[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 87.489483][ T30] audit: type=1800 audit(1572994889.539:25): pid=12551 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 87.512782][ T30] audit: type=1800 audit(1572994889.569:26): pid=12551 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 87.548170][ T30] audit: type=1800 audit(1572994889.589:27): pid=12551 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 '10.128.0.13' (ECDSA) to the list of known hosts. 2019/11/05 23:01:43 fuzzer started 2019/11/05 23:01:48 dialing manager at 10.128.0.26:39159 2019/11/05 23:01:48 syscalls: 2397 2019/11/05 23:01:48 code coverage: enabled 2019/11/05 23:01:48 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/11/05 23:01:48 extra coverage: enabled 2019/11/05 23:01:48 setuid sandbox: enabled 2019/11/05 23:01:48 namespace sandbox: enabled 2019/11/05 23:01:48 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/05 23:01:48 fault injection: enabled 2019/11/05 23:01:48 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/05 23:01:48 net packet injection: enabled 2019/11/05 23:01:48 net device setup: enabled 2019/11/05 23:01:48 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2019/11/05 23:01:48 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 167.040616][T12705] ===================================================== [ 167.047641][T12705] BUG: KMSAN: use-after-free in kmem_cache_free+0x3df/0x2b70 [ 167.055112][T12705] CPU: 1 PID: 12705 Comm: syz-fuzzer Not tainted 5.4.0-rc5+ #0 [ 167.063614][T12705] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 167.073770][T12705] Call Trace: [ 167.077090][T12705] dump_stack+0x191/0x1f0 [ 167.081543][T12705] kmsan_report+0x128/0x220 [ 167.086049][T12705] __msan_warning+0x73/0xe0 [ 167.090539][T12705] kmem_cache_free+0x3df/0x2b70 [ 167.095374][T12705] ? kmsan_internal_set_origin+0x6a/0xb0 [ 167.100998][T12705] ? kfree_skb+0x473/0x4c0 [ 167.105406][T12705] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 167.111471][T12705] kfree_skb+0x473/0x4c0 [ 167.115698][T12705] ? packet_rcv_spkt+0x68d/0x7c0 [ 167.120620][T12705] packet_rcv_spkt+0x68d/0x7c0 [ 167.125366][T12705] ? packet_rcv+0x2110/0x2110 [ 167.130021][T12705] dev_queue_xmit_nit+0x1125/0x1200 [ 167.135226][T12705] dev_hard_start_xmit+0x21e/0xab0 [ 167.140323][T12705] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 167.146211][T12705] sch_direct_xmit+0x56c/0x18c0 [ 167.151049][T12705] __dev_queue_xmit+0x212d/0x4200 [ 167.156068][T12705] dev_queue_xmit+0x4b/0x60 [ 167.160550][T12705] ip_finish_output2+0x20d6/0x25d0 [ 167.165658][T12705] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 167.171715][T12705] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 167.177693][T12705] __ip_finish_output+0xaf8/0xda0 [ 167.182709][T12705] ip_finish_output+0x2db/0x420 [ 167.187585][T12705] ip_output+0x541/0x610 [ 167.191839][T12705] ? ip_mc_finish_output+0x6d0/0x6d0 [ 167.197130][T12705] ? ip_finish_output+0x420/0x420 [ 167.202135][T12705] __ip_queue_xmit+0x1caf/0x21f0 [ 167.207052][T12705] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 167.213209][T12705] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 167.219264][T12705] ip_queue_xmit+0xcc/0xf0 [ 167.223660][T12705] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 167.229283][T12705] __tcp_transmit_skb+0x40e3/0x5d90 [ 167.234482][T12705] __tcp_send_ack+0x701/0x840 [ 167.239142][T12705] tcp_send_ack+0x68/0x90 [ 167.243453][T12705] tcp_cleanup_rbuf+0x764/0x800 [ 167.248285][T12705] tcp_recvmsg+0x334d/0x4ff0 [ 167.252886][T12705] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 167.258755][T12705] ? tcp_mmap+0x150/0x150 [ 167.263057][T12705] ? tcp_mmap+0x150/0x150 [ 167.267388][T12705] inet_recvmsg+0x237/0x7d0 [ 167.271883][T12705] ? inet_sendpage+0x2c0/0x2c0 [ 167.276627][T12705] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 167.282507][T12705] ? inet_sendpage+0x2c0/0x2c0 [ 167.287245][T12705] ? inet_sendpage+0x2c0/0x2c0 [ 