[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.017889] audit: type=1800 audit(1539041069.379:25): pid=5637 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 34.042234] audit: type=1800 audit(1539041069.389:26): pid=5637 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 34.062081] audit: type=1800 audit(1539041069.389:27): pid=5637 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.12' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 46.559092] kasan: CONFIG_KASAN_INLINE enabled [ 46.563856] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 46.571245] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 46.577476] CPU: 1 PID: 5790 Comm: syz-executor952 Not tainted 4.19.0-rc6+ #134 [ 46.584913] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.594275] RIP: 0010:rb_erase+0x306/0x3710 [ 46.598635] 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 [ 46.617536] RSP: 0018:ffff8801bbed6918 EFLAGS: 00010202 [ 46.622882] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 46.630146] RDX: 1ffff100377dad2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 46.637402] RBP: ffff8801bbed7320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 46.644660] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b8f2b1f0 [ 46.651916] R13: dffffc0000000000 R14: ffff8801bbed72f8 R15: ffff8801bbed7438 [ 46.659201] FS: 0000000000822880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 46.667432] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.673296] CR2: 0000000020000380 CR3: 00000001bc094000 CR4: 00000000001406e0 [ 46.680549] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.687906] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.695167] Call Trace: [ 46.697761] ? rb_insert_color+0x1460/0x1460 [ 46.702160] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 46.707073] ? lock_downgrade+0x900/0x900 [ 46.711210] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 46.716991] ? mark_held_locks+0x130/0x130 [ 46.721220] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 46.726488] ? rcu_bh_qs+0xc0/0xc0 [ 46.730031] ? unwind_dump+0x190/0x190 [ 46.733923] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 46.739446] ? mark_held_locks+0x130/0x130 [ 46.743672] ? mark_page_accessed+0xcb0/0x2040 [ 46.748240] ? activate_page+0x1040/0x1040 [ 46.752462] ? activate_page+0x1040/0x1040 [ 46.756689] ? mark_held_locks+0x130/0x130 [ 46.761021] ? kasan_kmalloc+0xc7/0xe0 [ 46.765037] ? kmem_cache_alloc_trace+0x152/0x750 [ 46.769882] ? ima_add_digest_entry+0xcb/0x6a0 [ 46.774453] ? ima_add_template_entry+0x466/0x7f0 [ 46.779282] ? ima_store_template+0x224/0x310 [ 46.783767] ? pagecache_get_page+0x2d8/0xf00 [ 46.788246] ? find_get_pages_contig+0x15b0/0x15b0 [ 46.793163] ? is_bpf_text_address+0xac/0x170 [ 46.797640] ? lock_downgrade+0x900/0x900 [ 46.801767] ? mark_held_locks+0x130/0x130 [ 46.805991] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 46.811769] ? mark_held_locks+0x130/0x130 [ 46.815989] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 46.821347] ? lock_downgrade+0x900/0x900 [ 46.825482] ? kasan_check_read+0x11/0x20 [ 46.829614] ? do_raw_spin_unlock+0xa7/0x2f0 [ 46.834007] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 46.838573] ? mark_held_locks+0x130/0x130 [ 46.842797] ? _raw_spin_unlock+0x2c/0x50 [ 46.846931] ? ext4_discard_preallocations+0x18a/0x13c0 [ 46.852292] ? trace_hardirqs_on+0xbd/0x310 [ 46.856601] ? ext4_exit_mballoc+0xc0/0xc0 [ 46.860825] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 46.865829] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 46.870569] ? modules_open+0xa0/0xa0 [ 46.874353] ? __es_tree_search.isra.12+0x1ba/0x220 [ 46.879349] ? __es_remove_extent+0x9a3/0xba0 [ 46.883827] ? mark_held_locks+0x130/0x130 [ 46.888040] ? lock_downgrade+0x900/0x900 [ 46.892168] ? ext4_es_scan+0x960/0x960 [ 46.896120] ? lock_release+0x970/0x970 [ 46.900075] ? trace_hardirqs_on+0xbd/0x310 [ 46.904374] ? kasan_check_read+0x11/0x20 [ 46.908519] ? clear_inode+0x114/0x3a0 [ 46.912392] ? do_raw_write_trylock+0x1c0/0x1c0 [ 46.917047] ? kasan_check_write+0x14/0x20 [ 46.921270] ? lock_acquire+0x1ed/0x520 [ 46.925230] ? integrity_inode_free+0x77/0x320 [ 46.929796] ? ext4_es_remove_extent+0x151/0x500 [ 46.934534] ? lock_release+0x970/0x970 [ 46.938491] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 46.943574] ? depot_save_stack+0x292/0x470 [ 46.947877] ? kasan_check_write+0x14/0x20 [ 46.952098] ? do_raw_write_lock+0xbd/0x1b0 [ 46.956402] integrity_inode_free+0x12f/0x320 [ 46.960886] security_inode_free+0x19/0x90 [ 46.965108] __destroy_inode+0x328/0x820 [ 46.969159] ? generic_update_time+0x450/0x450 [ 46.973724] ? evict+0x5d8/0x980 [ 46.977079] ? lock_downgrade+0x900/0x900 [ 46.981210] ? __inode_wait_for_writeback+0x2cf/0x380 [ 46.986406] destroy_inode+0xda/0x200 [ 46.990201] ? __destroy_inode+0x820/0x820 [ 