[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 74.632896][ T30] audit: type=1800 audit(1569796816.678:25): pid=11151 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 74.652761][ T30] audit: type=1800 audit(1569796816.688:26): pid=11151 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 74.681456][ T30] audit: type=1800 audit(1569796816.728:27): pid=11151 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 '10.128.10.50' (ECDSA) to the list of known hosts. 2019/09/29 22:40:31 fuzzer started 2019/09/29 22:40:35 dialing manager at 10.128.0.26:42601 2019/09/29 22:40:36 syscalls: 2385 2019/09/29 22:40:36 code coverage: enabled 2019/09/29 22:40:36 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/09/29 22:40:36 extra coverage: enabled 2019/09/29 22:40:36 setuid sandbox: enabled 2019/09/29 22:40:36 namespace sandbox: enabled 2019/09/29 22:40:36 Android sandbox: /sys/fs/selinux/policy does not exist 2019/09/29 22:40:36 fault injection: enabled 2019/09/29 22:40:36 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/09/29 22:40:36 net packet injection: enabled 2019/09/29 22:40:36 net device setup: enabled syzkaller login: [ 97.268577][T11305] ===================================================== [ 97.275569][T11305] BUG: KMSAN: uninit-value in kfree_skb+0x473/0x4c0 [ 97.282160][T11305] CPU: 1 PID: 11305 Comm: syz-fuzzer Not tainted 5.3.0-rc7+ #0 [ 97.289693][T11305] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 97.299863][T11305] Call Trace: [ 97.303164][T11305] dump_stack+0x191/0x1f0 [ 97.307505][T11305] kmsan_report+0x13a/0x2b0 [ 97.312035][T11305] __msan_warning+0x73/0xe0 [ 97.316596][T11305] kmem_cache_free+0x3df/0x2b70 [ 97.321694][T11305] ? kmsan_internal_set_origin+0x6a/0xb0 [ 97.327301][T11305] ? kfree_skb+0x473/0x4c0 [ 97.331695][T11305] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 97.337746][T11305] kfree_skb+0x473/0x4c0 [ 97.341979][T11305] ? packet_rcv_spkt+0x719/0x840 [ 97.346905][T11305] packet_rcv_spkt+0x719/0x840 [ 97.351653][T11305] ? packet_rcv+0x2190/0x2190 [ 97.356305][T11305] dev_queue_xmit_nit+0x1125/0x1200 [ 97.361490][T11305] dev_hard_start_xmit+0x21e/0xab0 [ 97.366585][T11305] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 97.372721][T11305] sch_direct_xmit+0x56c/0x18c0 [ 97.378511][T11305] __dev_queue_xmit+0x1e53/0x4270 [ 97.383529][T11305] dev_queue_xmit+0x4b/0x60 [ 97.388012][T11305] ip_finish_output2+0x20c6/0x25d0 [ 97.393099][T11305] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 97.399145][T11305] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 97.405117][T11305] __ip_finish_output+0xaf8/0xda0 [ 97.410166][T11305] ip_finish_output+0x2db/0x420 [ 97.415007][T11305] ip_output+0x541/0x610 [ 97.419234][T11305] ? ip_mc_finish_output+0x6d0/0x6d0 [ 97.424505][T11305] ? ip_finish_output+0x420/0x420 [ 97.429508][T11305] __ip_queue_xmit+0x1caf/0x21f0 [ 97.434442][T11305] ip_queue_xmit+0xcc/0xf0 [ 97.438837][T11305] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 97.444448][T11305] __tcp_transmit_skb+0x409e/0x5c60 [ 97.449662][T11305] __tcp_send_ack+0x701/0x840 [ 97.454328][T11305] tcp_send_ack+0x68/0x90 [ 97.458638][T11305] tcp_cleanup_rbuf+0x764/0x800 [ 97.463497][T11305] tcp_recvmsg+0x334d/0x4ff0 [ 97.468119][T11305] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 97.474014][T11305] ? tcp_mmap+0x150/0x150 [ 97.478331][T11305] ? tcp_mmap+0x150/0x150 [ 97.482648][T11305] inet_recvmsg+0x237/0x7d0 [ 97.487138][T11305] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 97.493009][T11305] ? inet_sendpage+0x2c0/0x2c0 [ 97.497751][T11305] ? inet_sendpage+0x2c0/0x2c0 [ 97.502514][T11305] sock_read_iter+0x5be/0x660 [ 