[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 85.408002][ T27] audit: type=1800 audit(1578758204.435:25): pid=9445 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 85.427838][ T27] audit: type=1800 audit(1578758204.435:26): pid=9445 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 85.456511][ T27] audit: type=1800 audit(1578758204.435:27): pid=9445 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.234' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 592.189850][ T1128] INFO: task syz-executor520:9599 blocked for more than 143 seconds. [ 592.189874][ T1128] Not tainted 5.5.0-rc5-syzkaller #0 [ 592.189880][ T1128] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 592.189888][ T1128] syz-executor520 D28536 9599 9595 0x00004004 [ 592.189912][ T1128] Call Trace: [ 592.190004][ T1128] __schedule+0x934/0x1f90 [ 592.190029][ T1128] ? __sched_text_start+0x8/0x8 [ 592.190095][ T1128] ? lock_downgrade+0x920/0x920 [ 592.190132][ T1128] ? rwlock_bug.part.0+0x90/0x90 [ 592.190155][ T1128] schedule+0xdc/0x2b0 [ 592.190176][ T1128] schedule_preempt_disabled+0x13/0x20 [ 592.190192][ T1128] __mutex_lock+0x7ab/0x13c0 [ 592.190251][ T1128] ? fb_open+0xd7/0x450 [ 592.190273][ T1128] ? mutex_trylock+0x2d0/0x2d0 [ 592.190292][ T1128] ? __mutex_unlock_slowpath+0xf0/0x6a0 [ 592.190327][ T1128] ? chrdev_open+0xca/0x6b0 [ 592.190361][ T1128] mutex_lock_nested+0x16/0x20 [ 592.190376][ T1128] ? mutex_lock_nested+0x16/0x20 [ 592.190391][ T1128] fb_open+0xd7/0x450 [ 592.190411][ T1128] ? get_fb_info.part.0+0x80/0x80 [ 592.190425][ T1128] chrdev_open+0x245/0x6b0 [ 592.190443][ T1128] ? cdev_put.part.0+0x50/0x50 [ 592.190486][ T1128] ? security_file_open+0x87/0x300 [ 592.190545][ T1128] do_dentry_open+0x4e6/0x1380 [ 592.190596][ T1128] ? __kasan_check_read+0x11/0x20 [ 592.190612][ T1128] ? cdev_put.part.0+0x50/0x50 [ 592.190634][ T1128] ? chown_common+0x5c0/0x5c0 [ 592.190653][ T1128] ? inode_permission+0xb4/0x520 [ 592.190673][ T1128] vfs_open+0xa0/0xd0 [ 592.190692][ T1128] path_openat+0x10df/0x4500 [ 592.190705][ T1128] ? save_stack+0x23/0x90 [ 592.190720][ T1128] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 592.190734][ T1128] ? kasan_slab_alloc+0xf/0x20 [ 592.190748][ T1128] ? kmem_cache_alloc+0x121/0x710 [ 592.190764][ T1128] ? getname_flags+0xd6/0x5b0 [ 592.190779][ T1128] ? getname+0x1a/0x20 [ 592.190810][ T1128] ? path_lookupat.isra.0+0x8d0/0x8d0 [ 592.190824][ T1128] ? __lock_acquire+0x16f2/0x4a00 [ 592.190866][ T1128] ? __alloc_fd+0x487/0x620 [ 592.190889][ T1128] do_filp_open+0x1a1/0x280 [ 592.190908][ T1128] ? may_open_dev+0x100/0x100 [ 592.190943][ T1128] ? do_raw_spin_unlock+0x181/0x270 [ 592.190978][ T1128] do_sys_open+0x3fe/0x5d0 [ 592.190997][ T1128] ? filp_open+0x80/0x80 [ 592.191043][ T1128] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 592.191065][ T1128] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 592.191082][ T1128] ? do_syscall_64+0x26/0x790 [ 592.191118][ T1128] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 592.191134][ T1128] ? do_syscall_64+0x26/0x790 [ 592.191154][ T1128] __x64_sys_openat+0x9d/0x100 [ 592.191174][ T1128] do_syscall_64+0xfa/0x790 [ 592.191194][ T1128] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 592.191206][ T1128] RIP: 0033:0x445979 [ 592.191248][ T1128] Code: Bad RIP value. [ 592.191257][ T1128] RSP: 002b:00007f5d21dfedb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 592.191273][ T1128] RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 0000000000445979 [ 592.191282][ T1128] RDX: 0000000000000000 RSI: 00000000200001c0 RDI: ffffffffffffff9c [ 592.191292][ T1128] RBP: 00000000006dac30 R08: 00007f5d21dff700 R09: 0000000000000000 [ 592.191302][ T1128] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c [ 592.191312][ T1128] R13: 00007ffe53b4d15f R14: 00007f5d21dff9c0 R15: 20c49ba5e353f7cf [ 592.191340][ T1128] INFO: task