[....] 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. [ 26.941891] kauditd_printk_skb: 7 callbacks suppressed [ 26.941903] audit: type=1800 audit(1538153255.468:29): pid=5230 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 [ 26.967145] audit: type=1800 audit(1538153255.468:30): pid=5230 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 '10.128.0.23' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.307251] kasan: CONFIG_KASAN_INLINE enabled [ 38.311946] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.319362] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.325616] CPU: 1 PID: 5384 Comm: syz-executor762 Not tainted 4.19.0-rc5+ #235 [ 38.333039] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.342399] RIP: 0010:rb_erase+0x306/0x3710 [ 38.346717] 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 [ 38.365617] RSP: 0018:ffff8801c46d6918 EFLAGS: 00010202 [ 38.370982] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 38.378247] RDX: 1ffff100388dad2b RSI: ffffffff8afc08a0 RDI: 0000000000000008 [ 38.385505] RBP: ffff8801c46d7320 R08: dffffc0000000000 R09: fffffbfff12d6a90 [ 38.392762] R10: fffffbfff12d6a90 R11: ffffffff896b5483 R12: ffff8801b734e1f0 [ 38.400044] R13: dffffc0000000000 R14: ffff8801c46d72f8 R15: ffff8801c46d7438 [ 38.407333] FS: 00000000018c6880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 38.415541] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.421404] CR2: 0000000020000080 CR3: 00000001d8827000 CR4: 00000000001406e0 [ 38.428689] Call Trace: [ 38.431291] ? lockdep_on+0x50/0x50 [ 38.434905] ? rb_insert_color+0x1460/0x1460 [ 38.439312] ? noop_count+0x40/0x40 [ 38.442942] ? lock_pin_lock+0x350/0x350 [ 38.446986] ? noop_count+0x40/0x40 [ 38.450600] ? kasan_check_read+0x11/0x20 [ 38.454729] ? noop_count+0x40/0x40 [ 38.458350] ? noop_count+0x40/0x40 [ 38.461961] ? lock_pin_lock+0x350/0x350 [ 38.466003] ? mark_held_locks+0x130/0x130 [ 38.470240] ? check_usage_forwards+0x3e0/0x3e0 [ 38.474894] ? __bfs+0x385/0x7a0 [ 38.478239] ? noop_count+0x40/0x40 [ 38.481848] ? check_usage+0x1a9/0x790 [ 38.485719] ? lock_pin_lock+0x350/0x350 [ 38.489767] ? check_usage_forwards+0x3e0/0x3e0 [ 38.494416] ? __bfs+0x385/0x7a0 [ 38.497776] ? __lock_acquire+0x7ec/0x4ec0 [ 38.501994] ? lockdep_on+0x50/0x50 [ 38.505603] ? lock_pin_lock+0x350/0x350 [ 38.509659] ? mark_held_locks+0x130/0x130 [ 38.513880] ? kasan_check_read+0x11/0x20 [ 38.518011] ? __lock_acquire+0x2881/0x4ec0 [ 38.522322] ? mark_held_locks+0x130/0x130 [ 38.526540] ? print_usage_bug+0xc0/0xc0 [ 38.530590] ? _raw_spin_unlock+0x2c/0x50 [ 38.534729] ? graph_lock+0x170/0x170 [ 38.538518] ? ext4_exit_mballoc+0xc0/0xc0 [ 38.542746] ? __lock_acquire+0x7ec/0x4ec0 [ 38.546968] ? find_held_lock+0x36/0x1c0 [ 38.551035] ? mark_held_locks+0x130/0x130 [ 38.555259] ? lock_downgrade+0x900/0x900 [ 38.559397] ? ext4_es_scan+0x960/0x960 [ 38.563362] ? do_raw_write_trylock+0x1c0/0x1c0 [ 38.568018] ? kasan_check_write+0x14/0x20 [ 38.572241] ? lock_acquire+0x1ed/0x520 [ 38.576222] ? integrity_inode_free+0x77/0x320 [ 38.580792] ? ext4_es_remove_extent+0x151/0x500 [ 38.585535] ? lock_release+0x970/0x970 [ 38.589498] ? kasan_check_write+0x14/0x20 [ 38.593717] ? do_raw_write_lock+0xbd/0x1b0 [ 38.598023] integrity_inode_free+0x12f/0x320 [ 38.602506] security_inode_free+0x19/0x90 [ 38.606725] __destroy_inode+0x328/0x820 [ 38.610772] ? generic_update_time+0x450/0x450 [ 38.615337] ? evict+0x5d8/0x980 [ 38.618689] ? lock_downgrade+0x900/0x900 [ 38.622822] ? __inode_wait_for_writeback+0x2cf/0x380 [ 38.627996] destroy_inode+0xda/0x200 [ 38.631780] ? __destroy_inode+0x820/0x820 [ 38.635997] ? kasan_check_write+0x14/0x20 [ 38.640215] ? do_raw_spin_lock+0xc1/0x200 [ 38.644435] evict+0x5e0/0x980 [ 38.647611] ? destroy_inode+0x200/0x200 [ 38.651659] ? iput+0x671/0xa90 [ 38.654923] ? lock_downgrade+0x900/0x900 [ 38.659055] ? kasan_check_read+0x11/0x20 [ 38.663190] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 38.667754] ? lock_downgrade+0x900/0x900 [ 38.671891] iput+0x679/0xa90 [ 38.674982] ? inode_add_lru+0x2a0/0x2a0 [ 38.679030] ? up_write+0x7b/0x220 [ 38.682551] ? up_read+0x110/0x110 [ 38.686069] ? up_read+0x110/0x110 [ 38.689596] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.695119] ? check_preemption_disabled+0x48/0x200 [ 