[....] 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. [ 26.952792] kauditd_printk_skb: 7 callbacks suppressed [ 26.952805] audit: type=1800 audit(1540246112.089:29): pid=5236 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 [ 26.986347] audit: type=1800 audit(1540246112.099:30): pid=5236 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 '10.128.0.86' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 34.105900] kasan: CONFIG_KASAN_INLINE enabled [ 34.110788] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 34.118279] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 34.124535] CPU: 0 PID: 5390 Comm: syz-executor918 Not tainted 4.19.0+ #297 [ 34.131699] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.141181] RIP: 0010:rb_erase+0x306/0x3710 [ 34.145500] 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 [ 34.164396] RSP: 0018:ffff8801baebe918 EFLAGS: 00010202 [ 34.169756] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 34.177022] RDX: 1ffff100375d7d2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 34.184290] RBP: ffff8801baebf320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 34.191669] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801b6e31830 [ 34.198936] R13: dffffc0000000000 R14: ffff8801baebf2f8 R15: ffff8801baebf438 [ 34.206260] FS: 00000000017ba880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 34.214678] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.220553] CR2: 0000000020000080 CR3: 00000001baf0d000 CR4: 00000000001406f0 [ 34.227841] Call Trace: [ 34.230433] ? lockdep_on+0x50/0x50 [ 34.234168] ? rb_insert_color+0x1460/0x1460 [ 34.238734] ? lock_downgrade+0x900/0x900 [ 34.242936] ? noop_count+0x40/0x40 [ 34.246565] ? lock_pin_lock+0x350/0x350 [ 34.250629] ? rcu_bh_qs+0xc0/0xc0 [ 34.254168] ? unwind_dump+0x190/0x190 [ 34.258055] ? kasan_check_read+0x11/0x20 [ 34.262250] ? noop_count+0x40/0x40 [ 34.265879] ? lock_pin_lock+0x350/0x350 [ 34.269988] ? mark_held_locks+0x130/0x130 [ 34.274243] ? check_usage_forwards+0x3e0/0x3e0 [ 34.278981] ? __bfs+0x385/0x7a0 [ 34.282354] ? check_usage+0x1a9/0x790 [ 34.286323] ? lock_pin_lock+0x350/0x350 [ 34.290382] ? check_usage_forwards+0x3e0/0x3e0 [ 34.295046] ? __bfs+0x385/0x7a0 [ 34.298409] ? modules_open+0xa0/0xa0 [ 34.302204] ? lockdep_on+0x50/0x50 [ 34.305848] ? lock_pin_lock+0x350/0x350 [ 34.309912] ? mark_held_locks+0x130/0x130 [ 34.314145] ? kasan_check_read+0x11/0x20 [ 34.318287] ? __lock_acquire+0x2881/0x4ec0 [ 34.322608] ? mark_held_locks+0x130/0x130 [ 34.326862] ? print_usage_bug+0xc0/0xc0 [ 34.330923] ? _raw_spin_unlock+0x2c/0x50 [ 34.335071] ? graph_lock+0x170/0x170 [ 34.338876] ? ext4_exit_mballoc+0xc0/0xc0 [ 34.343114] ? __lock_acquire+0x7ec/0x4ec0 [ 34.347357] ? find_held_lock+0x36/0x1c0 [ 34.351415] ? mark_held_locks+0x130/0x130 [ 34.355646] ? lock_downgrade+0x900/0x900 [ 34.359795] ? ext4_es_scan+0x960/0x960 [ 34.363877] ? lock_release+0x970/0x970 [ 34.367872] ? do_raw_write_trylock+0x1c0/0x1c0 [ 34.372588] ? kasan_check_write+0x14/0x20 [ 34.376891] ? lock_acquire+0x1ed/0x520 [ 34.380875] ? integrity_inode_free+0x77/0x320 [ 34.385464] ? ext4_es_remove_extent+0x151/0x500 [ 34.390271] ? lock_release+0x970/0x970 [ 34.394246] ? kasan_check_write+0x14/0x20 [ 34.398477] ? do_raw_write_lock+0xbd/0x1e0 [ 34.402798] integrity_inode_free+0x12f/0x320 [ 34.407362] security_inode_free+0x19/0x90 [ 34.411599] __destroy_inode+0x328/0x820 [ 34.415660] ? generic_update_time+0x450/0x450 [ 34.420239] ? evict+0x5d8/0x980 [ 34.423604] ? lock_downgrade+0x900/0x900 [ 34.427768] ? __inode_wait_for_writeback+0x2cf/0x380 [ 34.432960] destroy_inode+0xda/0x200 [ 34.436757] ? __destroy_inode+0x820/0x820 [ 34.440994] ? kasan_check_write+0x14/0x20 [ 34.445227] ? do_raw_spin_lock+0xc1/0x230 [ 34.449460] evict+0x5e0/0x980 [ 34.452651] ? destroy_inode+0x200/0x200 [ 34.456710] ? iput+0x671/0xa90 [ 34.459985] ? lock_downgrade+0x900/0x900 [ 34.464426] ? kasan_check_read+0x11/0x20 [ 34.468573] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 34.473151] ? lock_downgrade+0x900/0x900 [ 34.477352] iput+0x679/0xa90 [ 34.480456] ? inode_add_lru+0x2a0/0x2a0 [ 34.484513] ? up_write+0x7b/0x220 [ 34.488051] ? up_read+0x110/0x110 [ 34.491586] ? up_read+0x110/0x110 [ 34.495128] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.500663] ? check_preemption_disabled+0x48/0x280 [ 34.505682] ext4_ioctl+0x236f/0x4210 [ 34.509484] ? is_bpf_text_address+0xac/0x170 [ 34.513981] ? ext4_ioctl_group_add+0x560/0x560 [ 34.518651] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 34.524451] ? kasan_check_read+0x11/0x20 [ 34.528596] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 34.533890] ? rcu_bh_qs+0xc0/0xc0 [ 34.537481] ? rcu_bh_qs+0xc0/0xc0 [ 34.541021] ? unwind_dump+0x190/0x190 [ 34.544910] ? is_bpf_text_address+0xd3/0x170 [ 34.549402] ? kernel_text_address+0x79/0xf0 [ 34.553807] ? __kernel_text_address+0xd/0x40 [ 34.558322] ? unwind_get_return_address+0x61/0xa0 [ 34.563252] ? __save_stack_trace+0x8d/0xf0 [ 34.567573] ? save_stack+0xa9/0xd0 [ 34.571201] ? save_stack+0x43/0xd0 [ 34.574843] ? __kasan_slab_free+0x102/0x150 [ 34.579251] ? kasan_slab_free+0xe/0x10 [ 34.583220] ? kmem_cache_free+0x83/0x290 [ 34.587416] ? putname+0xf2/0x130 [ 34.590883] ? do_sys_open+0x54d/0x700 [ 34.594770] ? __x64_sys_openat+0x9d/0x100 [ 34.599003] ? do_syscall_64+0x1b9/0x820 [ 34.603061] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.608426] ? trace_hardirqs_off+0xb8/0x310 [ 34.612854] ? kasan_check_read+0x11/0x20 [ 34.617001] ? do_raw_spin_unlock+0xa7/0x330 [ 34.621402] ? trace_hardirqs_on+0x310/0x310 [ 34.625816] ? kasan_check_write+0x14/0x20 [ 34.630074] ? trace_hardirqs_off+0xb8/0x310 [ 34.634484] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.640146] ? check_preemption_disabled+0x48/0x280 [ 34.645161] ? check_preemption_disabled+0x48/0x280 [ 34.650175] ? ext4_ioctl_group_add+0x560/0x560 [ 34.654867] do_vfs_ioctl+0x1de/0x1720 [ 34.658755] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 34.664036] ? ioctl_preallocate+0x300/0x300 [ 34.668445] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.674034] ? __fget_light+0x2e9/0x430 [ 34.678007] ? fget_raw+0x20/0x20 [ 34.681508] ? putname+0xf2/0x130 [ 34.685015] ? rcu_read_lock_sched_held+0x108/0x120 [ 34.690083] ? kmem_cache_free+0x24f/0x290 [ 34.694465] ? putname+0xf7/0x130 [ 34.697919] ? do_syscall_64+0x9a/0x820 [ 34.701913] ? do_syscall_64+0x9a/0x820 [ 34.705892] ? lockdep_hardirqs_on+0x421/0x5c0 [ 34.710472] ? security_file_ioctl+0x94/0xc0 [ 34.714879] ksys_ioctl+0xa9/0xd0 [ 34.718332] __x64_sys_ioctl+0x73/0xb0 [ 34.722218] do_syscall_64+0x1b9/0x820 [ 34.726110] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 34.731485] ? syscall_return_slowpath+0x5e0/0x5e0 [ 34.736429] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.741273] ? trace_hardirqs_on_caller+0x310/0x310 [ 34.746340] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 34.751353] ? prepare_exit_to_usermode+0x291/0x3b0 [ 34.756367] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.761208] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.766394] RIP: 0033:0x440009 [ 34.769585] 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 [ 34.788485] RSP: 002b:00007ffcd51a7c68 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 34.796191] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 34.803461] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 34.810724] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 34.818118] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 34.825383] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 34.832652] Modules linked in: [ 34.836048] ---[ end trace 20eb75c7ff3a48d6 ]--- [ 34.840853] RIP: 0010:rb_erase+0x306/0x3710 [ 34.845215] 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 [ 34.864153] RSP: 0018:ffff8801baebe918 EFLAGS: 00010202 [ 34.869574] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 34.876892] RDX: 1ffff100375d7d2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 34.884249] RBP: ffff8801baebf320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 34.891517] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801b6e31830 [ 34.898817] R13: dffffc0000000000 R14: ffff8801baebf2f8 R15: ffff8801baebf438 [ 34.906147] FS: 00000000017ba880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 34.914406] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.920299] CR2: 0000000020000080 CR3: 00000001baf0d000 CR4: 00000000001406f0 [ 34.927598] Kernel panic - not syncing: Fatal exception [ 34.934175] Kernel Offset: disabled [ 34.937816] Rebooting in 86400 seconds..