syz-executor520:9600 blocked for more than 143 seconds. [ 592.191350][ T1128] Not tainted 5.5.0-rc5-syzkaller #0 [ 592.191356][ T1128] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 592.191363][ T1128] syz-executor520 D29512 9600 9595 0x00000004 [ 592.191385][ T1128] Call Trace: [ 592.191406][ T1128] __schedule+0x934/0x1f90 [ 592.191428][ T1128] ? __sched_text_start+0x8/0x8 [ 592.191489][ T1128] ? is_bpf_text_address+0xce/0x160 [ 592.191510][ T1128] schedule+0xdc/0x2b0 [ 592.191530][ T1128] schedule_timeout+0x717/0xc50 [ 592.191544][ T1128] ? find_held_lock+0x35/0x130 [ 592.191564][ T1128] ? usleep_range+0x170/0x170 [ 592.191578][ T1128] ? __lock_acquire+0x16f2/0x4a00 [ 592.191597][ T1128] ? lock_downgrade+0x920/0x920 [ 592.191612][ T1128] ? _raw_spin_unlock_irq+0x23/0x80 [ 592.191626][ T1128] ? __down+0x16e/0x2c0 [ 592.191640][ T1128] ? _raw_spin_unlock_irq+0x23/0x80 [ 592.191655][ T1128] ? lockdep_hardirqs_on+0x421/0x5e0 [ 592.191711][ T1128] ? trace_hardirqs_on+0x67/0x240 [ 592.191733][ T1128] __down+0x176/0x2c0 [ 592.191750][ T1128] ? do_raw_spin_lock+0x139/0x2f0 [ 592.191767][ T1128] ? __up.isra.0+0x1a0/0x1a0 [ 592.191816][ T1128] down+0x64/0x90 [ 592.191834][ T1128] console_lock+0x29/0x80 [ 592.191850][ T1128] do_fb_ioctl+0x335/0x7d0 [ 592.191866][ T1128] ? rwlock_bug.part.0+0x90/0x90 [ 592.191883][ T1128] ? fb_mmap+0x520/0x520 [ 592.191935][ T1128] ? tomoyo_path_number_perm+0x214/0x520 [ 592.191950][ T1128] ? find_held_lock+0x35/0x130 [ 592.191969][ T1128] ? tomoyo_path_number_perm+0x214/0x520 [ 592.191991][ T1128] ? lock_downgrade+0x920/0x920 [ 592.192006][ T1128] ? lockdep_hardirqs_on+0x421/0x5e0 [ 592.192029][ T1128] ? tomoyo_path_number_perm+0x454/0x520 [ 592.192083][ T1128] fb_ioctl+0xe6/0x130 [ 592.192098][ T1128] ? do_fb_ioctl+0x7d0/0x7d0 [ 592.192115][ T1128] do_vfs_ioctl+0x977/0x14e0 [ 592.192137][ T1128] ? compat_ioctl_preallocate+0x220/0x220 [ 592.192152][ T1128] ? __fget+0x37f/0x550 [ 592.192174][ T1128] ? ksys_dup3+0x3e0/0x3e0 [ 592.192230][ T1128] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 592.192253][ T1128] ? tomoyo_file_ioctl+0x23/0x30 [ 592.192304][ T1128] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 592.192320][ T1128] ? security_file_ioctl+0x8d/0xc0 [ 592.192339][ T1128] ksys_ioctl+0xab/0xd0 [ 592.192359][ T1128] __x64_sys_ioctl+0x73/0xb0 [ 592.192378][ T1128] do_syscall_64+0xfa/0x790 [ 592.192398][ T1128] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 592.192409][ T1128] RIP: 0033:0x445979 [ 592.192424][ T1128] Code: Bad RIP value. [ 592.192433][ T1128] RSP: 002b:00007f5d21ddddb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 592.192448][ T1128] RAX: ffffffffffffffda RBX: 00000000006dac48 RCX: 0000000000445979 [ 592.192457][ T1128] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 592.192467][ T1128] RBP: 00000000006dac40 R08: 00007f5d21dde700 R09: 0000000000000000 [ 592.192476][ T1128] R10: 00007f5d21dde700 R11: 0000000000000246 R12: 00000000006dac4c [ 592.192486][ T1128] R13: 00007ffe53b4d15f R14: 00007f5d21dde9c0 R15: 20c49ba5e353f7cf [ 592.192510][ T1128] [ 592.192510][ T1128] Showing all locks held in the system: [ 592.192525][ T1128] 1 lock held by khungtaskd/1128: [ 592.192530][ T1128] #0: ffffffff899a5340 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 [ 592.192588][ T1128] 1 lock held by rsyslogd/9483: [ 592.192594][ T1128] #0: ffff88808c5f8660 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 592.192626][ T1128] 2 locks held by getty/9573: [ 592.192631][ T1128] #0: ffff888093953090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 592.192661][ T1128] #1: ffffc900016eb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 592.192735][ T1128] 2 locks held by getty/9574: [ 592.192740][ T1128] #0: ffff8880a1600090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 592.192770][ T1128] #1: ffffc9000177b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 