[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 80.298429][ T32] audit: type=1800 audit(1573542718.341:25): pid=11545 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 80.321482][ T32] audit: type=1800 audit(1573542718.361:26): pid=11545 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 80.357644][ T32] audit: type=1800 audit(1573542718.391:27): pid=11545 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 '10.128.15.212' (ECDSA) to the list of known hosts. 2019/11/12 07:12:14 fuzzer started 2019/11/12 07:12:19 dialing manager at 10.128.0.26:44229 2019/11/12 07:12:19 syscalls: 2397 2019/11/12 07:12:19 code coverage: enabled 2019/11/12 07:12:19 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/11/12 07:12:19 extra coverage: enabled 2019/11/12 07:12:19 setuid sandbox: enabled 2019/11/12 07:12:19 namespace sandbox: enabled 2019/11/12 07:12:19 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/12 07:12:19 fault injection: enabled 2019/11/12 07:12:19 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/12 07:12:19 net packet injection: enabled 2019/11/12 07:12:19 net device setup: enabled 2019/11/12 07:12:19 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2019/11/12 07:12:19 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 119.470970][T11697] ===================================================== [ 119.478002][T11697] BUG: KMSAN: use-after-free in kmem_cache_free+0x3df/0x2b70 [ 119.485384][T11697] CPU: 1 PID: 11697 Comm: syz-fuzzer Not tainted 5.4.0-rc5+ #0 [ 119.492929][T11697] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 119.502986][T11697] Call Trace: [ 119.506291][T11697] dump_stack+0x191/0x1f0 [ 119.510634][T11697] kmsan_report+0x128/0x220 [ 119.515211][T11697] __msan_warning+0x73/0xe0 [ 119.519731][T11697] kmem_cache_free+0x3df/0x2b70 [ 119.524594][T11697] ? kmsan_internal_set_origin+0x6a/0xb0 [ 119.530331][T11697] ? kfree_skb+0x473/0x4c0 [ 119.534762][T11697] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 119.540851][T11697] kfree_skb+0x473/0x4c0 [ 119.545277][T11697] ? packet_rcv_spkt+0x68d/0x7c0 [ 119.550234][T11697] packet_rcv_spkt+0x68d/0x7c0 [ 119.555002][T11697] ? packet_rcv+0x2110/0x2110 [ 119.560036][T11697] dev_queue_xmit_nit+0x1125/0x1200 [ 119.565241][T11697] dev_hard_start_xmit+0x21e/0xab0 [ 119.570395][T11697] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 119.576362][T11697] sch_direct_xmit+0x56c/0x18c0 [ 119.581213][T11697] __dev_queue_xmit+0x212d/0x4200 [ 119.586247][T11697] dev_queue_xmit+0x4b/0x60 [ 119.590843][T11697] ip_finish_output2+0x20d6/0x25d0 [ 119.596574][T11697] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 119.602627][T11697] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 119.608602][T11697] __ip_finish_output+0xaf8/0xda0 [ 119.613617][T11697] ip_finish_output+0x2db/0x420 [ 119.618463][T11697] ip_output+0x541/0x610 [ 119.622694][T11697] ? ip_mc_finish_output+0x6d0/0x6d0 [ 119.627965][T11697] ? ip_finish_output+0x420/0x420 [ 119.632976][T11697] __ip_queue_xmit+0x1caf/0x21f0 [ 119.638008][T11697] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 119.643883][T11697] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 119.649935][T11697] ip_queue_xmit+0xcc/0xf0 [ 119.654332][T11697] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 119.659953][T11697] __tcp_transmit_skb+0x40e3/0x5d90 [ 119.665147][T11697] __tcp_send_ack+0x701/0x840 [ 119.669807][T11697] tcp_send_ack+0x68/0x90 [ 119.674114][T11697] tcp_cleanup_rbuf+0x764/0x800 [ 119.678946][T11697] tcp_recvmsg+0x334d/0x4ff0 [ 119.683542][T11697] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 119.689431][T11697] ? tcp_mmap+0x150/0x150 [ 119.693738][T11697] ? tcp_mmap+0x150/0x150 [ 119.698052][T11697] inet_recvmsg+0x237/0x7d0 [ 119.702537][T11697] ? inet_sendpage+0x2c0/0x2c0 [ 