[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 26.804767] kauditd_printk_skb: 7 callbacks suppressed [ 26.804781] audit: type=1800 audit(1540261281.975:29): pid=5216 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 26.831720] audit: type=1800 audit(1540261281.975:30): pid=5216 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.33' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 34.612700] kasan: CONFIG_KASAN_INLINE enabled [ 34.617569] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 34.625632] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 34.632002] CPU: 0 PID: 5369 Comm: syz-executor379 Not tainted 4.19.0-rc8+ #272 [ 34.639476] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.649152] RIP: 0010:rb_erase+0x306/0x3710 [ 34.653566] Code: c7 81 28 01 00 00 f2 f2 f2 f2 c7 81 2c 01 00 00 00 f2 f2 f2 48 89 f9 65 48 8b 1c 25 28 00 00 00 48 89 5d d0 31 db 48 c1 e9 03 <42> 80 3c 01 00 0f 85 41 1c 00 00 4c 8d 48 10 4c 8b 78 08 48 b9 00 [ 34.672576] RSP: 0018:ffff8801d939e918 EFLAGS: 00010202 [ 34.677997] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 34.685276] RDX: 1ffff1003b273d2b RSI: ffffffff8afc5060 RDI: 0000000000000008 [ 34.692626] RBP: ffff8801d939f320 R08: dffffc0000000000 R09: fffffbfff12d6968 [ 34.699901] R10: fffffbfff12d6968 R11: ffffffff896b4b43 R12: ffff8801b7312970 [ 34.707170] R13: dffffc0000000000 R14: ffff8801d939f2f8 R15: ffff8801d939f438 [ 34.714464] FS: 00000000018da880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 34.722690] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.728570] CR2: 0000000020000080 CR3: 00000001d8cf3000 CR4: 00000000001406f0 [ 34.735840] Call Trace: [ 34.738456] ? lockdep_on+0x50/0x50 [ 34.742089] ? rb_insert_color+0x1460/0x1460 [ 34.746500] ? noop_count+0x40/0x40 [ 34.750127] ? lock_pin_lock+0x350/0x350 [ 34.754191] ? rcu_bh_qs+0xc0/0xc0 [ 34.757733] ? unwind_dump+0x190/0x190 [ 34.761625] ? kasan_check_read+0x11/0x20 [ 34.765823] ? __lock_acquire+0x2881/0x4ec0 [ 34.770144] ? noop_count+0x40/0x40 [ 34.773850] ? lock_pin_lock+0x350/0x350 [ 34.777939] ? mark_held_locks+0x130/0x130 [ 34.782179] ? check_usage_forwards+0x3e0/0x3e0 [ 34.786850] ? __bfs+0x385/0x7a0 [ 34.790284] ? check_usage+0x1a9/0x790 [ 34.794171] ? lock_pin_lock+0x350/0x350 [ 34.798241] ? check_usage_forwards+0x3e0/0x3e0 [ 34.802918] ? __bfs+0x385/0x7a0 [ 34.806399] ? lockdep_on+0x50/0x50 [ 34.810055] ? lock_pin_lock+0x350/0x350 [ 34.814121] ? mark_held_locks+0x130/0x130 [ 34.818453] ? kasan_check_read+0x11/0x20 [ 34.822612] ? __lock_acquire+0x2881/0x4ec0 [ 34.827005] ? mark_held_locks+0x130/0x130 [ 34.831263] ? print_usage_bug+0xc0/0xc0 [ 34.835395] ? _raw_spin_unlock+0x2c/0x50 [ 34.839602] ? graph_lock+0x170/0x170 [ 34.843445] ? ext4_exit_mballoc+0xc0/0xc0 [ 34.847687] ? __lock_acquire+0x7ec/0x4ec0 [ 34.851927] ? find_held_lock+0x36/0x1c0 [ 34.855990] ? mark_held_locks+0x130/0x130 [ 34.860225] ? lock_downgrade+0x900/0x900 [ 34.864380] ? ext4_es_scan+0x960/0x960 [ 34.868354] ? do_raw_write_trylock+0x1c0/0x1c0 [ 34.873028] ? kasan_check_write+0x14/0x20 [ 34.877265] ? lock_acquire+0x1ed/0x520 [ 34.881239] ? integrity_inode_free+0x77/0x320 [ 34.885985] ? ext4_es_remove_extent+0x151/0x500 [ 34.890745] ? lock_release+0x970/0x970 [ 34.894722] ? kasan_check_write+0x14/0x20 [ 34.898958] ? do_raw_write_lock+0xbd/0x1e0 [ 34.903281] integrity_inode_free+0x12f/0x320 [ 34.907837] security_inode_free+0x19/0x90 [ 34.912075] __destroy_inode+0x328/0x820 [ 34.916135] ? generic_update_time+0x450/0x450 [ 34.920716] ? evict+0x5d8/0x980 [ 34.924193] ? lock_downgrade+0x900/0x900 [ 34.928389] ? __inode_wait_for_writeback+0x2cf/0x380 [ 34.933581] destroy_inode+0xda/0x200 [ 34.937378] ? __destroy_inode+0x820/0x820 [ 34.941616] ? kasan_check_write+0x14/0x20 [ 34.945854] ? do_raw_spin_lock+0xc1/0x230 [ 34.950092] evict+0x5e0/0x980 [ 34.953288] ? destroy_inode+0x200/0x200 [ 34.957349] ? iput+0x671/0xa90 [ 34.960633] ? lock_downgrade+0x900/0x900 [ 34.964985] ? kasan_check_read+0x11/0x20 [ 34.969133] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 34.973718] ? lock_downgrade+0x900/0x900 [ 34.977866] iput+0x679/0xa90 [ 34.981112] ? inode_add_lru+0x2a0/0x2a0 [ 34.985293] ? up_write+0x7b/0x220 [ 34.988829] ? up_read+0x110/0x110 [ 34.992366] ? up_read+0x110/0x110 [ 34.995907] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.001477] ? check_preemption_disabled+0x48/0x280 [ 