[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 103.808654][ T31] audit: type=1800 audit(1565919768.862:25): pid=11857 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 103.842290][ T31] audit: type=1800 audit(1565919768.892:26): pid=11857 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 103.862549][ T31] audit: type=1800 audit(1565919768.902:27): pid=11857 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 '10.128.0.10' (ECDSA) to the list of known hosts. 2019/08/16 01:43:03 fuzzer started 2019/08/16 01:43:09 dialing manager at 10.128.0.26:38533 2019/08/16 01:43:10 syscalls: 2376 2019/08/16 01:43:10 code coverage: enabled 2019/08/16 01:43:10 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/08/16 01:43:10 extra coverage: enabled 2019/08/16 01:43:10 setuid sandbox: enabled 2019/08/16 01:43:10 namespace sandbox: enabled 2019/08/16 01:43:10 Android sandbox: /sys/fs/selinux/policy does not exist 2019/08/16 01:43:10 fault injection: enabled 2019/08/16 01:43:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/08/16 01:43:10 net packet injection: enabled 2019/08/16 01:43:10 net device setup: enabled syzkaller login: [ 189.018919][T12008] ================================================================== [ 189.027061][T12008] BUG: KMSAN: uninit-value in kmem_cache_free+0x3df/0x2b70 [ 189.034795][T12008] CPU: 0 PID: 12008 Comm: syz-fuzzer Not tainted 5.3.0-rc3+ #17 [ 189.042430][T12008] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 189.052499][T12008] Call Trace: [ 189.055818][T12008] dump_stack+0x191/0x1f0 [ 189.060184][T12008] kmsan_report+0x162/0x2d0 [ 189.064720][T12008] __msan_warning+0x75/0xe0 [ 189.069261][T12008] kmem_cache_free+0x3df/0x2b70 [ 189.074124][T12008] ? kfree_skb+0x473/0x4c0 [ 189.078545][T12008] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 189.084949][T12008] kfree_skb+0x473/0x4c0 [ 189.089278][T12008] ? packet_rcv_spkt+0x719/0x840 [ 189.094575][T12008] packet_rcv_spkt+0x719/0x840 [ 189.099344][T12008] ? packet_rcv+0x2190/0x2190 [ 189.104011][T12008] dev_queue_xmit_nit+0x1125/0x1200 [ 189.109253][T12008] dev_hard_start_xmit+0x21e/0xab0 [ 189.114374][T12008] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 189.120363][T12008] sch_direct_xmit+0x56c/0x18c0 [ 189.125208][T12008] ? kmsan_set_origin+0x26d/0x340 [ 189.130348][T12008] __dev_queue_xmit+0x1e53/0x4270 [ 189.135406][T12008] dev_queue_xmit+0x4b/0x60 [ 189.139904][T12008] ip_finish_output2+0x20c6/0x25d0 [ 189.145004][T12008] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 189.151056][T12008] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 189.157357][T12008] __ip_finish_output+0xaf8/0xda0 [ 189.163540][T12008] ip_finish_output+0x2db/0x420 [ 189.169097][T12008] ip_output+0x541/0x610 [ 189.173343][T12008] ? ip_mc_finish_output+0x6d0/0x6d0 [ 189.178618][T12008] ? ip_finish_output+0x420/0x420 [ 189.184327][T12008] __ip_queue_xmit+0x1caf/0x21f0 [ 189.189261][T12008] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 189.195236][T12008] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 189.201323][T12008] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 189.207417][T12008] ip_queue_xmit+0xcc/0xf0 [ 189.211847][T12008] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 189.217485][T12008] __tcp_transmit_skb+0x409e/0x5c60 [ 189.222730][T12008] __tcp_send_ack+0x701/0x840 [ 189.227432][T12008] tcp_send_ack+0x68/0x90 [ 189.232133][T12008] tcp_cleanup_rbuf+0x764/0x800 [ 189.236990][T12008] tcp_recvmsg+0x334d/0x4ff0 [ 189.241625][T12008] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 189.247598][T12008] ? tcp_mmap+0x150/0x150 [ 189.251971][T12008] ? tcp_mmap+0x150/0x150 [ 189.256288][T12008] inet_recvmsg+0x237/0x7d0 [ 189.260793][T12008] ? inet_sendpage+0x2c0/0x2c0 [ 189.265549][T12008] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 189.271809][T12008] ? inet_sendpage+0x2c0/0x2c0 [ 189.276746][T12008] ? inet_sendpage+0x2c0/0x2c0 [ 189.281519][T12008] sock_read_iter+0x5be/0x660 [ 189.286237][T12008] ? kernel_sock_ip_overhead+0x340/0x340 [ 189.291965][T12008] __vfs_read+0xa67/0xc90 [ 189.296324][T12008] vfs_read+0x359/0x6f0 [ 189.300777][T12008] ksys_read+0x265/0x430 [ 189.305033][T12008] __se_sys_read+0x92/0xb0 [ 189.309459][T12008] __x64_sys_read+0x4a/0x70 [ 189.313963][T12008] do_syscall_64+0xbc/0xf0 [ 189.318469][T12008] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 189.324377][T12008] RIP: 0033:0x47fcb4 [ 189.328272][T12008] Code: ff ff cc cc cc cc e8 2b 41 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 [ 189.348234][T12008] RSP: 002b:000000c42014b710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 189.356668][T12008] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcb4 [ 189.364655][T12008] RDX: 0000000000001000 RSI: 000000c4202c8000 RDI: 0000000000000003 [ 189.372710][T12008] RBP: 000000c42014b760 R08: 0000000000000000 R09: 0000000000000000 [ 189.380678][T12008] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 189.388645][T12008] R13: 0000000000000008 R14: 0000000000000004 R15: ffffffffffffffff [ 189.396648][T12008] [ 189.398988][T12008] Uninit was stored to memory at: [ 189.404025][T12008] kmsan_internal_chain_origin+0xcc/0x150 [ 189.409734][T12008] __msan_chain_origin+0x6b/0xe0 [ 189.414681][T12008] ___slab_alloc+0x1dbc/0x1fb0 [ 189.419436][T12008] kmem_cache_alloc+0xade/0xd10 [ 189.424292][T12008] skb_clone+0x326/0x5d0 [ 189.428528][T12008] dev_queue_xmit_nit+0x539/0x1200 [ 189.433639][T12008] dev_hard_start_xmit+0x21e/0xab0 [ 189.438737][T12008] sch_direct_xmit+0x56c/0x18c0 [ 189.443577][T12008] __dev_queue_xmit+0x1e53/0x4270 [ 189.448589][T12008] dev_queue_xmit+0x4b/0x60 [ 189.453079][T12008] ip_finish_output2+0x20c6/0x25d0 [ 189.458176][T12008] __ip_finish_output+0xaf8/0xda0 [ 189.463185][T12008] ip_finish_output+0x2db/0x420 [ 189.468032][T12008] ip_output+0x541/0x610 [ 189.472264][T12008] __ip_queue_xmit+0x1caf/0x21f0 [ 189.477192][T12008] ip_queue_xmit+0xcc/0xf0 [ 189.481627][T12008] __tcp_transmit_skb+0x409e/0x5c60 [ 189.486839][T12008] __tcp_send_ack+0x701/0x840 [ 189.491510][T12008] tcp_send_ack+0x68/0x90 [ 189.495824][T12008] tcp_cleanup_rbuf+0x764/0x800 [ 189.500665][T12008] tcp_recvmsg+0x334d/0x4ff0 [ 189.505248][T12008] inet_recvmsg+0x237/0x7d0 [ 189.509747][T12008] sock_read_iter+0x5be/0x660 [ 189.514417][T12008] __vfs_read+0xa67/0xc90 [ 189.518759][T12008] vfs_read+0x359/0x6f0 [ 189.522904][T12008] ksys_read+0x265/0x430 [ 189.527136][T12008] __se_sys_read+0x92/0xb0 [ 189.531542][T12008] __x64_sys_read+0x4a/0x70 [ 189.536037][T12008] do_syscall_64+0xbc/0xf0 [ 189.540443][T12008] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 189.546312][T12008] [ 189.548640][T12008] Uninit was created at: [ 189.552895][T12008] kmsan_internal_poison_shadow+0x53/0xa0 [ 189.558605][T12008] kmsan_slab_free+0x8d/0x100 [ 189.563273][T12008] kmem_cache_free_bulk+0x3ad9/0x3f50 [ 189.568632][T12008] __kfree_skb_flush+0xb0/0x100 [ 189.573509][T12008] net_rx_action+0x1908/0x1950 [ 189.578288][T12008] __do_softirq+0x4a1/0x83a [ 189.582869][T12008] do_softirq_own_stack+0x49/0x80 [ 189.587902][T12008] __local_bh_enable_ip+0x184/0x1d0 [ 189.593091][T12008] local_bh_enable+0x36/0x40 [ 189.597668][T12008] ipt_do_table+0x2806/0x28e0 [ 189.602333][T12008] iptable_raw_hook+0xb5/0xe0 [ 189.606999][T12008] nf_hook_slow+0x18b/0x3f0 [ 189.611502][T12008] __ip_local_out+0x69b/0x800 [ 189.616168][T12008] __ip_queue_xmit+0x1bdc/0x21f0 [ 189.621093][T12008] ip_queue_xmit+0xcc/0xf0 [ 189.625491][T12008] __tcp_transmit_skb+0x409e/0x5c60 [ 189.630764][T12008] __tcp_send_ack+0x701/0x840 [ 189.635464][T12008] tcp_send_ack+0x68/0x90 [ 189.639781][T12008] tcp_cleanup_rbuf+0x764/0x800 [ 189.644620][T12008] tcp_recvmsg+0x334d/0x4ff0 [ 189.649368][T12008] inet_recvmsg+0x237/0x7d0 [ 189.655439][T12008] sock_read_iter+0x5be/0x660 [ 189.660569][T12008] __vfs_read+0xa67/0xc90 [ 189.665483][T12008] vfs_read+0x359/0x6f0 [ 189.669644][T12008] ksys_read+0x265/0x430 [ 189.673879][T12008] __se_sys_read+0x92/0xb0 [ 189.678293][T12008] __x64_sys_read+0x4a/0x70 [ 189.682786][T12008] do_syscall_64+0xbc/0xf0 [ 189.687197][T12008] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 