119.707280][T11697] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 119.713150][T11697] ? inet_sendpage+0x2c0/0x2c0 [ 119.717894][T11697] ? inet_sendpage+0x2c0/0x2c0 [ 119.722637][T11697] sock_read_iter+0x5be/0x660 [ 119.727310][T11697] ? kernel_sock_ip_overhead+0x340/0x340 [ 119.732926][T11697] __vfs_read+0xa67/0xc90 [ 119.737247][T11697] vfs_read+0x359/0x6f0 [ 119.741385][T11697] ksys_read+0x265/0x430 [ 119.745697][T11697] __se_sys_read+0x92/0xb0 [ 119.750120][T11697] __x64_sys_read+0x4a/0x70 [ 119.754608][T11697] do_syscall_64+0xb6/0x160 [ 119.759100][T11697] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 119.764971][T11697] RIP: 0033:0x47fd44 [ 119.768846][T11697] 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 [ 119.788437][T11697] RSP: 002b:000000c4203e5710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 119.796837][T11697] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 119.804879][T11697] RDX: 0000000000001000 RSI: 000000c42036c000 RDI: 0000000000000003 [ 119.812834][T11697] RBP: 000000c4203e5760 R08: 0000000000000000 R09: 0000000000000000 [ 119.820966][T11697] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010 [ 119.828918][T11697] R13: 0000000000000010 R14: 0000000000000002 R15: ffffffffffffffff [ 119.836891][T11697] [ 119.839201][T11697] Uninit was stored to memory at: [ 119.844255][T11697] kmsan_internal_chain_origin+0xbd/0x180 [ 119.849970][T11697] __msan_chain_origin+0x6b/0xd0 [ 119.854904][T11697] ___slab_alloc+0x1dbc/0x1fb0 [ 119.859647][T11697] kmem_cache_alloc+0xadf/0xd20 [ 119.864482][T11697] skb_clone+0x326/0x5d0 [ 119.868707][T11697] dev_queue_xmit_nit+0x539/0x1200 [ 119.873798][T11697] dev_hard_start_xmit+0x21e/0xab0 [ 119.878902][T11697] sch_direct_xmit+0x56c/0x18c0 [ 119.883776][T11697] __dev_queue_xmit+0x212d/0x4200 [ 119.888818][T11697] dev_queue_xmit+0x4b/0x60 [ 119.893348][T11697] ip_finish_output2+0x20d6/0x25d0 [ 119.898438][T11697] __ip_finish_output+0xaf8/0xda0 [ 119.903448][T11697] ip_finish_output+0x2db/0x420 [ 119.908275][T11697] ip_output+0x541/0x610 [ 119.912505][T11697] __ip_queue_xmit+0x1caf/0x21f0 [ 119.917428][T11697] ip_queue_xmit+0xcc/0xf0 [ 119.921824][T11697] __tcp_transmit_skb+0x40e3/0x5d90 [ 119.926997][T11697] __tcp_send_ack+0x701/0x840 [ 119.931646][T11697] tcp_send_ack+0x68/0x90 [ 119.935948][T11697] tcp_cleanup_rbuf+0x764/0x800 [ 119.940771][T11697] tcp_recvmsg+0x334d/0x4ff0 [ 119.945338][T11697] inet_recvmsg+0x237/0x7d0 [ 119.949827][T11697] sock_read_iter+0x5be/0x660 [ 119.954483][T11697] __vfs_read+0xa67/0xc90 [ 119.958786][T11697] vfs_read+0x359/0x6f0 [ 119.962927][T11697] ksys_read+0x265/0x430 [ 119.967143][T11697] __se_sys_read+0x92/0xb0 [ 119.971536][T11697] __x64_sys_read+0x4a/0x70 [ 119.976014][T11697] do_syscall_64+0xb6/0x160 [ 119.980672][T11697] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 119.986551][T11697] [ 119.988856][T11697] Uninit was created at: [ 119.993088][T11697] kmsan_internal_poison_shadow+0x60/0x120 [ 119.998869][T11697] kmsan_slab_free+0x8d/0xf0 [ 120.003436][T11697] kmem_cache_free_bulk+0x3ad9/0x3f10 [ 120.008795][T11697] __kfree_skb_flush+0xb0/0x100 [ 120.013676][T11697] net_rx_action+0x1a5e/0x1aa0 [ 120.018438][T11697] __do_softirq+0x4a1/0x83a [ 120.023015][T11697] irq_exit+0x230/0x280 [ 120.027221][T11697] do_IRQ+0x123/0x360 [ 120.031243][T11697] ret_from_intr+0x0/0x33 [ 120.035909][T11697] default_idle+0x53/0x90 [ 120.040561][T11697] arch_cpu_idle+0x25/0x30 [ 120.045042][T11697] do_idle+0x1d5/0x780 [ 120.049086][T11697] cpu_startup_entry+0x45/0x50 [ 120.053836][T11697] start_secondary+0x389/0x480 [ 120.058578][T11697] secondary_startup_64+0xa4/0xb0 [ 120.063574][T11697] ===================================================== [ 120.070480][T11697] Disabling lock debugging due to kernel taint [ 120.076605][T11697] Kernel