[....] 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. [ 26.611483] kauditd_printk_skb: 7 callbacks suppressed [ 26.611495] audit: type=1800 audit(1540363964.480:29): pid=5211 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 [ 26.645076] audit: type=1800 audit(1540363964.480:30): pid=5211 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 '10.128.0.104' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.861707] kasan: CONFIG_KASAN_INLINE enabled [ 38.866527] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.874038] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.880286] CPU: 1 PID: 5366 Comm: syz-executor120 Not tainted 4.19.0-rc8+ #152 [ 38.887745] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.897180] RIP: 0010:rb_erase+0x306/0x3710 [ 38.901485] 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 [ 38.920405] RSP: 0018:ffff8801baf5e918 EFLAGS: 00010202 [ 38.925765] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 38.933022] RDX: 1ffff100375ebd2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 38.940277] RBP: ffff8801baf5f320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 38.947532] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801c3406530 [ 38.954794] R13: dffffc0000000000 R14: ffff8801baf5f2f8 R15: ffff8801baf5f438 [ 38.962066] FS: 0000000002305880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 38.970283] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.976145] CR2: 0000000020000080 CR3: 00000001baea8000 CR4: 00000000001406e0 [ 38.983400] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.990656] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.997906] Call Trace: [ 39.000478] ? lockdep_on+0x50/0x50 [ 39.004086] ? rb_insert_color+0x1460/0x1460 [ 39.008493] ? lock_downgrade+0x900/0x900 [ 39.012633] ? noop_count+0x40/0x40 [ 39.016246] ? lock_pin_lock+0x350/0x350 [ 39.020296] ? rcu_bh_qs+0xc0/0xc0 [ 39.023818] ? unwind_dump+0x190/0x190 [ 39.027692] ? kasan_check_read+0x11/0x20 [ 39.031841] ? noop_count+0x40/0x40 [ 39.035446] ? lock_pin_lock+0x350/0x350 [ 39.039505] ? mark_held_locks+0x130/0x130 [ 39.043805] ? check_usage_forwards+0x3e0/0x3e0 [ 39.048457] ? __bfs+0x385/0x7a0 [ 39.051806] ? check_usage+0x1a9/0x790 [ 39.055670] ? lock_pin_lock+0x350/0x350 [ 39.059724] ? check_usage_forwards+0x3e0/0x3e0 [ 39.064374] ? __bfs+0x385/0x7a0 [ 39.067726] ? modules_open+0xa0/0xa0 [ 39.071523] ? lockdep_on+0x50/0x50 [ 39.075129] ? lock_pin_lock+0x350/0x350 [ 39.079179] ? mark_held_locks+0x130/0x130 [ 39.083413] ? kasan_check_read+0x11/0x20 [ 39.087597] ? __lock_acquire+0x2881/0x4ec0 [ 39.091982] ? mark_held_locks+0x130/0x130 [ 39.096206] ? print_usage_bug+0xc0/0xc0 [ 39.100252] ? _raw_spin_unlock+0x2c/0x50 [ 39.104400] ? graph_lock+0x170/0x170 [ 39.108186] ? ext4_exit_mballoc+0xc0/0xc0 [ 39.112404] ? __lock_acquire+0x7ec/0x4ec0 [ 39.116636] ? find_held_lock+0x36/0x1c0 [ 39.120714] ? mark_held_locks+0x130/0x130 [ 39.124928] ? lock_downgrade+0x900/0x900 [ 39.129058] ? ext4_es_scan+0x960/0x960 [ 39.133092] ? lock_release+0x970/0x970 [ 39.137058] ? do_raw_write_trylock+0x1c0/0x1c0 [ 39.141732] ? kasan_check_write+0x14/0x20 [ 39.145949] ? lock_acquire+0x1ed/0x520 [ 39.149906] ? integrity_inode_free+0x77/0x320 [ 39.154469] ? ext4_es_remove_extent+0x151/0x500 [ 39.159207] ? lock_release+0x970/0x970 [ 39.163169] ? kasan_check_write+0x14/0x20 [ 39.167383] ? do_raw_write_lock+0xbd/0x1e0 [ 39.171687] integrity_inode_free+0x12f/0x320 [ 39.176179] security_inode_free+0x19/0x90 [ 39.180398] __destroy_inode+0x328/0x820 [ 39.184591] ? generic_update_time+0x450/0x450 [ 39.189161] ? evict+0x5d8/0x980 [ 39.192507] ? lock_downgrade+0x900/0x900 [ 39.196633] ? __inode_wait_for_writeback+0x2cf/0x380 [ 39.201811] destroy_inode+0xda/0x200 [ 39.205587] ? __destroy_inode+0x820/0x820 [ 39.209806] ? kasan_check_write+0x14/0x20 [ 39.214027] ? do_raw_spin_lock+0xc1/0x230 [ 39.218251] evict+0x5e0/0x980 [ 39.221427] ? destroy_inode+0x200/0x200 [ 39.225484] ? iput+0x671/0xa90 [ 39.228744] ? lock_downgrade+0x900/0x900 [ 39.232874] ? kasan_check_read+0x11/0x20 [ 39.237001] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 39.241562] ? lock_downgrade+0x900/0x900 [ 39.245704] iput+0x679/0xa90 [ 39.248792] ? inode_add_lru+0x2a0/0x2a0 [ 39.252835] ? up_write+0x7b/0x220 [ 39.256354] ? up_read+0x110/0x110 [ 39.259894] ? up_read+0x110/0x110 [ 39.263416] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.268939] ? check_preemption_disabled+0x48/0x280 [ 39.273957] ext4_ioctl+0x236f/0x4210 [ 39.277745] ? is_bpf_text_address+0xac/0x170 [ 39.282239] ? ext4_ioctl_group_add+0x560/0x560 [ 39.286906] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 39.292703] ? kasan_check_read+0x11/0x20 [ 39.296833] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 39.302098] ? rcu_bh_qs+0xc0/0xc0 [ 39.305618] ? rcu_bh_qs+0xc0/0xc0 [ 39.309141] ? unwind_dump+0x190/0x190 [ 39.313012] ? is_bpf_text_address+0xd3/0x170 [ 39.317488] ? kernel_text_address+0x79/0xf0 [ 39.321901] ? __kernel_text_address+0xd/0x40 [ 39.326395] ? unwind_get_return_address+0x61/0xa0 [ 39.331307] ? __save_stack_trace+0x8d/0xf0 [ 39.335611] ? save_stack+0xa9/0xd0 [ 39.339216] ? save_stack+0x43/0xd0 [ 39.342839] ? __kasan_slab_free+0x102/0x150 [ 39.347227] ? kasan_slab_free+0xe/0x10 [ 39.351182] ? kmem_cache_free+0x83/0x290 [ 39.355312] ? putname+0xf2/0x130 [ 39.358749] ? do_sys_open+0x54d/0x700 [ 39.362655] ? __x64_sys_openat+0x9d/0x100 [ 39.366871] ? do_syscall_64+0x1b9/0x820 [ 39.370929] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.376278] ? trace_hardirqs_off+0xb8/0x310 [ 39.380672] ? kasan_check_read+0x11/0x20 [ 39.384813] ? do_raw_spin_unlock+0xa7/0x330 [ 39.389202] ? trace_hardirqs_on+0x310/0x310 [ 39.393612] ? kasan_check_write+0x14/0x20 [ 39.397833] ? trace_hardirqs_off+0xb8/0x310 [ 39.402222] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.407743] ? check_preemption_disabled+0x48/0x280 [ 39.412738] ? check_preemption_disabled+0x48/0x280 [ 39.417741] ? ext4_ioctl_group_add+0x560/0x560 [ 39.422392] do_vfs_ioctl+0x1de/0x1720 [ 39.426278] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 39.431540] ? ioctl_preallocate+0x300/0x300 [ 39.435930] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.441464] ? __fget_light+0x2e9/0x430 [ 39.445437] ? fget_raw+0x20/0x20 [ 39.448868] ? putname+0xf2/0x130 [ 39.452316] ? rcu_read_lock_sched_held+0x108/0x120 [ 39.457313] ? kmem_cache_free+0x24f/0x290 [ 39.461532] ? putname+0xf7/0x130 [ 39.464977] ? do_syscall_64+0x9a/0x820 [ 39.468949] ? do_syscall_64+0x9a/0x820 [ 39.473037] ? lockdep_hardirqs_on+0x421/0x5c0 [ 39.477626] ? security_file_ioctl+0x94/0xc0 [ 39.482038] ksys_ioctl+0xa9/0xd0 [ 39.485473] __x64_sys_ioctl+0x73/0xb0 [ 39.489343] do_syscall_64+0x1b9/0x820 [ 39.493210] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 39.498556] ? syscall_return_slowpath+0x5e0/0x5e0 [ 39.503467] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.508296] ? trace_hardirqs_on_caller+0x310/0x310 [ 39.513297] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 39.518297] ? prepare_exit_to_usermode+0x291/0x3b0 [ 39.523298] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.528129] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.533299] RIP: 0033:0x440009 [ 39.536475] 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 [ 39.555377] RSP: 002b:00007ffd0aa21078 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 39.563091] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 39.570350] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 39.577615] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 39.584954] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 39.592213] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 39.599467] Modules linked in: [ 39.602794] ---[ end trace 16fc8130c6211b61 ]--- [ 39.607604] RIP: 0010:rb_erase+0x306/0x3710 [ 39.611920] 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 [ 39.630882] RSP: 0018:ffff8801baf5e918 EFLAGS: 00010202 [ 39.636373] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 39.643687] RDX: 1ffff100375ebd2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 39.650977] RBP: ffff8801baf5f320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 39.658284] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801c3406530 [ 39.665554] R13: dffffc0000000000 R14: ffff8801baf5f2f8 R15: ffff8801baf5f438 [ 39.672872] FS: 0000000002305880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 39.681130] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.687004] CR2: 0000000020000080 CR3: 00000001baea8000 CR4: 00000000001406e0 [ 39.694303] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.701593] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.708899] Kernel panic - not syncing: Fatal exception [ 39.715113] Kernel Offset: disabled [ 39.718737] Rebooting in 86400 seconds..