167.291987][T12705] sock_read_iter+0x5be/0x660 [ 167.296650][T12705] ? kernel_sock_ip_overhead+0x340/0x340 [ 167.302276][T12705] __vfs_read+0xa67/0xc90 [ 167.306610][T12705] vfs_read+0x359/0x6f0 [ 167.310749][T12705] ksys_read+0x265/0x430 [ 167.314976][T12705] __se_sys_read+0x92/0xb0 [ 167.319371][T12705] __x64_sys_read+0x4a/0x70 [ 167.323854][T12705] do_syscall_64+0xb6/0x160 [ 167.328337][T12705] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 167.334213][T12705] RIP: 0033:0x47fd44 [ 167.338087][T12705] Code: ff ff cc cc cc cc e8 9b 40 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 45 31 d2 45 31 c0 45 31 c9 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 167.357683][T12705] RSP: 002b:000000c4203a1760 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 167.366070][T12705] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 167.374021][T12705] RDX: 0000000000001000 RSI: 000000c4203b6000 RDI: 0000000000000003 [ 167.381985][T12705] RBP: 000000c4203a17b0 R08: 0000000000000000 R09: 0000000000000000 [ 167.389950][T12705] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 167.397902][T12705] R13: 0000000000000004 R14: 0000000000000002 R15: ffffffffffffffff [ 167.405858][T12705] [ 167.408190][T12705] Uninit was stored to memory at: [ 167.413194][T12705] kmsan_internal_chain_origin+0xbd/0x180 [ 167.418901][T12705] __msan_chain_origin+0x6b/0xd0 [ 167.423813][T12705] ___slab_alloc+0x1dbc/0x1fb0 [ 167.428653][T12705] kmem_cache_alloc+0xadf/0xd20 [ 167.433491][T12705] skb_clone+0x326/0x5d0 [ 167.437811][T12705] dev_queue_xmit_nit+0x539/0x1200 [ 167.442895][T12705] dev_hard_start_xmit+0x21e/0xab0 [ 167.447992][T12705] sch_direct_xmit+0x56c/0x18c0 [ 167.452819][T12705] __dev_queue_xmit+0x212d/0x4200 [ 167.457848][T12705] dev_queue_xmit+0x4b/0x60 [ 167.462347][T12705] ip_finish_output2+0x20d6/0x25d0 [ 167.467435][T12705] __ip_finish_output+0xaf8/0xda0 [ 167.472436][T12705] ip_finish_output+0x2db/0x420 [ 167.477267][T12705] ip_output+0x541/0x610 [ 167.481485][T12705] __ip_queue_xmit+0x1caf/0x21f0 [ 167.486406][T12705] ip_queue_xmit+0xcc/0xf0 [ 167.490800][T12705] __tcp_transmit_skb+0x40e3/0x5d90 [ 167.495973][T12705] __tcp_send_ack+0x701/0x840 [ 167.500626][T12705] tcp_send_ack+0x68/0x90 [ 167.504930][T12705] tcp_cleanup_rbuf+0x764/0x800 [ 167.509771][T12705] tcp_recvmsg+0x334d/0x4ff0 [ 167.514357][T12705] inet_recvmsg+0x237/0x7d0 [ 167.518836][T12705] sock_read_iter+0x5be/0x660 [ 167.523493][T12705] __vfs_read+0xa67/0xc90 [ 167.527810][T12705] vfs_read+0x359/0x6f0 [ 167.531942][T12705] ksys_read+0x265/0x430 [ 167.536160][T12705] __se_sys_read+0x92/0xb0 [ 167.540550][T12705] __x64_sys_read+0x4a/0x70 [ 167.545027][T12705] do_syscall_64+0xb6/0x160 [ 167.549504][T12705] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 167.555364][T12705] [ 167.557681][T12705] Uninit was created at: [ 167.561902][T12705] kmsan_internal_poison_shadow+0x60/0x120 [ 167.567683][T12705] kmsan_slab_free+0x8d/0xf0 [ 167.572251][T12705] kmem_cache_free_bulk+0x3ad9/0x3f10 [ 167.577600][T12705] __kfree_skb_flush+0xb0/0x100 [ 167.582426][T12705] net_rx_action+0x1a5e/0x1aa0 [ 167.587165][T12705] __do_softirq+0x4a1/0x83a [ 167.591644][T12705] irq_exit+0x230/0x280 [ 167.595791][T12705] do_IRQ+0x123/0x360 [ 167.599763][T12705] ret_from_intr+0x0/0x33 [ 167.604068][T12705] finish_lock_switch+0x2b/0x40 [ 167.608894][T12705] finish_task_switch+0xfa/0x2d0 [ 167.613823][T12705] __schedule+0x71b/0x800 [ 167.618129][T12705] schedule+0x19b/0x2d0 [ 167.622258][T12705] schedule_hrtimeout_range_clock+0x2d4/0x510 [ 167.628415][T12705] schedule_hrtimeout_range+0x97/0xb0 [ 167.633841][T12705] do_select+0x2c3c/0x2df0 [ 167.638240][T12705] core_sys_select+0x949/0xe90 [ 167.642985][T12705] __se_sys_pselect6+0x741/0x8e0 [ 167.647902][T12705] __x64_sys_pselect6+0x6e/0x90 [ 167.652734][T12705] do_syscall_64+0xb6/0x160 [ 167.657217][T12705] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 167.663079][T12705] ===================================================== [ 167.669982][T12705] Disabling