[ 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 '10.128.0.236' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 717.830562] INFO: task syz-executor361:8100 blocked for more than 140 seconds. [ 717.838096] Not tainted 4.19.211-syzkaller #0 [ 717.843372] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.851446] syz-executor361 D27368 8100 8098 0x00000004 [ 717.857073] Call Trace: [ 717.859649] __schedule+0x887/0x2040 [ 717.863509] ? io_schedule_timeout+0x140/0x140 [ 717.868104] ? _raw_spin_unlock+0x29/0x40 [ 717.872332] schedule+0x8d/0x1b0 [ 717.875700] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 [ 717.881510] ? fuse_do_ioctl+0x1850/0x1850 [ 717.885777] ? wait_woken+0x250/0x250 [ 717.889585] ? fuse_writepage_locked+0xb63/0x1010 [ 717.894497] ? fuse_writepage_locked+0x1010/0x1010 [ 717.899429] fuse_launder_page+0xb6/0xe0 [ 717.903561] invalidate_inode_pages2_range+0x795/0x1110 [ 717.908942] ? clear_shadow_entry+0x170/0x170 [ 717.913510] ? fuse_file_alloc+0x1d9/0x270 [ 717.917767] ? do_raw_spin_unlock+0x171/0x230 [ 717.922337] ? _raw_spin_unlock+0x29/0x40 [ 717.926491] ? fuse_do_open+0x1c4/0x500 [ 717.930546] fuse_finish_open+0x2e2/0x590 [ 717.934722] fuse_open_common+0x254/0x2c0 [ 717.938855] do_dentry_open+0x4aa/0x1160 [ 717.942988] ? fuse_open_common+0x2c0/0x2c0 [ 717.947314] ? inode_permission.part.0+0x10c/0x450 [ 717.952311] ? chown_common+0x550/0x550 [ 717.956287] ? inode_permission+0x3d/0x140 [ 717.960601] path_openat+0x793/0x2df0 [ 717.964404] ? path_lookupat+0x8d0/0x8d0 [ 717.968452] ? mark_held_locks+0xf0/0xf0 [ 717.972591] do_filp_open+0x18c/0x3f0 [ 717.976397] ? may_open_dev+0xf0/0xf0 [ 717.980188] ? lock_downgrade+0x720/0x720 [ 717.984490] ? lock_acquire+0x170/0x3c0 [ 717.988467] ? __alloc_fd+0x34/0x570 [ 717.992256] ? do_raw_spin_unlock+0x171/0x230 [ 717.996750] ? _raw_spin_unlock+0x29/0x40 [ 718.000964] ? __alloc_fd+0x28d/0x570 [ 718.004775] do_sys_open+0x3b3/0x520 [ 718.008475] ? filp_open+0x70/0x70 [ 718.012087] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 718.017470] ? trace_hardirqs_off_caller+0x6e/0x210 [ 718.022686] ? do_syscall_64+0x21/0x620 [ 718.026668] do_syscall_64+0xf9/0x620 [ 718.030542] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.035735] RIP: 0033:0x7f79260254c9 [ 718.039434] Code: Bad RIP value. [ 718.042847] RSP: 002b:00007f7925fd62f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 718.050639] RAX: ffffffffffffffda RBX: 00007f79260b64c0 RCX: 00007f79260254c9 [ 718.057904] RDX: 00007f79260254c9 RSI: 0000000000000000 RDI: 00000000200001c0 [ 718.065225] RBP: 00007f7926083164 R08: 0000000000000000 R09: 0000000000000000 [ 718.072624] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 718.079905] R13: 00007f792607f158 R14: 00007f7926081160 R15: 00007f79260b64c8 [ 718.087262] [ 718.087262] Showing all locks held in the system: [ 718.093669] 1 lock held by khungtaskd/1491: [ 718.097973] #0: 000000006cbb0dc9 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 718.106645] 1 lock held by in:imklog/7706: [ 718.110940] #0: 000000006afecc22 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 718.118918] 2 locks held by syz-executor361/8100: [ 718.123812] #0: 000000005d8f4a9e (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 [ 718.131880] #1: 00000000448ff3bb (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 [ 718.142311] [ 718.143937] ============================================= [ 718.143937] [ 718.151338] NMI backtrace for cpu 1 [ 718.154972] CPU: 1 PID: 1491 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.162398] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 [ 718.171733] Call Trace: [ 718.174304] dump_stack+0x1fc/0x2ef [ 718.177918] nmi_cpu_backtrace.cold+0x63/0xa2 [ 718.182484] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.186958] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 718.192223] watchdog+0x991/0xe60 [ 718.195659] ? reset_hung_task_detector+0x30/0x30 [ 718.200481] kthread+0x33f/0x460 [ 718.203827] ? kthread_park+0x180/0x180 [ 718.207875] ret_from_fork+0x24/0x30 [ 718.211675] Sending NMI from CPU 1 to CPUs 0: [ 718.216901] NMI backtrace for cpu 0 [ 718.216907] CPU: 0 PID: 4691 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 [ 718.216913] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 [ 718.216917] RIP: 0010:check_memory_region+0xb0/0x170 [ 718.216928] Code: c0 08 48 39 d0 74 7b 48 83 38 00 74 f1 48 8d 50 08 eb 09 48 83 c0 01 48 39 d0 74 0e 80 38 00 74 f2 48 85 c0 0f 85 9c 00 00 00 <5b> 5d 41 