[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 79.973012][ T32] audit: type=1800 audit(1573582996.025:25): pid=11567 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 79.995742][ T32] audit: type=1800 audit(1573582996.045:26): pid=11567 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 80.030369][ T32] audit: type=1800 audit(1573582996.065:27): pid=11567 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 '10.128.0.231' (ECDSA) to the list of known hosts. 2019/11/12 18:23:29 fuzzer started 2019/11/12 18:23:34 dialing manager at 10.128.0.26:44229 2019/11/12 18:23:34 syscalls: 2397 2019/11/12 18:23:34 code coverage: enabled 2019/11/12 18:23:34 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/11/12 18:23:34 extra coverage: enabled 2019/11/12 18:23:34 setuid sandbox: enabled 2019/11/12 18:23:34 namespace sandbox: enabled 2019/11/12 18:23:34 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/12 18:23:34 fault injection: enabled 2019/11/12 18:23:34 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/12 18:23:34 net packet injection: enabled 2019/11/12 18:23:34 net device setup: enabled 2019/11/12 18:23:34 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2019/11/12 18:23:34 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 172.776694][T11720] ===================================================== [ 172.783715][T11720] BUG: KMSAN: use-after-free in kmem_cache_free+0x3df/0x2b70 [ 172.791092][T11720] CPU: 0 PID: 11720 Comm: syz-fuzzer Not tainted 5.4.0-rc5+ #0 [ 172.798628][T11720] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 172.808705][T11720] Call Trace: [ 172.811998][T11720] dump_stack+0x191/0x1f0 [ 172.816339][T11720] kmsan_report+0x128/0x220 [ 172.820852][T11720] __msan_warning+0x73/0xe0 [ 172.825355][T11720] kmem_cache_free+0x3df/0x2b70 [ 172.830203][T11720] ? kmsan_internal_set_origin+0x6a/0xb0 [ 172.835859][T11720] ? kfree_skb+0x473/0x4c0 [ 172.840293][T11720] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 172.846383][T11720] kfree_skb+0x473/0x4c0 [ 172.850626][T11720] ? packet_rcv_spkt+0x68d/0x7c0 [ 172.855568][T11720] packet_rcv_spkt+0x68d/0x7c0 [ 172.860343][T11720] ? packet_rcv+0x2110/0x2110 [ 172.865023][T11720] dev_queue_xmit_nit+0x1125/0x1200 [ 172.870223][T11720] dev_hard_start_xmit+0x21e/0xab0 [ 172.875320][T11720] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 172.881193][T11720] sch_direct_xmit+0x56c/0x18c0 [ 172.886031][T11720] __dev_queue_xmit+0x212d/0x4200 [ 172.891085][T11720] dev_queue_xmit+0x4b/0x60 [ 172.895569][T11720] ip_finish_output2+0x20d6/0x25d0 [ 172.900659][T11720] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 172.906805][T11720] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 172.912782][T11720] __ip_finish_output+0xaf8/0xda0 [ 172.917833][T11720] ip_finish_output+0x2db/0x420 [ 172.922668][T11720] ip_output+0x541/0x610 [ 172.926899][T11720] ? ip_mc_finish_output+0x6d0/0x6d0 [ 172.932165][T11720] ? ip_finish_output+0x420/0x420 [ 172.937168][T11720] __ip_queue_xmit+0x1caf/0x21f0 [ 172.942089][T11720] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 172.947965][T11720] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 172.954043][T11720] ip_queue_xmit+0xcc/0xf0 [ 172.958442][T11720] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 172.964068][T11720] __tcp_transmit_skb+0x40e3/0x5d90 [ 172.969267][T11720] __tcp_send_ack+0x701/0x840 [ 172.973929][T11720] tcp_send_ack+0x68/0x90 [ 172.978237][T11720] tcp_cleanup_rbuf+0x764/0x800 [ 172.983073][T11720] tcp_recvmsg+0x334d/0x4ff0 [ 172.987668][T11720] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 172.993536][T11720] ? tcp_mmap+0x150/0x150 [ 172.997844][T11720] ? tcp_mmap+0x150/0x150 [ 173.002151][T11720] inet_recvmsg+0x237/0x7d0 [ 173.006634][T11720] ? inet_sendpage+0x2c0/0x2c0 [ 173.011391][T11720] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 173.017275][T11720] ? inet_sendpage+0x2c0/0x2c0 [ 173.022039][T11720] ? inet_sendpage+0x2c0/0x2c0 [ 173.026786][T11720] sock_read_iter+0x5be/0x660 [ 173.031464][T11720] ? kernel_sock_ip_overhead+0x340/0x340 [ 173.037078][T11720] __vfs_read+0xa67/0xc90 [ 173.041401][T11720] vfs_read+0x359/0x6f0 [ 173.045549][T11720] ksys_read+0x265/0x430 [ 173.049794][T11720] __se_sys_read+0x92/0xb0 [ 173.054209][T11720] __x64_sys_read+0x4a/0x70 [ 173.058732][T11720] do_syscall_64+0xb6/0x160 [ 173.063227][T11720] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 173.069096][T11720] RIP: 0033:0x47fd44 [ 173.072982][T11720] 