[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 30.327828] kauditd_printk_skb: 9 callbacks suppressed [ 30.327840] audit: type=1800 audit(1538593175.921:33): pid=5321 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 30.356345] audit: type=1800 audit(1538593175.921:34): pid=5321 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 35.309718] audit: type=1400 audit(1538593180.901:35): avc: denied { map } for pid=5499 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.33' (ECDSA) to the list of known hosts. executing program [ 41.968847] audit: type=1400 audit(1538593187.561:36): avc: denied { map } for pid=5513 comm="syz-executor786" path="/root/syz-executor786413152" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 41.973921] kasan: CONFIG_KASAN_INLINE enabled [ 42.000001] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 42.007372] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 42.013592] CPU: 1 PID: 5513 Comm: syz-executor786 Not tainted 4.19.0-rc6+ #44 [ 42.020928] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.030291] RIP: 0010:rb_erase+0x306/0x3710 [ 42.034593] 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 [ 42.053485] RSP: 0018:ffff8801c493e918 EFLAGS: 00010202 [ 42.058830] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 42.066081] RDX: 1ffff10038927d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 42.073426] RBP: ffff8801c493f320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 42.080677] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b23783f0 [ 42.087958] R13: dffffc0000000000 R14: ffff8801c493f2f8 R15: ffff8801c493f438 [ 42.095218] FS: 0000000000c00880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 42.103456] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.109323] CR2: 0000000020000700 CR3: 00000001cc18c000 CR4: 00000000001406e0 [ 42.116578] Call Trace: [ 42.119150] ? lockdep_on+0x50/0x50 [ 42.122761] ? rb_insert_color+0x1460/0x1460 [ 42.127154] ? noop_count+0x40/0x40 [ 42.130765] ? lock_pin_lock+0x350/0x350 [ 42.134805] ? noop_count+0x40/0x40 [ 42.138450] ? kasan_check_read+0x11/0x20 [ 42.142591] ? noop_count+0x40/0x40 [ 42.146204] ? noop_count+0x40/0x40 [ 42.149816] ? lock_pin_lock+0x350/0x350 [ 42.153859] ? mark_held_locks+0x130/0x130 [ 42.158082] ? check_usage_forwards+0x3e0/0x3e0 [ 42.162735] ? __bfs+0x385/0x7a0 [ 42.166083] ? noop_count+0x40/0x40 [ 42.169716] ? check_usage+0x1a9/0x790 [ 42.173605] ? lock_pin_lock+0x350/0x350 [ 42.177650] ? check_usage_forwards+0x3e0/0x3e0 [ 42.182303] ? __bfs+0x385/0x7a0 [ 42.185665] ? __lock_acquire+0x7ec/0x4ec0 [ 42.189881] ? lockdep_on+0x50/0x50 [ 42.193491] ? lock_pin_lock+0x350/0x350 [ 42.197539] ? mark_held_locks+0x130/0x130 [ 42.201767] ? kasan_check_read+0x11/0x20 [ 42.205908] ? __lock_acquire+0x2881/0x4ec0 [ 42.210216] ? mark_held_locks+0x130/0x130 [ 42.214453] ? print_usage_bug+0xc0/0xc0 [ 42.218505] ? _raw_spin_unlock+0x2c/0x50 [ 42.222635] ? graph_lock+0x170/0x170 [ 42.226420] ? ext4_exit_mballoc+0xc0/0xc0 [ 42.230637] ? __lock_acquire+0x7ec/0x4ec0 [ 42.234869] ? find_held_lock+0x36/0x1c0 [ 42.238912] ? mark_held_locks+0x130/0x130 [ 42.243133] ? lock_downgrade+0x900/0x900 [ 42.247281] ? ext4_es_scan+0x960/0x960 [ 42.251238] ? lock_release+0x970/0x970 [ 42.255195] ? do_raw_write_trylock+0x1c0/0x1c0 [ 42.259863] ? kasan_check_write+0x14/0x20 [ 42.264078] ? lock_acquire+0x1ed/0x520 [ 42.268034] ? integrity_inode_free+0x77/0x320 [ 42.272598] ? ext4_es_remove_extent+0x151/0x500 [ 42.277334] ? lock_release+0x970/0x970 [ 42.281325] ? kasan_check_write+0x14/0x20 [ 42.285540] ? do_raw_write_lock+0xbd/0x1b0 [ 42.289846] integrity_inode_free+0x12f/0x320 [ 42.294339] security_inode_free+0x19/0x90 [ 42.298555] __destroy_inode+0x328/0x820 [ 42.302610] ? generic_update_time+0x450/0x450 [ 42.307189] ? evict+0x5d8/0x980 [ 42.310562] ? lock_downgrade+0x900/0x900 [ 42.314696] ? __inode_wait_for_writeback+0x2cf/0x380 [ 42.319884] destroy_inode+0xda/0x200 [ 42.323684] ? __destroy_inode+0x820/0x820 [ 42.327903] ? kasan_check_write+0x14/0x20 [ 42.332122] ? do_raw_spin_lock+0xc1/0x200 [ 42.336338] evict+0x5e0/0x980 [ 42.339518] ? destroy_inode+0x200/0x200 [ 