[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 76.325330][ T30] audit: type=1800 audit(1569733661.378:25): pid=11348 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 76.353514][ T30] audit: type=1800 audit(1569733661.408:26): pid=11348 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 76.388364][ T30] audit: type=1800 audit(1569733661.428:27): pid=11348 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 '10.128.0.76' (ECDSA) to the list of known hosts. 2019/09/29 05:07:56 fuzzer started 2019/09/29 05:08:00 dialing manager at 10.128.0.26:40453 2019/09/29 05:08:00 syscalls: 2385 2019/09/29 05:08:00 code coverage: enabled 2019/09/29 05:08:00 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/09/29 05:08:00 extra coverage: enabled 2019/09/29 05:08:00 setuid sandbox: enabled 2019/09/29 05:08:00 namespace sandbox: enabled 2019/09/29 05:08:00 Android sandbox: /sys/fs/selinux/policy does not exist 2019/09/29 05:08:00 fault injection: enabled 2019/09/29 05:08:00 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/09/29 05:08:00 net packet injection: enabled 2019/09/29 05:08:00 net device setup: enabled syzkaller login: [ 97.581021][T11502] ===================================================== [ 97.588037][T11502] BUG: KMSAN: uninit-value in kfree_skb+0x473/0x4c0 [ 97.594639][T11502] CPU: 0 PID: 11502 Comm: syz-fuzzer Not tainted 5.3.0-rc7+ #0 [ 97.602443][T11502] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 97.612584][T11502] Call Trace: [ 97.615914][T11502] dump_stack+0x191/0x1f0 [ 97.620234][T11502] kmsan_report+0x13a/0x2b0 [ 97.624743][T11502] __msan_warning+0x73/0xe0 [ 97.629232][T11502] kmem_cache_free+0x3df/0x2b70 [ 97.634083][T11502] ? kmsan_internal_set_origin+0x6a/0xb0 [ 97.639692][T11502] ? kfree_skb+0x473/0x4c0 [ 97.644088][T11502] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 97.650184][T11502] kfree_skb+0x473/0x4c0 [ 97.654434][T11502] ? packet_rcv_spkt+0x719/0x840 [ 97.659376][T11502] packet_rcv_spkt+0x719/0x840 [ 97.664152][T11502] ? packet_rcv+0x2190/0x2190 [ 97.668830][T11502] dev_queue_xmit_nit+0x1125/0x1200 [ 97.674051][T11502] dev_hard_start_xmit+0x21e/0xab0 [ 97.679186][T11502] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 97.685087][T11502] sch_direct_xmit+0x56c/0x18c0 [ 97.689947][T11502] ? ip_set_dump_start+0x1a29/0x29c0 [ 97.695225][T11502] __dev_queue_xmit+0x1e53/0x4270 [ 97.700242][T11502] dev_queue_xmit+0x4b/0x60 [ 97.704725][T11502] ip_finish_output2+0x20c6/0x25d0 [ 97.709812][T11502] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 97.715857][T11502] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 97.721841][T11502] __ip_finish_output+0xaf8/0xda0 [ 97.726851][T11502] ip_finish_output+0x2db/0x420 [ 97.731683][T11502] ip_output+0x541/0x610 [ 97.735909][T11502] ? ip_mc_finish_output+0x6d0/0x6d0 [ 97.741181][T11502] ? ip_finish_output+0x420/0x420 [ 97.746250][T11502] __ip_queue_xmit+0x1caf/0x21f0 [ 97.751273][T11502] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 97.757156][T11502] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 97.763324][T11502] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 97.769443][T11502] ip_queue_xmit+0xcc/0xf0 [ 97.773845][T11502] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 97.779458][T11502] __tcp_transmit_skb+0x409e/0x5c60 [ 97.784656][T11502] __tcp_send_ack+0x701/0x840 [ 97.789321][T11502] tcp_send_ack+0x68/0x90 [ 97.794170][T11502] tcp_cleanup_rbuf+0x764/0x800 [ 97.799011][T11502] tcp_recvmsg+0x334d/0x4ff0 [ 97.803606][T11502] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 97.809487][T11502] ? tcp_mmap+0x150/0x150 [ 97.813798][T11502] ? tcp_mmap+0x150/0x150 [ 97.818108][T11502] inet_recvmsg+0x237/0x7d0 [ 97.822603][T11502] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 97.828471][T11502] ? inet_sendpage+0x2c0/0x2c0 [ 97.833212][T11502] ? inet_sendpage+0x2c0/0x2c0 [ 97.837952][T11502] sock_read_iter+0x5be/0x660 [ 97.842614][T11502] ? kernel_sock_ip_overhead+0x340/0x340 [ 97.848233][T11502] __vfs_read+0xa67/0xc90 [ 97.852588][T11502] vfs_read+0x359/0x6f0 [ 97.856728][T11502] ksys_read+0x265/0x430 [ 97.860953][T11502] __se_sys_read+0x92/0xb0 [ 97.865350][T11502] __x64_sys_read+0x4a/0x70 [ 97.869830][T11502] do_syscall_64+0xbc/0xf0 [ 97.874237][T11502] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 97.880117][T11502] RIP: 0033:0x47fd44 [ 97.883989][T11502] 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 [ 97.903570][T11502] RSP: 002b:000000c420065710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 97.911959][T11502] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 97.919907][T11502] RDX: 0000000000001000 RSI: 000000c4203ce000 RDI: 0000000000000003 [ 97.927854][T11502] RBP: 000000c420065760 R08: 0000000000000000 R09: 0000000000000000 [ 97.935811][T11502] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 97.943772][T11502] R13: 0000000000000004 R14: 0000000000000002 R15: ffffffffffffffff [ 97.951726][T11502] [ 97.954040][T11502] Uninit was stored to memory at: [ 97.959046][T11502] kmsan_internal_chain_origin+0xd2/0x170 [ 97.964738][T11502] __msan_chain_origin+0x6b/0xe0 [ 97.969652][T11502] ___slab_alloc+0x1dbc/0x1fb0 [ 97.974399][T11502] kmem_cache_alloc+0xade/0xd10 [ 97.979224][T11502] skb_clone+0x326/0x5d0 [ 97.983444][T11502] dev_queue_xmit_nit+0x539/0x1200 [ 97.988548][T11502] dev_hard_start_xmit+0x21e/0xab0 [ 97.993722][T11502] sch_direct_xmit+0x56c/0x18c0 [ 97.998740][T11502] __dev_queue_xmit+0x1e53/0x4270 [ 98.003738][T11502] dev_queue_xmit+0x4b/0x60 [ 98.008225][T11502] ip_finish_output2+0x20c6/0x25d0 [ 98.013327][T11502] __ip_finish_output+0xaf8/0xda0 [ 98.018327][T11502] ip_finish_output+0x2db/0x420 [ 98.023167][T11502] ip_output+0x541/0x610 [ 98.027392][T11502] __ip_queue_xmit+0x1caf/0x21f0 [ 98.032307][T11502] ip_queue_xmit+0xcc/0xf0 [ 98.036702][T11502] __tcp_transmit_skb+0x409e/0x5c60 [ 98.041892][T11502] __tcp_send_ack+0x701/0x840 [ 98.046562][T11502] tcp_send_ack+0x68/0x90 [ 98.050870][T11502] tcp_cleanup_rbuf+0x764/0x800 [ 98.055710][T11502] tcp_recvmsg+0x334d/0x4ff0 [ 98.060287][T11502] inet_recvmsg+0x237/0x7d0 [ 98.064769][T11502] sock_read_iter+0x5be/0x660 [ 98.069435][T11502] __vfs_read+0xa67/0xc90 [ 98.073749][T11502] vfs_read+0x359/0x6f0 [ 98.077879][T11502] ksys_read+0x265/0x430 [ 98.082900][T11502] __se_sys_read+0x92/0xb0 [ 98.087302][T11502] __x64_sys_read+0x4a/0x70 [ 98.091782][T11502] do_syscall_64+0xbc/0xf0 [ 98.096177][T11502] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 98.102049][T11502] [ 98.104362][T11502] Uninit was created at: [ 98.108580][T11502] kmsan_internal_poison_shadow+0x53/0x100 [ 98.114367][T11502] kmsan_slab_free+0x8d/0x100 [ 98.119032][T11502] kmem_cache_free_bulk+0x3ad9/0x3f50 [ 98.124380][T11502] __kfree_skb_flush+0xb0/0x100 [ 98.129207][T11502] net_rx_action+0x1908/0x1950 [ 98.133948][T11502] __do_softirq+0x4a1/0x83a [ 98.138427][T11502] irq_exit+0x230/0x280 [ 98.142556][T11502] do_IRQ+0x20d/0x3a0 [ 98.146515][T11502] ret_from_intr+0x0/0x33 [ 98.150816][T11502] ===================================================== [ 98.157727][T11502] Disabling lock debugging due to kernel taint [ 98.163852][T11502] Kernel panic - not syncing: panic_on_warn set ... [ 98.170418][T11502] CPU: 0 PID: 11502 Comm: syz-fuzzer Tainted: G B 5.3.0-rc7+ #0 [ 