[....] 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. [ 27.122849] kauditd_printk_skb: 7 callbacks suppressed [ 27.122860] audit: type=1800 audit(1540184839.918:29): pid=5230 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 27.148503] audit: type=1800 audit(1540184839.918:30): pid=5230 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 '10.128.0.121' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 40.958530] kasan: CONFIG_KASAN_INLINE enabled [ 40.963242] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 40.970652] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 40.976941] CPU: 1 PID: 5387 Comm: syz-executor828 Not tainted 4.19.0-rc8+ #73 [ 40.984297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.993641] RIP: 0010:rb_erase+0x306/0x3710 [ 40.997945] 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 [ 41.016830] RSP: 0018:ffff8801ba73e918 EFLAGS: 00010202 [ 41.023047] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 41.030301] RDX: 1ffff100374e7d2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 41.037552] RBP: ffff8801ba73f320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 41.044807] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801b672e970 [ 41.052072] R13: dffffc0000000000 R14: ffff8801ba73f2f8 R15: ffff8801ba73f438 [ 41.059328] FS: 0000000000a02880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 41.067547] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.073427] CR2: 0000000020000080 CR3: 00000001ba045000 CR4: 00000000001406e0 [ 41.080699] Call Trace: [ 41.083279] ? lockdep_on+0x50/0x50 [ 41.086895] ? rb_insert_color+0x1460/0x1460 [ 41.091289] ? lock_downgrade+0x900/0x900 [ 41.095423] ? noop_count+0x40/0x40 [ 41.099034] ? lock_pin_lock+0x350/0x350 [ 41.103080] ? rcu_bh_qs+0xc0/0xc0 [ 41.106604] ? unwind_dump+0x190/0x190 [ 41.110482] ? kasan_check_read+0x11/0x20 [ 41.114614] ? noop_count+0x40/0x40 [ 41.118233] ? lock_pin_lock+0x350/0x350 [ 41.122281] ? mark_held_locks+0x130/0x130 [ 41.126505] ? check_usage_forwards+0x3e0/0x3e0 [ 41.131160] ? __bfs+0x385/0x7a0 [ 41.134512] ? check_usage+0x1a9/0x790 [ 41.138383] ? lock_pin_lock+0x350/0x350 [ 41.142429] ? check_usage_forwards+0x3e0/0x3e0 [ 41.147082] ? __bfs+0x385/0x7a0 [ 41.150433] ? lockdep_on+0x50/0x50 [ 41.154058] ? lock_pin_lock+0x350/0x350 [ 41.158107] ? mark_held_locks+0x130/0x130 [ 41.162337] ? kasan_check_read+0x11/0x20 [ 41.166469] ? __lock_acquire+0x2881/0x4ec0 [ 41.170792] ? mark_held_locks+0x130/0x130 [ 41.175010] ? print_usage_bug+0xc0/0xc0 [ 41.179055] ? _raw_spin_unlock+0x2c/0x50 [ 41.183191] ? graph_lock+0x170/0x170 [ 41.186976] ? ext4_exit_mballoc+0xc0/0xc0 [ 41.191200] ? __lock_acquire+0x7ec/0x4ec0 [ 41.195419] ? find_held_lock+0x36/0x1c0 [ 41.199470] ? mark_held_locks+0x130/0x130 [ 41.203687] ? lock_downgrade+0x900/0x900 [ 41.207820] ? ext4_es_scan+0x960/0x960 [ 41.211787] ? do_raw_write_trylock+0x1c0/0x1c0 [ 41.216461] ? kasan_check_write+0x14/0x20 [ 41.220681] ? lock_acquire+0x1ed/0x520 [ 41.224643] ? integrity_inode_free+0x77/0x320 [ 41.229208] ? ext4_es_remove_extent+0x151/0x500 [ 41.233955] ? lock_release+0x970/0x970 [ 41.237930] ? kasan_check_write+0x14/0x20 [ 41.242154] ? do_raw_write_lock+0xbd/0x1e0 [ 41.246477] integrity_inode_free+0x12f/0x320 [ 41.250983] security_inode_free+0x19/0x90 [ 41.255235] __destroy_inode+0x328/0x820 [ 41.259286] ? generic_update_time+0x450/0x450 [ 41.263853] ? evict+0x5d8/0x980 [ 41.267202] ? lock_downgrade+0x900/0x900 [ 41.271362] ? __inode_wait_for_writeback+0x2cf/0x380 [ 41.276538] destroy_inode+0xda/0x200 [ 41.280328] ? __destroy_inode+0x820/0x820 [ 41.284550] ? kasan_check_write+0x14/0x20 [ 41.288779] ? do_raw_spin_lock+0xc1/0x230 [ 41.293003] evict+0x5e0/0x980 [ 41.296178] ? destroy_inode+0x200/0x200 [ 41.300239] ? iput+0x671/0xa90 [ 41.303512] ? lock_downgrade+0x900/0x900 [ 41.307651] ? kasan_check_read+0x11/0x20 [ 41.311789] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 41.316365] ? lock_downgrade+0x900/0x900 [ 41.320501] iput+0x679/0xa90 [ 41.323609] ? inode_add_lru+0x2a0/0x2a0 [ 41.327664] ? up_write+0x7b/0x220 [ 41.331195] ? up_read+0x110/0x110 [ 41.334734] ? up_read+0x110/0x110 [ 41.338270] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.343796] ? check_preemption_disabled+0x48/0x280 [ 41.348837] ext4_ioctl+0x236f/0x4210 [ 41.352637] ? is_bpf_text_address+0xac/0x170 [ 41.357130] ? ext4_ioctl_group_add+0x560/0x560 [ 41.361814] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 41.367596] ? kasan_check_read+0x11/0x20 [ 41.371731] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 41.376991] ? rcu_bh_qs+0xc0/0xc0 [ 41.380531] ? rcu_bh_qs+0xc0/0xc0 [ 41.384054] ? unwind_dump+0x190/0x190 [ 41.387926] ? is_bpf_text_address+0xd3/0x170 [ 41.392434] ? kernel_text_address+0x79/0xf0 [ 41.396828] ? __kernel_text_address+0xd/0x40 [ 41.401317] ? unwind_get_return_address+0x61/0xa0 [ 41.406246] ? __save_stack_trace+0x8d/0xf0 [ 41.410581] ? save_stack+0xa9/0xd0 [ 41.414205] ? save_stack+0x43/0xd0 [ 41.417844] ? __kasan_slab_free+0x102/0x150 [ 41.422248] ? kasan_slab_free+0xe/0x10 [ 41.426209] ? kmem_cache_free+0x83/0x290 [ 41.430362] ? putname+0xf2/0x130 [ 41.433801] ? do_sys_open+0x54d/0x700 [ 41.437670] ? __x64_sys_openat+0x9d/0x100 [ 41.441903] ? do_syscall_64+0x1b9/0x820 [ 41.445965] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.451332] ? trace_hardirqs_off+0xb8/0x310 [ 41.455724] ? kasan_check_read+0x11/0x20 [ 41.459859] ? do_raw_spin_unlock+0xa7/0x330 [ 41.464253] ? trace_hardirqs_on+0x310/0x310 [ 41.468648] ? kasan_check_write+0x14/0x20 [ 41.472894] ? trace_hardirqs_off+0xb8/0x310 [ 41.477285] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.482810] ? check_preemption_disabled+0x48/0x280 [ 41.487807] ? check_preemption_disabled+0x48/0x280 [ 41.492810] ? ext4_ioctl_group_add+0x560/0x560 [ 41.497471] do_vfs_ioctl+0x1de/0x1720 [ 41.501358] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 41.506619] ? ioctl_preallocate+0x300/0x300 [ 41.511013] ? memset+0x31/0x40 [ 41.514286] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.519815] ? smack_file_ioctl+0x210/0x3c0 [ 41.524122] ? fget_raw+0x20/0x20 [ 41.527560] ? smack_file_lock+0x2e0/0x2e0 [ 41.531786] ? do_syscall_64+0x9a/0x820 [ 41.535746] ? do_syscall_64+0x9a/0x820 [ 41.539711] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.545241] ? security_file_ioctl+0x94/0xc0 [ 41.549639] ksys_ioctl+0xa9/0xd0 [ 41.553078] __x64_sys_ioctl+0x73/0xb0 [ 41.556951] do_syscall_64+0x1b9/0x820 [ 41.560839] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 41.566192] ? syscall_return_slowpath+0x5e0/0x5e0 [ 41.571122] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.575950] ? trace_hardirqs_on_caller+0x310/0x310 [ 41.580950] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 41.586188] ? prepare_exit_to_usermode+0x291/0x3b0 [ 41.591223] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.596065] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.601251] RIP: 0033:0x440009 [ 41.604437] 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 [ 41.623330] RSP: 002b:00007ffeaf067f68 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 41.631034] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 41.638303] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 41.645575] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 41.652828] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 41.660104] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 41.667364] Modules linked in: [ 41.670664] ---[ end trace c6f977f0f81f9f43 ]--- [ 41.675437] RIP: 0010:rb_erase+0x306/0x3710 [ 41.679862] 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 [ 41.698841] RSP: 0018:ffff8801ba73e918 EFLAGS: 00010202 [ 41.704213] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 41.711610] RDX: 1ffff100374e7d2b RSI: ffffffff8afbc860 RDI: 0000000000000008 [ 41.718923] RBP: ffff8801ba73f320 R08: dffffc0000000000 R09: fffffbfff12d6990 [ 41.726197] R10: fffffbfff12d6990 R11: ffffffff896b4c83 R12: ffff8801b672e970 [ 41.733488] R13: dffffc0000000000 R14: ffff8801ba73f2f8 R15: ffff8801ba73f438 [ 41.740781] FS: 0000000000a02880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 41.749024] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.754917] CR2: 0000000020000080 CR3: 00000001ba045000 CR4: 00000000001406e0 [ 41.762208] Kernel panic - not syncing: Fatal exception [ 41.768444] Kernel Offset: disabled [ 41.772068] Rebooting in 86400 seconds..