[....] 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. [ 27.242392] kauditd_printk_skb: 8 callbacks suppressed [ 27.242415] audit: type=1800 audit(1538156685.834:29): pid=5232 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 27.266634] audit: type=1800 audit(1538156685.844:30): pid=5232 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.46' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 36.990928] kasan: CONFIG_KASAN_INLINE enabled [ 36.995771] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 37.003231] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 37.009463] CPU: 1 PID: 5385 Comm: syz-executor309 Not tainted 4.19.0-rc5+ #35 [ 37.016801] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.026177] RIP: 0010:rb_erase+0x306/0x3710 [ 37.030499] 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 [ 37.049384] RSP: 0018:ffff8801cbf4e918 EFLAGS: 00010202 [ 37.054734] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 37.061984] RDX: 1ffff100397e9d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 37.069235] RBP: ffff8801cbf4f320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 37.076486] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b66858b0 [ 37.083737] R13: dffffc0000000000 R14: ffff8801cbf4f2f8 R15: ffff8801cbf4f438 [ 37.091022] FS: 00000000007bb880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 37.099232] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.105102] CR2: 0000000020000080 CR3: 00000001d7e02000 CR4: 00000000001406e0 [ 37.112374] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.119626] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.126874] Call Trace: [ 37.129447] ? lockdep_on+0x50/0x50 [ 37.133070] ? rb_insert_color+0x1460/0x1460 [ 37.137469] ? noop_count+0x40/0x40 [ 37.141075] ? lock_pin_lock+0x350/0x350 [ 37.145147] ? noop_count+0x40/0x40 [ 37.148759] ? kasan_check_read+0x11/0x20 [ 37.152890] ? noop_count+0x40/0x40 [ 37.156502] ? noop_count+0x40/0x40 [ 37.160110] ? lock_pin_lock+0x350/0x350 [ 37.164172] ? mark_held_locks+0x130/0x130 [ 37.168398] ? check_usage_forwards+0x3e0/0x3e0 [ 37.173061] ? __bfs+0x385/0x7a0 [ 37.176431] ? noop_count+0x40/0x40 [ 37.180040] ? check_usage+0x1a9/0x790 [ 37.183912] ? lock_pin_lock+0x350/0x350 [ 37.187958] ? check_usage_forwards+0x3e0/0x3e0 [ 37.192625] ? __bfs+0x385/0x7a0 [ 37.195975] ? __lock_acquire+0x7ec/0x4ec0 [ 37.200196] ? lockdep_on+0x50/0x50 [ 37.203806] ? lock_pin_lock+0x350/0x350 [ 37.207870] ? mark_held_locks+0x130/0x130 [ 37.212088] ? kasan_check_read+0x11/0x20 [ 37.216234] ? __lock_acquire+0x2881/0x4ec0 [ 37.220541] ? mark_held_locks+0x130/0x130 [ 37.224759] ? print_usage_bug+0xc0/0xc0 [ 37.228801] ? _raw_spin_unlock+0x2c/0x50 [ 37.232933] ? graph_lock+0x170/0x170 [ 37.236721] ? ext4_exit_mballoc+0xc0/0xc0 [ 37.240942] ? __lock_acquire+0x7ec/0x4ec0 [ 37.245159] ? find_held_lock+0x36/0x1c0 [ 37.249207] ? mark_held_locks+0x130/0x130 [ 37.253434] ? lock_downgrade+0x900/0x900 [ 37.257564] ? ext4_es_scan+0x960/0x960 [ 37.261521] ? lock_release+0x970/0x970 [ 37.265480] ? do_raw_write_trylock+0x1c0/0x1c0 [ 37.270131] ? kasan_check_write+0x14/0x20 [ 37.274366] ? lock_acquire+0x1ed/0x520 [ 37.278362] ? integrity_inode_free+0x77/0x320 [ 37.282927] ? ext4_es_remove_extent+0x151/0x500 [ 37.287664] ? lock_release+0x970/0x970 [ 37.291622] ? kasan_check_write+0x14/0x20 [ 37.295840] ? do_raw_write_lock+0xbd/0x1b0 [ 37.300146] integrity_inode_free+0x12f/0x320 [ 37.304625] security_inode_free+0x19/0x90 [ 37.308844] __destroy_inode+0x328/0x820 [ 37.312885] ? generic_update_time+0x450/0x450 [ 37.317450] ? evict+0x5d8/0x980 [ 37.320801] ? lock_downgrade+0x900/0x900 [ 37.324933] ? __inode_wait_for_writeback+0x2cf/0x380 [ 37.330106] destroy_inode+0xda/0x200 [ 37.333890] ? __destroy_inode+0x820/0x820 [ 37.338108] ? kasan_check_write+0x14/0x20 [ 37.342356] ? do_raw_spin_lock+0xc1/0x200 [ 37.346573] evict+0x5e0/0x980 [ 37.349751] ? destroy_inode+0x200/0x200 [ 37.353796] ? iput+0x671/0xa90 [ 37.357058] ? lock_downgrade+0x900/0x900 [ 37.361194] ? kasan_check_read+0x11/0x20 [ 37.365324] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 37.369888] ? lock_downgrade+0x900/0x900 [ 37.374019] iput+0x679/0xa90 [ 37.377109] ? inode_add_lru+0x2a0/0x2a0 [ 37.381169] ? up_write+0x7b/0x220 [ 37.384699] ? up_read+0x110/0x110 [ 37.388753] ? up_read+0x110/0x110 [ 37.392452] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.397975] ? check_preemption_disabled+0x48/0x200 [ 37.402977] ext4_ioctl+0x236f/0x4210 [ 37.406761] ? is_bpf_text_address+0xac/0x170 [ 37.411264] ? ext4_ioctl_group_add+0x560/0x560 [ 37.415920] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 37.421701] ? kasan_check_read+0x11/0x20 [ 37.425835] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 37.431093] ? rcu_bh_qs+0xc0/0xc0 [ 37.434617] ? rcu_bh_qs+0xc0/0xc0 [ 37.438140] ? unwind_dump+0x190/0x190 [ 37.442012] ? is_bpf_text_address+0xd3/0x170 [ 37.446491] ? kernel_text_address+0x79/0xf0 [ 37.450882] ? __kernel_text_address+0xd/0x40 [ 37.455538] ? unwind_get_return_address+0x61/0xa0 [ 37.460484] ? __save_stack_trace+0x8d/0xf0 [ 37.464792] ? save_stack+0xa9/0xd0 [ 37.468407] ? save_stack+0x43/0xd0 [ 37.472013] ? __kasan_slab_free+0x102/0x150 [ 37.476409] ? kasan_slab_free+0xe/0x10 [ 37.480369] ? kmem_cache_free+0x83/0x290 [ 37.484497] ? putname+0xf2/0x130 [ 37.487931] ? do_sys_open+0x54d/0x700 [ 37.491824] ? __x64_sys_openat+0x9d/0x100 [ 37.496044] ? do_syscall_64+0x1b9/0x820 [ 37.500088] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.505436] ? trace_hardirqs_off+0xb8/0x310 [ 37.509826] ? kasan_check_read+0x11/0x20 [ 37.513960] ? do_raw_spin_unlock+0xa7/0x2f0 [ 37.518350] ? trace_hardirqs_on+0x310/0x310 [ 37.522737] ? kasan_check_write+0x14/0x20 [ 37.526975] ? trace_hardirqs_off+0xb8/0x310 [ 37.531371] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.537760] ? check_preemption_disabled+0x48/0x200 [ 37.544063] ? check_preemption_disabled+0x48/0x200 [ 37.550364] ? ext4_ioctl_group_add+0x560/0x560 [ 37.556318] do_vfs_ioctl+0x1de/0x1720 [ 37.560450] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 37.565713] ? ioctl_preallocate+0x300/0x300 [ 37.570102] ? memset+0x31/0x40 [ 37.573383] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.578911] ? smack_file_ioctl+0x210/0x3c0 [ 37.583217] ? fget_raw+0x20/0x20 [ 37.586656] ? smack_file_lock+0x2e0/0x2e0 [ 37.591056] ? do_syscall_64+0x9a/0x820 [ 37.595013] ? do_syscall_64+0x9a/0x820 [ 37.598972] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 37.604513] ? security_file_ioctl+0x94/0xc0 [ 37.608904] ksys_ioctl+0xa9/0xd0 [ 37.612339] __x64_sys_ioctl+0x73/0xb0 [ 37.616217] do_syscall_64+0x1b9/0x820 [ 37.620087] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 37.625435] ? syscall_return_slowpath+0x5e0/0x5e0 [ 37.630344] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.635168] ? trace_hardirqs_on_caller+0x310/0x310 [ 37.640180] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 37.645214] ? prepare_exit_to_usermode+0x291/0x3b0 [ 37.650214] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.655060] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.660229] RIP: 0033:0x440089 [ 37.663413] 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 [ 37.682314] RSP: 002b:00007ffeb07be238 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 37.690005] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440089 [ 37.697255] RDX: 0000000000440089 RSI: 0000000000006611 RDI: 0000000000000003 [ 37.704505] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 37.711771] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401910 [ 37.719022] R13: 00000000004019a0 R14: 0000000000000000 R15: 0000000000000000 [ 37.726276] Modules linked in: [ 37.729602] ---[ end trace 928c37040cd38bef ]--- [ 37.734393] RIP: 0010:rb_erase+0x306/0x3710 [ 37.738804] 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 [ 37.757720] RSP: 0018:ffff8801cbf4e918 EFLAGS: 00010202 [ 37.763109] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 37.770366] RDX: 1ffff100397e9d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 37.777646] RBP: ffff8801cbf4f320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 37.784931] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b66858b0 [ 37.792182] R13: dffffc0000000000 R14: ffff8801cbf4f2f8 R15: ffff8801cbf4f438 [ 37.799473] FS: 00000000007bb880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 37.807711] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.813606] CR2: 0000000020000080 CR3: 00000001d7e02000 CR4: 00000000001406e0 [ 37.820875] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.828214] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.835511] Kernel panic - not syncing: Fatal exception [ 37.841768] Kernel Offset: disabled [ 37.845389] Rebooting in 86400 seconds..