[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.49' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 717.777944] INFO: task syz-executor263:8118 blocked for more than 140 seconds. [ 717.785410] Not tainted 4.19.211-syzkaller #0 [ 717.791447] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.799865] syz-executor263 D28248 8118 8113 0x00000004 [ 717.805493] Call Trace: [ 717.808148] __schedule+0x887/0x2040 [ 717.811866] ? io_schedule_timeout+0x140/0x140 [ 717.816433] ? _raw_spin_unlock+0x29/0x40 [ 717.820621] schedule+0x8d/0x1b0 [ 717.823990] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 [ 717.829765] ? fuse_do_ioctl+0x1850/0x1850 [ 717.833996] ? wait_woken+0x250/0x250 [ 717.837847] ? fuse_writepage_locked+0xb63/0x1010 [ 717.842687] ? fuse_writepage_locked+0x1010/0x1010 [ 717.847601] fuse_launder_page+0xb6/0xe0 [ 717.851728] invalidate_inode_pages2_range+0x795/0x1110 [ 717.857097] ? clear_shadow_entry+0x170/0x170 [ 717.861653] ? fuse_file_alloc+0x1d9/0x270 [ 717.865894] ? do_raw_spin_unlock+0x171/0x230 [ 717.870450] ? _raw_spin_unlock+0x29/0x40 [ 717.874593] ? fuse_do_open+0x1c4/0x500 [ 717.878617] fuse_finish_open+0x2e2/0x590 [ 717.882765] fuse_open_common+0x254/0x2c0 [ 717.886899] do_dentry_open+0x4aa/0x1160 [ 717.891018] ? fuse_open_common+0x2c0/0x2c0 [ 717.895346] ? inode_permission.part.0+0x10c/0x450 [ 717.900316] ? chown_common+0x550/0x550 [ 717.904293] ? inode_permission+0x3d/0x140 [ 717.908589] path_openat+0x793/0x2df0 [ 717.912389] ? path_lookupat+0x8d0/0x8d0 [ 717.916436] ? mark_held_locks+0xf0/0xf0 [ 717.920545] do_filp_open+0x18c/0x3f0 [ 717.924346] ? may_open_dev+0xf0/0xf0 [ 717.928211] ? lock_downgrade+0x720/0x720 [ 717.932355] ? lock_acquire+0x170/0x3c0 [ 717.936313] ? __alloc_fd+0x34/0x570 [ 717.940068] ? do_raw_spin_unlock+0x171/0x230 [ 717.944566] ? _raw_spin_unlock+0x29/0x40 [ 717.948766] ? __alloc_fd+0x28d/0x570 [ 717.952574] do_sys_open+0x3b3/0x520 [ 717.956296] ? filp_open+0x70/0x70 [ 717.959883] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 717.965252] ? trace_hardirqs_off_caller+0x6e/0x210 [ 717.970336] ? do_syscall_64+0x21/0x620 [ 717.974304] do_syscall_64+0xf9/0x620 [ 717.978154] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.983341] RIP: 0033:0x7f94d11045f9 [ 717.987040] Code: Bad RIP value. [ 717.990457] RSP: 002b:00007f94d10942f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 717.998217] RAX: ffffffffffffffda RBX: 00007f94d11974d0 RCX: 00007f94d11045f9 [ 718.005478] RDX: 00007f94d11045f9 RSI: 0000000000000000 RDI: 00000000200001c0 [ 718.012933] RBP: 00007f94d116416c R08: 0000000000000000 R09: 0000000000000000 [ 718.020302] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 718.027576] R13: 00007f94d1160160 R14: 00007f94d1162168 R15: 00007f94d11974d8 [ 718.034924] [ 718.034924] Showing all locks held in the system: [ 718.041313] 1 lock held by khungtaskd/1571: [ 718.045618] #0: 000000001bce5612 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 718.054316] 1 lock held by in:imklog/7821: [ 718.058594] #0: 0000000028d70d74 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 718.066576] 2 locks held by syz-executor263/8118: [ 718.071464] #0: 000000007e0b4575 (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 [ 718.079505] #1: 000000000b06e0e5 (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 [ 718.089112] [ 718.090736] ============================================= [ 718.090736] [ 718.098160] NMI backtrace for cpu 1 [ 718.101788] CPU: 1 