[....] 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. [ 25.728396] kauditd_printk_skb: 7 callbacks suppressed [ 25.728423] audit: type=1800 audit(1539968693.356:29): pid=5202 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 [ 25.760231] audit: type=1800 audit(1539968693.356:30): pid=5202 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: [ 39.934561] kasan: CONFIG_KASAN_INLINE enabled [ 39.939302] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 39.946670] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 39.952886] CPU: 1 PID: 5358 Comm: syz-executor984 Not tainted 4.19.0-rc7+ #267 [ 39.960312] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.969673] RIP: 0010:rb_erase+0x306/0x3710 [ 39.974027] 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 [ 39.992912] RSP: 0018:ffff8801cc1fe918 EFLAGS: 00010202 [ 39.998261] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 40.005562] RDX: 1ffff1003983fd2b RSI: ffffffff8afc5020 RDI: 0000000000000008 [ 40.012848] RBP: ffff8801cc1ff320 R08: dffffc0000000000 R09: fffffbfff12d68f0 [ 40.020101] R10: fffffbfff12d68f0 R11: ffffffff896b4783 R12: ffff8801b76bd970 [ 40.027362] R13: dffffc0000000000 R14: ffff8801cc1ff2f8 R15: ffff8801cc1ff438 [ 40.034894] FS: 00000000013c6880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 40.043104] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.048966] CR2: 0000000020000080 CR3: 00000001bc537000 CR4: 00000000001406e0 [ 40.056220] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.063489] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 40.070739] Call Trace: [ 40.073313] ? lockdep_on+0x50/0x50 [ 40.076924] ? rb_insert_color+0x1460/0x1460 [ 40.081326] ? lock_downgrade+0x900/0x900 [ 40.085457] ? noop_count+0x40/0x40 [ 40.089070] ? lock_pin_lock+0x350/0x350 [ 40.093118] ? rcu_bh_qs+0xc0/0xc0 [ 40.096654] ? unwind_dump+0x190/0x190 [ 40.100530] ? kasan_check_read+0x11/0x20 [ 40.104664] ? noop_count+0x40/0x40 [ 40.108273] ? lock_pin_lock+0x350/0x350 [ 40.112314] ? mark_held_locks+0x130/0x130 [ 40.116532] ? check_usage_forwards+0x3e0/0x3e0 [ 40.121185] ? __bfs+0x385/0x7a0 [ 40.124535] ? check_usage+0x1a9/0x790 [ 40.128426] ? lock_pin_lock+0x350/0x350 [ 40.132489] ? check_usage_forwards+0x3e0/0x3e0 [ 40.137142] ? __bfs+0x385/0x7a0 [ 40.140491] ? modules_open+0xa0/0xa0 [ 40.144274] ? lockdep_on+0x50/0x50 [ 40.147883] ? lock_pin_lock+0x350/0x350 [ 40.151935] ? mark_held_locks+0x130/0x130 [ 40.156158] ? kasan_check_read+0x11/0x20 [ 40.160309] ? __lock_acquire+0x2881/0x4ec0 [ 40.164618] ? mark_held_locks+0x130/0x130 [ 40.168842] ? print_usage_bug+0xc0/0xc0 [ 40.172885] ? _raw_spin_unlock+0x2c/0x50 [ 40.177017] ? graph_lock+0x170/0x170 [ 40.180808] ? ext4_exit_mballoc+0xc0/0xc0 [ 40.185026] ? __lock_acquire+0x7ec/0x4ec0 [ 40.189247] ? find_held_lock+0x36/0x1c0 [ 40.193291] ? mark_held_locks+0x130/0x130 [ 40.197523] ? lock_downgrade+0x900/0x900 [ 40.201653] ? ext4_es_scan+0x960/0x960 [ 40.205608] ? lock_release+0x970/0x970 [ 40.209587] ? do_raw_write_trylock+0x1c0/0x1c0 [ 40.214269] ? kasan_check_write+0x14/0x20 [ 40.218573] ? lock_acquire+0x1ed/0x520 [ 40.222530] ? integrity_inode_free+0x77/0x320 [ 40.227094] ? ext4_es_remove_extent+0x151/0x500 [ 40.231837] ? lock_release+0x970/0x970 [ 40.235818] ? kasan_check_write+0x14/0x20 [ 40.240052] ? do_raw_write_lock+0xbd/0x1b0 [ 40.244356] integrity_inode_free+0x12f/0x320 [ 40.248839] security_inode_free+0x19/0x90 [ 40.253055] __destroy_inode+0x328/0x820 [ 40.257111] ? generic_update_time+0x450/0x450 [ 40.261676] ? evict+0x5d8/0x980 [ 40.265039] ? lock_downgrade+0x900/0x900 [ 40.269174] ? __inode_wait_for_writeback+0x2cf/0x380 [ 40.274347] destroy_inode+0xda/0x200 [ 40.278127] ? __destroy_inode+0x820/0x820 [ 40.282359] ? kasan_check_write+0x14/0x20 [ 40.286577] ? do_raw_spin_lock+0xc1/0x200 [ 40.290795] evict+0x5e0/0x980 [ 40.293968] ? destroy_inode+0x200/0x200 [ 40.298016] ? iput+0x671/0xa90 [ 40.301275] ? lock_downgrade+0x900/0x900 [ 40.305406] ? kasan_check_read+0x11/0x20 [ 40.309561] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 40.314127] ? lock_downgrade+0x900/0x900 [ 40.318260] iput+0x679/0xa90 [ 40.321349] ? inode_add_lru+0x2a0/0x2a0 [ 40.325391] ? up_write+0x7b/0x220 [ 40.328913] ? up_read+0x110/0x110 [ 40.332444] ? up_read+0x110/0x110 [ 40.335969] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.341488] ? check_preemption_disabled+0x48/0x200 [ 40.346490] ext4_ioctl+0x236f/0x4210 [ 40.350274] ? is_bpf_text_address+0xac/0x170 [ 40.354754] ? ext4_ioctl_group_add+0x560/0x560 [ 40.359408] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 40.365211] ? kasan_check_read+0x11/0x20 [ 40.369343] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 40.374604] ? rcu_bh_qs+0xc0/0xc0 [ 40.378134] ? rcu_bh_qs+0xc0/0xc0 [ 40.381655] ? unwind_dump+0x190/0x190 [ 40.385524] ? is_bpf_text_address+0xd3/0x170 [ 40.390008] ? kernel_text_address+0x79/0xf0 [ 40.394433] ? __kernel_text_address+0xd/0x40 [ 40.398917] ? unwind_get_return_address+0x61/0xa0 [ 40.403836] ? __save_stack_trace+0x8d/0xf0 [ 40.408147] ? save_stack+0xa9/0xd0 [ 40.411756] ? save_stack+0x43/0xd0 [ 40.415364] ? __kasan_slab_free+0x102/0x150 [ 40.419758] ? kasan_slab_free+0xe/0x10 [ 40.423717] ? kmem_cache_free+0x83/0x290 [ 40.427850] ? putname+0xf2/0x130 [ 40.431302] ? do_sys_open+0x54d/0x700 [ 40.435173] ? __x64_sys_openat+0x9d/0x100 [ 40.439411] ? do_syscall_64+0x1b9/0x820 [ 40.443468] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.448818] ? trace_hardirqs_off+0xb8/0x310 [ 40.453209] ? kasan_check_read+0x11/0x20 [ 40.457345] ? do_raw_spin_unlock+0xa7/0x2f0 [ 40.461736] ? trace_hardirqs_on+0x310/0x310 [ 40.466142] ? kasan_check_write+0x14/0x20 [ 40.470361] ? trace_hardirqs_off+0xb8/0x310 [ 40.474770] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.480291] ? check_preemption_disabled+0x48/0x200 [ 40.485289] ? check_preemption_disabled+0x48/0x200 [ 40.490287] ? ext4_ioctl_group_add+0x560/0x560 [ 40.494943] do_vfs_ioctl+0x1de/0x1720 [ 40.498815] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 40.504072] ? ioctl_preallocate+0x300/0x300 [ 40.508461] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.513980] ? __fget_light+0x2e9/0x430 [ 40.517960] ? fget_raw+0x20/0x20 [ 40.521394] ? putname+0xf2/0x130 [ 40.524830] ? rcu_read_lock_sched_held+0x108/0x120 [ 40.529827] ? kmem_cache_free+0x24f/0x290 [ 40.534059] ? putname+0xf7/0x130 [ 40.537500] ? do_syscall_64+0x9a/0x820 [ 40.541456] ? do_syscall_64+0x9a/0x820 [ 40.545414] ? lockdep_hardirqs_on+0x421/0x5c0 [ 40.549992] ? security_file_ioctl+0x94/0xc0 [ 40.554385] ksys_ioctl+0xa9/0xd0 [ 40.557825] __x64_sys_ioctl+0x73/0xb0 [ 40.561696] do_syscall_64+0x1b9/0x820 [ 40.565579] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 40.570932] ? syscall_return_slowpath+0x5e0/0x5e0 [ 40.575844] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.580684] ? trace_hardirqs_on_caller+0x310/0x310 [ 40.585684] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 40.590684] ? prepare_exit_to_usermode+0x291/0x3b0 [ 40.595683] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.600544] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.605729] RIP: 0033:0x440009 [ 40.608906] 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 [ 40.627791] RSP: 002b:00007ffe40946948 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 40.635483] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 40.642748] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 40.649999] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 40.657246] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 40.664494] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 40.671746] Modules linked in: [ 40.675042] ---[ end trace 31bc56ace54da5b6 ]--- [ 40.679845] RIP: 0010:rb_erase+0x306/0x3710 [ 40.684166] 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 [ 40.703153] RSP: 0018:ffff8801cc1fe918 EFLAGS: 00010202 [ 40.708549] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 40.715815] RDX: 1ffff1003983fd2b RSI: ffffffff8afc5020 RDI: 0000000000000008 [ 40.723202] RBP: ffff8801cc1ff320 R08: dffffc0000000000 R09: fffffbfff12d68f0 [ 40.730506] R10: fffffbfff12d68f0 R11: ffffffff896b4783 R12: ffff8801b76bd970 [ 40.737821] R13: dffffc0000000000 R14: ffff8801cc1ff2f8 R15: ffff8801cc1ff438 [ 40.745088] FS: 00000000013c6880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 40.753327] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.759231] CR2: 0000000020000080 CR3: 00000001bc537000 CR4: 00000000001406e0 [ 40.766498] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.773781] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 40.781075] Kernel panic - not syncing: Fatal exception [ 40.787278] Kernel Offset: disabled [ 40.790902] Rebooting in 86400 seconds..