[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.36' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 717.591058] INFO: task syz-executor651:8113 blocked for more than 140 seconds. [ 717.598485] Not tainted 4.19.211-syzkaller #0 [ 717.604696] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.612898] syz-executor651 D27840 8113 8111 0x00000004 [ 717.618521] Call Trace: [ 717.621409] __schedule+0x887/0x2040 [ 717.625134] ? io_schedule_timeout+0x140/0x140 [ 717.629700] ? _raw_spin_unlock+0x29/0x40 [ 717.634177] schedule+0x8d/0x1b0 [ 717.637551] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 [ 717.643581] ? fuse_do_ioctl+0x1850/0x1850 [ 717.647814] ? wait_woken+0x250/0x250 [ 717.651901] ? fuse_writepage_locked+0xb63/0x1010 [ 717.656745] ? fuse_writepage_locked+0x1010/0x1010 [ 717.661948] fuse_launder_page+0xb6/0xe0 [ 717.666006] invalidate_inode_pages2_range+0x795/0x1110 [ 717.671662] ? clear_shadow_entry+0x170/0x170 [ 717.676158] ? fuse_file_alloc+0x1d9/0x270 [ 717.680379] ? do_raw_spin_unlock+0x171/0x230 [ 717.685390] ? _raw_spin_unlock+0x29/0x40 [ 717.689540] ? fuse_do_open+0x1c4/0x500 [ 717.693800] fuse_finish_open+0x2e2/0x590 [ 717.697949] fuse_open_common+0x254/0x2c0 [ 717.702460] do_dentry_open+0x4aa/0x1160 [ 717.706524] ? fuse_open_common+0x2c0/0x2c0 [ 717.710829] ? inode_permission.part.0+0x10c/0x450 [ 717.716114] ? chown_common+0x550/0x550 [ 717.720101] ? inode_permission+0x3d/0x140 [ 717.724606] path_openat+0x793/0x2df0 [ 717.728410] ? path_lookupat+0x8d0/0x8d0 [ 717.732786] ? mark_held_locks+0xf0/0xf0 [ 717.736850] do_filp_open+0x18c/0x3f0 [ 717.740630] ? may_open_dev+0xf0/0xf0 [ 717.744706] ? lock_downgrade+0x720/0x720 [ 717.748853] ? lock_acquire+0x170/0x3c0 [ 717.753073] ? __alloc_fd+0x34/0x570 [ 717.756786] ? do_raw_spin_unlock+0x171/0x230 [ 717.761521] ? _raw_spin_unlock+0x29/0x40 [ 717.765666] ? __alloc_fd+0x28d/0x570 [ 717.769451] do_sys_open+0x3b3/0x520 [ 717.773420] ? filp_open+0x70/0x70 [ 717.776962] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 717.782601] ? trace_hardirqs_off_caller+0x6e/0x210 [ 717.787619] ? do_syscall_64+0x21/0x620 [ 717.791856] do_syscall_64+0xf9/0x620 [ 717.795659] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.800829] RIP: 0033:0x7f7cc29684c9 [ 717.804810] Code: Bad RIP value. [ 717.808174] RSP: 002b:00007f7cc29192f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 717.816154] RAX: ffffffffffffffda RBX: 00007f7cc29f94c0 RCX: 00007f7cc29684c9 [ 717.823612] RDX: 00007f7cc29684c9 RSI: 0000000000000000 RDI: 00000000200001c0 [ 717.830870] RBP: 00007f7cc29c6164 R08: 0000000000000000 R09: 0000000000000000 [ 717.838384] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 717.845842] R13: 00007f7cc29c2158 R14: 00007f7cc29c4160 R15: 00007f7cc29f94c8 [ 717.853371] [ 717.853371] Showing all locks held in the system: [ 717.859694] 1 lock held by khungtaskd/1567: [ 717.864268] #0: 00000000f4090836 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 717.873075] 1 lock held by in:imklog/7810: [ 717.877288] #0: 00000000611c176c (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 717.885533] 2 locks held by syz-executor651/8113: [ 717.890365] #0: 0000000067784d14 (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 [ 717.898591] #1: 0000000007d87100 (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 [ 717.908348] [ 717.909965] ============================================= [ 717.909965] [ 717.917656] NMI backtrace for cpu 1 [ 717.921346] CPU: 1 PID: 1567 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 717.928779] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 