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.109213] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 718.118548] Call Trace: [ 718.121121] dump_stack+0x1fc/0x2ef [ 718.124730] nmi_cpu_backtrace.cold+0x63/0xa2 [ 718.129208] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.133687] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 718.138949] watchdog+0x991/0xe60 [ 718.142386] ? reset_hung_task_detector+0x30/0x30 [ 718.148170] kthread+0x33f/0x460 [ 718.151529] ? kthread_park+0x180/0x180 [ 718.155507] ret_from_fork+0x24/0x30 [ 718.159303] Sending NMI from CPU 1 to CPUs 0: [ 718.164145] NMI backtrace for cpu 0 [ 718.164151] CPU: 0 PID: 4693 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 [ 718.164157] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 718.164162] RIP: 0010:__sanitizer_cov_trace_pc+0x22/0x50 [ 718.164172] Code: 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> fa 02 75 20 48 8b 88 68 13 00 00 8b 80 64 13 00 00 48 8b 11 48 [ 718.164177] RSP: 0018:ffff8880a0f0fe88 EFLAGS: 00000246 [ 718.164185] RAX: ffff8880a0f005c0 RBX: 0000000000000001 RCX: ffffffff83771e23 [ 718.164190] RDX: 0000000000000000 RSI: ffffffff83771e2c RDI: 0000000000000005 [ 718.164202] RBP: ffffffff88b3e120 R08: 0000000000000000 R09: 0000000000000000 [ 718.164207] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000 [ 718.164212] R13: ffffffff88b3e0e0 R14: 0000000000000000 R15: 0000000000000000 [ 718.164218] FS: 00007f9fd73de8c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 718.164222] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 718.164227] CR2: 00007f9fd47af008 CR3: 00000000a16c5000 CR4: 00000000003406f0 [ 718.164232] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 718.164237] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 718.164240] Call Trace: [ 718.164244] check_preemption_disabled+0x3c/0x280 [ 718.164247] rcu_is_watching+0x12/0xc0 [ 718.164251] rcu_read_lock_held+0xba/0x110 [ 718.164254] __task_pid_nr_ns+0x422/0x4c0 [ 718.164258] __ia32_sys_getpid+0x1a/0x20 [ 718.164261] do_syscall_64+0xf9/0x620 [ 718.164265] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.164268] RIP: 0033:0x7f9fd6676f17 [ 718.164279] Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 [ 718.164283] RSP: 002b:00007fffee8e0a58 EFLAGS: 00000206 ORIG_RAX: 0000000000000027 [ 718.164291] RAX: ffffffffffffffda RBX: 0000560f4666e1e0 RCX: 00007f9fd6676f17 [ 718.164296] RDX: 00007fffee8e0b18 RSI: 0000000000000001 RDI: 0000560f4666e1e0 [ 718.164301] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 718.164306] R10: 0000000000000069 R11: 0000000000000206 R12: 00007fffee8e0b18 [ 718.164311] R13: 0000000000001255 R14: 00007fffee8e3900 R15: 00007fffee8e0f10 [ 718.164814] Kernel panic - not syncing: hung_task: blocked tasks [ 718.392351] CPU: 1 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.399775] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 718.409108] Call Trace: [ 718.411682] dump_stack+0x1fc/0x2ef [ 718.415295] panic+0x26a/0x50e [ 718.418469] ? __warn_printk+0xf3/0xf3 [ 718.422336] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 718.427423] ? cpumask_next+0x3c/0x40 [ 718.431201] ? printk_safe_flush+0xd6/0x120 [ 718.435505] ? watchdog+0x991/0xe60 [ 718.439127] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.444559] watchdog+0x9a2/0xe60 [ 718.447992] ? reset_hung_task_detector+0x30/0x30 [ 718.452815] kthread+0x33f/0x460 [ 718.456159] ? kthread_park+0x180/0x180 [ 718.460198] ret_from_fork+0x24/0x30 [ 718.464166] Kernel Offset: disabled [ 718.467791] Rebooting in 86400 seconds..