[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ 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 '10.128.0.34' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 1001.322715] INFO: task syz-executor107:7984 blocked for more than 140 seconds. [ 1001.330299] Not tainted 4.14.301-syzkaller #0 [ 1001.337003] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.345737] syz-executor107 D28376 7984 7982 0x00000004 [ 1001.351401] Call Trace: [ 1001.354950] __schedule+0x88b/0x1de0 [ 1001.358761] ? lock_acquire+0x170/0x3f0 [ 1001.363431] ? io_schedule_timeout+0x140/0x140 [ 1001.368005] ? _raw_spin_unlock+0x29/0x40 [ 1001.372177] ? fuse_writepage_locked+0xe80/0xe80 [ 1001.378460] schedule+0x8d/0x1b0 [ 1001.381842] fuse_wait_on_page_writeback.isra.0+0xdc/0x120 [ 1001.388209] ? fuse_do_ioctl+0x1570/0x1570 [ 1001.392982] ? end_page_writeback+0xe3/0x1c0 [ 1001.397516] ? wait_woken+0x230/0x230 [ 1001.401310] fuse_launder_page+0xa2/0xd0 [ 1001.406388] invalidate_inode_pages2_range+0x547/0xc00 [ 1001.411691] ? clear_shadow_entry+0x160/0x160 [ 1001.417164] ? fuse_range_is_writeback+0x1f0/0x1f0 [ 1001.422130] ? fuse_file_alloc+0x1ca/0x260 [ 1001.427057] ? _raw_spin_unlock+0x29/0x40 [ 1001.431313] ? fuse_do_open+0x18e/0x460 [ 1001.436343] fuse_finish_open+0x262/0x500 [ 1001.440504] fuse_open_common+0x234/0x290 [ 1001.445580] do_dentry_open+0x44b/0xec0 [ 1001.449577] ? fuse_open_common+0x290/0x290 [ 1001.454554] ? __inode_permission+0xcd/0x2f0 [ 1001.459233] vfs_open+0x105/0x220 [ 1001.464508] path_openat+0x628/0x2970 [ 1001.468420] ? path_lookupat+0x780/0x780 [ 1001.473248] ? trace_hardirqs_on+0x10/0x10 [ 1001.477713] do_filp_open+0x179/0x3c0 [ 1001.481525] ? may_open_dev+0xe0/0xe0 [ 1001.486788] ? lock_downgrade+0x740/0x740 [ 1001.491853] ? do_raw_spin_unlock+0x164/0x220 [ 1001.497460] ? _raw_spin_unlock+0x29/0x40 [ 1001.501659] ? __alloc_fd+0x1be/0x490 [ 1001.506261] do_sys_open+0x296/0x410 [ 1001.510341] ? filp_open+0x60/0x60 [ 1001.514598] ? do_syscall_64+0x4c/0x640 [ 1001.518707] ? compat_SyS_openat+0x30/0x30 [ 1001.523888] do_syscall_64+0x1d5/0x640 [ 1001.528009] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 1001.535156] RIP: 0033:0x7fd253c684c9 [ 1001.540076] RSP: 002b:00007fd253c192f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 1001.548645] RAX: ffffffffffffffda RBX: 00007fd253cf94c0 RCX: 00007fd253c684c9 [ 1001.556683] RDX: 00007fd253c684c9 RSI: 0000000000000000 RDI: 00000000200001c0 [ 1001.564772] RBP: 00007fd253cc6164 R08: 0000000000000000 R09: 0000000000000000 [ 1001.572259] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 1001.580904] R13: 00007fd253cc2158 R14: 00007fd253cc4160 R15: 00007fd253cf94c8 [ 1001.588785] [ 1001.588785] Showing all locks held in the system: [ 1001.595843] 1 lock held by khungtaskd/1533: [ 1001.601373] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1001.610695] 2 locks held by syz-executor107/7984: [ 1001.615970] #0: (sb_writers#10){.+.+}, at: [] mnt_want_write+0x3a/0xb0 [ 1001.624992] #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] fuse_open_common+0x1a4/0x290 [ 1001.636115] [ 1001.637770] ============================================= [ 1001.637770] [ 1001.645707] NMI backtrace for cpu 1 [ 1001.649344] CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.301-syzkaller #0 [ 1001.656960] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 1001.666527] Call Trace: [ 1001.669108] dump_stack+0x1b2/0x281 [ 1001.672712] nmi_cpu_backtrace.cold+0x57/0x93 [ 1001.677361] ? irq_force_complete_move+0x350/0x350 [ 1001.682275] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 1001.687558] watchdog+0x5b9/0xb40 [ 1001.691141] ? hungtask_pm_notify+0x50/0x50 [ 1001.695449] kthread+0x30d/0x420 [ 1001.698793] ? kthread_create_on_node+0xd0/0xd0 [ 1001.703729] ret_from_fork+0x24/0x30 [ 1001.707592] Sending NMI from CPU 1 to CPUs 0: [ 1001.712583] NMI backtrace for cpu 0 [ 1001.712590] CPU: 0 PID: 4618 Comm: systemd-journal Not tainted 4.14.301-syzkaller #0 [ 1001.712595] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 