717.938114] Call Trace: [ 717.940690] dump_stack+0x1fc/0x2ef [ 717.944305] nmi_cpu_backtrace.cold+0x63/0xa2 [ 717.948782] ? lapic_can_unplug_cpu+0x80/0x80 [ 717.953256] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 717.958516] watchdog+0x991/0xe60 [ 717.961953] ? reset_hung_task_detector+0x30/0x30 [ 717.966775] kthread+0x33f/0x460 [ 717.970119] ? kthread_park+0x180/0x180 [ 717.974074] ret_from_fork+0x24/0x30 [ 717.977830] Sending NMI from CPU 1 to CPUs 0: [ 717.982719] NMI backtrace for cpu 0 [ 717.982725] CPU: 0 PID: 10 Comm: rcu_preempt Not tainted 4.19.211-syzkaller #0 [ 717.982731] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 717.982735] RIP: 0010:__sanitizer_cov_trace_pc+0xd/0x50 [ 717.982746] Code: ff 4c 89 ef e8 04 dd 35 00 e9 23 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 34 24 65 48 8b 04 25 c0 df 01 00 <65> 8b 15 cc 59 9f 7e 81 e2 00 01 1f 00 75 2b 8b 90 60 13 00 00 83 [ 717.982750] RSP: 0018:ffff8880b5a67bb8 EFLAGS: 00000093 [ 717.982758] RAX: ffff8880b5a4e280 RBX: 0000000000000000 RCX: ffffffff8167a97c [ 717.982763] RDX: 0000000000000000 RSI: ffffffff8167a9bb RDI: 0000000000000005 [ 717.982767] RBP: ffffffff8d3b9088 R08: 0000000000000000 R09: 0000000000000000 [ 717.982772] R10: 0000000000000005 R11: 0000000000000000 R12: ffffffff8d3b9080 [ 717.982777] R13: ffffffff881950e9 R14: ffff8880b5a67cc0 R15: ffffffff8d3b9088 [ 717.982783] FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 717.982787] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 717.982792] CR2: 00007fc9b2057000 CR3: 00000000a1fdf000 CR4: 00000000003406f0 [ 717.982797] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 717.982802] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 717.982805] Call Trace: [ 717.982808] trace_hardirqs_on+0x7b/0x210 [ 717.982812] _raw_spin_unlock_irqrestore+0x79/0xe0 [ 717.982815] debug_object_free+0x1c4/0x380 [ 717.982819] schedule_timeout+0x4e6/0xfe0 [ 717.982823] ? prepare_to_swait_event+0x5b/0x540 [ 717.982826] ? usleep_range+0x170/0x170 [ 717.982830] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 717.982833] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 717.982837] ? collect_expired_timers+0x2a0/0x2a0 [ 717.982841] ? swake_up_all+0x340/0x340 [ 717.982844] rcu_gp_kthread+0xdad/0x21c0 [ 717.982847] ? lock_acquire+0x170/0x3c0 [ 717.982851] ? __rcu_read_unlock+0x160/0x160 [ 717.982855] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 717.982858] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 717.982862] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 717.982866] ? __kthread_parkme+0x133/0x1e0 [ 717.982869] ? __rcu_read_unlock+0x160/0x160 [ 717.982873] kthread+0x33f/0x460 [ 717.982876] ? kthread_park+0x180/0x180 [ 717.982879] ret_from_fork+0x24/0x30 [ 717.983386] Kernel panic - not syncing: hung_task: blocked tasks [ 718.204634] CPU: 1 PID: 1567 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.212061] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 718.221391] Call Trace: [ 718.223964] dump_stack+0x1fc/0x2ef [ 718.227578] panic+0x26a/0x50e [ 718.230756] ? __warn_printk+0xf3/0xf3 [ 718.234631] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.239107] ? ___preempt_schedule+0x16/0x18 [ 718.243500] ? watchdog+0x991/0xe60 [ 718.247107] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.252537] watchdog+0x9a2/0xe60 [ 718.255972] ? reset_hung_task_detector+0x30/0x30 [ 718.260798] kthread+0x33f/0x460 [ 718.264159] ? kthread_park+0x180/0x180 [ 718.268121] ret_from_fork+0x24/0x30 [ 718.272083] Kernel Offset: disabled [ 718.275704] Rebooting in 86400 seconds..