[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 78.829813][ T31] audit: type=1800 audit(1569690039.892:25): pid=11368 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 78.853686][ T31] audit: type=1800 audit(1569690039.922:26): pid=11368 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 78.888210][ T31] audit: type=1800 audit(1569690039.942:27): pid=11368 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 '10.128.0.252' (ECDSA) to the list of known hosts. 2019/09/28 17:00:55 fuzzer started 2019/09/28 17:00:59 dialing manager at 10.128.0.26:33025 2019/09/28 17:01:03 syscalls: 2385 2019/09/28 17:01:03 code coverage: enabled 2019/09/28 17:01:03 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/09/28 17:01:03 extra coverage: enabled 2019/09/28 17:01:03 setuid sandbox: enabled 2019/09/28 17:01:03 namespace sandbox: enabled 2019/09/28 17:01:03 Android sandbox: /sys/fs/selinux/policy does not exist 2019/09/28 17:01:03 fault injection: enabled 2019/09/28 17:01:03 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/09/28 17:01:03 net packet injection: enabled 2019/09/28 17:01:03 net device setup: enabled syzkaller login: [ 161.556069][T11515] ===================================================== [ 161.563088][T11515] BUG: KMSAN: uninit-value in kfree_skb+0x473/0x4c0 [ 161.569683][T11515] CPU: 1 PID: 11515 Comm: syz-fuzzer Not tainted 5.3.0-rc7+ #0 [ 161.577216][T11515] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 161.587256][T11515] Call Trace: [ 161.590537][T11515] dump_stack+0x191/0x1f0 [ 161.594941][T11515] kmsan_report+0x13a/0x2b0 [ 161.599425][T11515] __msan_warning+0x73/0xe0 [ 161.603908][T11515] kmem_cache_free+0x3df/0x2b70 [ 161.608733][T11515] ? kmsan_internal_set_origin+0x6a/0xb0 [ 161.614363][T11515] ? kfree_skb+0x473/0x4c0 [ 161.618758][T11515] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 161.624811][T11515] kfree_skb+0x473/0x4c0 [ 161.629031][T11515] ? packet_rcv_spkt+0x719/0x840 [ 161.633951][T11515] packet_rcv_spkt+0x719/0x840 [ 161.638705][T11515] ? packet_rcv+0x2190/0x2190 [ 161.643357][T11515] dev_queue_xmit_nit+0x1125/0x1200 [ 161.648545][T11515] dev_hard_start_xmit+0x21e/0xab0 [ 161.653637][T11515] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 161.659513][T11515] sch_direct_xmit+0x56c/0x18c0 [ 161.664368][T11515] __dev_queue_xmit+0x1e53/0x4270 [ 161.669402][T11515] dev_queue_xmit+0x4b/0x60 [ 161.673902][T11515] ip_finish_output2+0x20c6/0x25d0 [ 161.679004][T11515] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 161.685402][T11515] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 161.691373][T11515] __ip_finish_output+0xaf8/0xda0 [ 161.696384][T11515] ip_finish_output+0x2db/0x420 [ 161.701244][T11515] ip_output+0x541/0x610 [ 161.705502][T11515] ? ip_mc_finish_output+0x6d0/0x6d0 [ 161.710789][T11515] ? ip_finish_output+0x420/0x420 [ 161.715799][T11515] __ip_queue_xmit+0x1caf/0x21f0 [ 161.720717][T11515] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 161.726587][T11515] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 161.732893][T11515] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 161.738965][T11515] ip_queue_xmit+0xcc/0xf0 [ 161.743362][T11515] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 161.748970][T11515] __tcp_transmit_skb+0x409e/0x5c60 [ 161.754167][T11515] __tcp_send_ack+0x701/0x840 [ 161.758831][T11515] tcp_send_ack+0x68/0x90 [ 161.763152][T11515] tcp_cleanup_rbuf+0x764/0x800 [ 161.767991][T11515] tcp_recvmsg+0x334d/0x4ff0 [ 161.772581][T11515] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 161.778451][T11515] ? tcp_mmap+0x150/0x150 [ 161.782783][T11515] ? tcp_mmap+0x150/0x150 [ 161.787115][T11515] inet_recvmsg+0x237/0x7d0 [ 161.791617][T11515] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 161.797494][T11515] ? inet_sendpage+0x2c0/0x2c0 [ 161.802237][T11515] ? inet_sendpage+0x2c0/0x2c0 [ 161.806988][T11515] sock_read_iter+0x5be/0x660 [ 161.811651][T11515] ? kernel_sock_ip_overhead+0x340/0x340 [ 161.817273][T11515] __vfs_read+0xa67/0xc90 [ 161.821594][T11515] vfs_read+0x359/0x6f0 [ 161.826696][T11515] ksys_read+0x265/0x430 [ 161.830919][T11515] __se_sys_read+0x92/0xb0 [ 161.835313][T11515] __x64_sys_read+0x4a/0x70 [ 161.839796][T11515] do_syscall_64+0xbc/0xf0 [ 161.844192][T11515] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 161.850059][T11515] RIP: 0033:0x47fd44 [ 161.853929][T11515] 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 [ 161.873523][T11515] RSP: 002b:000000c420399760 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 161.881919][T11515] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 161.889868][T11515] RDX: 0000000000001000 RSI: 000000c42013e000 RDI: 0000000000000003 [ 161.897815][T11515] RBP: 000000c4203997b0 R08: 0000000000000000 R09: 0000000000000000 [ 161.905849][T11515] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010 [ 161.913796][T11515] R13: 0000000000000010 R14: 0000000000000040 R15: ffffffffffffffff [ 161.921758][T11515] [ 161.924064][T11515] Uninit was stored to memory at: [ 161.929072][T11515] kmsan_internal_chain_origin+0xd2/0x170 [ 161.934774][T11515] __msan_chain_origin+0x6b/0xe0 [ 161.939688][T11515] ___slab_alloc+0x1dbc/0x1fb0 [ 161.944427][T11515] kmem_cache_alloc+0xade/0xd10 [ 161.949250][T11515] skb_clone+0x326/0x5d0 [ 161.953473][T11515] dev_queue_xmit_nit+0x539/0x1200 [ 161.958555][T11515] dev_hard_start_xmit+0x21e/0xab0 [ 161.963643][T11515] sch_direct_xmit+0x56c/0x18c0 [ 161.968468][T11515] __dev_queue_xmit+0x1e53/0x4270 [ 161.973464][T11515] dev_queue_xmit+0x4b/0x60 [ 161.977944][T11515] ip_finish_output2+0x20c6/0x25d0 [ 161.983027][T11515] __ip_finish_output+0xaf8/0xda0 [ 161.988026][T11515] ip_finish_output+0x2db/0x420 [ 161.992848][T11515] ip_output+0x541/0x610 [ 161.997065][T11515] __ip_queue_xmit+0x1caf/0x21f0 [ 162.001980][T11515] ip_queue_xmit+0xcc/0xf0 [ 162.006376][T11515] __tcp_transmit_skb+0x409e/0x5c60 [ 162.011548][T11515] __tcp_send_ack+0x701/0x840 [ 162.016201][T11515] tcp_send_ack+0x68/0x90 [ 162.020507][T11515] tcp_cleanup_rbuf+0x764/0x800 [ 162.025330][T11515] tcp_recvmsg+0x334d/0x4ff0 [ 162.029897][T11515] inet_recvmsg+0x237/0x7d0 [ 162.034374][T11515] sock_read_iter+0x5be/0x660 [ 162.039025][T11515] __vfs_read+0xa67/0xc90 [ 162.043331][T11515] vfs_read+0x359/0x6f0 [ 162.047459][T11515] ksys_read+0x265/0x430 [ 162.051674][T11515] __se_sys_read+0x92/0xb0 [ 162.056063][T11515] __x64_sys_read+0x4a/0x70 [ 162.060549][T11515] do_syscall_64+0xbc/0xf0 [ 162.064946][T11515] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 162.070809][T11515] [ 162.073115][T11515] Uninit was created at: [ 162.077332][T11515] kmsan_internal_poison_shadow+0x53/0x100 [ 162.083123][T11515] kmsan_slab_free+0x8d/0x100 [ 162.087787][T11515] kmem_cache_free_bulk+0x3ad9/0x3f50 [ 162.093131][T11515] __kfree_skb_flush+0xb0/0x100 [ 162.097958][T11515] net_rx_action+0x1908/0x1950 [ 162.102711][T11515] __do_softirq+0x4a1/0x83a [ 162.107198][T11515] irq_exit+0x230/0x280 [ 162.111332][T11515] do_IRQ+0x20d/0x3a0 [ 162.115307][T11515] ret_from_intr+0x0/0x33 [ 162.119615][T11515] kmsan_internal_check_memory+0xd7/0x4c0 [ 162.125309][T11515] kmsan_copy_to_user+0xa9/0xb0 [ 162.130135][T11515] copyout+0x16b/0x1f0 [ 162.134191][T11515] _copy_to_iter+0x366/0x26e0 [ 162.138860][T11515] simple_copy_to_iter+0x92/0xb0 [ 162.143779][T11515] __skb_datagram_iter+0x67e/0xf00 [ 162.148866][T11515] skb_copy_datagram_iter+0x29c/0x2b0 [ 162.154238][T11515] tcp_recvmsg+0x1e61/0x4ff0 [ 162.158803][T11515] inet_recvmsg+0x237/0x7d0 [ 162.163280][T11515] sock_read_iter+0x5be/0x660 [ 162.167930][T11515] __vfs_read+0xa67/0xc90 [ 162.172239][T11515] vfs_read+0x359/0x6f0 [ 162.176371][T11515] ksys_read+0x265/0x430 [ 162.180619][T11515] __se_sys_read+0x92/0xb0 [ 162.185028][T11515] __x64_sys_read+0x4a/0x70 [ 162.189511][T11515] do_syscall_64+0xbc/0xf0 [ 162.193906][T11515] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 