97.507179][T11305] ? kernel_sock_ip_overhead+0x340/0x340 [ 97.512789][T11305] __vfs_read+0xa67/0xc90 [ 97.517109][T11305] vfs_read+0x359/0x6f0 [ 97.521248][T11305] ksys_read+0x265/0x430 [ 97.525476][T11305] __se_sys_read+0x92/0xb0 [ 97.529873][T11305] __x64_sys_read+0x4a/0x70 [ 97.534356][T11305] do_syscall_64+0xbc/0xf0 [ 97.538751][T11305] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 97.544644][T11305] RIP: 0033:0x47fd44 [ 97.548536][T11305] 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 [ 97.568118][T11305] RSP: 002b:000000c420199710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 97.576505][T11305] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 97.584457][T11305] RDX: 0000000000001000 RSI: 000000c4203a6000 RDI: 0000000000000003 [ 97.592407][T11305] RBP: 000000c420199760 R08: 0000000000000000 R09: 0000000000000000 [ 97.600355][T11305] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000020 [ 97.608325][T11305] R13: 0000000000000020 R14: 0000000000000020 R15: ffffffffffffffff [ 97.616297][T11305] [ 97.618607][T11305] Uninit was stored to memory at: [ 97.623612][T11305] kmsan_internal_chain_origin+0xd2/0x170 [ 97.629310][T11305] __msan_chain_origin+0x6b/0xe0 [ 97.634224][T11305] ___slab_alloc+0x1dbc/0x1fb0 [ 97.638985][T11305] kmem_cache_alloc+0xade/0xd10 [ 97.643814][T11305] skb_clone+0x326/0x5d0 [ 97.648030][T11305] dev_queue_xmit_nit+0x539/0x1200 [ 97.653114][T11305] dev_hard_start_xmit+0x21e/0xab0 [ 97.658203][T11305] sch_direct_xmit+0x56c/0x18c0 [ 97.663086][T11305] __dev_queue_xmit+0x1e53/0x4270 [ 97.668089][T11305] dev_queue_xmit+0x4b/0x60 [ 97.672694][T11305] ip_finish_output2+0x20c6/0x25d0 [ 97.677792][T11305] __ip_finish_output+0xaf8/0xda0 [ 97.682804][T11305] ip_finish_output+0x2db/0x420 [ 97.687637][T11305] ip_output+0x541/0x610 [ 97.691861][T11305] __ip_queue_xmit+0x1caf/0x21f0 [ 97.696783][T11305] ip_queue_xmit+0xcc/0xf0 [ 97.701180][T11305] __tcp_transmit_skb+0x409e/0x5c60 [ 97.706358][T11305] __tcp_send_ack+0x701/0x840 [ 97.711014][T11305] tcp_send_ack+0x68/0x90 [ 97.715322][T11305] tcp_cleanup_rbuf+0x764/0x800 [ 97.720150][T11305] tcp_recvmsg+0x334d/0x4ff0 [ 97.724811][T11305] inet_recvmsg+0x237/0x7d0 [ 97.729291][T11305] sock_read_iter+0x5be/0x660 [ 97.733946][T11305] __vfs_read+0xa67/0xc90 [ 97.738250][T11305] vfs_read+0x359/0x6f0 [ 97.742398][T11305] ksys_read+0x265/0x430 [ 97.746620][T11305] __se_sys_read+0x92/0xb0 [ 97.751010][T11305] __x64_sys_read+0x4a/0x70 [ 97.755490][T11305] do_syscall_64+0xbc/0xf0 [ 97.760074][T11305] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 97.765945][T11305] [ 97.768300][T11305] Uninit was created at: [ 97.772539][T11305] kmsan_internal_poison_shadow+0x53/0x100 [ 97.778324][T11305] kmsan_slab_free+0x8d/0x100 [ 97.782982][T11305] kmem_cache_free_bulk+0x3ad9/0x3f50 [ 97.788347][T11305] __kfree_skb_flush+0xb0/0x100 [ 97.793201][T11305] net_rx_action+0x1908/0x1950 [ 97.797945][T11305] __do_softirq+0x4a1/0x83a [ 97.802428][T11305] do_softirq_own_stack+0x49/0x80 [ 97.807436][T11305] __local_bh_enable_ip+0x184/0x1d0 [ 97.812617][T11305] local_bh_enable+0x36/0x40 [ 97.817199][T11305] lock_sock_nested+0x22f/0x290 [ 97.822039][T11305] tcp_recvmsg+0x35f/0x4ff0 [ 97.826529][T11305] inet_recvmsg+0x237/0x7d0 [ 97.831015][T11305] sock_read_iter+0x5be/0x660 [ 97.835674][T11305] __vfs_read+0xa67/0xc90 [ 97.839993][T11305] vfs_read+0x359/0x6f0 [ 97.844127][T11305] ksys_read+0x265/0x430 [ 97.848359][T11305] __se_sys_read+0x92/0xb0 [ 97.852753][T11305] __x64_sys_read+0x4a/0x70 [ 97.857242][T11305] do_syscall_64+0xbc/0xf0 [ 97.861638][T11305] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 97.867502][T11305] ===================================================== [ 