[....] 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. [ 27.015909] kauditd_printk_skb: 7 callbacks suppressed [ 27.015933] audit: type=1800 audit(1540287197.720:29): pid=5205 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 27.040308] audit: type=1800 audit(1540287197.730:30): pid=5205 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 '10.128.0.21' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 35.495605] kasan: CONFIG_KASAN_INLINE enabled [ 35.500333] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 35.507687] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 35.513941] CPU: 1 PID: 5359 Comm: syz-executor710 Not tainted 4.19.0+ #75 [ 35.520951] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.530304] RIP: 0010:rb_erase+0x306/0x3710 [ 35.534625] 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 [ 35.553533] RSP: 0018:ffff8801b6d56918 EFLAGS: 00010202 [ 35.558893] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 35.566169] RDX: 1ffff10036daad2b RSI: ffffffff8afc0860 RDI: 0000000000000008 [ 35.573427] RBP: ffff8801b6d57320 R08: dffffc0000000000 R09: fffffbfff12d69a0 [ 35.580681] R10: fffffbfff12d69a0 R11: ffffffff896b4d03 R12: ffff8801b6a9a970 [ 35.587959] R13: dffffc0000000000 R14: ffff8801b6d572f8 R15: ffff8801b6d57438 [ 35.595219] FS: 0000000000701880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 35.603430] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.609316] CR2: 0000000020000080 CR3: 00000001d8920000 CR4: 00000000001406e0 [ 35.616589] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.623846] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.631099] Call Trace: [ 35.633676] ? lockdep_on+0x50/0x50 [ 35.637291] ? rb_insert_color+0x1460/0x1460 [ 35.641773] ? lock_downgrade+0x900/0x900 [ 35.645909] ? noop_count+0x40/0x40 [ 35.649525] ? lock_pin_lock+0x350/0x350 [ 35.653574] ? rcu_bh_qs+0xc0/0xc0 [ 35.657099] ? unwind_dump+0x190/0x190 [ 35.660976] ? kasan_check_read+0x11/0x20 [ 35.665114] ? noop_count+0x40/0x40 [ 35.668727] ? lock_pin_lock+0x350/0x350 [ 35.672773] ? mark_held_locks+0x130/0x130 [ 35.676996] ? check_usage_forwards+0x3e0/0x3e0 [ 35.681651] ? __bfs+0x385/0x7a0 [ 35.685008] ? check_usage+0x1a9/0x790 [ 35.688881] ? lock_pin_lock+0x350/0x350 [ 35.692938] ? check_usage_forwards+0x3e0/0x3e0 [ 35.697591] ? __bfs+0x385/0x7a0 [ 35.700948] ? modules_open+0xa0/0xa0 [ 35.704731] ? lockdep_on+0x50/0x50 [ 35.708356] ? lock_pin_lock+0x350/0x350 [ 35.712407] ? mark_held_locks+0x130/0x130 [ 35.716630] ? kasan_check_read+0x11/0x20 [ 35.720762] ? __lock_acquire+0x2881/0x4ec0 [ 35.725073] ? mark_held_locks+0x130/0x130 [ 35.729289] ? print_usage_bug+0xc0/0xc0 [ 35.733346] ? _raw_spin_unlock+0x2c/0x50 [ 35.737478] ? graph_lock+0x170/0x170 [ 35.741268] ? ext4_exit_mballoc+0xc0/0xc0 [ 35.745486] ? __lock_acquire+0x7ec/0x4ec0 [ 35.749719] ? find_held_lock+0x36/0x1c0 [ 35.753777] ? mark_held_locks+0x130/0x130 [ 35.757995] ? lock_downgrade+0x900/0x900 [ 35.762131] ? ext4_es_scan+0x960/0x960 [ 35.766096] ? lock_release+0x970/0x970 [ 35.770059] ? do_raw_write_trylock+0x1c0/0x1c0 [ 35.774713] ? kasan_check_write+0x14/0x20 [ 35.778940] ? lock_acquire+0x1ed/0x520 [ 35.782902] ? integrity_inode_free+0x77/0x320 [ 35.787481] ? ext4_es_remove_extent+0x151/0x500 [ 35.792225] ? lock_release+0x970/0x970 [ 35.796190] ? kasan_check_write+0x14/0x20 [ 35.800411] ? do_raw_write_lock+0xbd/0x1e0 [ 35.804736] integrity_inode_free+0x12f/0x320 [ 35.809218] security_inode_free+0x19/0x90 [ 35.813452] __destroy_inode+0x328/0x820 [ 35.817520] ? generic_update_time+0x450/0x450 [ 35.822104] ? evict+0x5d8/0x980 [ 35.825474] ? lock_downgrade+0x900/0x900 [ 35.829647] ? __inode_wait_for_writeback+0x2cf/0x380 [ 35.834854] destroy_inode+0xda/0x200 [ 35.838638] ? __destroy_inode+0x820/0x820 [ 35.842856] ? kasan_check_write+0x14/0x20 [ 35.847079] ? do_raw_spin_lock+0xc1/0x230 [ 35.851317] evict+0x5e0/0x980 [ 35.854501] ? destroy_inode+0x200/0x200 [ 35.858546] ? iput+0x671/0xa90 [ 35.861813] ? lock_downgrade+0x900/0x900 [ 35.866310] ? kasan_check_read+0x11/0x20 [ 35.870447] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 35.875019] ? lock_downgrade+0x900/0x900 [ 35.879152] iput+0x679/0xa90 [ 35.882244] ? inode_add_lru+0x2a0/0x2a0 [ 35.886311] ? up_write+0x7b/0x220 [ 35.889837] ? up_read+0x110/0x110 [ 35.893358] ? up_read+0x110/0x110 [ 