[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 85.308578][ T30] audit: type=1800 audit(1572808747.362:25): pid=12239 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 85.343323][ T30] audit: type=1800 audit(1572808747.392:26): pid=12239 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 85.364017][ T30] audit: type=1800 audit(1572808747.392:27): pid=12239 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 '10.128.0.21' (ECDSA) to the list of known hosts. 2019/11/03 19:19:19 fuzzer started 2019/11/03 19:19:24 dialing manager at 10.128.0.26:45579 2019/11/03 19:19:24 syscalls: 2445 2019/11/03 19:19:24 code coverage: enabled 2019/11/03 19:19:24 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/11/03 19:19:24 extra coverage: enabled 2019/11/03 19:19:24 setuid sandbox: enabled 2019/11/03 19:19:24 namespace sandbox: enabled 2019/11/03 19:19:24 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/03 19:19:24 fault injection: enabled 2019/11/03 19:19:24 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/03 19:19:24 net packet injection: enabled 2019/11/03 19:19:24 net device setup: enabled 2019/11/03 19:19:24 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist syzkaller login: [ 130.348312][T12392] ===================================================== [ 130.355316][T12392] BUG: KMSAN: use-after-free in kmem_cache_free+0x3df/0x2b70 [ 130.362694][T12392] CPU: 1 PID: 12392 Comm: syz-fuzzer Not tainted 5.4.0-rc5+ #0 [ 130.370231][T12392] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 130.380288][T12392] Call Trace: [ 130.383758][T12392] dump_stack+0x191/0x1f0 [ 130.388099][T12392] kmsan_report+0x128/0x220 [ 130.392610][T12392] __msan_warning+0x73/0xe0 [ 130.397104][T12392] kmem_cache_free+0x3df/0x2b70 [ 130.401933][T12392] ? kmsan_internal_set_origin+0x6a/0xb0 [ 130.407541][T12392] ? kfree_skb+0x473/0x4c0 [ 130.411934][T12392] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 130.417989][T12392] kfree_skb+0x473/0x4c0 [ 130.422220][T12392] ? packet_rcv_spkt+0x68d/0x7c0 [ 130.427141][T12392] packet_rcv_spkt+0x68d/0x7c0 [ 130.431928][T12392] ? packet_rcv+0x2110/0x2110 [ 130.436583][T12392] dev_queue_xmit_nit+0x1125/0x1200 [ 130.441770][T12392] dev_hard_start_xmit+0x21e/0xab0 [ 130.446879][T12392] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 130.452853][T12392] sch_direct_xmit+0x56c/0x18c0 [ 130.457704][T12392] __dev_queue_xmit+0x212d/0x4200 [ 130.462725][T12392] dev_queue_xmit+0x4b/0x60 [ 130.467208][T12392] ip_finish_output2+0x20d6/0x25d0 [ 130.472296][T12392] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 130.478338][T12392] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 130.484306][T12392] __ip_finish_output+0xaf8/0xda0 [ 130.489365][T12392] ip_finish_output+0x2db/0x420 [ 130.494207][T12392] ip_output+0x541/0x610 [ 130.498604][T12392] ? ip_mc_finish_output+0x6d0/0x6d0 [ 130.503876][T12392] ? ip_finish_output+0x420/0x420 [ 130.508881][T12392] __ip_queue_xmit+0x1caf/0x21f0 [ 130.513800][T12392] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 130.519670][T12392] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 130.525725][T12392] ip_queue_xmit+0xcc/0xf0 [ 130.530163][T12392] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 130.535831][T12392] __tcp_transmit_skb+0x40e3/0x5d90 [ 130.541035][T12392] __tcp_send_ack+0x701/0x840 [ 130.545701][T12392] tcp_send_ack+0x68/0x90 [ 130.550013][T12392] tcp_cleanup_rbuf+0x764/0x800 [ 130.554844][T12392] tcp_recvmsg+0x334d/0x4ff0 [ 130.559438][T12392] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 130.565309][T12392] ? tcp_mmap+0x150/0x150 [ 130.569617][T12392] ? tcp_mmap+0x150/0x150 [ 130.573922][T12392] inet_recvmsg+0x237/0x7d0 [ 130.578420][T12392] ? inet_sendpage+0x2c0/0x2c0 [ 130.583167][T12392] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 130.589037][T12392] ? inet_sendpage+0x2c0/0x2c0 [ 130.593775][T12392] ? inet_sendpage+0x2c0/0x2c0 [ 130.598518][T12392] sock_read_iter+0x5be/0x660 [ 130.603191][T12392] ? kernel_sock_ip_overhead+0x340/0x340 [ 130.608805][T12392] __vfs_read+0xa67/0xc90 [ 130.613137][T12392] vfs_read+0x359/0x6f0 [ 130.617285][T12392] ksys_read+0x265/0x430 [ 130.621510][T12392] __se_sys_read+0x92/0xb0 [ 130.625924][T12392] __x64_sys_read+0x4a/0x70 [ 130.630404][T12392] do_syscall_64+0xb6/0x160 [ 130.634886][T12392] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 130.640757][T12392] RIP: 0033:0x47fd44 [ 130.644630][T12392] 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 [ 130.664223][T12392] RSP: 002b:000000c42028f710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 130.672642][T12392] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 130.680596][T12392] RDX: 0000000000001000 RSI: 000000c420378000 RDI: 0000000000000003 [ 130.688559][T12392] RBP: 000000c42028f760 R08: 0000000000000000 R09: 0000000000000000 [ 130.697118][T12392] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010 [ 130.705156][T12392] R13: 0000000000000010 R14: 0000000000000002 R15: ffffffffffffffff [ 130.713137][T12392] [ 130.715444][T12392] Uninit was stored to memory at: [ 130.720453][T12392] kmsan_internal_chain_origin+0xbd/0x180 [ 130.726151][T12392] __msan_chain_origin+0x6b/0xd0 [ 130.731068][T12392] ___slab_alloc+0x1dbc/0x1fb0 [ 130.735806][T12392] kmem_cache_alloc+0xadf/0xd20 [ 130.740646][T12392] skb_clone+0x326/0x5d0 [ 130.744866][T12392] dev_queue_xmit_nit+0x539/0x1200 [ 130.749962][T12392] dev_hard_start_xmit+0x21e/0xab0 [ 130.755066][T12392] sch_direct_xmit+0x56c/0x18c0 [ 130.759906][T12392] __dev_queue_xmit+0x212d/0x4200 [ 130.764916][T12392] dev_queue_xmit+0x4b/0x60 [ 130.769400][T12392] ip_finish_output2+0x20d6/0x25d0 [ 130.774489][T12392] __ip_finish_output+0xaf8/0xda0 [ 130.779493][T12392] ip_finish_output+0x2db/0x420 [ 130.784322][T12392] ip_output+0x541/0x610 [ 130.788542][T12392] __ip_queue_xmit+0x1caf/0x21f0 [ 130.793459][T12392] ip_queue_xmit+0xcc/0xf0 [ 130.797856][T12392] __tcp_transmit_skb+0x40e3/0x5d90 [ 130.803033][T12392] __tcp_send_ack+0x701/0x840 [ 130.807696][T12392] tcp_send_ack+0x68/0x90 [ 130.812034][T12392] tcp_cleanup_rbuf+0x764/0x800 [ 130.816873][T12392] tcp_recvmsg+0x334d/0x4ff0 [ 130.821444][T12392] inet_recvmsg+0x237/0x7d0 [ 130.825926][T12392] sock_read_iter+0x5be/0x660 [ 130.830581][T12392] __vfs_read+0xa67/0xc90 [ 130.834887][T12392] vfs_read+0x359/0x6f0 [ 130.839021][T12392] ksys_read+0x265/0x430 [ 130.843243][T12392] __se_sys_read+0x92/0xb0 [ 130.847648][T12392] __x64_sys_read+0x4a/0x70 [ 130.852127][T12392] do_syscall_64+0xb6/0x160 [ 130.856610][T12392] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 130.862511][T12392] [ 130.864846][T12392] Uninit was created at: [ 130.869074][T12392] kmsan_internal_poison_shadow+0x60/0x120 [ 130.874859][T12392] kmsan_slab_free+0x8d/0xf0 [ 130.879439][T12392] kmem_cache_free_bulk+0x3ad9/0x3f10 [ 130.884790][T12392] __kfree_skb_flush+0xb0/0x100 [ 130.889626][T12392] net_rx_action+0x1a5e/0x1aa0 [ 130.894374][T12392] __do_softirq+0x4a1/0x83a [ 130.898854][T12392] irq_exit+0x230/0x280 [ 130.902998][T12392] do_IRQ+0x123/0x360 [ 130.906959][T12392] ret_from_intr+0x0/0x33 [ 130.911265][T12392] kmsan_slab_alloc+0xd5/0x120 [ 130.916003][T12392] __kmalloc_node_track_caller+0xd7b/0x1390 [ 130.921887][T12392] __alloc_skb+0x306/0xa10 [ 130.926280][T12392] __tcp_send_ack+0xfb/0x840 [ 130.930860][T12392] tcp_send_ack+0x68/0x90 [ 130.935167][T12392] tcp_cleanup_rbuf+0x764/0x800 [ 130.939994][T12392] tcp_recvmsg+0x334d/0x4ff0 [ 130.944559][T12392] inet_recvmsg+0x237/0x7d0 [ 130.949038][T12392] sock_read_iter+0x5be/0x660 [ 130.953690][T12392] __vfs_read+0xa67/0xc90 [ 130.958084][T12392] vfs_read+0x359/0x6f0 [ 130.962213][T12392] ksys_read+0x265/0x430 [ 130.966428][T12392] __se_sys_read+0x92/0xb0 [ 130.970815][T12392] __x64_sys_read+0x4a/0x70 [ 130.975296][T12392] do_syscall_64+0xb6/0x160 [ 130.979775][T12392] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 