[ 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 '10.128.1.21' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 717.877104] INFO: task syz-executor275:8112 blocked for more than 140 seconds. [ 717.877116] Not tainted 4.19.211-syzkaller #0 [ 717.877120] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.877125] syz-executor275 D27336 8112 8110 0x00000004 [ 717.903723] Call Trace: [ 717.906300] __schedule+0x887/0x2040 [ 717.910068] ? io_schedule_timeout+0x140/0x140 [ 717.914663] ? _raw_spin_unlock+0x29/0x40 [ 717.918882] schedule+0x8d/0x1b0 [ 717.922255] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 [ 717.928022] ? fuse_do_ioctl+0x1850/0x1850 [ 717.932264] ? wait_woken+0x250/0x250 [ 717.936053] ? fuse_writepage_locked+0xb63/0x1010 [ 717.941070] ? fuse_writepage_locked+0x1010/0x1010 [ 717.946045] fuse_launder_page+0xb6/0xe0 [ 717.950172] invalidate_inode_pages2_range+0x795/0x1110 [ 717.955549] ? clear_shadow_entry+0x170/0x170 [ 717.960113] ? fuse_file_alloc+0x1d9/0x270 [ 717.964366] ? do_raw_spin_unlock+0x171/0x230 [ 717.968938] ? _raw_spin_unlock+0x29/0x40 [ 717.973098] ? fuse_do_open+0x1c4/0x500 [ 717.977153] fuse_finish_open+0x2e2/0x590 [ 717.981304] fuse_open_common+0x254/0x2c0 [ 717.985440] do_dentry_open+0x4aa/0x1160 [ 717.989572] ? fuse_open_common+0x2c0/0x2c0 [ 717.993898] ? inode_permission.part.0+0x10c/0x450 [ 717.998922] ? chown_common+0x550/0x550 [ 718.002913] ? inode_permission+0x3d/0x140 [ 718.007223] path_openat+0x793/0x2df0 [ 718.011041] ? path_lookupat+0x8d0/0x8d0 [ 718.015094] ? mark_held_locks+0xf0/0xf0 [ 718.019227] ? mark_held_locks+0xf0/0xf0 [ 718.023301] do_filp_open+0x18c/0x3f0 [ 718.027185] ? may_open_dev+0xf0/0xf0 [ 718.031000] ? lock_downgrade+0x720/0x720 [ 718.035142] ? lock_acquire+0x170/0x3c0 [ 718.039190] ? __alloc_fd+0x34/0x570 [ 718.042911] ? do_raw_spin_unlock+0x171/0x230 [ 718.047478] ? _raw_spin_unlock+0x29/0x40 [ 718.051632] ? __alloc_fd+0x28d/0x570 [ 718.055420] do_sys_open+0x3b3/0x520 [ 718.059193] ? filp_open+0x70/0x70 [ 718.062739] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 718.068170] ? trace_hardirqs_off_caller+0x6e/0x210 [ 718.073196] ? do_syscall_64+0x21/0x620 [ 718.077761] do_syscall_64+0xf9/0x620 [ 718.081561] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.086732] RIP: 0033:0x7f0b271b04c9 [ 718.090495] Code: Bad RIP value. [ 718.093858] RSP: 002b:00007f0b271612f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 718.101638] RAX: ffffffffffffffda RBX: 00007f0b272414c0 RCX: 00007f0b271b04c9 [ 718.108976] RDX: 00007f0b271b04c9 RSI: 0000000000000000 RDI: 00000000200001c0 [ 718.116978] RBP: 00007f0b2720e164 R08: 0000000000000000 R09: 0000000000000000 [ 718.124251] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 718.131589] R13: 00007f0b2720a158 R14: 00007f0b2720c160 R15: 00007f0b272414c8 [ 718.138972] [ 718.138972] Showing all locks held in the system: [ 718.145294] 1 lock held by khungtaskd/1571: [ 718.149678] #0: 0000000079fa704b (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 718.158404] 1 lock held by in:imklog/7814: [ 718.162623] #0: 00000000d6816124 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 718.170658] 2 locks held by syz-executor275/8112: [ 718.175493] #0: 00000000f1f4c89e (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 [ 718.183551] #1: 00000000a5efd26a (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 [ 718.193173] [ 718.194789] ============================================= [ 718.194789] [ 718.201869] NMI backtrace for cpu 0 [ 718.205497] CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.212930] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 [ 718.222265] Call Trace: [ 718.224839] dump_stack+0x1fc/0x2ef [ 718.228457] nmi_cpu_backtrace.cold+0x63/0xa2 [ 718.232936] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.237428] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 718.242712] watchdog+0x991/0xe60 [ 718.246156] ? reset_hung_task_detector+0x30/0x30 [ 718.250979] kthread+0x33f/0x460 [ 718.254323] ? kthread_park+0x180/0x180 [ 718.258282] ret_from_fork+0x24/0x30 [ 718.262077] Sending NMI from CPU 0 to CPUs 1: [ 718.267141] NMI backtrace for cpu 1 [ 718.267147] CPU: 1 PID: 4693 