[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.800229] audit: type=1800 audit(1538562470.565:25): pid=5624 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 34.819708] audit: type=1800 audit(1538562470.565:26): pid=5624 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 34.839494] audit: type=1800 audit(1538562470.565:27): pid=5624 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 '10.128.0.55' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 50.696067] kasan: CONFIG_KASAN_INLINE enabled [ 50.700706] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 50.708087] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 50.714488] CPU: 1 PID: 5777 Comm: syz-executor049 Not tainted 4.19.0-rc5+ #125 [ 50.721935] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.731286] RIP: 0010:rb_erase+0x306/0x3710 [ 50.735614] 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 [ 50.754523] RSP: 0018:ffff8801d7d7e918 EFLAGS: 00010202 [ 50.760011] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 50.767273] RDX: 1ffff1003afafd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 50.774538] RBP: ffff8801d7d7f320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 50.781914] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801c3c093f0 [ 50.789291] R13: dffffc0000000000 R14: ffff8801d7d7f2f8 R15: ffff8801d7d7f438 [ 50.796545] FS: 0000000000e1f880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 50.804927] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.810804] CR2: 0000000020000080 CR3: 00000001d7863000 CR4: 00000000001406e0 [ 50.818192] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 50.825583] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 50.833192] Call Trace: [ 50.835796] ? rb_insert_color+0x1460/0x1460 [ 50.840203] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 50.845125] ? lock_downgrade+0x900/0x900 [ 50.849260] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 50.855044] ? mark_held_locks+0x130/0x130 [ 50.859265] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 50.864528] ? rcu_bh_qs+0xc0/0xc0 [ 50.868053] ? unwind_dump+0x190/0x190 [ 50.871932] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.877464] ? mark_held_locks+0x130/0x130 [ 50.881692] ? mark_page_accessed+0xcb0/0x2040 [ 50.886252] ? activate_page+0x1040/0x1040 [ 50.890467] ? activate_page+0x1040/0x1040 [ 50.894689] ? mark_held_locks+0x130/0x130 [ 50.898909] ? kasan_kmalloc+0xc7/0xe0 [ 50.902788] ? kmem_cache_alloc_trace+0x152/0x750 [ 50.907747] ? ima_add_digest_entry+0xcb/0x6a0 [ 50.912327] ? ima_add_template_entry+0x466/0x7f0 [ 50.917159] ? ima_store_template+0x224/0x310 [ 50.921712] ? pagecache_get_page+0x2d8/0xf00 [ 50.926210] ? find_get_pages_contig+0x15b0/0x15b0 [ 50.931239] ? is_bpf_text_address+0xac/0x170 [ 50.935747] ? lock_downgrade+0x900/0x900 [ 50.939879] ? mark_held_locks+0x130/0x130 [ 50.944095] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 50.949874] ? mark_held_locks+0x130/0x130 [ 50.954104] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 50.959457] ? lock_downgrade+0x900/0x900 [ 50.963631] ? kasan_check_read+0x11/0x20 [ 50.967777] ? do_raw_spin_unlock+0xa7/0x2f0 [ 50.972170] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 50.976870] ? mark_held_locks+0x130/0x130 [ 50.981098] ? _raw_spin_unlock+0x2c/0x50 [ 50.985234] ? ext4_discard_preallocations+0x18a/0x13c0 [ 50.990634] ? trace_hardirqs_on+0xbd/0x310 [ 50.994947] ? ext4_exit_mballoc+0xc0/0xc0 [ 50.999167] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 51.004176] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 51.008918] ? modules_open+0xa0/0xa0 [ 51.012718] ? __es_tree_search.isra.12+0x1ba/0x220 [ 51.017733] ? __es_remove_extent+0x9a3/0xba0 [ 51.022334] ? mark_held_locks+0x130/0x130 [ 51.026553] ? lock_downgrade+0x900/0x900 [ 51.030798] ? ext4_es_scan+0x960/0x960 [ 51.034771] ? lock_release+0x970/0x970 [ 51.038766] ? trace_hardirqs_on+0xbd/0x310 [ 51.043071] ? kasan_check_read+0x11/0x20 [ 51.047207] ? clear_inode+0x114/0x3a0 [ 51.051095] ? do_raw_write_trylock+0x1c0/0x1c0 [ 51.055748] ? kasan_check_write+0x14/0x20 [ 51.059966] ? lock_acquire+0x1ed/0x520 [ 51.063964] ? integrity_inode_free+0x77/0x320 [ 51.068533] ? ext4_es_remove_extent+0x151/0x500 [ 51.073392] ? lock_release+0x970/0x970 [ 51.077450] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 51.082542] ? depot_save_stack+0x292/0x470 [ 51.086871] ? kasan_check_write+0x14/0x20 [ 51.091096] ? do_raw_write_lock+0xbd/0x1b0 [ 51.095406] integrity_inode_free+0x12f/0x320 [ 51.099888] security_inode_free+0x19/0x90 [ 51.104165] __destroy_inode+0x328/0x820 [ 51.108229] ? generic_update_time+0x450/0x450 [ 51.112795] ? evict+0x5d8/0x980 [ 51.116149] ? lock_downgrade+0x900/0x900 [ 51.120291] ? __inode_wait_for_writeback+0x2cf/0x380 [ 51.125484] destroy_inode+0xda/0x200 [ 51.129271] ? __destroy_inode+0x820/0x820 [ 51.133490] ? kasan_check_write+0x14/0x20 [ 51.137713] ? do_raw_spin_lock+0xc1/0x200 [ 51.142083] evict+0x5e0/0x980 [ 51.145273] ? jbd2_journal_stop+0x430/0x15d0 [ 51.149755] ? destroy_inode+0x200/0x200 [ 51.153863] ? do_raw_spin_lock+0xc1/0x200 [ 51.158091] ? iput+0x671/0xa90 [ 51.161432] ? lock_downgrade+0x900/0x900 [ 51.165580] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 51.171115] ? kasan_check_read+0x11/0x20 [ 51.175252] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 51.179819] ? lock_downgrade+0x900/0x900 [ 51.183966] ? ext4_ioctl+0x231b/0x4210 [ 51.187979] iput+0x679/0xa90 [ 51.191075] ? inode_add_lru+0x2a0/0x2a0 [ 51.195122] ? up_write+0x7b/0x220 [ 51.198644] ? up_read+0x110/0x110 [ 51.202162] ? up_read+0x110/0x110 [ 51.205689] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.211261] ? check_preemption_disabled+0x48/0x200 [ 51.216365] ext4_ioctl+0x236f/0x4210 [ 51.220158] ? is_bpf_text_address+0xac/0x170 [ 51.224647] ? ext4_ioctl_group_add+0x560/0x560 [ 51.229325] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 51.235113] ? kasan_check_read+0x11/0x20 [ 51.239251] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 51.244641] ? rcu_bh_qs+0xc0/0xc0 [ 51.248164] ? unwind_dump+0x190/0x190 [ 51.252038] ? is_bpf_text_address+0xd3/0x170 [ 51.256520] ? kernel_text_address+0x79/0xf0 [ 51.260913] ? __kernel_text_address+0xd/0x40 [ 51.265415] ? unwind_get_return_address+0x61/0xa0 [ 51.270347] ? __save_stack_trace+0x8d/0xf0 [ 51.274689] ? save_stack+0xa9/0xd0 [ 51.278319] ? save_stack+0x43/0xd0 [ 51.281941] ? __kasan_slab_free+0x102/0x150 [ 51.286341] ? kasan_slab_free+0xe/0x10 [ 51.290308] ? kmem_cache_free+0x83/0x290 [ 51.294436] ? putname+0xf2/0x130 [ 51.297879] ? do_sys_open+0x54d/0x700 [ 51.301758] ? __x64_sys_openat+0x9d/0x100 [ 51.305985] ? do_syscall_64+0x1b9/0x820 [ 51.310040] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.315401] ? trace_hardirqs_off+0xb8/0x310 [ 51.319794] ? kasan_check_read+0x11/0x20 [ 51.323926] ? do_raw_spin_unlock+0xa7/0x2f0 [ 51.328318] ? trace_hardirqs_on+0x310/0x310 [ 51.332769] ? kasan_check_write+0x14/0x20 [ 51.337008] ? trace_hardirqs_off+0xb8/0x310 [ 51.341409] ? trace_hardirqs_on+0x310/0x310 [ 51.345801] ? ext4_ioctl_group_add+0x560/0x560 [ 51.350578] do_vfs_ioctl+0x1de/0x1720 [ 51.354519] ? trace_hardirqs_on+0xbd/0x310 [ 51.358831] ? ioctl_preallocate+0x300/0x300 [ 51.363227] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.368767] ? __fget_light+0x2e9/0x430 [ 51.372722] ? fget_raw+0x20/0x20 [ 51.376159] ? putname+0xf2/0x130 [ 51.379610] ? kmem_cache_free+0x21a/0x290 [ 51.383888] ? putname+0xf7/0x130 [ 51.387440] ? security_file_ioctl+0x94/0xc0 [ 51.391840] ksys_ioctl+0xa9/0xd0 [ 51.395275] __x64_sys_ioctl+0x73/0xb0 [ 51.399163] do_syscall_64+0x1b9/0x820 [ 51.403044] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 51.408399] ? syscall_return_slowpath+0x5e0/0x5e0 [ 51.413420] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.418251] ? trace_hardirqs_on_caller+0x310/0x310 [ 51.423476] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 51.428485] ? prepare_exit_to_usermode+0x291/0x3b0 [ 51.433542] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.438379] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.443550] RIP: 0033:0x4400d9 [ 51.446727] 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 [ 51.465726] RSP: 002b:00007ffeff3fbe48 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 51.473428] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400d9 [ 51.480810] RDX: 0000000020000040 RSI: 0000000000006611 RDI: 0000000000000003 [ 51.488069] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 51.495426] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401960 [ 51.502687] R13: 00000000004019f0 R14: 0000000000000000 R15: 0000000000000000 [ 51.510091] Modules linked in: [ 51.513495] ---[ end trace 399c6650a95941b3 ]--- [ 51.518286] RIP: 0010:rb_erase+0x306/0x3710 [ 51.522601] 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 [ 51.541649] RSP: 0018:ffff8801d7d7e918 EFLAGS: 00010202 [ 51.547010] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 51.554327] RDX: 1ffff1003afafd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 51.561619] RBP: ffff8801d7d7f320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 51.568917] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801c3c093f0 [ 51.576185] R13: dffffc0000000000 R14: ffff8801d7d7f2f8 R15: ffff8801d7d7f438 [ 51.583606] FS: 0000000000e1f880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 51.591853] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.597768] CR2: 0000000020000080 CR3: 00000001d7863000 CR4: 00000000001406e0 [ 51.605039] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 51.612457] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 51.619873] Kernel panic - not syncing: Fatal exception [ 51.625909] Kernel Offset: disabled [ 51.629537] Rebooting in 86400 seconds..