162.199776][T11515] ===================================================== [ 162.206697][T11515] Disabling lock debugging due to kernel taint [ 162.212910][T11515] Kernel panic - not syncing: panic_on_warn set ... [ 162.219490][T11515] CPU: 1 PID: 11515 Comm: syz-fuzzer Tainted: G B 5.3.0-rc7+ #0 [ 162.228401][T11515] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 162.238624][T11515] Call Trace: [ 162.241921][T11515] dump_stack+0x191/0x1f0 [ 162.246249][T11515] panic+0x3c9/0xc1e [ 162.250150][T11515] kmsan_report+0x2a2/0x2b0 [ 162.254657][T11515] __msan_warning+0x73/0xe0 [ 162.259144][T11515] kmem_cache_free+0x3df/0x2b70 [ 162.264004][T11515] ? kmsan_internal_set_origin+0x6a/0xb0 [ 162.269628][T11515] ? kfree_skb+0x473/0x4c0 [ 162.274031][T11515] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 162.280439][T11515] kfree_skb+0x473/0x4c0 [ 162.284685][T11515] ? packet_rcv_spkt+0x719/0x840 [ 162.289613][T11515] packet_rcv_spkt+0x719/0x840 [ 162.294362][T11515] ? packet_rcv+0x2190/0x2190 [ 162.299017][T11515] dev_queue_xmit_nit+0x1125/0x1200 [ 162.304211][T11515] dev_hard_start_xmit+0x21e/0xab0 [ 162.309310][T11515] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 162.315197][T11515] sch_direct_xmit+0x56c/0x18c0 [ 162.320052][T11515] __dev_queue_xmit+0x1e53/0x4270 [ 162.325075][T11515] dev_queue_xmit+0x4b/0x60 [ 162.329558][T11515] ip_finish_output2+0x20c6/0x25d0 [ 162.334666][T11515] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 162.340738][T11515] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 162.346716][T11515] __ip_finish_output+0xaf8/0xda0 [ 162.351732][T11515] ip_finish_output+0x2db/0x420 [ 162.356570][T11515] ip_output+0x541/0x610 [ 162.360799][T11515] ? ip_mc_finish_output+0x6d0/0x6d0 [ 162.366062][T11515] ? ip_finish_output+0x420/0x420 [ 162.371065][T11515] __ip_queue_xmit+0x1caf/0x21f0 [ 162.375997][T11515] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 162.381869][T11515] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 162.387930][T11515] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 162.394003][T11515] ip_queue_xmit+0xcc/0xf0 [ 162.398402][T11515] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 162.404029][T11515] __tcp_transmit_skb+0x409e/0x5c60 [ 162.409230][T11515] __tcp_send_ack+0x701/0x840 [ 162.413891][T11515] tcp_send_ack+0x68/0x90 [ 162.418199][T11515] tcp_cleanup_rbuf+0x764/0x800 [ 162.423045][T11515] tcp_recvmsg+0x334d/0x4ff0 [ 162.427644][T11515] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 162.433534][T11515] ? tcp_mmap+0x150/0x150 [ 162.437844][T11515] ? tcp_mmap+0x150/0x150 [ 162.442172][T11515] inet_recvmsg+0x237/0x7d0 [ 162.446707][T11515] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 162.452604][T11515] ? inet_sendpage+0x2c0/0x2c0 [ 162.457356][T11515] ? inet_sendpage+0x2c0/0x2c0 [ 162.462118][T11515] sock_read_iter+0x5be/0x660 [ 162.466786][T11515] ? kernel_sock_ip_overhead+0x340/0x340 [ 162.472411][T11515] __vfs_read+0xa67/0xc90 [ 162.476735][T11515] vfs_read+0x359/0x6f0 [ 162.480877][T11515] ksys_read+0x265/0x430 [ 162.485122][T11515] __se_sys_read+0x92/0xb0 [ 162.489519][T11515] __x64_sys_read+0x4a/0x70 [ 162.494004][T11515] do_syscall_64+0xbc/0xf0 [ 162.498402][T11515] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 162.504468][T11515] RIP: 0033:0x47fd44 [ 162.508343][T11515] 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 [ 162.528556][T11515] RSP: 002b:000000c420399760 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 162.537125][T11515] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 162.545619][T11515] RDX: 0000000000001000 RSI: 000000c42013e000 RDI: 0000000000000003 [ 162.554565][T11515] RBP: 000000c4203997b0 R08: 0000000000000000 R09: 0000000000000000 [ 162.562725][T11515] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010 [ 162.570686][T11515] R13: 0000000000000010 R14: 0000000000000040 R15: ffffffffffffffff [ 162.580135][T11515] Kernel Offset: disabled [ 162.584494][T11515] Rebooting in 86400 seconds..