[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 85.626895][ T30] audit: type=1800 audit(1570415011.681:25): pid=12248 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 85.650555][ T30] audit: type=1800 audit(1570415011.711:26): pid=12248 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 85.702870][ T30] audit: type=1800 audit(1570415011.731:27): pid=12248 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 '10.128.0.213' (ECDSA) to the list of known hosts. 2019/10/07 02:23:48 fuzzer started 2019/10/07 02:23:52 dialing manager at 10.128.0.26:41347 2019/10/07 02:23:52 syscalls: 2412 2019/10/07 02:23:52 code coverage: enabled 2019/10/07 02:23:52 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/10/07 02:23:52 extra coverage: enabled 2019/10/07 02:23:52 setuid sandbox: enabled 2019/10/07 02:23:52 namespace sandbox: enabled 2019/10/07 02:23:52 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/07 02:23:52 fault injection: enabled 2019/10/07 02:23:52 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/07 02:23:52 net packet injection: enabled 2019/10/07 02:23:52 net device setup: enabled 2019/10/07 02:23:52 concurrency sanitizer: /proc/kcsaninfo does not exist syzkaller login: [ 187.335038][T12401] ===================================================== [ 187.342069][T12401] BUG: KMSAN: uninit-value in kfree_skb+0x473/0x4c0 [ 187.350411][T12401] CPU: 0 PID: 12401 Comm: syz-fuzzer Not tainted 5.3.0-rc7+ #0 [ 187.357965][T12401] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 187.368046][T12401] Call Trace: [ 187.371357][T12401] dump_stack+0x191/0x1f0 [ 187.375722][T12401] kmsan_report+0x13a/0x2b0 [ 187.380270][T12401] __msan_warning+0x73/0xe0 [ 187.384798][T12401] kmem_cache_free+0x3df/0x2b70 [ 187.389656][T12401] ? kmsan_internal_set_origin+0x6a/0xb0 [ 187.395570][T12401] ? kfree_skb+0x473/0x4c0 [ 187.400180][T12401] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 187.406289][T12401] kfree_skb+0x473/0x4c0 [ 187.410559][T12401] ? packet_rcv_spkt+0x719/0x840 [ 187.415534][T12401] packet_rcv_spkt+0x719/0x840 [ 187.420313][T12401] ? packet_rcv+0x2190/0x2190 [ 187.425138][T12401] dev_queue_xmit_nit+0x1125/0x1200 [ 187.430383][T12401] dev_hard_start_xmit+0x21e/0xab0 [ 187.435620][T12401] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 187.441531][T12401] sch_direct_xmit+0x56c/0x18c0 [ 187.446393][T12401] __dev_queue_xmit+0x1e53/0x4270 [ 187.451452][T12401] dev_queue_xmit+0x4b/0x60 [ 187.455975][T12401] ip_finish_output2+0x20c6/0x25d0 [ 187.461134][T12401] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 187.467285][T12401] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 187.473294][T12401] __ip_finish_output+0xaf8/0xda0 [ 187.478439][T12401] ip_finish_output+0x2db/0x420 [ 187.483305][T12401] ip_output+0x541/0x610 [ 187.487555][T12401] ? ip_mc_finish_output+0x6d0/0x6d0 [ 187.492833][T12401] ? ip_finish_output+0x420/0x420 [ 187.497850][T12401] __ip_queue_xmit+0x1caf/0x21f0 [ 187.503233][T12401] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 187.509107][T12401] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 187.515168][T12401] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 187.521241][T12401] ip_queue_xmit+0xcc/0xf0 [ 187.525839][T12401] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 187.531804][T12401] __tcp_transmit_skb+0x409e/0x5c60 [ 187.537298][T12401] __tcp_send_ack+0x701/0x840 [ 187.541969][T12401] tcp_send_ack+0x68/0x90 [ 187.546313][T12401] tcp_cleanup_rbuf+0x764/0x800 [ 187.551156][T12401] tcp_recvmsg+0x334d/0x4ff0 [ 187.555765][T12401] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 187.561656][T12401] ? tcp_mmap+0x150/0x150 [ 187.565984][T12401] ? tcp_mmap+0x150/0x150 [ 187.570296][T12401] inet_recvmsg+0x237/0x7d0 [ 187.574801][T12401] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 187.580689][T12401] ? inet_sendpage+0x2c0/0x2c0 [ 187.585439][T12401] ? inet_sendpage+0x2c0/0x2c0 [ 187.590208][T12401] sock_read_iter+0x5be/0x660 [ 187.595222][T12401] ? kernel_sock_ip_overhead+0x340/0x340 [ 187.600836][T12401] __vfs_read+0xa67/0xc90 [ 187.605193][T12401] vfs_read+0x359/0x6f0 [ 187.609360][T12401] ksys_read+0x265/0x430 [ 187.613623][T12401] __se_sys_read+0x92/0xb0 [ 187.618027][T12401] __x64_sys_read+0x4a/0x70 [ 187.622529][T12401] do_syscall_64+0xbc/0xf0 [ 187.626929][T12401] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 187.634019][T12401] RIP: 0033:0x47fd44 [ 187.637895][T12401] 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 [ 187.657639][T12401] RSP: 002b:000000c42038f710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 187.666382][T12401] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 187.674555][T12401] RDX: 0000000000001000 RSI: 000000c420356000 RDI: 0000000000000003 [ 187.682515][T12401] RBP: 000000c42038f760 R08: 0000000000000000 R09: 0000000000000000 [ 187.690469][T12401] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 187.698541][T12401] R13: 0000000000000004 R14: 0000000000000004 R15: ffffffffffffffff [ 187.706512][T12401] [ 187.708822][T12401] Uninit was stored to memory at: [ 187.713857][T12401] kmsan_internal_chain_origin+0xd2/0x170 [ 187.719573][T12401] __msan_chain_origin+0x6b/0xe0 [ 187.724580][T12401] ___slab_alloc+0x1dbc/0x1fb0 [ 187.729414][T12401] kmem_cache_alloc+0xade/0xd10 [ 187.734242][T12401] skb_clone+0x326/0x5d0 [ 187.738481][T12401] dev_queue_xmit_nit+0x539/0x1200 [ 187.743665][T12401] dev_hard_start_xmit+0x21e/0xab0 [ 187.748779][T12401] sch_direct_xmit+0x56c/0x18c0 [ 187.753630][T12401] __dev_queue_xmit+0x1e53/0x4270 [ 187.758644][T12401] dev_queue_xmit+0x4b/0x60 [ 187.763139][T12401] ip_finish_output2+0x20c6/0x25d0 [ 187.768313][T12401] __ip_finish_output+0xaf8/0xda0 [ 187.773415][T12401] ip_finish_output+0x2db/0x420 [ 187.778244][T12401] ip_output+0x541/0x610 [ 187.782474][T12401] __ip_queue_xmit+0x1caf/0x21f0 [ 187.787563][T12401] ip_queue_xmit+0xcc/0xf0 [ 187.791963][T12401] __tcp_transmit_skb+0x409e/0x5c60 [ 187.797151][T12401] __tcp_send_ack+0x701/0x840 [ 187.801817][T12401] tcp_send_ack+0x68/0x90 [ 187.806145][T12401] tcp_cleanup_rbuf+0x764/0x800 [ 187.810976][T12401] tcp_recvmsg+0x334d/0x4ff0 [ 187.815566][T12401] inet_recvmsg+0x237/0x7d0 [ 187.820172][T12401] sock_read_iter+0x5be/0x660 [ 187.824828][T12401] __vfs_read+0xa67/0xc90 [ 187.829136][T12401] vfs_read+0x359/0x6f0 [ 187.833281][T12401] ksys_read+0x265/0x430 [ 187.837503][T12401] __se_sys_read+0x92/0xb0 [ 187.841946][T12401] __x64_sys_read+0x4a/0x70 [ 187.846456][T12401] do_syscall_64+0xbc/0xf0 [ 187.850867][T12401] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 187.856749][T12401] [ 187.859056][T12401] Uninit was created at: [ 187.863449][T12401] kmsan_internal_poison_shadow+0x53/0x100 [ 187.869265][T12401] kmsan_slab_free+0x8d/0x100 [ 187.873977][T12401] kmem_cache_free_bulk+0x3ad9/0x3f50 [ 187.879365][T12401] __kfree_skb_flush+0xb0/0x100 [ 187.884204][T12401] net_rx_action+0x1908/0x1950 [ 187.888969][T12401] __do_softirq+0x4a1/0x83a [ 187.893547][T12401] irq_exit+0x230/0x280 [ 187.897737][T12401] do_IRQ+0x20d/0x3a0 [ 187.901859][T12401] ret_from_intr+0x0/0x33 [ 187.906177][T12401] default_idle+0x53/0x90 [ 187.910495][T12401] arch_cpu_idle+0x25/0x30 [ 187.914949][T12401] do_idle+0x1d7/0x790 [ 187.919010][T12401] cpu_startup_entry+0x45/0x50 [ 187.923879][T12401] rest_init+0x1be/0x1f0 [ 187.929935][T12401] arch_call_rest_init+0x13/0x15 [ 187.934868][T12401] start_kernel+0x991/0xb61 [ 187.939352][T12401] x86_64_start_reservations+0x18/0x2e [ 187.944822][T12401] x86_64_start_kernel+0x81/0x84 [ 187.949768][T12401] secondary_startup_64+0xa4/0xb0 [ 187.954771][T12401] ===================================================== [ 187.961696][T12401] Disabling lock debugging due to kernel