97.874407][T11305] Disabling lock debugging due to kernel taint [ 97.880555][T11305] Kernel panic - not syncing: panic_on_warn set ... [ 97.887139][T11305] CPU: 1 PID: 11305 Comm: syz-fuzzer Tainted: G B 5.3.0-rc7+ #0 [ 97.896041][T11305] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 97.906071][T11305] Call Trace: [ 97.909370][T11305] dump_stack+0x191/0x1f0 [ 97.913705][T11305] panic+0x3c9/0xc1e [ 97.917596][T11305] kmsan_report+0x2a2/0x2b0 [ 97.922083][T11305] __msan_warning+0x73/0xe0 [ 97.926583][T11305] kmem_cache_free+0x3df/0x2b70 [ 97.931422][T11305] ? kmsan_internal_set_origin+0x6a/0xb0 [ 97.937034][T11305] ? kfree_skb+0x473/0x4c0 [ 97.941534][T11305] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 97.947606][T11305] kfree_skb+0x473/0x4c0 [ 97.951889][T11305] ? packet_rcv_spkt+0x719/0x840 [ 97.957873][T11305] packet_rcv_spkt+0x719/0x840 [ 97.962636][T11305] ? packet_rcv+0x2190/0x2190 [ 97.967345][T11305] dev_queue_xmit_nit+0x1125/0x1200 [ 97.972635][T11305] dev_hard_start_xmit+0x21e/0xab0 [ 97.977748][T11305] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 97.983643][T11305] sch_direct_xmit+0x56c/0x18c0 [ 97.988506][T11305] __dev_queue_xmit+0x1e53/0x4270 [ 97.993622][T11305] dev_queue_xmit+0x4b/0x60 [ 97.998136][T11305] ip_finish_output2+0x20c6/0x25d0 [ 98.003238][T11305] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 98.009293][T11305] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 98.015287][T11305] __ip_finish_output+0xaf8/0xda0 [ 98.020302][T11305] ip_finish_output+0x2db/0x420 [ 98.025155][T11305] ip_output+0x541/0x610 [ 98.029383][T11305] ? ip_mc_finish_output+0x6d0/0x6d0 [ 98.034651][T11305] ? ip_finish_output+0x420/0x420 [ 98.039654][T11305] __ip_queue_xmit+0x1caf/0x21f0 [ 98.044590][T11305] ip_queue_xmit+0xcc/0xf0 [ 98.048990][T11305] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 98.054603][T11305] __tcp_transmit_skb+0x409e/0x5c60 [ 98.059798][T11305] __tcp_send_ack+0x701/0x840 [ 98.064458][T11305] tcp_send_ack+0x68/0x90 [ 98.068766][T11305] tcp_cleanup_rbuf+0x764/0x800 [ 98.073683][T11305] tcp_recvmsg+0x334d/0x4ff0 [ 98.078290][T11305] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 98.084161][T11305] ? tcp_mmap+0x150/0x150 [ 98.088467][T11305] ? tcp_mmap+0x150/0x150 [ 98.092773][T11305] inet_recvmsg+0x237/0x7d0 [ 98.097269][T11305] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 98.103147][T11305] ? inet_sendpage+0x2c0/0x2c0 [ 98.107899][T11305] ? inet_sendpage+0x2c0/0x2c0 [ 98.112651][T11305] sock_read_iter+0x5be/0x660 [ 98.117322][T11305] ? kernel_sock_ip_overhead+0x340/0x340 [ 98.122940][T11305] __vfs_read+0xa67/0xc90 [ 98.127260][T11305] vfs_read+0x359/0x6f0 [ 98.131416][T11305] ksys_read+0x265/0x430 [ 98.135643][T11305] __se_sys_read+0x92/0xb0 [ 98.140039][T11305] __x64_sys_read+0x4a/0x70 [ 98.144523][T11305] do_syscall_64+0xbc/0xf0 [ 98.148942][T11305] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 98.154811][T11305] RIP: 0033:0x47fd44 [ 98.158684][T11305] 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 [ 98.178266][T11305] RSP: 002b:000000c420199710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 98.186658][T11305] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 98.194623][T11305] RDX: 0000000000001000 RSI: 000000c4203a6000 RDI: 0000000000000003 [ 98.202591][T11305] RBP: 000000c420199760 R08: 0000000000000000 R09: 0000000000000000 [ 98.210540][T11305] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000020 [ 98.218503][T11305] R13: 0000000000000020 R14: 0000000000000020 R15: ffffffffffffffff [ 98.228688][T11305] Kernel Offset: disabled [ 98.233013][T11305] Rebooting in 86400 seconds..