[ OK ] Reached target Login Prompts. [ 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 '10.128.0.239' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 857.984833] INFO: task syz-executor280:8000 blocked for more than 140 seconds. [ 857.992315] Not tainted 4.14.298-syzkaller #0 [ 858.000038] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 858.011040] syz-executor280 D28696 8000 7995 0x00000004 [ 858.017050] Call Trace: [ 858.019631] __schedule+0x88b/0x1de0 [ 858.023421] ? lock_acquire+0x170/0x3f0 [ 858.028405] ? io_schedule_timeout+0x140/0x140 [ 858.032991] ? _raw_spin_unlock+0x29/0x40 [ 858.037869] ? fuse_writepage_locked+0xe80/0xe80 [ 858.042626] schedule+0x8d/0x1b0 [ 858.046633] fuse_wait_on_page_writeback.isra.0+0xdc/0x120 [ 858.052245] ? fuse_do_ioctl+0x1570/0x1570 [ 858.057034] ? end_page_writeback+0xe3/0x1c0 [ 858.061453] ? wait_woken+0x230/0x230 [ 858.065825] fuse_launder_page+0xa2/0xd0 [ 858.069876] invalidate_inode_pages2_range+0x547/0xc00 [ 858.075707] ? clear_shadow_entry+0x160/0x160 [ 858.080226] ? fuse_range_is_writeback+0x1f0/0x1f0 [ 858.085877] ? fuse_file_alloc+0x1ca/0x260 [ 858.090146] ? _raw_spin_unlock+0x29/0x40 [ 858.094279] ? fuse_do_open+0x18e/0x460 [ 858.099170] fuse_finish_open+0x262/0x500 [ 858.103457] fuse_open_common+0x234/0x290 [ 858.108930] do_dentry_open+0x44b/0xec0 [ 858.112898] ? fuse_open_common+0x290/0x290 [ 858.119301] ? __inode_permission+0xcd/0x2f0 [ 858.123699] vfs_open+0x105/0x220 [ 858.127840] path_openat+0x628/0x2970 [ 858.131777] ? path_lookupat+0x780/0x780 [ 858.136502] ? trace_hardirqs_on+0x10/0x10 [ 858.140742] do_filp_open+0x179/0x3c0 [ 858.145212] ? may_open_dev+0xe0/0xe0 [ 858.149015] ? lock_downgrade+0x740/0x740 [ 858.153159] ? do_raw_spin_unlock+0x164/0x220 [ 858.158401] ? _raw_spin_unlock+0x29/0x40 [ 858.163384] ? __alloc_fd+0x1be/0x490 [ 858.167731] do_sys_open+0x296/0x410 [ 858.171428] ? filp_open+0x60/0x60 [ 858.175533] ? do_syscall_64+0x4c/0x640 [ 858.179855] ? compat_SyS_openat+0x30/0x30 [ 858.184155] do_syscall_64+0x1d5/0x640 [ 858.188768] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 858.195517] [ 858.195517] Showing all locks held in the system: [ 858.201948] 1 lock held by khungtaskd/1532: [ 858.206372] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 858.215576] 1 lock held by in:imklog/7698: [ 858.219790] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 [ 858.228520] 2 locks held by syz-executor280/8000: [ 858.233345] #0: (sb_writers#10){.+.+}, at: [] mnt_want_write+0x3a/0xb0 [ 858.241836] #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] fuse_open_common+0x1a4/0x290 [ 858.251917] [ 858.253538] ============================================= [ 858.253538] [ 858.260966] NMI backtrace for cpu 0 [ 858.264599] CPU: 0 PID: 1532 Comm: khungtaskd Not tainted 4.14.298-syzkaller #0 [ 858.272041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 858.281546] Call Trace: [ 858.284119] dump_stack+0x1b2/0x281 [ 858.287724] nmi_cpu_backtrace.cold+0x57/0x93 [ 858.292194] ? irq_force_complete_move+0x350/0x350 [ 858.297097] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 858.302347] watchdog+0x5b9/0xb40 [ 858.305774] ? hungtask_pm_notify+0x50/0x50 [ 858.310085] kthread+0x30d/0x420 [ 858.313427] ? kthread_create_on_node+0xd0/0xd0 [ 