5c c3 48 85 d2 74 f6 48 01 ea eb 09 48 83 c0 01 48 39 d0 [ 718.216933] RSP: 0018:ffff8880a0c9f728 EFLAGS: 00000046 [ 718.216941] RAX: fffffbfff19abed8 RBX: fffffbfff19abed8 RCX: ffffffff814afa31 [ 718.216946] RDX: fffffbfff19abed8 RSI: 0000000000000004 RDI: ffffffff8cd5f6b8 [ 718.216951] RBP: fffffbfff19abed7 R08: 0000000000000001 R09: fffffbfff19abed7 [ 718.216956] R10: ffffffff8cd5f6bb R11: 0000000000000009 R12: 0000000000000001 [ 718.216961] R13: ffff8880a0c90540 R14: ffffffff8d38d5a0 R15: 0000000000000001 [ 718.216966] FS: 00007f4ec5ce08c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 718.216971] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 718.216976] CR2: 00007f4ec30b1000 CR3: 00000000a137e000 CR4: 00000000003406f0 [ 718.216981] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 718.216986] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 718.216989] Call Trace: [ 718.216992] __lock_acquire+0x251/0x3ff0 [ 718.216996] ? mark_held_locks+0xf0/0xf0 [ 718.216999] ? mark_held_locks+0xf0/0xf0 [ 718.217003] ? __lock_acquire+0x6de/0x3ff0 [ 718.217006] ? mark_held_locks+0xf0/0xf0 [ 718.217010] ? __read_once_size_nocheck.constprop.0+0x10/0x10 [ 718.217014] ? get_page_from_freelist+0x1d60/0x4170 [ 718.217018] ? free_one_page+0x12b/0x10b0 [ 718.217021] ? lock_downgrade+0x720/0x720 [ 718.217025] ? free_one_page+0x12b/0x10b0 [ 718.217028] lock_acquire+0x170/0x3c0 [ 718.217032] ? debug_check_no_obj_freed+0xb5/0x490 [ 718.217036] _raw_spin_lock_irqsave+0x8c/0xc0 [ 718.217040] ? debug_check_no_obj_freed+0xb5/0x490 [ 718.217043] debug_check_no_obj_freed+0xb5/0x490 [ 718.217047] __free_pages_ok+0x22d/0xd30 [ 718.217050] slabs_destroy+0x90/0xd0 [ 718.217054] ___cache_free+0x295/0x3a0 [ 718.217057] qlist_free_all+0x79/0x140 [ 718.217060] quarantine_reduce+0x1a9/0x230 [ 718.217064] kasan_kmalloc+0xa2/0x160 [ 718.217067] ? mark_held_locks+0xf0/0xf0 [ 718.217071] ? gfp_pfmemalloc_allowed+0x150/0x150 [ 718.217075] ? __put_seccomp_filter+0xa0/0xa0 [ 718.217078] ? kmem_cache_free+0x7f/0x260 [ 718.217082] ? __put_cred+0x1de/0x250 [ 718.217085] ? do_faccessat+0x64e/0x7a0 [ 718.217088] ? do_syscall_64+0xf9/0x620 [ 718.217092] ? mark_held_locks+0xf0/0xf0 [ 718.217095] ? kmem_cache_free+0x226/0x260 [ 718.217099] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 718.217103] ? cache_alloc_refill+0x2f8/0x340 [ 718.217106] ? lock_downgrade+0x720/0x720 [ 718.217109] ? do_raw_spin_lock+0xcb/0x220 [ 718.217113] ? do_raw_spin_unlock+0x171/0x230 [ 718.217117] ? _raw_spin_unlock+0x29/0x40 [ 718.217120] ? cache_alloc_refill+0x2f8/0x340 [ 718.217124] ? kmem_cache_alloc+0x2b1/0x370 [ 718.217127] kmem_cache_alloc+0x110/0x370 [ 718.217131] getname_flags+0xce/0x590 [ 718.217134] do_mkdirat+0x8d/0x2d0 [ 718.217138] ? __ia32_sys_mknod+0x120/0x120 [ 718.217142] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 718.217146] ? trace_hardirqs_off_caller+0x6e/0x210 [ 718.217149] ? do_syscall_64+0x21/0x620 [ 718.217152] do_syscall_64+0xf9/0x620 [ 718.217156] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.217159] RIP: 0033:0x7f4ec4f9b687 [ 718.217170] Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 [ 718.217174] RSP: 002b:00007ffdd79e9b68 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 [ 718.217182] RAX: ffffffffffffffda RBX: 00007ffdd79ecbd0 RCX: 00007f4ec4f9b687 [ 718.217186] RDX: 0000000000000000 RSI: 00000000000001ed RDI: 0000564c2f76d8a0 [ 718.217190] RBP: 00007ffdd79e9ba0 R08: 0000564c2f4ad3e5 R09: 0000000000000018 [ 718.217194] R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 [ 718.217198] R13: 0000000000000001 R14: 0000564c2f76d8a0 R15: 00007ffdd79ea1e0 [ 718.217208] Kernel panic - not syncing: hung_task: blocked tasks [ 718.217224] CPU: 1 PID: 1491 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.625782] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 [ 718.635115] Call Trace: [ 718.637691] dump_stack+0x1fc/0x2ef [ 718.641306] panic+0x26a/0x50e [ 718.644478] ? __warn_printk+0xf3/0xf3 [ 718.648435] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 718.653524] ? cpumask_next+0x3c/0x40 [ 718.657308] ? printk_safe_flush+0xd6/0x120 [ 718.661614] ? watchdog+0x991/0xe60 [ 718.665221] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.670662] watchdog+0x9a2/0xe60 [ 718.674097] ? reset_hung_task_detector+0x30/0x30 [ 718.678925] kthread+0x33f/0x460 [ 718.682273] ? kthread_park+0x180/0x180 [ 718.686228] ret_from_fork+0x24/0x30 [ 718.690216] Kernel Offset: disabled [ 718.693834] Rebooting in 86400 seconds..