[....] 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. [ 27.760608] kauditd_printk_skb: 7 callbacks suppressed [ 27.760618] audit: type=1800 audit(1539859597.482:29): pid=5234 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 27.784630] audit: type=1800 audit(1539859597.492:30): pid=5234 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 '10.128.0.12' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 37.661515] kasan: CONFIG_KASAN_INLINE enabled [ 37.666280] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 37.673687] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 37.679938] CPU: 1 PID: 5387 Comm: syz-executor007 Not tainted 4.19.0-rc8+ #66 [ 37.687278] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.696620] RIP: 0010:rb_erase+0x306/0x3710 [ 37.700927] 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 [ 37.719825] RSP: 0018:ffff8801d819e918 EFLAGS: 00010202 [ 37.725175] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 37.732429] RDX: 1ffff1003b033d2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 37.739694] RBP: ffff8801d819f320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 37.746950] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801b6b36970 [ 37.754234] R13: dffffc0000000000 R14: ffff8801d819f2f8 R15: ffff8801d819f438 [ 37.761486] FS: 0000000000edc880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 37.769693] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.775557] CR2: 0000000020000080 CR3: 00000001d7a6b000 CR4: 00000000001406e0 [ 37.782811] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.790077] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.797342] Call Trace: [ 37.799931] ? lockdep_on+0x50/0x50 [ 37.803542] ? rb_insert_color+0x1460/0x1460 [ 37.807930] ? lock_downgrade+0x900/0x900 [ 37.812060] ? noop_count+0x40/0x40 [ 37.815670] ? lock_pin_lock+0x350/0x350 [ 37.819731] ? rcu_bh_qs+0xc0/0xc0 [ 37.823255] ? unwind_dump+0x190/0x190 [ 37.827127] ? kasan_check_read+0x11/0x20 [ 37.831273] ? noop_count+0x40/0x40 [ 37.834898] ? lock_pin_lock+0x350/0x350 [ 37.838942] ? mark_held_locks+0x130/0x130 [ 37.843162] ? check_usage_forwards+0x3e0/0x3e0 [ 37.847811] ? __bfs+0x385/0x7a0 [ 37.851158] ? check_usage+0x1a9/0x790 [ 37.855038] ? lock_pin_lock+0x350/0x350 [ 37.859084] ? check_usage_forwards+0x3e0/0x3e0 [ 37.863735] ? __bfs+0x385/0x7a0 [ 37.867088] ? modules_open+0xa0/0xa0 [ 37.870870] ? lockdep_on+0x50/0x50 [ 37.874480] ? lock_pin_lock+0x350/0x350 [ 37.878527] ? mark_held_locks+0x130/0x130 [ 37.882764] ? kasan_check_read+0x11/0x20 [ 37.886898] ? __lock_acquire+0x2881/0x4ec0 [ 37.891207] ? mark_held_locks+0x130/0x130 [ 37.895441] ? print_usage_bug+0xc0/0xc0 [ 37.899485] ? _raw_spin_unlock+0x2c/0x50 [ 37.903635] ? graph_lock+0x170/0x170 [ 37.907422] ? ext4_exit_mballoc+0xc0/0xc0 [ 37.911657] ? __lock_acquire+0x7ec/0x4ec0 [ 37.915892] ? find_held_lock+0x36/0x1c0 [ 37.920119] ? mark_held_locks+0x130/0x130 [ 37.924344] ? lock_downgrade+0x900/0x900 [ 37.928476] ? ext4_es_scan+0x960/0x960 [ 37.932433] ? lock_release+0x970/0x970 [ 37.936399] ? do_raw_write_trylock+0x1c0/0x1c0 [ 37.941064] ? kasan_check_write+0x14/0x20 [ 37.945301] ? lock_acquire+0x1ed/0x520 [ 37.949258] ? integrity_inode_free+0x77/0x320 [ 37.953825] ? ext4_es_remove_extent+0x151/0x500 [ 37.958564] ? lock_release+0x970/0x970 [ 37.962521] ? kasan_check_write+0x14/0x20 [ 37.966753] ? do_raw_write_lock+0xbd/0x1b0 [ 37.971068] integrity_inode_free+0x12f/0x320 [ 37.975546] security_inode_free+0x19/0x90 [ 37.979761] __destroy_inode+0x328/0x820 [ 37.983802] ? generic_update_time+0x450/0x450 [ 37.988362] ? evict+0x5d8/0x980 [ 37.991709] ? lock_downgrade+0x900/0x900 [ 37.995843] ? __inode_wait_for_writeback+0x2cf/0x380 [ 38.001018] destroy_inode+0xda/0x200 [ 38.004800] ? __destroy_inode+0x820/0x820 [ 38.009013] ? kasan_check_write+0x14/0x20 [ 38.013238] ? do_raw_spin_lock+0xc1/0x200 [ 38.017456] evict+0x5e0/0x980 [ 38.020629] ? destroy_inode+0x200/0x200 [ 38.024674] ? iput+0x671/0xa90 [ 38.027966] ? lock_downgrade+0x900/0x900 [ 38.032094] ? kasan_check_read+0x11/0x20 [ 38.036231] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 38.040794] ? lock_downgrade+0x900/0x900 [ 38.044927] iput+0x679/0xa90 [ 38.048017] ? inode_add_lru+0x2a0/0x2a0 [ 38.052058] ? up_write+0x7b/0x220 [ 38.055583] ? up_read+0x110/0x110 [ 38.059117] ? up_read+0x110/0x110 [ 