[....] 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. [ 26.597107] kauditd_printk_skb: 8 callbacks suppressed [ 26.597118] audit: type=1800 audit(1540245056.676:29): pid=5241 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 [ 26.630636] audit: type=1800 audit(1540245056.676:30): pid=5241 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 '10.128.0.90' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 40.495259] kasan: CONFIG_KASAN_INLINE enabled [ 40.499937] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 40.507382] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 40.513630] CPU: 0 PID: 5396 Comm: syz-executor094 Not tainted 4.19.0+ #297 [ 40.520717] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.530087] RIP: 0010:rb_erase+0x306/0x3710 [ 40.534407] 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 [ 40.553340] RSP: 0018:ffff8801ccea6918 EFLAGS: 00010202 [ 40.558689] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 40.565954] RDX: 1ffff100399d4d2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 40.573215] RBP: ffff8801ccea7320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 40.580505] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801b72ec970 [ 40.587759] R13: dffffc0000000000 R14: ffff8801ccea72f8 R15: ffff8801ccea7438 [ 40.595013] FS: 00000000020d1880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 40.603228] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.609103] CR2: 0000000020000080 CR3: 00000001bb376000 CR4: 00000000001406f0 [ 40.616355] Call Trace: [ 40.618949] ? lockdep_on+0x50/0x50 [ 40.622562] ? rb_insert_color+0x1460/0x1460 [ 40.626955] ? lock_downgrade+0x900/0x900 [ 40.631094] ? noop_count+0x40/0x40 [ 40.634748] ? lock_pin_lock+0x350/0x350 [ 40.638791] ? rcu_bh_qs+0xc0/0xc0 [ 40.642597] ? unwind_dump+0x190/0x190 [ 40.646473] ? kasan_check_read+0x11/0x20 [ 40.650607] ? noop_count+0x40/0x40 [ 40.654216] ? lock_pin_lock+0x350/0x350 [ 40.658258] ? mark_held_locks+0x130/0x130 [ 40.662473] ? check_usage_forwards+0x3e0/0x3e0 [ 40.667122] ? __bfs+0x385/0x7a0 [ 40.670470] ? check_usage+0x1a9/0x790 [ 40.674336] ? lock_pin_lock+0x350/0x350 [ 40.678381] ? check_usage_forwards+0x3e0/0x3e0 [ 40.683027] ? __bfs+0x385/0x7a0 [ 40.686377] ? lockdep_on+0x50/0x50 [ 40.689997] ? lock_pin_lock+0x350/0x350 [ 40.694045] ? mark_held_locks+0x130/0x130 [ 40.698267] ? kasan_check_read+0x11/0x20 [ 40.702398] ? __lock_acquire+0x2881/0x4ec0 [ 40.706721] ? mark_held_locks+0x130/0x130 [ 40.710941] ? print_usage_bug+0xc0/0xc0 [ 40.714985] ? _raw_spin_unlock+0x2c/0x50 [ 40.719113] ? graph_lock+0x170/0x170 [ 40.722898] ? ext4_exit_mballoc+0xc0/0xc0 [ 40.727115] ? __lock_acquire+0x7ec/0x4ec0 [ 40.731334] ? find_held_lock+0x36/0x1c0 [ 40.735381] ? mark_held_locks+0x130/0x130 [ 40.739597] ? lock_downgrade+0x900/0x900 [ 40.743729] ? ext4_es_scan+0x960/0x960 [ 40.748036] ? lock_release+0x970/0x970 [ 40.751992] ? do_raw_write_trylock+0x1c0/0x1c0 [ 40.756662] ? kasan_check_write+0x14/0x20 [ 40.760892] ? lock_acquire+0x1ed/0x520 [ 40.764851] ? integrity_inode_free+0x77/0x320 [ 40.769417] ? ext4_es_remove_extent+0x151/0x500 [ 40.774162] ? lock_release+0x970/0x970 [ 40.778124] ? kasan_check_write+0x14/0x20 [ 40.782346] ? do_raw_write_lock+0xbd/0x1e0 [ 40.786655] integrity_inode_free+0x12f/0x320 [ 40.791141] security_inode_free+0x19/0x90 [ 40.795362] __destroy_inode+0x328/0x820 [ 40.799413] ? generic_update_time+0x450/0x450 [ 40.803991] ? evict+0x5d8/0x980 [ 40.807342] ? lock_downgrade+0x900/0x900 [ 40.811492] ? __inode_wait_for_writeback+0x2cf/0x380 [ 40.816672] destroy_inode+0xda/0x200 [ 40.820458] ? __destroy_inode+0x820/0x820 [ 40.824682] ? kasan_check_write+0x14/0x20 [ 40.828901] ? do_raw_spin_lock+0xc1/0x230 [ 40.833127] evict+0x5e0/0x980 [ 40.836324] ? destroy_inode+0x200/0x200 [ 40.840386] ? iput+0x671/0xa90 [ 40.843651] ? lock_downgrade+0x900/0x900 [ 40.847783] ? kasan_check_read+0x11/0x20 [ 40.851917] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 40.856483] ? lock_downgrade+0x900/0x900 [ 40.860622] iput+0x679/0xa90 [ 40.863715] ? inode_add_lru+0x2a0/0x2a0 [ 40.867761] ? up_write+0x7b/0x220 [ 40.871312] ? up_read+0x110/0x110 [ 40.874837] ? up_read+0x110/0x110 [ 40.878358] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.883881] ? check_preemption_disabled+0x48/0x280 [ 40.888897] ext4_ioctl+0x236f/0x4210 [ 40.892696] ? is_bpf_text_address+0xac/0x170 [ 40.897188] ? ext4_ioctl_group_add+0x560/0x560 [ 40.901847] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 40.907632] ? kasan_check_read+0x11/0x20 [ 40.911775] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 40.917034] ? rcu_bh_qs+0xc0/0xc0 [ 40.920554] ? rcu_bh_qs+0xc0/0xc0 [ 40.924077] ? unwind_dump+0x190/0x190 [ 40.927953] ? is_bpf_text_address+0xd3/0x170 [ 40.932431] ? kernel_text_address+0x79/0xf0 [ 40.936826] ? __kernel_text_address+0xd/0x40 [ 40.941328] ? unwind_get_return_address+0x61/0xa0 [ 40.946256] ? __save_stack_trace+0x8d/0xf0 [ 40.950561] ? save_stack+0xa9/0xd0 [ 40.954168] ? save_stack+0x43/0xd0 [ 40.957789] ? __kasan_slab_free+0x102/0x150 [ 40.962182] ? kasan_slab_free+0xe/0x10 [ 40.966140] ? kmem_cache_free+0x83/0x290 [ 40.970269] ? putname+0xf2/0x130 [ 40.973725] ? do_sys_open+0x54d/0x700 [ 40.977596] ? __x64_sys_openat+0x9d/0x100 [ 40.981828] ? do_syscall_64+0x1b9/0x820 [ 40.985886] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.991246] ? trace_hardirqs_off+0xb8/0x310 [ 40.995635] ? kasan_check_read+0x11/0x20 [ 40.999769] ? do_raw_spin_unlock+0xa7/0x330 [ 41.004158] ? trace_hardirqs_on+0x310/0x310 [ 41.008547] ? kasan_check_write+0x14/0x20 [ 41.012761] ? trace_hardirqs_off+0xb8/0x310 [ 41.017150] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.022674] ? check_preemption_disabled+0x48/0x280 [ 41.027671] ? check_preemption_disabled+0x48/0x280 [ 41.032670] ? ext4_ioctl_group_add+0x560/0x560 [ 41.037327] do_vfs_ioctl+0x1de/0x1720 [ 41.041199] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 41.046458] ? ioctl_preallocate+0x300/0x300 [ 41.050850] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.056369] ? __fget_light+0x2e9/0x430 [ 41.060342] ? fget_raw+0x20/0x20 [ 41.063775] ? putname+0xf2/0x130 [ 41.067211] ? rcu_read_lock_sched_held+0x108/0x120 [ 41.072207] ? kmem_cache_free+0x24f/0x290 [ 41.076423] ? putname+0xf7/0x130 [ 41.079863] ? do_syscall_64+0x9a/0x820 [ 41.083819] ? do_syscall_64+0x9a/0x820 [ 41.087779] ? lockdep_hardirqs_on+0x421/0x5c0 [ 41.092368] ? security_file_ioctl+0x94/0xc0 [ 41.096774] ksys_ioctl+0xa9/0xd0 [ 41.100211] __x64_sys_ioctl+0x73/0xb0 [ 41.104083] do_syscall_64+0x1b9/0x820 [ 41.107953] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 41.113311] ? syscall_return_slowpath+0x5e0/0x5e0 [ 41.118224] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.123063] ? trace_hardirqs_on_caller+0x310/0x310 [ 41.128077] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 41.133098] ? prepare_exit_to_usermode+0x291/0x3b0 [ 41.138100] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.142927] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.148099] RIP: 0033:0x440009 [ 41.151274] 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 [ 41.170162] RSP: 002b:00007ffe5e5507e8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 41.177852] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 41.185102] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 41.192348] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 41.199598] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 41.206848] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 41.214101] Modules linked in: [ 41.217521] ---[ end trace 70231e1e8a19c56d ]--- [ 41.222298] RIP: 0010:rb_erase+0x306/0x3710 [ 41.226641] 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 [ 41.245567] RSP: 0018:ffff8801ccea6918 EFLAGS: 00010202 [ 41.250914] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 41.258198] RDX: 1ffff100399d4d2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 41.265483] RBP: ffff8801ccea7320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 41.272738] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801b72ec970 [ 41.280020] R13: dffffc0000000000 R14: ffff8801ccea72f8 R15: ffff8801ccea7438 [ 41.287319] FS: 00000000020d1880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 41.295562] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.301441] CR2: 0000000020000080 CR3: 00000001bb376000 CR4: 00000000001406f0 [ 41.308729] Kernel panic - not syncing: Fatal exception [ 41.314856] Kernel Offset: disabled [ 41.318478] Rebooting in 86400 seconds..