35.006500] ext4_ioctl+0x236f/0x4210 [ 35.010304] ? is_bpf_text_address+0xac/0x170 [ 35.014800] ? ext4_ioctl_group_add+0x560/0x560 [ 35.019490] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 35.025301] ? kasan_check_read+0x11/0x20 [ 35.029646] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 35.034929] ? rcu_bh_qs+0xc0/0xc0 [ 35.038476] ? rcu_bh_qs+0xc0/0xc0 [ 35.042018] ? unwind_dump+0x190/0x190 [ 35.045909] ? is_bpf_text_address+0xd3/0x170 [ 35.050408] ? kernel_text_address+0x79/0xf0 [ 35.054850] ? __kernel_text_address+0xd/0x40 [ 35.059346] ? unwind_get_return_address+0x61/0xa0 [ 35.064275] ? __save_stack_trace+0x8d/0xf0 [ 35.068599] ? save_stack+0xa9/0xd0 [ 35.072224] ? save_stack+0x43/0xd0 [ 35.075847] ? __kasan_slab_free+0x102/0x150 [ 35.080350] ? kasan_slab_free+0xe/0x10 [ 35.084324] ? kmem_cache_free+0x83/0x290 [ 35.088477] ? putname+0xf2/0x130 [ 35.091933] ? do_sys_open+0x54d/0x700 [ 35.095819] ? __x64_sys_openat+0x9d/0x100 [ 35.100054] ? do_syscall_64+0x1b9/0x820 [ 35.104178] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.109557] ? trace_hardirqs_off+0xb8/0x310 [ 35.113978] ? kasan_check_read+0x11/0x20 [ 35.118129] ? do_raw_spin_unlock+0xa7/0x330 [ 35.122541] ? trace_hardirqs_on+0x310/0x310 [ 35.126959] ? kasan_check_write+0x14/0x20 [ 35.131196] ? trace_hardirqs_off+0xb8/0x310 [ 35.135618] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.141383] ? check_preemption_disabled+0x48/0x280 [ 35.146406] ? check_preemption_disabled+0x48/0x280 [ 35.151480] ? ext4_ioctl_group_add+0x560/0x560 [ 35.156152] do_vfs_ioctl+0x1de/0x1720 [ 35.160045] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 35.165461] ? ioctl_preallocate+0x300/0x300 [ 35.170072] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.175662] ? __fget_light+0x2e9/0x430 [ 35.179639] ? fget_raw+0x20/0x20 [ 35.183090] ? putname+0xf2/0x130 [ 35.186545] ? rcu_read_lock_sched_held+0x108/0x120 [ 35.191684] ? kmem_cache_free+0x24f/0x290 [ 35.195979] ? putname+0xf7/0x130 [ 35.199469] ? do_syscall_64+0x9a/0x820 [ 35.203476] ? do_syscall_64+0x9a/0x820 [ 35.207474] ? lockdep_hardirqs_on+0x421/0x5c0 [ 35.212103] ? security_file_ioctl+0x94/0xc0 [ 35.216514] ksys_ioctl+0xa9/0xd0 [ 35.219971] __x64_sys_ioctl+0x73/0xb0 [ 35.223921] do_syscall_64+0x1b9/0x820 [ 35.227869] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 35.233234] ? syscall_return_slowpath+0x5e0/0x5e0 [ 35.238163] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.243011] ? trace_hardirqs_on_caller+0x310/0x310 [ 35.248029] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 35.253134] ? prepare_exit_to_usermode+0x291/0x3b0 [ 35.258151] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.262997] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.268297] RIP: 0033:0x440009 [ 35.271551] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 35.290475] RSP: 002b:00007ffc20c0b518 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 35.298190] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 35.305528] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 35.312803] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 35.320079] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 35.327351] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 35.334627] Modules linked in: [ 35.338135] ---[ end trace 3b76568133d36ddc ]--- [ 35.342942] RIP: 0010:rb_erase+0x306/0x3710 [ 35.347508] Code: c7 81 28 01 00 00 f2 f2 f2 f2 c7 81 2c 01 00 00 00 f2 f2 f2 48 89 f9 65 48 8b 1c 25 28 00 00 00 48 89 5d d0 31 db 48 c1 e9 03 <42> 80 3c 01 00 0f 85 41 1c 00 00 4c 8d 48 10 4c 8b 78 08 48 b9 00 [ 35.366596] RSP: 0018:ffff8801d939e918 EFLAGS: 00010202 [ 35.372156] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 35.379590] RDX: 1ffff1003b273d2b RSI: ffffffff8afc5060 RDI: 0000000000000008 [ 35.386997] RBP: ffff8801d939f320 R08: dffffc0000000000 R09: fffffbfff12d6968 [ 35.394306] R10: fffffbfff12d6968 R11: ffffffff896b4b43 R12: ffff8801b7312970 [ 35.401619] R13: dffffc0000000000 R14: ffff8801d939f2f8 R15: ffff8801d939f438 [ 35.408892] FS: 00000000018da880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 35.417382] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.423379] CR2: 0000000020000080 CR3: 00000001d8cf3000 CR4: 00000000001406f0 [ 35.430747] Kernel panic - not syncing: Fatal exception [ 35.437309] Kernel Offset: disabled [ 35.440953] Rebooting in 86400 seconds..