38.062655] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.068176] ? check_preemption_disabled+0x48/0x200 [ 38.073178] ext4_ioctl+0x236f/0x4210 [ 38.076962] ? is_bpf_text_address+0xac/0x170 [ 38.081436] ? ext4_ioctl_group_add+0x560/0x560 [ 38.086090] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 38.091866] ? kasan_check_read+0x11/0x20 [ 38.095995] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 38.101252] ? rcu_bh_qs+0xc0/0xc0 [ 38.104776] ? rcu_bh_qs+0xc0/0xc0 [ 38.108296] ? unwind_dump+0x190/0x190 [ 38.112168] ? is_bpf_text_address+0xd3/0x170 [ 38.116644] ? kernel_text_address+0x79/0xf0 [ 38.121034] ? __kernel_text_address+0xd/0x40 [ 38.125512] ? unwind_get_return_address+0x61/0xa0 [ 38.130424] ? __save_stack_trace+0x8d/0xf0 [ 38.134730] ? save_stack+0xa9/0xd0 [ 38.138335] ? save_stack+0x43/0xd0 [ 38.141941] ? __kasan_slab_free+0x102/0x150 [ 38.146328] ? kasan_slab_free+0xe/0x10 [ 38.150283] ? kmem_cache_free+0x83/0x290 [ 38.154412] ? putname+0xf2/0x130 [ 38.157847] ? do_sys_open+0x54d/0x700 [ 38.161737] ? __x64_sys_openat+0x9d/0x100 [ 38.165954] ? do_syscall_64+0x1b9/0x820 [ 38.170000] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.175351] ? trace_hardirqs_off+0xb8/0x310 [ 38.179738] ? kasan_check_read+0x11/0x20 [ 38.183887] ? do_raw_spin_unlock+0xa7/0x2f0 [ 38.188280] ? trace_hardirqs_on+0x310/0x310 [ 38.192671] ? kasan_check_write+0x14/0x20 [ 38.196886] ? trace_hardirqs_off+0xb8/0x310 [ 38.201275] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.206794] ? check_preemption_disabled+0x48/0x200 [ 38.211792] ? check_preemption_disabled+0x48/0x200 [ 38.216791] ? ext4_ioctl_group_add+0x560/0x560 [ 38.221441] do_vfs_ioctl+0x1de/0x1720 [ 38.225311] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 38.230572] ? ioctl_preallocate+0x300/0x300 [ 38.234961] ? memset+0x31/0x40 [ 38.238230] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.243753] ? smack_file_ioctl+0x210/0x3c0 [ 38.248055] ? fget_raw+0x20/0x20 [ 38.251489] ? smack_file_lock+0x2e0/0x2e0 [ 38.255710] ? do_syscall_64+0x9a/0x820 [ 38.259663] ? do_syscall_64+0x9a/0x820 [ 38.263637] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.269155] ? security_file_ioctl+0x94/0xc0 [ 38.273549] ksys_ioctl+0xa9/0xd0 [ 38.276989] __x64_sys_ioctl+0x73/0xb0 [ 38.280859] do_syscall_64+0x1b9/0x820 [ 38.284778] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 38.290122] ? syscall_return_slowpath+0x5e0/0x5e0 [ 38.295035] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.299858] ? trace_hardirqs_on_caller+0x310/0x310 [ 38.304858] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 38.309856] ? prepare_exit_to_usermode+0x291/0x3b0 [ 38.314862] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.319689] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.324858] RIP: 0033:0x440009 [ 38.328048] 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 [ 38.346932] RSP: 002b:00007ffdd6e87368 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 38.354624] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 38.361874] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 38.369140] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 38.376396] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 38.383646] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 38.390900] Modules linked in: [ 38.394190] ---[ end trace e7ba3cd88ba2a207 ]--- [ 38.398967] RIP: 0010:rb_erase+0x306/0x3710 [ 38.403309] 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 [ 38.422248] RSP: 0018:ffff8801d819e918 EFLAGS: 00010202 [ 38.427603] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 38.434889] RDX: 1ffff1003b033d2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 38.442162] RBP: ffff8801d819f320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 38.449442] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801b6b36970 [ 38.456722] R13: dffffc0000000000 R14: ffff8801d819f2f8 R15: ffff8801d819f438 [ 38.464009] FS: 0000000000edc880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 38.472261] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.478138] CR2: 0000000020000080 CR3: 00000001d7a6b000 CR4: 00000000001406e0 [ 38.485423] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.492709] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.499966] Kernel panic - not syncing: Fatal exception [ 38.506172] Kernel Offset: disabled [ 38.509793] Rebooting in 86400 seconds..