130.985636][T12392] ===================================================== [ 130.992545][T12392] Disabling lock debugging due to kernel taint [ 130.998668][T12392] Kernel panic - not syncing: panic_on_warn set ... [ 131.005233][T12392] CPU: 1 PID: 12392 Comm: syz-fuzzer Tainted: G B 5.4.0-rc5+ #0 [ 131.014136][T12392] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 131.024166][T12392] Call Trace: [ 131.027610][T12392] dump_stack+0x191/0x1f0 [ 131.031931][T12392] panic+0x3c9/0xc1e [ 131.035820][T12392] kmsan_report+0x215/0x220 [ 131.040322][T12392] __msan_warning+0x73/0xe0 [ 131.044900][T12392] kmem_cache_free+0x3df/0x2b70 [ 131.049736][T12392] ? kmsan_internal_set_origin+0x6a/0xb0 [ 131.055345][T12392] ? kfree_skb+0x473/0x4c0 [ 131.060175][T12392] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 131.066239][T12392] kfree_skb+0x473/0x4c0 [ 131.070459][T12392] ? packet_rcv_spkt+0x68d/0x7c0 [ 131.075426][T12392] packet_rcv_spkt+0x68d/0x7c0 [ 131.080171][T12392] ? packet_rcv+0x2110/0x2110 [ 131.084825][T12392] dev_queue_xmit_nit+0x1125/0x1200 [ 131.091076][T12392] dev_hard_start_xmit+0x21e/0xab0 [ 131.096173][T12392] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 131.109513][T12392] sch_direct_xmit+0x56c/0x18c0 [ 131.115046][T12392] __dev_queue_xmit+0x212d/0x4200 [ 131.120069][T12392] dev_queue_xmit+0x4b/0x60 [ 131.124561][T12392] ip_finish_output2+0x20d6/0x25d0 [ 131.129679][T12392] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 131.135729][T12392] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 131.141699][T12392] __ip_finish_output+0xaf8/0xda0 [ 131.146708][T12392] ip_finish_output+0x2db/0x420 [ 131.151587][T12392] ip_output+0x541/0x610 [ 131.155917][T12392] ? ip_mc_finish_output+0x6d0/0x6d0 [ 131.161194][T12392] ? ip_finish_output+0x420/0x420 [ 131.166195][T12392] __ip_queue_xmit+0x1caf/0x21f0 [ 131.171114][T12392] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 131.176986][T12392] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 131.183050][T12392] ip_queue_xmit+0xcc/0xf0 [ 131.187461][T12392] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 131.193105][T12392] __tcp_transmit_skb+0x40e3/0x5d90 [ 131.198313][T12392] __tcp_send_ack+0x701/0x840 [ 131.202974][T12392] tcp_send_ack+0x68/0x90 [ 131.207289][T12392] tcp_cleanup_rbuf+0x764/0x800 [ 131.212119][T12392] tcp_recvmsg+0x334d/0x4ff0 [ 131.216711][T12392] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 131.222594][T12392] ? tcp_mmap+0x150/0x150 [ 131.226932][T12392] ? tcp_mmap+0x150/0x150 [ 131.231320][T12392] inet_recvmsg+0x237/0x7d0 [ 131.235814][T12392] ? inet_sendpage+0x2c0/0x2c0 [ 131.240559][T12392] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 131.246446][T12392] ? inet_sendpage+0x2c0/0x2c0 [ 131.251199][T12392] ? inet_sendpage+0x2c0/0x2c0 [ 131.255947][T12392] sock_read_iter+0x5be/0x660 [ 131.260618][T12392] ? kernel_sock_ip_overhead+0x340/0x340 [ 131.266334][T12392] __vfs_read+0xa67/0xc90 [ 131.270657][T12392] vfs_read+0x359/0x6f0 [ 131.274797][T12392] ksys_read+0x265/0x430 [ 131.279019][T12392] __se_sys_read+0x92/0xb0 [ 131.283414][T12392] __x64_sys_read+0x4a/0x70 [ 131.287894][T12392] do_syscall_64+0xb6/0x160 [ 131.293169][T12392] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 131.299036][T12392] RIP: 0033:0x47fd44 [ 131.302909][T12392] 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 [ 131.322489][T12392] RSP: 002b:000000c42028f710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 131.330882][T12392] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 131.338855][T12392] RDX: 0000000000001000 RSI: 000000c420378000 RDI: 0000000000000003 [ 131.346812][T12392] RBP: 000000c42028f760 R08: 0000000000000000 R09: 0000000000000000 [ 131.354765][T12392] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010 [ 131.362715][T12392] R13: 0000000000000010 R14: 0000000000000002 R15: ffffffffffffffff [ 131.372128][T12392] Kernel Offset: disabled [ 131.376466][T12392] Rebooting in 86400 seconds..