42.343571] ? iput+0x671/0xa90 [ 42.346841] ? lock_downgrade+0x900/0x900 [ 42.350986] ? kasan_check_read+0x11/0x20 [ 42.355115] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 42.359708] ? lock_downgrade+0x900/0x900 [ 42.363851] iput+0x679/0xa90 [ 42.366942] ? inode_add_lru+0x2a0/0x2a0 [ 42.371008] ? up_write+0x7b/0x220 [ 42.374549] ? up_read+0x110/0x110 [ 42.378067] ? up_read+0x110/0x110 [ 42.381588] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.387126] ? check_preemption_disabled+0x48/0x200 [ 42.392130] ext4_ioctl+0x236f/0x4210 [ 42.395912] ? ext4_ioctl_group_add+0x560/0x560 [ 42.400569] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 42.406356] ? kasan_check_read+0x11/0x20 [ 42.410489] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 42.415774] ? rcu_bh_qs+0xc0/0xc0 [ 42.419319] ? rcu_bh_qs+0xc0/0xc0 [ 42.422856] ? unwind_dump+0x190/0x190 [ 42.426725] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.432245] ? avc_has_extended_perms+0xab2/0x15a0 [ 42.437155] ? avc_ss_reset+0x190/0x190 [ 42.441112] ? save_stack+0xa9/0xd0 [ 42.444727] ? save_stack+0x43/0xd0 [ 42.448333] ? __kasan_slab_free+0x102/0x150 [ 42.452739] ? kasan_slab_free+0xe/0x10 [ 42.456708] ? kmem_cache_free+0x83/0x290 [ 42.460836] ? putname+0xf2/0x130 [ 42.464270] ? do_sys_open+0x54d/0x700 [ 42.468138] ? __x64_sys_open+0x7e/0xc0 [ 42.472125] ? do_syscall_64+0x1b9/0x820 [ 42.476169] ? kasan_check_read+0x11/0x20 [ 42.480302] ? ___might_sleep+0x1ed/0x300 [ 42.484443] ? arch_local_save_flags+0x40/0x40 [ 42.489009] ? kasan_check_write+0x14/0x20 [ 42.493244] ? trace_hardirqs_off+0xb8/0x310 [ 42.497652] ? ext4_ioctl_group_add+0x560/0x560 [ 42.502306] do_vfs_ioctl+0x1de/0x1720 [ 42.506180] ? ioctl_preallocate+0x300/0x300 [ 42.510595] ? selinux_file_mprotect+0x620/0x620 [ 42.515352] ? rcu_read_lock_sched_held+0x108/0x120 [ 42.520353] ? kmem_cache_free+0x1cb/0x290 [ 42.524572] ? putname+0xf7/0x130 [ 42.528010] ? do_syscall_64+0x9a/0x820 [ 42.531973] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.537495] ? security_file_ioctl+0x94/0xc0 [ 42.541889] ksys_ioctl+0xa9/0xd0 [ 42.545338] __x64_sys_ioctl+0x73/0xb0 [ 42.549211] do_syscall_64+0x1b9/0x820 [ 42.553083] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 42.558432] ? syscall_return_slowpath+0x5e0/0x5e0 [ 42.563345] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.568185] ? trace_hardirqs_on_caller+0x310/0x310 [ 42.573185] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 42.578196] ? prepare_exit_to_usermode+0x291/0x3b0 [ 42.583199] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.588042] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 42.593215] RIP: 0033:0x440029 [ 42.596390] 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 [ 42.615273] RSP: 002b:00007ffe80337f88 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 42.622973] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 42.630251] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000004 [ 42.637522] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 42.644781] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004018b0 [ 42.652033] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 42.659290] Modules linked in: [ 42.662547] ---[ end trace 8b3f1897b0b96405 ]--- [ 42.667345] RIP: 0010:rb_erase+0x306/0x3710 [ 42.671702] 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 [ 42.690654] RSP: 0018:ffff8801c493e918 EFLAGS: 00010202 [ 42.696017] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 42.703325] RDX: 1ffff10038927d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 42.710610] RBP: ffff8801c493f320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 42.717888] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b23783f0 [ 42.725168] R13: dffffc0000000000 R14: ffff8801c493f2f8 R15: ffff8801c493f438 [ 42.732492] FS: 0000000000c00880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 42.740756] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.746649] CR2: 0000000020000700 CR3: 00000001cc18c000 CR4: 00000000001406e0 [ 42.753946] Kernel panic - not syncing: Fatal exception [ 42.760201] Kernel Offset: disabled [ 42.763821] Rebooting in 86400 seconds..