592.192805][ T1128] 2 locks held by getty/9575: [ 592.192810][ T1128] #0: ffff88808bd66090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 592.192839][ T1128] #1: ffffc9000171b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 592.192873][ T1128] 2 locks held by getty/9576: [ 592.192879][ T1128] #0: ffff8880a0257090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 592.192908][ T1128] #1: ffffc9000178b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 592.192942][ T1128] 2 locks held by getty/9577: [ 592.192947][ T1128] #0: ffff88809481e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 592.192975][ T1128] #1: ffffc9000175b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 592.193010][ T1128] 2 locks held by getty/9578: [ 592.193015][ T1128] #0: ffff888095682090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 592.193043][ T1128] #1: ffffc9000176b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 592.193083][ T1128] 2 locks held by getty/9579: [ 592.193088][ T1128] #0: ffff888096b3e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 592.193117][ T1128] #1: ffffc900016c32e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 592.193153][ T1128] 2 locks held by syz-executor520/9598: [ 592.193162][ T1128] 1 lock held by syz-executor520/9599: [ 592.193167][ T1128] #0: ffff8882193e4070 (&fb_info->lock){+.+.}, at: fb_open+0xd7/0x450 [ 592.193196][ T1128] [ 592.193202][ T1128] ============================================= [ 592.193202][ T1128] [ 592.193209][ T1128] NMI backtrace for cpu 0 [ 592.193225][ T1128] CPU: 0 PID: 1128 Comm: khungtaskd Not tainted 5.5.0-rc5-syzkaller #0 [ 592.193234][ T1128] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 592.193238][ T1128] Call Trace: [ 592.193273][ T1128] dump_stack+0x197/0x210 [ 592.193295][ T1128] nmi_cpu_backtrace.cold+0x70/0xb2 [ 592.193310][ T1128] ? vprintk_func+0x86/0x189 [ 592.193367][ T1128] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 592.193386][ T1128] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 592.193407][ T1128] arch_trigger_cpumask_backtrace+0x14/0x20 [ 592.193422][ T1128] watchdog+0xb11/0x10c0 [ 592.193464][ T1128] kthread+0x361/0x430 [ 592.193481][ T1128] ? reset_hung_task_detector+0x30/0x30 [ 592.193494][ T1128] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 592.193511][ T1128] ret_from_fork+0x24/0x30 [ 592.193536][ T1128] Sending NMI from CPU 0 to CPUs 1: [ 592.194184][ C1] NMI backtrace for cpu 1 [ 592.194190][ C1] CPU: 1 PID: 9598 Comm: syz-executor520 Not tainted 5.5.0-rc5-syzkaller #0 [ 592.194197][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 592.194201][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 [ 592.194212][ C1] Code: ff cc cc cc cc cc cc cc cc cc 65 48 8b 04 25 c0 1e 02 00 48 8b 80 98 13 00 00 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 <55> 48 89 e5 65 48 8b 04 25 c0 1e 02 00 65 8b 15 84 f7 8c 7e 81 e2 [ 592.194215][ C1] RSP: 0018:ffffc90001e473a0 EFLAGS: 00000216 [ 592.194223][ C1] RAX: 0000000000000000 RBX: 0000000000000050 RCX: ffffffff83c58fa0 [ 592.194228][ C1] RDX: 0000000000000044 RSI: 0000000000000050 RDI: 0000000000000004 [ 592.194233][ C1] RBP: ffffc90001e47408 R08: ffff888095444200 R09: ffffed1014797e2c [ 592.194238][ C1] R10: ffffed1014797e2b R11: ffff8880a3cbf15f R12: 0000000000000044 [ 592.194243][ C1] R13: ffff8880000a0044 R14: ffff8880000a0000 R15: 0000000000000000 [ 592.194248][ C1] FS: 00007f5d21e20700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 592.194253][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 592.194258][ C1] CR2: 00000000200001c0 CR3: 000000009f849000 CR4: 00000000001406e0 [ 592.194263][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 592.194268][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 592.194270][ C1] Call Trace: [ 592.194273][ C1] ? vga16fb_fillrect+0xa0a/0x19b0 [ 