189.693162][T12008] ================================================================== [ 189.701208][T12008] Disabling lock debugging due to kernel taint [ 189.707356][T12008] Kernel panic - not syncing: panic_on_warn set ... [ 189.713954][T12008] CPU: 0 PID: 12008 Comm: syz-fuzzer Tainted: G B 5.3.0-rc3+ #17 [ 189.722971][T12008] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 189.733021][T12008] Call Trace: [ 189.736315][T12008] dump_stack+0x191/0x1f0 [ 189.740660][T12008] panic+0x3c9/0xc1e [ 189.744580][T12008] kmsan_report+0x2ca/0x2d0 [ 189.749096][T12008] __msan_warning+0x75/0xe0 [ 189.754093][T12008] kmem_cache_free+0x3df/0x2b70 [ 189.758957][T12008] ? kfree_skb+0x473/0x4c0 [ 189.763386][T12008] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 189.769505][T12008] kfree_skb+0x473/0x4c0 [ 189.774065][T12008] ? packet_rcv_spkt+0x719/0x840 [ 189.779010][T12008] packet_rcv_spkt+0x719/0x840 [ 189.783785][T12008] ? packet_rcv+0x2190/0x2190 [ 189.788474][T12008] dev_queue_xmit_nit+0x1125/0x1200 [ 189.793695][T12008] dev_hard_start_xmit+0x21e/0xab0 [ 189.798812][T12008] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 189.804811][T12008] sch_direct_xmit+0x56c/0x18c0 [ 189.810094][T12008] ? kmsan_set_origin+0x26d/0x340 [ 189.815135][T12008] __dev_queue_xmit+0x1e53/0x4270 [ 189.820187][T12008] dev_queue_xmit+0x4b/0x60 [ 189.824701][T12008] ip_finish_output2+0x20c6/0x25d0 [ 189.829810][T12008] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 189.835878][T12008] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 189.841883][T12008] __ip_finish_output+0xaf8/0xda0 [ 189.846920][T12008] ip_finish_output+0x2db/0x420 [ 189.851780][T12008] ip_output+0x541/0x610 [ 189.856356][T12008] ? ip_mc_finish_output+0x6d0/0x6d0 [ 189.861642][T12008] ? ip_finish_output+0x420/0x420 [ 189.866664][T12008] __ip_queue_xmit+0x1caf/0x21f0 [ 189.871607][T12008] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 189.877592][T12008] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 189.883668][T12008] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 189.889772][T12008] ip_queue_xmit+0xcc/0xf0 [ 189.894193][T12008] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 189.899825][T12008] __tcp_transmit_skb+0x409e/0x5c60 [ 189.905063][T12008] __tcp_send_ack+0x701/0x840 [ 189.909753][T12008] tcp_send_ack+0x68/0x90 [ 189.914086][T12008] tcp_cleanup_rbuf+0x764/0x800 [ 189.918942][T12008] tcp_recvmsg+0x334d/0x4ff0 [ 189.923602][T12008] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 189.929581][T12008] ? tcp_mmap+0x150/0x150 [ 189.933919][T12008] ? tcp_mmap+0x150/0x150 [ 189.938254][T12008] inet_recvmsg+0x237/0x7d0 [ 189.942772][T12008] ? inet_sendpage+0x2c0/0x2c0 [ 189.947530][T12008] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 189.953518][T12008] ? inet_sendpage+0x2c0/0x2c0 [ 189.958301][T12008] ? inet_sendpage+0x2c0/0x2c0 [ 189.963180][T12008] sock_read_iter+0x5be/0x660 [ 189.967886][T12008] ? kernel_sock_ip_overhead+0x340/0x340 [ 189.973589][T12008] __vfs_read+0xa67/0xc90 [ 189.977945][T12008] vfs_read+0x359/0x6f0 [ 189.982114][T12008] ksys_read+0x265/0x430 [ 189.986365][T12008] __se_sys_read+0x92/0xb0 [ 189.990784][T12008] __x64_sys_read+0x4a/0x70 [ 189.995289][T12008] do_syscall_64+0xbc/0xf0 [ 189.999707][T12008] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 190.005610][T12008] RIP: 0033:0x47fcb4 [ 190.009528][T12008] Code: ff ff cc cc cc cc e8 2b 41 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 [ 190.029235][T12008] RSP: 002b:000000c42014b710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 190.038684][T12008] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcb4 [ 190.046762][T12008] RDX: 0000000000001000 RSI: 000000c4202c8000 RDI: 0000000000000003 [ 190.063461][T12008] RBP: 000000c42014b760 R08: 0000000000000000 R09: 0000000000000000 [ 190.071457][T12008] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 190.079527][T12008] R13: 0000000000000008 R14: 0000000000000004 R15: ffffffffffffffff [ 190.088672][T12008] Kernel Offset: disabled [ 190.093008][T12008] Rebooting in 86400 seconds..