taint [ 187.967838][T12401] Kernel panic - not syncing: panic_on_warn set ... [ 187.974512][T12401] CPU: 0 PID: 12401 Comm: syz-fuzzer Tainted: G B 5.3.0-rc7+ #0 [ 187.983804][T12401] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 187.993884][T12401] Call Trace: [ 187.997350][T12401] dump_stack+0x191/0x1f0 [ 188.001723][T12401] panic+0x3c9/0xc1e [ 188.005658][T12401] kmsan_report+0x2a2/0x2b0 [ 188.010161][T12401] __msan_warning+0x73/0xe0 [ 188.014679][T12401] kmem_cache_free+0x3df/0x2b70 [ 188.019534][T12401] ? kmsan_internal_set_origin+0x6a/0xb0 [ 188.025152][T12401] ? kfree_skb+0x473/0x4c0 [ 188.029804][T12401] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 188.036042][T12401] kfree_skb+0x473/0x4c0 [ 188.040309][T12401] ? packet_rcv_spkt+0x719/0x840 [ 188.045247][T12401] packet_rcv_spkt+0x719/0x840 [ 188.050029][T12401] ? packet_rcv+0x2190/0x2190 [ 188.054698][T12401] dev_queue_xmit_nit+0x1125/0x1200 [ 188.060076][T12401] dev_hard_start_xmit+0x21e/0xab0 [ 188.065206][T12401] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 188.071239][T12401] sch_direct_xmit+0x56c/0x18c0 [ 188.076109][T12401] __dev_queue_xmit+0x1e53/0x4270 [ 188.081160][T12401] dev_queue_xmit+0x4b/0x60 [ 188.085675][T12401] ip_finish_output2+0x20c6/0x25d0 [ 188.090767][T12401] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 188.096915][T12401] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 188.102895][T12401] __ip_finish_output+0xaf8/0xda0 [ 188.107996][T12401] ip_finish_output+0x2db/0x420 [ 188.112841][T12401] ip_output+0x541/0x610 [ 188.117071][T12401] ? ip_mc_finish_output+0x6d0/0x6d0 [ 188.122337][T12401] ? ip_finish_output+0x420/0x420 [ 188.127353][T12401] __ip_queue_xmit+0x1caf/0x21f0 [ 188.132273][T12401] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 188.138236][T12401] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 188.144304][T12401] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 188.150364][T12401] ip_queue_xmit+0xcc/0xf0 [ 188.154792][T12401] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 188.160420][T12401] __tcp_transmit_skb+0x409e/0x5c60 [ 188.165634][T12401] __tcp_send_ack+0x701/0x840 [ 188.170454][T12401] tcp_send_ack+0x68/0x90 [ 188.174873][T12401] tcp_cleanup_rbuf+0x764/0x800 [ 188.179713][T12401] tcp_recvmsg+0x334d/0x4ff0 [ 188.184325][T12401] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 188.190353][T12401] ? tcp_mmap+0x150/0x150 [ 188.194676][T12401] ? tcp_mmap+0x150/0x150 [ 188.199195][T12401] inet_recvmsg+0x237/0x7d0 [ 188.203729][T12401] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 188.209627][T12401] ? inet_sendpage+0x2c0/0x2c0 [ 188.214389][T12401] ? inet_sendpage+0x2c0/0x2c0 [ 188.219301][T12401] sock_read_iter+0x5be/0x660 [ 188.224433][T12401] ? kernel_sock_ip_overhead+0x340/0x340 [ 188.230166][T12401] __vfs_read+0xa67/0xc90 [ 188.234519][T12401] vfs_read+0x359/0x6f0 [ 188.238697][T12401] ksys_read+0x265/0x430 [ 188.242945][T12401] __se_sys_read+0x92/0xb0 [ 188.247381][T12401] __x64_sys_read+0x4a/0x70 [ 188.251878][T12401] do_syscall_64+0xbc/0xf0 [ 188.256344][T12401] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 188.262254][T12401] RIP: 0033:0x47fd44 [ 188.266155][T12401] 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 [ 188.285752][T12401] RSP: 002b:000000c42038f710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 188.294156][T12401] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 188.302116][T12401] RDX: 0000000000001000 RSI: 000000c420356000 RDI: 0000000000000003 [ 188.310094][T12401] RBP: 000000c42038f760 R08: 0000000000000000 R09: 0000000000000000 [ 188.318433][T12401] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 188.326438][T12401] R13: 0000000000000004 R14: 0000000000000004 R15: ffffffffffffffff [ 188.336004][T12401] Kernel Offset: disabled [ 188.340357][T12401] Rebooting in 86400 seconds..