46.994425] ? kasan_check_write+0x14/0x20 [ 46.998654] ? do_raw_spin_lock+0xc1/0x200 [ 47.002879] evict+0x5e0/0x980 [ 47.006055] ? jbd2_journal_stop+0x430/0x15d0 [ 47.010533] ? destroy_inode+0x200/0x200 [ 47.014575] ? do_raw_spin_lock+0xc1/0x200 [ 47.018794] ? iput+0x671/0xa90 [ 47.022057] ? lock_downgrade+0x900/0x900 [ 47.026201] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 47.031720] ? kasan_check_read+0x11/0x20 [ 47.035850] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 47.040410] ? lock_downgrade+0x900/0x900 [ 47.044538] ? ext4_ioctl+0x231b/0x4210 [ 47.048507] iput+0x679/0xa90 [ 47.051606] ? inode_add_lru+0x2a0/0x2a0 [ 47.055832] ? up_write+0x7b/0x220 [ 47.059434] ? up_read+0x110/0x110 [ 47.063038] ? up_read+0x110/0x110 [ 47.066582] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.072113] ? check_preemption_disabled+0x48/0x200 [ 47.077116] ext4_ioctl+0x236f/0x4210 [ 47.080903] ? is_bpf_text_address+0xac/0x170 [ 47.085387] ? ext4_ioctl_group_add+0x560/0x560 [ 47.090048] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 47.095829] ? kasan_check_read+0x11/0x20 [ 47.099981] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 47.105246] ? rcu_bh_qs+0xc0/0xc0 [ 47.108768] ? unwind_dump+0x190/0x190 [ 47.112655] ? is_bpf_text_address+0xd3/0x170 [ 47.117139] ? kernel_text_address+0x79/0xf0 [ 47.121539] ? __kernel_text_address+0xd/0x40 [ 47.126032] ? unwind_get_return_address+0x61/0xa0 [ 47.130969] ? __save_stack_trace+0x8d/0xf0 [ 47.135285] ? save_stack+0xa9/0xd0 [ 47.139040] ? save_stack+0x43/0xd0 [ 47.142644] ? __kasan_slab_free+0x102/0x150 [ 47.147034] ? kasan_slab_free+0xe/0x10 [ 47.150989] ? kmem_cache_free+0x83/0x290 [ 47.155121] ? putname+0xf2/0x130 [ 47.158552] ? do_sys_open+0x54d/0x700 [ 47.162513] ? __x64_sys_openat+0x9d/0x100 [ 47.166731] ? do_syscall_64+0x1b9/0x820 [ 47.170774] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.176120] ? trace_hardirqs_off+0xb8/0x310 [ 47.180505] ? kasan_check_read+0x11/0x20 [ 47.184633] ? do_raw_spin_unlock+0xa7/0x2f0 [ 47.189027] ? trace_hardirqs_on+0x310/0x310 [ 47.193419] ? kasan_check_write+0x14/0x20 [ 47.197635] ? trace_hardirqs_off+0xb8/0x310 [ 47.202038] ? trace_hardirqs_on+0x310/0x310 [ 47.206443] ? ext4_ioctl_group_add+0x560/0x560 [ 47.211103] do_vfs_ioctl+0x1de/0x1720 [ 47.214979] ? trace_hardirqs_on+0xbd/0x310 [ 47.219285] ? ioctl_preallocate+0x300/0x300 [ 47.223672] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.229189] ? __fget_light+0x2e9/0x430 [ 47.233155] ? fget_raw+0x20/0x20 [ 47.236595] ? putname+0xf2/0x130 [ 47.240039] ? kmem_cache_free+0x21a/0x290 [ 47.244262] ? putname+0xf7/0x130 [ 47.247703] ? security_file_ioctl+0x94/0xc0 [ 47.252095] ksys_ioctl+0xa9/0xd0 [ 47.255528] __x64_sys_ioctl+0x73/0xb0 [ 47.259401] do_syscall_64+0x1b9/0x820 [ 47.263282] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 47.268800] ? syscall_return_slowpath+0x5e0/0x5e0 [ 47.273711] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.278538] ? trace_hardirqs_on_caller+0x310/0x310 [ 47.283538] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 47.288539] ? prepare_exit_to_usermode+0x291/0x3b0 [ 47.293548] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.298384] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.303559] RIP: 0033:0x440009 [ 47.306739] 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 [ 47.325889] RSP: 002b:00007ffc0e6a61e8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 47.333598] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 47.340847] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 47.348097] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 47.355346] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 47.362764] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 47.370020] Modules linked in: [ 47.373474] ---[ end trace 211fef96b5def1c2 ]--- [ 47.378241] RIP: 0010:rb_erase+0x306/0x3710 [ 47.382612] 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 [ 47.401558] RSP: 0018:ffff8801bbed6918 EFLAGS: 00010202 [ 47.406925] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 47.414747] RDX: 1ffff100377dad2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 47.422056] RBP: ffff8801bbed7320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 47.429343] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b8f2b1f0 [ 47.436637] R13: dffffc0000000000 R14: ffff8801bbed72f8 R15: ffff8801bbed7438 [ 47.443943] FS: 0000000000822880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 47.452203] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.458074] CR2: 0000000020000380 CR3: 00000001bc094000 CR4: 00000000001406e0 [ 47.465364] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 47.472644] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.479931] Kernel panic - not syncing: Fatal exception [ 47.486397] Kernel Offset: disabled [ 47.490021] Rebooting in 86400 seconds..