38.700123] ext4_ioctl+0x236f/0x4210 [ 38.703909] ? is_bpf_text_address+0xac/0x170 [ 38.708400] ? ext4_ioctl_group_add+0x560/0x560 [ 38.713062] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 38.718859] ? kasan_check_read+0x11/0x20 [ 38.723007] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 38.728267] ? rcu_bh_qs+0xc0/0xc0 [ 38.731813] ? rcu_bh_qs+0xc0/0xc0 [ 38.735336] ? unwind_dump+0x190/0x190 [ 38.739213] ? is_bpf_text_address+0xd3/0x170 [ 38.743696] ? kernel_text_address+0x79/0xf0 [ 38.748088] ? __kernel_text_address+0xd/0x40 [ 38.752568] ? unwind_get_return_address+0x61/0xa0 [ 38.757483] ? __save_stack_trace+0x8d/0xf0 [ 38.761791] ? save_stack+0xa9/0xd0 [ 38.765399] ? save_stack+0x43/0xd0 [ 38.769006] ? __kasan_slab_free+0x102/0x150 [ 38.773396] ? kasan_slab_free+0xe/0x10 [ 38.777364] ? kmem_cache_free+0x83/0x290 [ 38.781511] ? putname+0xf2/0x130 [ 38.784972] ? do_sys_open+0x54d/0x700 [ 38.788867] ? __x64_sys_openat+0x9d/0x100 [ 38.793104] ? do_syscall_64+0x1b9/0x820 [ 38.797168] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.802525] ? trace_hardirqs_off+0xb8/0x310 [ 38.806915] ? kasan_check_read+0x11/0x20 [ 38.811050] ? do_raw_spin_unlock+0xa7/0x2f0 [ 38.815443] ? trace_hardirqs_on+0x310/0x310 [ 38.819838] ? kasan_check_write+0x14/0x20 [ 38.824071] ? trace_hardirqs_off+0xb8/0x310 [ 38.828464] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.833986] ? check_preemption_disabled+0x48/0x200 [ 38.839009] ? check_preemption_disabled+0x48/0x200 [ 38.844023] ? ext4_ioctl_group_add+0x560/0x560 [ 38.848679] do_vfs_ioctl+0x1de/0x1720 [ 38.852554] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 38.857814] ? ioctl_preallocate+0x300/0x300 [ 38.862218] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.867753] ? __fget_light+0x2e9/0x430 [ 38.871717] ? fget_raw+0x20/0x20 [ 38.875154] ? putname+0xf2/0x130 [ 38.878595] ? rcu_read_lock_sched_held+0x108/0x120 [ 38.883612] ? kmem_cache_free+0x24f/0x290 [ 38.887832] ? putname+0xf7/0x130 [ 38.891274] ? do_syscall_64+0x9a/0x820 [ 38.895232] ? do_syscall_64+0x9a/0x820 [ 38.899198] ? lockdep_hardirqs_on+0x421/0x5c0 [ 38.903778] ? security_file_ioctl+0x94/0xc0 [ 38.908171] ksys_ioctl+0xa9/0xd0 [ 38.911616] __x64_sys_ioctl+0x73/0xb0 [ 38.915490] do_syscall_64+0x1b9/0x820 [ 38.919363] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 38.924714] ? syscall_return_slowpath+0x5e0/0x5e0 [ 38.929628] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.934463] ? trace_hardirqs_on_caller+0x310/0x310 [ 38.939464] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 38.944484] ? prepare_exit_to_usermode+0x291/0x3b0 [ 38.949502] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.954348] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.959533] RIP: 0033:0x440089 [ 38.962715] 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 [ 38.981600] RSP: 002b:00007ffe06dd79f8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 38.989295] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440089 [ 38.996565] RDX: 0000000000440089 RSI: 0000000000006611 RDI: 0000000000000003 [ 39.003816] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 39.011069] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401910 [ 39.018330] R13: 00000000004019a0 R14: 0000000000000000 R15: 0000000000000000 [ 39.025592] Modules linked in: [ 39.029100] ---[ end trace a60dfffd8612eb02 ]--- [ 39.033878] RIP: 0010:rb_erase+0x306/0x3710 [ 39.038182] 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 [ 39.057121] RSP: 0018:ffff8801c46d6918 EFLAGS: 00010202 [ 39.062511] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 39.069808] RDX: 1ffff100388dad2b RSI: ffffffff8afc08a0 RDI: 0000000000000008 [ 39.077080] RBP: ffff8801c46d7320 R08: dffffc0000000000 R09: fffffbfff12d6a90 [ 39.084377] R10: fffffbfff12d6a90 R11: ffffffff896b5483 R12: ffff8801b734e1f0 [ 39.091674] R13: dffffc0000000000 R14: ffff8801c46d72f8 R15: ffff8801c46d7438 [ 39.098975] FS: 00000000018c6880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 39.107209] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.113113] CR2: 0000000020000080 CR3: 00000001d8827000 CR4: 00000000001406e0 [ 39.120412] Kernel panic - not syncing: Fatal exception [ 39.126725] Kernel Offset: disabled [ 39.130354] Rebooting in 86400 seconds..