[ 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 '10.128.0.233' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 1001.324117] INFO: task syz-executor320:7990 blocked for more than 140 seconds. [ 1001.331570] Not tainted 4.14.291-syzkaller #0 [ 1001.337789] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.346107] syz-executor320 D28560 7990 7988 0x00000004 [ 1001.351720] Call Trace: [ 1001.354902] __schedule+0x88b/0x1de0 [ 1001.358629] ? lock_acquire+0x170/0x3f0 [ 1001.362580] ? io_schedule_timeout+0x140/0x140 [ 1001.367848] ? _raw_spin_unlock+0x29/0x40 [ 1001.372009] ? fuse_writepage_locked+0xe80/0xe80 [ 1001.377277] schedule+0x8d/0x1b0 [ 1001.380630] fuse_wait_on_page_writeback.isra.0+0xdc/0x120 [ 1001.386759] ? fuse_do_ioctl+0x1570/0x1570 [ 1001.391011] ? end_page_writeback+0xe3/0x1c0 [ 1001.395964] ? wait_woken+0x230/0x230 [ 1001.399751] fuse_launder_page+0xa2/0xd0 [ 1001.403816] invalidate_inode_pages2_range+0x547/0xc00 [ 1001.409825] ? clear_shadow_entry+0x160/0x160 [ 1001.414642] ? fuse_range_is_writeback+0x1f0/0x1f0 [ 1001.419552] ? fuse_file_alloc+0x1ca/0x260 [ 1001.423787] ? _raw_spin_unlock+0x29/0x40 [ 1001.428639] ? fuse_do_open+0x18e/0x460 [ 1001.432601] fuse_finish_open+0x262/0x500 [ 1001.437330] fuse_open_common+0x234/0x290 [ 1001.441529] do_dentry_open+0x44b/0xec0 [ 1001.445992] ? fuse_open_common+0x290/0x290 [ 1001.450315] ? __inode_permission+0xcd/0x2f0 [ 1001.455217] vfs_open+0x105/0x220 [ 1001.458665] path_openat+0x628/0x2970 [ 1001.462463] ? path_lookupat+0x780/0x780 [ 1001.467245] ? trace_hardirqs_on+0x10/0x10 [ 1001.471476] do_filp_open+0x179/0x3c0 [ 1001.475923] ? may_open_dev+0xe0/0xe0 [ 1001.479724] ? lock_downgrade+0x740/0x740 [ 1001.483956] ? do_raw_spin_unlock+0x164/0x220 [ 1001.489821] ? _raw_spin_unlock+0x29/0x40 [ 1001.493944] ? __alloc_fd+0x1be/0x490 [ 1001.498266] do_sys_open+0x296/0x410 [ 1001.501967] ? filp_open+0x60/0x60 [ 1001.506019] ? do_syscall_64+0x4c/0x640 [ 1001.509976] ? do_sys_open+0x410/0x410 [ 1001.513840] do_syscall_64+0x1d5/0x640 [ 1001.518435] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.523606] RIP: 0033:0x7f3d272564c9 [ 1001.527817] RSP: 002b:00007f3d272072f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 1001.535828] RAX: ffffffffffffffda RBX: 00007f3d272e74c0 RCX: 00007f3d272564c9 [ 1001.543080] RDX: 0000000000000000 RSI: 0000000000000600 RDI: 0000000020000100 [ 1001.550906] RBP: 00007f3d272b4164 R08: 0000000000000000 R09: 0000000000000000 [ 1001.558483] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 1001.566051] R13: 00007f3d272b0158 R14: 00007f3d272b2160 R15: 00007f3d272e74c8 [ 1001.573326] [ 1001.573326] Showing all locks held in the system: [ 1001.580150] 1 lock held by khungtaskd/1532: [ 1001.584574] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1001.593643] 1 lock held by in:imklog/7667: [ 1001.597967] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 [ 1001.606437] 2 locks held by syz-executor320/7990: [ 1001.611259] #0: (sb_writers#10){.+.+}, at: [] mnt_want_write+0x3a/0xb0 [ 1001.619839] #1: (&sb->s_type->i_mutex_key#17){+.+.}, at: [] fuse_open_common+0x1a4/0x290 [ 1001.629852] [ 1001.631461] ============================================= [ 1001.631461] [ 1001.638970] NMI backtrace for cpu 1 [ 1001.642589] CPU: 1 PID: 1532 Comm: khungtaskd Not tainted 4.14.291-syzkaller #0 [ 1001.650007] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 1001.659334] Call Trace: [ 1001.661901] dump_stack+0x1b2/0x281 [ 1001.665510] nmi_cpu_backtrace.cold+0x57/0x93 [ 1001.670007] ? irq_force_complete_move+0x350/0x350 [ 1001.674944] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 1001.680226] watchdog+0x5b9/0xb40 [ 1001.683653] ? hungtask_pm_notify+0x50/0x50 [ 1001.687971] kthread+0x30d/0x420 [ 1001.691315] ? kthread_create_on_node+0xd0/0xd0 [ 1001.695966] ret_from_fork+0x24/0x30 [ 1001.699755] Sending NMI from CPU 1 to CPUs 0: [ 1001.704788] NMI backtrace