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 [ 718.267153] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 [ 718.267158] RIP: 0010:check_preemption_disabled+0x2/0x280 [ 718.267168] Code: b4 45 21 fe e9 d5 f1 ff ff e8 2a 88 c0 fd 48 8b 3c 24 e8 81 44 21 fe e9 87 f7 ff ff 90 90 90 90 90 90 90 90 90 90 90 90 41 57 <41> 56 41 55 49 89 f5 41 54 55 48 89 fd 53 e8 6b 67 eb fd 65 44 8b [ 718.267173] RSP: 0018:ffff8880a0e077d8 EFLAGS: 00000293 [ 718.267181] RAX: ffff8880a0dfc5c0 RBX: ffff8880a0dfc5c0 RCX: 1ffffffff148be2c [ 718.267186] RDX: 0000000000000000 RSI: ffffffff88b3e0e0 RDI: ffffffff88b3e120 [ 718.267191] RBP: ffff8880a0e07ce0 R08: 0000000000000000 R09: 0000000000000000 [ 718.267196] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 [ 718.267201] R13: 1ffff110141c0f1e R14: ffff88809a2ba8b0 R15: ffff8880a0e079e0 [ 718.267207] FS: 00007f49c75ac8c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 718.267211] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 718.267216] CR2: 00007f49c497e000 CR3: 00000000a0eb3000 CR4: 00000000003406e0 [ 718.267221] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 718.267226] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 718.267229] Call Trace: [ 718.267232] rcu_is_watching+0x12/0xc0 [ 718.267236] rcu_read_lock_held+0xba/0x110 [ 718.267240] __d_lookup_rcu+0x3d7/0x6b0 [ 718.267244] ? __follow_mount_rcu+0x10a/0x6f0 [ 718.267247] lookup_fast+0x11b/0x1080 [ 718.267251] ? follow_managed+0xbc0/0xbc0 [ 718.267254] ? mark_held_locks+0xf0/0xf0 [ 718.267258] walk_component+0xde/0xda0 [ 718.267261] ? lookup_fast+0x1080/0x1080 [ 718.267265] ? lock_downgrade+0x720/0x720 [ 718.267269] ? generic_permission+0x116/0x4d0 [ 718.267272] ? security_inode_permission+0xc5/0xf0 [ 718.267277] ? inode_permission.part.0+0x10c/0x450 [ 718.267280] link_path_walk.part.0+0x901/0x1230 [ 718.267284] ? walk_component+0xda0/0xda0 [ 718.267288] ? percpu_counter_add_batch+0x126/0x180 [ 718.267291] path_openat+0x1db/0x2df0 [ 718.267295] ? path_lookupat+0x8d0/0x8d0 [ 718.267299] ? __put_seccomp_filter+0xa0/0xa0 [ 718.267302] ? mark_held_locks+0xf0/0xf0 [ 718.267306] do_filp_open+0x18c/0x3f0 [ 718.267309] ? may_open_dev+0xf0/0xf0 [ 718.267313] ? lock_downgrade+0x720/0x720 [ 718.267316] ? lock_acquire+0x170/0x3c0 [ 718.267320] ? __alloc_fd+0x34/0x570 [ 718.267324] ? do_raw_spin_unlock+0x171/0x230 [ 718.267327] ? _raw_spin_unlock+0x29/0x40 [ 718.267331] ? __alloc_fd+0x28d/0x570 [ 718.267334] do_sys_open+0x3b3/0x520 [ 718.267337] ? filp_open+0x70/0x70 [ 718.267342] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 718.267346] ? trace_hardirqs_off_caller+0x6e/0x210 [ 718.267349] ? do_syscall_64+0x21/0x620 [ 718.267353] do_syscall_64+0xf9/0x620 [ 718.267357] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.267360] RIP: 0033:0x7f49c6b3b840 [ 718.267371] Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 [ 718.267374] RSP: 002b:00007ffd12fb67a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 718.267383] RAX: ffffffffffffffda RBX: 00007ffd12fb6ab0 RCX: 00007f49c6b3b840 [ 718.267389] RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055735ba80870 [ 718.267394] RBP: 000000000000000d R08: 00007f49c6b25bb8 R09: 00000000ffffffff [ 718.267399] R10: 0000000000000110 R11: 0000000000000246 R12: 00000000ffffffff [ 718.267404] R13: 000055735ba7c040 R14: 00007ffd12fb6a70 R15: 000055735ba896c0 [ 718.267585] Kernel panic - not syncing: hung_task: blocked tasks [ 718.611928] CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.619352] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 [ 718.628700] Call Trace: [ 718.631304] dump_stack+0x1fc/0x2ef [ 718.634914] panic+0x26a/0x50e [ 718.638090] ? __warn_printk+0xf3/0xf3 [ 718.641959] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 718.647043] ? cpumask_next+0x3c/0x40 [ 718.650824] ? printk_safe_flush+0xd6/0x120 [ 718.655128] ? watchdog+0x991/0xe60 [ 718.658738] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.664171] watchdog+0x9a2/0xe60 [ 718.667609] ? reset_hung_task_detector+0x30/0x30 [ 718.672435] kthread+0x33f/0x460 [ 718.675783] ? kthread_park+0x180/0x180 [ 718.679742] ret_from_fork+0x24/0x30 [ 718.683622] Kernel Offset: disabled [ 718.687242] Rebooting in 86400 seconds..