panic - not syncing: panic_on_warn set ... [ 120.083173][T11697] CPU: 1 PID: 11697 Comm: syz-fuzzer Tainted: G B 5.4.0-rc5+ #0 [ 120.092079][T11697] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 120.102373][T11697] Call Trace: [ 120.105647][T11697] dump_stack+0x191/0x1f0 [ 120.109957][T11697] panic+0x3c9/0xc1e [ 120.113843][T11697] kmsan_report+0x215/0x220 [ 120.118328][T11697] __msan_warning+0x73/0xe0 [ 120.122821][T11697] kmem_cache_free+0x3df/0x2b70 [ 120.127648][T11697] ? kmsan_internal_set_origin+0x6a/0xb0 [ 120.133260][T11697] ? kfree_skb+0x473/0x4c0 [ 120.137655][T11697] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 120.143714][T11697] kfree_skb+0x473/0x4c0 [ 120.147936][T11697] ? packet_rcv_spkt+0x68d/0x7c0 [ 120.152858][T11697] packet_rcv_spkt+0x68d/0x7c0 [ 120.157604][T11697] ? packet_rcv+0x2110/0x2110 [ 120.162269][T11697] dev_queue_xmit_nit+0x1125/0x1200 [ 120.167459][T11697] dev_hard_start_xmit+0x21e/0xab0 [ 120.172556][T11697] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 120.178431][T11697] sch_direct_xmit+0x56c/0x18c0 [ 120.183283][T11697] __dev_queue_xmit+0x212d/0x4200 [ 120.188326][T11697] dev_queue_xmit+0x4b/0x60 [ 120.192827][T11697] ip_finish_output2+0x20d6/0x25d0 [ 120.197933][T11697] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 120.204095][T11697] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 120.210096][T11697] __ip_finish_output+0xaf8/0xda0 [ 120.215162][T11697] ip_finish_output+0x2db/0x420 [ 120.219998][T11697] ip_output+0x541/0x610 [ 120.224231][T11697] ? ip_mc_finish_output+0x6d0/0x6d0 [ 120.229497][T11697] ? ip_finish_output+0x420/0x420 [ 120.234720][T11697] __ip_queue_xmit+0x1caf/0x21f0 [ 120.239636][T11697] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 120.245509][T11697] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 120.251569][T11697] ip_queue_xmit+0xcc/0xf0 [ 120.255965][T11697] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 120.261578][T11697] __tcp_transmit_skb+0x40e3/0x5d90 [ 120.266783][T11697] __tcp_send_ack+0x701/0x840 [ 120.271442][T11697] tcp_send_ack+0x68/0x90 [ 120.275749][T11697] tcp_cleanup_rbuf+0x764/0x800 [ 120.280582][T11697] tcp_recvmsg+0x334d/0x4ff0 [ 120.285196][T11697] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 120.291866][T11697] ? tcp_mmap+0x150/0x150 [ 120.296180][T11697] ? tcp_mmap+0x150/0x150 [ 120.300492][T11697] inet_recvmsg+0x237/0x7d0 [ 120.304978][T11697] ? inet_sendpage+0x2c0/0x2c0 [ 120.309721][T11697] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 120.315592][T11697] ? inet_sendpage+0x2c0/0x2c0 [ 120.320331][T11697] ? inet_sendpage+0x2c0/0x2c0 [ 120.325080][T11697] sock_read_iter+0x5be/0x660 [ 120.329760][T11697] ? kernel_sock_ip_overhead+0x340/0x340 [ 120.335380][T11697] __vfs_read+0xa67/0xc90 [ 120.339707][T11697] vfs_read+0x359/0x6f0 [ 120.343862][T11697] ksys_read+0x265/0x430 [ 120.348114][T11697] __se_sys_read+0x92/0xb0 [ 120.352547][T11697] __x64_sys_read+0x4a/0x70 [ 120.357044][T11697] do_syscall_64+0xb6/0x160 [ 120.361554][T11697] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 120.367442][T11697] RIP: 0033:0x47fd44 [ 120.371426][T11697] 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 [ 120.391033][T11697] RSP: 002b:000000c4203e5710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 120.399423][T11697] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 120.407373][T11697] RDX: 0000000000001000 RSI: 000000c42036c000 RDI: 0000000000000003 [ 120.415324][T11697] RBP: 000000c4203e5760 R08: 0000000000000000 R09: 0000000000000000 [ 120.423292][T11697] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010 [ 120.431242][T11697] R13: 0000000000000010 R14: 0000000000000002 R15: ffffffffffffffff [ 120.440793][T11697] Kernel Offset: disabled [ 120.445269][T11697] Rebooting in 86400 seconds..