/0x10 [ 1002.070987] ? lock_acquire+0x170/0x3f0 [ 1002.070989] ? lock_downgrade+0x740/0x740 [ 1002.070991] cache_grow_begin+0x91/0x700 [ 1002.070994] ? fs_reclaim_release+0xd0/0x110 [ 1002.070996] ? check_preemption_disabled+0x35/0x240 [ 1002.070999] cache_alloc_refill+0x273/0x350 [ 1002.071001] kmem_cache_alloc+0x333/0x3c0 [ 1002.071004] getname_flags+0xc8/0x550 [ 1002.071006] user_path_at_empty+0x2a/0x50 [ 1002.071008] SyS_faccessat+0x21b/0x680 [ 1002.071010] ? SyS_fallocate+0x80/0x80 [ 1002.071013] ? do_syscall_64+0x4c/0x640 [ 1002.071015] ? SyS_faccessat+0x680/0x680 [ 1002.071017] do_syscall_64+0x1d5/0x640 [ 1002.071020] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 1002.071022] RIP: 0033:0x7fa57df619c7 [ 1002.071025] RSP: 002b:00007ffff6ba6808 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 [ 1002.071031] RAX: ffffffffffffffda RBX: 00007ffff6ba9830 RCX: 00007fa57df619c7 [ 1002.071034] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000055d53361c9a3 [ 1002.071037] RBP: 00007ffff6ba6950 R08: 000055d5336123e5 R09: 0000000000000018 [ 1002.071041] R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 [ 1002.071044] R13: 0000000000000000 R14: 000055d534b3a8a0 R15: 00007ffff6ba6e40 [ 1002.071046] Code: 04 00 00 48 8d 7d 18 48 89 f8 48 c1 e8 03 42 0f b6 14 28 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 18 14 00 00 8b 45 18 <83> f8 ff 0f 84 3c ff ff ff 48 89 ef e8 39 40 ff ff 8b 4c 24 18 [ 1002.071553] Kernel panic - not syncing: hung_task: blocked tasks [ 1002.374033] CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.301-syzkaller #0 [ 1002.381454] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 1002.390784] Call Trace: [ 1002.393350] dump_stack+0x1b2/0x281 [ 1002.396953] panic+0x1f9/0x42d [ 1002.400121] ? add_taint.cold+0x16/0x16 [ 1002.404074] watchdog+0x5ca/0xb40 [ 1002.407511] ? hungtask_pm_notify+0x50/0x50 [ 1002.411810] kthread+0x30d/0x420 [ 1002.415152] ? kthread_create_on_node+0xd0/0xd0 [ 1002.419793] ret_from_fork+0x24/0x30 [ 1002.423755] Kernel Offset: disabled [ 1002.427371] Rebooting in 86400 seconds..