lock debugging due to kernel taint [ 167.676121][T12705] Kernel panic - not syncing: panic_on_warn set ... [ 167.682700][T12705] CPU: 1 PID: 12705 Comm: syz-fuzzer Tainted: G B 5.4.0-rc5+ #0 [ 167.691608][T12705] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 167.701656][T12705] Call Trace: [ 167.704932][T12705] dump_stack+0x191/0x1f0 [ 167.709243][T12705] panic+0x3c9/0xc1e [ 167.713135][T12705] kmsan_report+0x215/0x220 [ 167.717621][T12705] __msan_warning+0x73/0xe0 [ 167.722104][T12705] kmem_cache_free+0x3df/0x2b70 [ 167.726928][T12705] ? kmsan_internal_set_origin+0x6a/0xb0 [ 167.732549][T12705] ? kfree_skb+0x473/0x4c0 [ 167.736942][T12705] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 167.742996][T12705] kfree_skb+0x473/0x4c0 [ 167.747215][T12705] ? packet_rcv_spkt+0x68d/0x7c0 [ 167.752133][T12705] packet_rcv_spkt+0x68d/0x7c0 [ 167.756879][T12705] ? packet_rcv+0x2110/0x2110 [ 167.761531][T12705] dev_queue_xmit_nit+0x1125/0x1200 [ 167.766718][T12705] dev_hard_start_xmit+0x21e/0xab0 [ 167.771828][T12705] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 167.777712][T12705] sch_direct_xmit+0x56c/0x18c0 [ 167.782553][T12705] __dev_queue_xmit+0x212d/0x4200 [ 167.787567][T12705] dev_queue_xmit+0x4b/0x60 [ 167.792063][T12705] ip_finish_output2+0x20d6/0x25d0 [ 167.797165][T12705] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 167.803210][T12705] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 167.809181][T12705] __ip_finish_output+0xaf8/0xda0 [ 167.814201][T12705] ip_finish_output+0x2db/0x420 [ 167.819036][T12705] ip_output+0x541/0x610 [ 167.823274][T12705] ? ip_mc_finish_output+0x6d0/0x6d0 [ 167.828540][T12705] ? ip_finish_output+0x420/0x420 [ 167.833543][T12705] __ip_queue_xmit+0x1caf/0x21f0 [ 167.838478][T12705] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 167.844351][T12705] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 167.850406][T12705] ip_queue_xmit+0xcc/0xf0 [ 167.854805][T12705] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 167.860418][T12705] __tcp_transmit_skb+0x40e3/0x5d90 [ 167.865624][T12705] __tcp_send_ack+0x701/0x840 [ 167.870299][T12705] tcp_send_ack+0x68/0x90 [ 167.874613][T12705] tcp_cleanup_rbuf+0x764/0x800 [ 167.879446][T12705] tcp_recvmsg+0x334d/0x4ff0 [ 167.884036][T12705] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 167.889906][T12705] ? tcp_mmap+0x150/0x150 [ 167.894225][T12705] ? tcp_mmap+0x150/0x150 [ 167.898531][T12705] inet_recvmsg+0x237/0x7d0 [ 167.903013][T12705] ? inet_sendpage+0x2c0/0x2c0 [ 167.907754][T12705] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 167.913635][T12705] ? inet_sendpage+0x2c0/0x2c0 [ 167.918396][T12705] ? inet_sendpage+0x2c0/0x2c0 [ 167.923154][T12705] sock_read_iter+0x5be/0x660 [ 167.927824][T12705] ? kernel_sock_ip_overhead+0x340/0x340 [ 167.933442][T12705] __vfs_read+0xa67/0xc90 [ 167.937768][T12705] vfs_read+0x359/0x6f0 [ 167.941996][T12705] ksys_read+0x265/0x430 [ 167.946223][T12705] __se_sys_read+0x92/0xb0 [ 167.950619][T12705] __x64_sys_read+0x4a/0x70 [ 167.955148][T12705] do_syscall_64+0xb6/0x160 [ 167.959632][T12705] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 167.965500][T12705] RIP: 0033:0x47fd44 [ 167.969372][T12705] Code: ff ff cc cc cc cc e8 9b 40 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 45 31 d2 45 31 c0 45 31 c9 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 167.988954][T12705] RSP: 002b:000000c4203a1760 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 167.997340][T12705] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 168.005291][T12705] RDX: 0000000000001000 RSI: 000000c4203b6000 RDI: 0000000000000003 [ 168.013266][T12705] RBP: 000000c4203a17b0 R08: 0000000000000000 R09: 0000000000000000 [ 168.021218][T12705] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 168.029184][T12705] R13: 0000000000000004 R14: 0000000000000002 R15: ffffffffffffffff [ 168.038733][T12705] Kernel Offset: disabled [ 168.043065][T12705] Rebooting in 86400 seconds..