592.194277][ C1] bit_clear_margins+0x30b/0x530 [ 592.194280][ C1] ? bit_bmove+0x270/0x270 [ 592.194284][ C1] ? efifb_probe.cold+0x181f/0x181f [ 592.194287][ C1] fbcon_clear_margins+0x1e9/0x250 [ 592.194290][ C1] fbcon_switch+0xd7f/0x17f0 [ 592.194294][ C1] ? fbcon_set_def_font+0x360/0x360 [ 592.194297][ C1] ? fbcon_cursor+0x48c/0x660 [ 592.194301][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 592.194304][ C1] ? fbcon_set_origin+0x2b/0x50 [ 592.194308][ C1] ? fbcon_scrolldelta+0x1220/0x1220 [ 592.194312][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 592.194315][ C1] redraw_screen+0x2b6/0x7d0 [ 592.194319][ C1] ? efifb_probe.cold+0x181f/0x181f [ 592.194322][ C1] ? respond_string+0x2c0/0x2c0 [ 592.194325][ C1] ? fbcon_set_palette+0x3c4/0x4a0 [ 592.194329][ C1] fbcon_modechanged+0x5c3/0x790 [ 592.194332][ C1] fbcon_update_vcs+0x42/0x50 [ 592.194335][ C1] fb_set_var+0xb32/0xdd0 [ 592.194338][ C1] ? fb_blank+0x1a0/0x1a0 [ 592.194341][ C1] ? lock_acquire+0x190/0x410 [ 592.194345][ C1] ? __mutex_lock+0x458/0x13c0 [ 592.194348][ C1] ? down+0x50/0x90 [ 592.194351][ C1] ? do_fb_ioctl+0x335/0x7d0 [ 592.194354][ C1] do_fb_ioctl+0x390/0x7d0 [ 592.194357][ C1] ? fb_mmap+0x520/0x520 [ 592.194361][ C1] ? tomoyo_path_number_perm+0x214/0x520 [ 592.194364][ C1] ? find_held_lock+0x35/0x130 [ 592.194368][ C1] ? tomoyo_path_number_perm+0x214/0x520 [ 592.194371][ C1] ? lock_downgrade+0x920/0x920 [ 592.194375][ C1] ? lockdep_hardirqs_on+0x421/0x5e0 [ 592.194379][ C1] ? tomoyo_path_number_perm+0x454/0x520 [ 592.194382][ C1] fb_ioctl+0xe6/0x130 [ 592.194385][ C1] ? do_fb_ioctl+0x7d0/0x7d0 [ 592.194388][ C1] do_vfs_ioctl+0x977/0x14e0 [ 592.194392][ C1] ? compat_ioctl_preallocate+0x220/0x220 [ 592.194395][ C1] ? __fget+0x37f/0x550 [ 592.194398][ C1] ? ksys_dup3+0x3e0/0x3e0 [ 592.194401][ C1] ? tomoyo_file_ioctl+0x23/0x30 [ 592.194405][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 592.194409][ C1] ? security_file_ioctl+0x8d/0xc0 [ 592.194412][ C1] ksys_ioctl+0xab/0xd0 [ 592.194415][ C1] __x64_sys_ioctl+0x73/0xb0 [ 592.194418][ C1] do_syscall_64+0xfa/0x790 [ 592.194422][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 592.194425][ C1] RIP: 0033:0x445979 [ 592.194436][ C1] Code: e8 bc b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 592.194440][ C1] RSP: 002b:00007f5d21e1fdb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 592.194449][ C1] RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 0000000000445979 [ 592.194454][ C1] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 592.194459][ C1] RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 [ 592.194464][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac2c [ 592.194469][ C1] R13: 00007ffe53b4d15f R14: 00007f5d21e209c0 R15: 20c49ba5e353f7cf [ 592.207763][ T1128] Kernel panic - not syncing: hung_task: blocked tasks [ 592.207783][ T1128] CPU: 0 PID: 1128 Comm: khungtaskd Not tainted 5.5.0-rc5-syzkaller #0 [ 592.207792][ T1128] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 592.207798][ T1128] Call Trace: [ 592.207819][ T1128] dump_stack+0x197/0x210 [ 592.207930][ T1128] panic+0x2e3/0x75c [ 592.207946][ T1128] ? add_taint.cold+0x16/0x16 [ 592.207964][ T1128] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 592.207983][ T1128] ? ___preempt_schedule+0x16/0x18 [ 592.208005][ T1128] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 592.208022][ T1128] ? nmi_trigger_cpumask_backtrace+0x24c/0x28b [ 592.208038][ T1128] ? nmi_trigger_cpumask_backtrace+0x256/0x28b [ 592.208060][ T1128] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 592.208081][ T1128] watchdog+0xb22/0x10c0 [ 592.208104][ T1128] kthread+0x361/0x430 [ 592.208121][ T1128] ? reset_hung_task_detector+0x30/0x30 [ 592.208135][ T1128] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 592.208151][ T1128] ret_from_fork+0x24/0x30 [ 592.209237][ T1128] Kernel Offset: disabled