for cpu 0 [ 1001.704792] CPU: 0 PID: 4608 Comm: systemd-journal Not tainted 4.14.291-syzkaller #0 [ 1001.704797] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 1001.704800] task: ffff8880a22c4440 task.stack: ffff8880a22c8000 [ 1001.704802] RIP: 0010:__lock_acquire+0x452/0x3f20 [ 1001.704805] RSP: 0018:ffff8880a22cf8f0 EFLAGS: 00000097 [ 1001.704810] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 1001.704814] RDX: 0000000000000007 RSI: 1ffff1101445899d RDI: ffff8880a22c4cb4 [ 1001.704817] RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000001 [ 1001.704821] R10: ffff8880a22c4cf0 R11: ffff8880a22c4440 R12: ffff8880a22c4d08 [ 1001.704825] R13: 00000000000000bb R14: 00000000000000bb R15: ffffffff8becddc0 [ 1001.704829] FS: 00007f48b21d08c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 1001.704831] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1001.704835] CR2: 00007f48af5a3000 CR3: 00000000a231a000 CR4: 00000000003406f0 [ 1001.704839] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1001.704842] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1001.704844] Call Trace: [ 1001.704846] ? __lock_acquire+0x5fc/0x3f20 [ 1001.704849] ? trace_hardirqs_on+0x10/0x10 [ 1001.704851] ? unwind_next_frame+0xe54/0x17d0 [ 1001.704853] ? __save_stack_trace+0x63/0x160 [ 1001.704856] ? deref_stack_reg+0x124/0x1a0 [ 1001.704858] ? trace_hardirqs_on+0x10/0x10 [ 1001.704860] ? lock_acquire+0x170/0x3f0 [ 1001.704863] ? lock_downgrade+0x740/0x740 [ 1001.704865] lock_acquire+0x170/0x3f0 [ 1001.704867] ? path_init+0xee3/0x1a20 [ 1001.704869] set_root+0x125/0x550 [ 1001.704871] ? path_init+0xee3/0x1a20 [ 1001.704874] ? check_preemption_disabled+0x35/0x240 [ 1001.704876] path_init+0xee3/0x1a20 [ 1001.704878] ? kasan_kmalloc+0x139/0x160 [ 1001.704881] path_parentat+0x22/0x120 [ 1001.704883] filename_parentat+0x176/0x520 [ 1001.704885] ? __put_seccomp_filter+0x90/0x90 [ 1001.704887] ? getname+0x20/0x20 [ 1001.704890] ? cache_alloc_refill+0x2fa/0x350 [ 1001.704892] ? lock_downgrade+0x740/0x740 [ 1001.704895] ? do_raw_spin_unlock+0x164/0x220 [ 1001.704897] ? check_stack_object+0x86/0xa0 [ 1001.704899] filename_create+0x8a/0x3f0 [ 1001.704902] ? kern_path_mountpoint+0x40/0x40 [ 1001.704904] ? getname_flags+0x22e/0x550 [ 1001.704906] SyS_mkdirat+0x95/0x270 [ 1001.704908] ? SyS_mknod+0x30/0x30 [ 1001.704911] ? do_syscall_64+0x4c/0x640 [ 1001.704913] ? SyS_mkdirat+0x270/0x270 [ 1001.704915] do_syscall_64+0x1d5/0x640 [ 1001.704918] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1001.704920] RIP: 0033:0x7f48b148b687 [ 1001.704922] RSP: 002b:00007fffddf31418 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 [ 1001.704928] RAX: ffffffffffffffda RBX: 00007fffddf34480 RCX: 00007f48b148b687 [ 1001.704932] RDX: 0000000000000000 RSI: 00000000000001ed RDI: 00005606d2fec8a0 [ 1001.704936] RBP: 00007fffddf31450 R08: 00005606d21673e5 R09: 0000000000000018 [ 1001.704939] R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 [ 1001.704943] R13: 0000000000000001 R14: 00005606d2fec8a0 R15: 00007fffddf31a90 [ 1001.704944] Code: 48 ba 00 00 00 00 00 fc ff df 0f b6 0c 11 48 89 fa 83 e2 07 83 c2 03 38 ca 7c 08 84 c9 0f 85 dd 25 00 00 41 83 bb 74 08 00 00 01 <49> 8d 7a 24 48 89 fa 83 d8 ff c1 e3 0f c1 e0 0d c1 e5 10 0f b7 [ 1001.705314] Kernel panic - not syncing: hung_task: blocked tasks [ 1002.019971] CPU: 1 PID: 1532 Comm: khungtaskd Not tainted 4.14.291-syzkaller #0 [ 1002.027396] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 1002.036724] Call Trace: [ 1002.039300] dump_stack+0x1b2/0x281 [ 1002.042913] panic+0x1f9/0x42d [ 1002.046081] ? add_taint.cold+0x16/0x16 [ 1002.050032] watchdog+0x5ca/0xb40 [ 1002.053460] ? hungtask_pm_notify+0x50/0x50 [ 1002.057782] kthread+0x30d/0x420 [ 1002.061127] ? kthread_create_on_node+0xd0/0xd0 [ 1002.065777] ret_from_fork+0x24/0x30 [ 1002.069728] Kernel Offset: disabled [ 1002.073342] Rebooting in 86400 seconds..