[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 44.271915] kauditd_printk_skb: 9 callbacks suppressed [ 44.271929] audit: type=1400 audit(1539252695.937:35): avc: denied { map } for pid=5896 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 '10.128.0.76' (ECDSA) to the list of known hosts. executing program [ 50.706954] audit: type=1400 audit(1539252702.367:36): avc: denied { map } for pid=5908 comm="syz-executor797" path="/root/syz-executor797852900" 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 [ 50.710386] kasan: CONFIG_KASAN_INLINE enabled [ 50.738118] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 50.745477] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 50.751703] CPU: 1 PID: 5908 Comm: syz-executor797 Not tainted 4.19.0-rc7+ #57 [ 50.759124] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.768492] RIP: 0010:rb_erase+0x306/0x3710 [ 50.772808] 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 [ 50.791696] RSP: 0018:ffff8801bd56e918 EFLAGS: 00010202 [ 50.797103] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 50.804366] RDX: 1ffff10037aadd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 50.811617] RBP: ffff8801bd56f320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 50.818870] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b7ed0430 [ 50.826123] R13: dffffc0000000000 R14: ffff8801bd56f2f8 R15: ffff8801bd56f438 [ 50.833847] FS: 0000000001bbf880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 50.842171] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.848037] CR2: 0000000020000080 CR3: 00000001ce052000 CR4: 00000000001406e0 [ 50.855295] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 50.862552] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 50.869806] Call Trace: [ 50.872390] ? rb_insert_color+0x1460/0x1460 [ 50.876848] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 50.881774] ? mark_held_locks+0x130/0x130 [ 50.886002] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 50.891786] ? mark_held_locks+0x130/0x130 [ 50.896106] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 50.901367] ? mark_held_locks+0x130/0x130 [ 50.905587] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.911112] ? mark_held_locks+0x130/0x130 [ 50.915328] ? mark_page_accessed+0xcb0/0x2040 [ 50.919893] ? activate_page+0x1040/0x1040 [ 50.924111] ? activate_page+0x1040/0x1040 [ 50.928341] ? pagecache_get_page+0x2d8/0xf00 [ 50.932821] ? find_get_pages_contig+0x15b0/0x15b0 [ 50.937865] ? lock_downgrade+0x900/0x900 [ 50.941998] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 50.947774] ? mark_held_locks+0x130/0x130 [ 50.951991] ? depot_save_stack+0x292/0x470 [ 50.956291] ? mark_held_locks+0x130/0x130 [ 50.960509] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 50.965849] ? lock_downgrade+0x900/0x900 [ 50.969976] ? kasan_check_read+0x11/0x20 [ 50.974101] ? do_raw_spin_unlock+0xa7/0x2f0 [ 50.978495] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 50.983065] ? mark_held_locks+0x130/0x130 [ 50.987291] ? _raw_spin_unlock+0x2c/0x50 [ 50.991423] ? ext4_discard_preallocations+0x18a/0x13c0 [ 50.996774] ? trace_hardirqs_on+0xbd/0x310 [ 51.001097] ? ext4_exit_mballoc+0xc0/0xc0 [ 51.005322] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 51.010367] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 51.015231] ? modules_open+0xa0/0xa0 [ 51.019026] ? __es_tree_search.isra.12+0x1ba/0x220 [ 51.024027] ? __es_remove_extent+0x9a3/0xba0 [ 51.028568] ? mark_held_locks+0x130/0x130 [ 51.032796] ? lock_downgrade+0x900/0x900 [ 51.036924] ? ext4_es_scan+0x960/0x960 [ 51.040876] ? lock_release+0x970/0x970 [ 51.044829] ? trace_hardirqs_on+0xbd/0x310 [ 51.049129] ? kasan_check_read+0x11/0x20 [ 51.053260] ? clear_inode+0x114/0x3a0 [ 51.057126] ? do_raw_write_trylock+0x1c0/0x1c0 [ 51.061774] ? kasan_check_write+0x14/0x20 [ 51.066002] ? lock_acquire+0x1ed/0x520 [ 51.069960] ? integrity_inode_free+0x77/0x320 [ 51.074524] ? ext4_es_remove_extent+0x151/0x500 [ 51.079261] ? lock_release+0x970/0x970 [ 51.083214] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 51.088300] ? depot_save_stack+0x292/0x470 [ 51.092603] ? kasan_check_write+0x14/0x20 [ 51.096931] ? do_raw_write_lock+0xbd/0x1b0 [ 51.101240] integrity_inode_free+0x12f/0x320 [ 51.105720] security_inode_free+0x19/0x90 [ 51.109939] __destroy_inode+0x328/0x820 [ 51.114060] ? generic_update_time+0x450/0x450 [ 51.118627] ? evict+0x5d8/0x980 [ 51.121973] ? lock_downgrade+0x900/0x900 [ 51.126103] ? __inode_wait_for_writeback+0x2cf/0x380 [ 51.131368] destroy_inode+0xda/0x200 [ 51.135157] ? __destroy_inode+0x820/0x820 [ 51.139373] ? kasan_check_write+0x14/0x20 [ 51.143588] ? do_raw_spin_lock+0xc1/0x200 [ 51.147805] evict+0x5e0/0x980 [ 51.150983] ? jbd2_journal_stop+0x430/0x15d0 [ 51.155467] ? destroy_inode+0x200/0x200 [ 51.159513] ? do_raw_spin_lock+0xc1/0x200 [ 51.163726] ? iput+0x671/0xa90 [ 51.166986] ? lock_downgrade+0x900/0x900 [ 51.171147] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 51.176661] ? kasan_check_read+0x11/0x20 [ 51.180795] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 51.185461] ? lock_downgrade+0x900/0x900 [ 51.189676] ? ext4_ioctl+0x231b/0x4210 [ 51.193643] iput+0x679/0xa90 [ 51.196862] ? inode_add_lru+0x2a0/0x2a0 [ 51.200907] ? up_write+0x7b/0x220 [ 51.204494] ? up_read+0x110/0x110 [ 51.208019] ? up_read+0x110/0x110 [ 51.211541] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.217062] ? check_preemption_disabled+0x48/0x200 [ 51.222059] ext4_ioctl+0x236f/0x4210 [ 51.225842] ? ext4_ioctl_group_add+0x560/0x560 [ 51.230495] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 51.236271] ? kasan_check_read+0x11/0x20 [ 51.240397] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 51.245652] ? unwind_dump+0x190/0x190 [ 51.249595] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.255127] ? avc_has_extended_perms+0xab2/0x15a0 [ 51.260046] ? fpu__prepare_read+0x17/0x750 [ 51.264344] ? avc_ss_reset+0x190/0x190 [ 51.268302] ? save_stack+0xa9/0xd0 [ 51.271906] ? save_stack+0x43/0xd0 [ 51.275510] ? __kasan_slab_free+0x102/0x150 [ 51.279894] ? kasan_slab_free+0xe/0x10 [ 51.283848] ? kmem_cache_free+0x83/0x290 [ 51.287974] ? putname+0xf2/0x130 [ 51.291408] ? do_sys_open+0x54d/0x700 [ 51.295275] ? __x64_sys_openat+0x9d/0x100 [ 51.299496] ? do_syscall_64+0x1b9/0x820 [ 51.303574] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.308922] ? trace_hardirqs_off+0xb8/0x310 [ 51.313309] ? kasan_check_read+0x11/0x20 [ 51.317439] ? do_raw_spin_unlock+0xa7/0x2f0 [ 51.321863] ? ___might_sleep+0x1ed/0x300 [ 51.325998] ? arch_local_save_flags+0x40/0x40 [ 51.330558] ? kasan_check_write+0x14/0x20 [ 51.334771] ? trace_hardirqs_off+0xb8/0x310 [ 51.339220] ? ext4_ioctl_group_add+0x560/0x560 [ 51.343932] do_vfs_ioctl+0x1de/0x1720 [ 51.347811] ? ioctl_preallocate+0x300/0x300 [ 51.352205] ? selinux_file_mprotect+0x620/0x620 [ 51.356941] ? putname+0xf2/0x130 [ 51.360379] ? kmem_cache_free+0x21a/0x290 [ 51.364702] ? putname+0xf7/0x130 [ 51.368144] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.373663] ? security_file_ioctl+0x94/0xc0 [ 51.378051] ksys_ioctl+0xa9/0xd0 [ 51.381482] __x64_sys_ioctl+0x73/0xb0 [ 51.385354] do_syscall_64+0x1b9/0x820 [ 51.389221] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 51.394563] ? syscall_return_slowpath+0x5e0/0x5e0 [ 51.399467] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.404295] ? trace_hardirqs_on_caller+0x310/0x310 [ 51.409552] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 51.414732] ? prepare_exit_to_usermode+0x291/0x3b0 [ 51.419743] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.424571] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.429743] RIP: 0033:0x440089 [ 51.432922] 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 [ 51.451808] RSP: 002b:00007ffefa706128 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 51.459497] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440089 [ 51.466751] RDX: 0000000000440089 RSI: 0000000000006611 RDI: 0000000000000003 [ 51.474002] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 51.481297] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401910 [ 51.488557] R13: 00000000004019a0 R14: 0000000000000000 R15: 0000000000000000 [ 51.495818] Modules linked in: [ 51.499368] ---[ end trace 740049a7802cbc87 ]--- [ 51.504185] RIP: 0010:rb_erase+0x306/0x3710 [ 51.508533] 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 [ 51.527436] RSP: 0018:ffff8801bd56e918 EFLAGS: 00010202 [ 51.532793] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 51.540083] RDX: 1ffff10037aadd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 51.547357] RBP: ffff8801bd56f320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 51.554609] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b7ed0430 [ 51.561886] R13: dffffc0000000000 R14: ffff8801bd56f2f8 R15: ffff8801bd56f438 [ 51.569156] FS: 0000000001bbf880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 51.577405] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.583271] CR2: 0000000020000080 CR3: 00000001ce052000 CR4: 00000000001406e0 [ 51.590548] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 51.597817] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 51.605071] Kernel panic - not syncing: Fatal exception [ 51.611419] Kernel Offset: disabled [ 51.615046] Rebooting in 86400 seconds..