35.896883] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.902404] ? check_preemption_disabled+0x48/0x280 [ 35.907413] ext4_ioctl+0x236f/0x4210 [ 35.911201] ? is_bpf_text_address+0xac/0x170 [ 35.915680] ? ext4_ioctl_group_add+0x560/0x560 [ 35.920337] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 35.926117] ? kasan_check_read+0x11/0x20 [ 35.930251] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 35.935524] ? rcu_bh_qs+0xc0/0xc0 [ 35.939071] ? rcu_bh_qs+0xc0/0xc0 [ 35.942599] ? unwind_dump+0x190/0x190 [ 35.946474] ? is_bpf_text_address+0xd3/0x170 [ 35.950961] ? kernel_text_address+0x79/0xf0 [ 35.955355] ? __kernel_text_address+0xd/0x40 [ 35.959833] ? unwind_get_return_address+0x61/0xa0 [ 35.964747] ? __save_stack_trace+0x8d/0xf0 [ 35.969057] ? save_stack+0xa9/0xd0 [ 35.972685] ? save_stack+0x43/0xd0 [ 35.976295] ? __kasan_slab_free+0x102/0x150 [ 35.980688] ? kasan_slab_free+0xe/0x10 [ 35.984644] ? kmem_cache_free+0x83/0x290 [ 35.988774] ? putname+0xf2/0x130 [ 35.992210] ? do_sys_open+0x54d/0x700 [ 35.996102] ? __x64_sys_openat+0x9d/0x100 [ 36.000355] ? do_syscall_64+0x1b9/0x820 [ 36.004405] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.009766] ? trace_hardirqs_off+0xb8/0x310 [ 36.014188] ? kasan_check_read+0x11/0x20 [ 36.018335] ? do_raw_spin_unlock+0xa7/0x330 [ 36.022742] ? trace_hardirqs_on+0x310/0x310 [ 36.027150] ? kasan_check_write+0x14/0x20 [ 36.031374] ? trace_hardirqs_off+0xb8/0x310 [ 36.035780] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.041303] ? check_preemption_disabled+0x48/0x280 [ 36.046302] ? check_preemption_disabled+0x48/0x280 [ 36.051302] ? ext4_ioctl_group_add+0x560/0x560 [ 36.055982] do_vfs_ioctl+0x1de/0x1720 [ 36.059859] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 36.065124] ? ioctl_preallocate+0x300/0x300 [ 36.069528] ? memset+0x31/0x40 [ 36.072795] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.078317] ? smack_file_ioctl+0x210/0x3c0 [ 36.082625] ? fget_raw+0x20/0x20 [ 36.086066] ? smack_file_lock+0x2e0/0x2e0 [ 36.090304] ? do_syscall_64+0x9a/0x820 [ 36.094262] ? do_syscall_64+0x9a/0x820 [ 36.098221] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.103742] ? security_file_ioctl+0x94/0xc0 [ 36.108134] ksys_ioctl+0xa9/0xd0 [ 36.111595] __x64_sys_ioctl+0x73/0xb0 [ 36.115472] do_syscall_64+0x1b9/0x820 [ 36.119345] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 36.124693] ? syscall_return_slowpath+0x5e0/0x5e0 [ 36.129615] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.134472] ? trace_hardirqs_on_caller+0x310/0x310 [ 36.139481] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 36.144487] ? prepare_exit_to_usermode+0x291/0x3b0 [ 36.149500] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.154334] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.159511] RIP: 0033:0x440009 [ 36.162693] 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 [ 36.181580] RSP: 002b:00007fffe78aee98 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 36.189274] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 36.196528] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 36.203781] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 36.211034] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 36.218285] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 36.225545] Modules linked in: [ 36.228807] ---[ end trace 44056c2e42189460 ]--- [ 36.233726] RIP: 0010:rb_erase+0x306/0x3710 [ 36.238057] 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 [ 36.256992] RSP: 0018:ffff8801b6d56918 EFLAGS: 00010202 [ 36.262370] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 36.269666] RDX: 1ffff10036daad2b RSI: ffffffff8afc0860 RDI: 0000000000000008 [ 36.276942] RBP: ffff8801b6d57320 R08: dffffc0000000000 R09: fffffbfff12d69a0 [ 36.284230] R10: fffffbfff12d69a0 R11: ffffffff896b4d03 R12: ffff8801b6a9a970 [ 36.291520] R13: dffffc0000000000 R14: ffff8801b6d572f8 R15: ffff8801b6d57438 [ 36.298778] FS: 0000000000701880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 36.307019] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.312914] CR2: 0000000020000080 CR3: 00000001d8920000 CR4: 00000000001406e0 [ 36.320221] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.327493] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.334781] Kernel panic - not syncing: Fatal exception [ 36.341040] Kernel Offset: disabled [ 36.344665] Rebooting in 86400 seconds..