858.318072] ret_from_fork+0x24/0x30 [ 858.321868] Sending NMI from CPU 0 to CPUs 1: [ 858.326814] NMI backtrace for cpu 1 [ 858.326818] CPU: 1 PID: 4623 Comm: systemd-journal Not tainted 4.14.298-syzkaller #0 [ 858.326823] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 858.326826] task: ffff8880a17e0100 task.stack: ffff8880a17e8000 [ 858.326829] RIP: 0010:__sanitizer_cov_trace_pc+0x23/0x50 [ 858.326831] RSP: 0018:ffff8880a17efa40 EFLAGS: 00000246 [ 858.326836] RAX: ffff8880a17e0100 RBX: dffffc0000000000 RCX: ffff8880a17efe68 [ 858.326840] RDX: 0000000000000000 RSI: ffffc90001a80030 RDI: ffffffff878f1bc8 [ 858.326843] RBP: ffff8880a17efb58 R08: 0000000000000000 R09: 0000000000000000 [ 858.326847] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff878f16a0 [ 858.326850] R13: 1ffff110142fdf50 R14: ffffc90001a80068 R15: 00000000000000a5 [ 858.326854] FS: 00007f6954eaa8c0(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 858.326857] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 858.326860] CR2: 00007f6952276000 CR3: 00000000a109f000 CR4: 00000000003406e0 [ 858.326864] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 858.326867] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 858.326869] Call Trace: [ 858.326871] ___bpf_prog_run+0x1995/0x5630 [ 858.326874] ? unwind_next_frame+0x404/0x17d0 [ 858.326876] ? bpf_jit_compile+0x30/0x30 [ 858.326879] ? __bpf_prog_run32+0x7c/0xa0 [ 858.326881] ? __bpf_prog_run64+0xb0/0xb0 [ 858.326883] ? __save_stack_trace+0x90/0x160 [ 858.326886] ? kasan_slab_free+0x12d/0x1a0 [ 858.326888] ? seccomp_run_filters+0xfb/0x540 [ 858.326891] ? __put_seccomp_filter+0x90/0x90 [ 858.326893] ? debug_check_no_obj_freed+0x2c0/0x680 [ 858.326896] ? __lock_acquire+0x5fc/0x3f20 [ 858.326898] ? __seccomp_filter+0x7e/0xdd0 [ 858.326900] ? seccomp_send_sigsys+0x180/0x180 [ 858.326903] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 858.326906] ? debug_check_no_obj_freed+0x2c0/0x680 [ 858.326908] ? trace_hardirqs_on+0x10/0x10 [ 858.326910] ? putname+0xcd/0x110 [ 858.326913] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 858.326915] ? __secure_computing+0x1f6/0x450 [ 858.326918] ? syscall_trace_enter+0x359/0xc20 [ 858.326920] ? syscall_slow_exit_work+0x560/0x560 [ 858.326923] ? do_syscall_64+0x4c/0x640 [ 858.326925] ? do_syscall_64+0x41b/0x640 [ 858.326928] ? entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 858.326929] Code: 90 90 90 90 90 90 90 90 65 48 8b 04 25 c0 7f 02 00 48 85 c0 74 1a 65 8b 15 7b 27 ad 7e 81 e2 00 01 1f 00 75 0b 8b 90 58 13 00 00 <83> fa 01 74 01 c3 48 8b 34 24 48 8b 88 60 13 00 00 8b 80 5c 13 [ 858.327490] Kernel panic - not syncing: hung_task: blocked tasks [ 858.571763] CPU: 0 PID: 1532 Comm: khungtaskd Not tainted 4.14.298-syzkaller #0 [ 858.579443] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 858.588780] Call Trace: [ 858.591697] dump_stack+0x1b2/0x281 [ 858.595302] panic+0x1f9/0x42d [ 858.598479] ? add_taint.cold+0x16/0x16 [ 858.602439] ? printk_safe_flush+0xa9/0x110 [ 858.606735] watchdog+0x5ca/0xb40 [ 858.610161] ? hungtask_pm_notify+0x50/0x50 [ 858.614456] kthread+0x30d/0x420 [ 858.617795] ? kthread_create_on_node+0xd0/0xd0 [ 858.623219] ret_from_fork+0x24/0x30 [ 858.627153] Kernel Offset: disabled [ 858.630761] Rebooting in 86400 seconds..