98.179418][T11502] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 98.189458][T11502] Call Trace: [ 98.192732][T11502] dump_stack+0x191/0x1f0 [ 98.197043][T11502] panic+0x3c9/0xc1e [ 98.200930][T11502] kmsan_report+0x2a2/0x2b0 [ 98.205412][T11502] __msan_warning+0x73/0xe0 [ 98.209898][T11502] kmem_cache_free+0x3df/0x2b70 [ 98.214730][T11502] ? kmsan_internal_set_origin+0x6a/0xb0 [ 98.220340][T11502] ? kfree_skb+0x473/0x4c0 [ 98.224734][T11502] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 98.230787][T11502] kfree_skb+0x473/0x4c0 [ 98.235022][T11502] ? packet_rcv_spkt+0x719/0x840 [ 98.239944][T11502] packet_rcv_spkt+0x719/0x840 [ 98.244693][T11502] ? packet_rcv+0x2190/0x2190 [ 98.249349][T11502] dev_queue_xmit_nit+0x1125/0x1200 [ 98.254555][T11502] dev_hard_start_xmit+0x21e/0xab0 [ 98.259654][T11502] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 98.265529][T11502] sch_direct_xmit+0x56c/0x18c0 [ 98.270362][T11502] ? ip_set_dump_start+0x1a29/0x29c0 [ 98.275642][T11502] __dev_queue_xmit+0x1e53/0x4270 [ 98.280672][T11502] dev_queue_xmit+0x4b/0x60 [ 98.285184][T11502] ip_finish_output2+0x20c6/0x25d0 [ 98.290281][T11502] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 98.296355][T11502] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 98.302334][T11502] __ip_finish_output+0xaf8/0xda0 [ 98.307355][T11502] ip_finish_output+0x2db/0x420 [ 98.312188][T11502] ip_output+0x541/0x610 [ 98.316420][T11502] ? ip_mc_finish_output+0x6d0/0x6d0 [ 98.321683][T11502] ? ip_finish_output+0x420/0x420 [ 98.326684][T11502] __ip_queue_xmit+0x1caf/0x21f0 [ 98.331612][T11502] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 98.337486][T11502] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 98.343545][T11502] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 98.349609][T11502] ip_queue_xmit+0xcc/0xf0 [ 98.354006][T11502] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 98.359616][T11502] __tcp_transmit_skb+0x409e/0x5c60 [ 98.364824][T11502] __tcp_send_ack+0x701/0x840 [ 98.369484][T11502] tcp_send_ack+0x68/0x90 [ 98.373794][T11502] tcp_cleanup_rbuf+0x764/0x800 [ 98.378626][T11502] tcp_recvmsg+0x334d/0x4ff0 [ 98.383224][T11502] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 98.389107][T11502] ? tcp_mmap+0x150/0x150 [ 98.393585][T11502] ? tcp_mmap+0x150/0x150 [ 98.397892][T11502] inet_recvmsg+0x237/0x7d0 [ 98.402379][T11502] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 98.408247][T11502] ? inet_sendpage+0x2c0/0x2c0 [ 98.413002][T11502] ? inet_sendpage+0x2c0/0x2c0 [ 98.417745][T11502] sock_read_iter+0x5be/0x660 [ 98.422407][T11502] ? kernel_sock_ip_overhead+0x340/0x340 [ 98.428031][T11502] __vfs_read+0xa67/0xc90 [ 98.432368][T11502] vfs_read+0x359/0x6f0 [ 98.436520][T11502] ksys_read+0x265/0x430 [ 98.440745][T11502] __se_sys_read+0x92/0xb0 [ 98.445141][T11502] __x64_sys_read+0x4a/0x70 [ 98.449623][T11502] do_syscall_64+0xbc/0xf0 [ 98.454019][T11502] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 98.459884][T11502] RIP: 0033:0x47fd44 [ 98.463768][T11502] 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 [ 98.483353][T11502] RSP: 002b:000000c420065710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 98.491739][T11502] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 98.499699][T11502] RDX: 0000000000001000 RSI: 000000c4203ce000 RDI: 0000000000000003 [ 98.507659][T11502] RBP: 000000c420065760 R08: 0000000000000000 R09: 0000000000000000 [ 98.515608][T11502] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 98.523558][T11502] R13: 0000000000000004 R14: 0000000000000002 R15: ffffffffffffffff [ 98.532969][T11502] Kernel Offset: disabled [ 98.537313][T11502] Rebooting in 86400 seconds..