1001.712598] task: ffff8880a1a226c0 task.stack: ffff8880a1a28000 [ 1001.712601] RIP: 0010:deref_stack_reg+0x28/0x1a0 [ 1001.712604] RSP: 0018:ffff8880a1a2f9e8 EFLAGS: 00000296 [ 1001.712609] RAX: dffffc0000000000 RBX: 1ffff11014345f53 RCX: ffffffff8a7271fe [ 1001.712613] RDX: ffff8880a1a2fb60 RSI: ffff8880a1a2fe00 RDI: ffff8880a1a2fb20 [ 1001.712616] RBP: ffff8880a1a2fe00 R08: 0000000000000001 R09: 0000000000000001 [ 1001.712620] R10: ffff8880a1a2fe30 R11: 0000000000000001 R12: ffff8880a1a2fb20 [ 1001.712623] R13: ffff8880a1a2fb60 R14: ffff8880a1a2fb70 R15: ffff8880a1a2fb20 [ 1001.712627] FS: 00007fcc50f8b8c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 1001.712630] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1001.712634] CR2: 00007fcc4e359000 CR3: 00000000a1eb5000 CR4: 00000000003406f0 [ 1001.712637] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1001.712641] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1001.712643] Call Trace: [ 1001.712646] ? __read_once_size_nocheck.constprop.0+0x10/0x10 [ 1001.712648] ? getname_flags+0xc8/0x550 [ 1001.712650] unwind_next_frame+0xfcc/0x17d0 [ 1001.712653] ? kmem_cache_alloc+0x124/0x3c0 [ 1001.712655] ? deref_stack_reg+0x1a0/0x1a0 [ 1001.712658] ? is_bpf_text_address+0xb8/0x150 [ 1001.712660] ? kernel_text_address+0xbd/0xf0 [ 1001.712662] ? kmem_cache_alloc+0x124/0x3c0 [ 1001.712665] __save_stack_trace+0x90/0x160 [ 1001.712667] ? getname_flags+0xc8/0x550 [ 1001.712670] kasan_kmalloc+0xeb/0x160 [ 1001.712672] ? kasan_kmalloc+0xeb/0x160 [ 1001.712674] ? kmem_cache_alloc+0x124/0x3c0 [ 1001.712677] ? getname_flags+0xc8/0x550 [ 1001.712679] ? SyS_mkdirat+0x83/0x270 [ 1001.712681] ? do_syscall_64+0x1d5/0x640 [ 1001.712684] ? entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 1001.712687] ? gfp_pfmemalloc_allowed+0x150/0x150 [ 1001.712690] ? entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 1001.712692] ? __put_seccomp_filter+0x90/0x90 [ 1001.712695] ? cache_alloc_refill+0x2fa/0x350 [ 1001.712697] ? lock_downgrade+0x740/0x740 [ 1001.712700] ? do_raw_spin_unlock+0x164/0x220 [ 1001.712702] ? _raw_spin_unlock+0x29/0x40 [ 1001.712704] ? cache_alloc_refill+0x2fa/0x350 [ 1001.712707] ? kmem_cache_alloc+0x2c8/0x3c0 [ 1001.712709] kmem_cache_alloc+0x124/0x3c0 [ 1001.712711] getname_flags+0xc8/0x550 [ 1001.712714] SyS_mkdirat+0x83/0x270 [ 1001.712716] ? SyS_mknod+0x30/0x30 [ 1001.712718] ? do_syscall_64+0x4c/0x640 [ 1001.712720] ? SyS_mkdirat+0x270/0x270 [ 1001.712723] do_syscall_64+0x1d5/0x640 [ 1001.712725] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 1001.712728] RIP: 0033:0x7fcc50246687 [ 1001.712730] RSP: 002b:00007fff39454918 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 [ 1001.712736] RAX: ffffffffffffffda RBX: 00007fff39457980 RCX: 00007fcc50246687 [ 1001.712740] RDX: 0000000000000000 RSI: 00000000000001ed RDI: 00005570138378a0 [ 1001.712744] RBP: 00007fff39454950 R08: 0000557012eb33e5 R09: 0000000000000018 [ 1001.712747] R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 [ 1001.712751] R13: 0000000000000001 R14: 00005570138378a0 R15: 00007fff39454f90 [ 1001.712753] Code: 00 00 00 48 b8 00 00 00 00 00 fc ff df 41 56 41 55 49 89 d5 41 54 49 89 fc 55 48 89 f5 53 48 83 ec 48 48 c7 44 24 08 b3 8a b5 41 <48> 8d 5c 24 08 48 c7 44 24 10 c0 94 b5 88 48 c1 eb 03 48 c7 44 [ 1001.713094] Kernel panic - not syncing: hung_task: blocked tasks [ 1002.058947] CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.301-syzkaller #0 [ 1002.066383] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 1002.075748] Call Trace: [ 1002.078324] dump_stack+0x1b2/0x281 [ 1002.081938] panic+0x1f9/0x42d [ 1002.085104] ? add_taint.cold+0x16/0x16 [ 1002.089082] ? printk_safe_flush+0xa9/0x110 [ 1002.093824] watchdog+0x5ca/0xb40 [ 1002.097280] ? hungtask_pm_notify+0x50/0x50 [ 1002.101607] kthread+0x30d/0x420 [ 1002.104974] ? kthread_create_on_node+0xd0/0xd0 [ 1002.109721] ret_from_fork+0x24/0x30 [ 1002.113787] Kernel Offset: disabled [ 1002.118312] Rebooting in 86400 seconds..