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 [ 173.092567][T11720] RSP: 002b:000000c4205c4710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 173.100971][T11720] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 173.108930][T11720] RDX: 0000000000001000 RSI: 000000c4202e0000 RDI: 0000000000000003 [ 173.116879][T11720] RBP: 000000c4205c4760 R08: 0000000000000000 R09: 0000000000000000 [ 173.124839][T11720] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 173.132789][T11720] R13: 0000000000000008 R14: 0000000000000004 R15: ffffffffffffffff [ 173.141276][T11720] [ 173.143581][T11720] Uninit was stored to memory at: [ 173.148586][T11720] kmsan_internal_chain_origin+0xbd/0x180 [ 173.154292][T11720] __msan_chain_origin+0x6b/0xd0 [ 173.159202][T11720] ___slab_alloc+0x1dbc/0x1fb0 [ 173.163942][T11720] kmem_cache_alloc+0xadf/0xd20 [ 173.168766][T11720] skb_clone+0x326/0x5d0 [ 173.173024][T11720] dev_queue_xmit_nit+0x539/0x1200 [ 173.178111][T11720] dev_hard_start_xmit+0x21e/0xab0 [ 173.183210][T11720] sch_direct_xmit+0x56c/0x18c0 [ 173.188059][T11720] __dev_queue_xmit+0x212d/0x4200 [ 173.193932][T11720] dev_queue_xmit+0x4b/0x60 [ 173.198418][T11720] ip_finish_output2+0x20d6/0x25d0 [ 173.203513][T11720] __ip_finish_output+0xaf8/0xda0 [ 173.208532][T11720] ip_finish_output+0x2db/0x420 [ 173.213365][T11720] ip_output+0x541/0x610 [ 173.217849][T11720] __ip_queue_xmit+0x1caf/0x21f0 [ 173.222766][T11720] ip_queue_xmit+0xcc/0xf0 [ 173.227166][T11720] __tcp_transmit_skb+0x40e3/0x5d90 [ 173.232343][T11720] __tcp_send_ack+0x701/0x840 [ 173.236994][T11720] tcp_send_ack+0x68/0x90 [ 173.241303][T11720] tcp_cleanup_rbuf+0x764/0x800 [ 173.246141][T11720] tcp_recvmsg+0x334d/0x4ff0 [ 173.250715][T11720] inet_recvmsg+0x237/0x7d0 [ 173.255228][T11720] sock_read_iter+0x5be/0x660 [ 173.259893][T11720] __vfs_read+0xa67/0xc90 [ 173.264196][T11720] vfs_read+0x359/0x6f0 [ 173.268337][T11720] ksys_read+0x265/0x430 [ 173.272567][T11720] __se_sys_read+0x92/0xb0 [ 173.276967][T11720] __x64_sys_read+0x4a/0x70 [ 173.281449][T11720] do_syscall_64+0xb6/0x160 [ 173.285931][T11720] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 173.291830][T11720] [ 173.294146][T11720] Uninit was created at: [ 173.298388][T11720] kmsan_internal_poison_shadow+0x60/0x120 [ 173.304171][T11720] kmsan_slab_free+0x8d/0xf0 [ 173.308734][T11720] kmem_cache_free_bulk+0x3ad9/0x3f10 [ 173.314094][T11720] __kfree_skb_flush+0xb0/0x100 [ 173.319008][T11720] net_rx_action+0x1a5e/0x1aa0 [ 173.323747][T11720] __do_softirq+0x4a1/0x83a [ 173.328243][T11720] irq_exit+0x230/0x280 [ 173.332395][T11720] do_IRQ+0x123/0x360 [ 173.336354][T11720] ret_from_intr+0x0/0x33 [ 173.340680][T11720] default_idle+0x53/0x90 [ 173.344988][T11720] arch_cpu_idle+0x25/0x30 [ 173.349402][T11720] do_idle+0x1d5/0x780 [ 173.353550][T11720] cpu_startup_entry+0x45/0x50 [ 173.358289][T11720] rest_init+0x1be/0x1f0 [ 173.362510][T11720] arch_call_rest_init+0x13/0x15 [ 173.367426][T11720] start_kernel+0x987/0xb57 [ 173.371908][T11720] x86_64_start_reservations+0x18/0x2e [ 173.377354][T11720] x86_64_start_kernel+0x81/0x84 [ 173.382276][T11720] secondary_startup_64+0xa4/0xb0 [ 173.387272][T11720] ===================================================== [ 173.394175][T11720] Disabling lock debugging due to kernel taint [ 173.400301][T11720] Kernel panic - not syncing: panic_on_warn set ... [ 173.406866][T11720] CPU: 0 PID: 11720 Comm: syz-fuzzer Tainted: G B 5.4.0-rc5+ #0 [ 173.415768][T11720] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 173.425802][T11720] Call Trace: [ 173.429095][T11720] dump_stack+0x191/0x1f0 [ 173.433415][T11720] panic+0x3c9/0xc1e [ 173.437301][T11720] kmsan_report+0x215/0x220 [ 173.441790][T11720] __msan_warning+0x73/0xe0 [ 173.446275][T11720] kmem_cache_free+0x3df/0x2b70 [ 173.451106][T11720] ? kmsan_internal_set_origin+0x6a/0xb0 [ 173.456724][T11720] ? kfree_skb+0x473/0x4c0 [ 173.461222][T11720] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 173.467287][T11720] kfree_skb+0x473/0x4c0 [ 173.471510][T11720] ? packet_rcv_spkt+0x68d/0x7c0 [ 173.476624][T11720] packet_rcv_spkt+0x68d/0x7c0 [ 173.481382][T11720] ? packet_rcv+0x2110/0x2110 [ 173.486050][T11720] dev_queue_xmit_nit+0x1125/0x1200 [ 173.491252][T11720] dev_hard_start_xmit+0x21e/0xab0 [ 173.499485][T11720] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 173.511281][T11720] sch_direct_xmit+0x56c/0x18c0 [ 173.516121][T11720] __dev_queue_xmit+0x212d/0x4200 [ 173.521146][T11720] dev_queue_xmit+0x4b/0x60 [ 173.525630][T11720] ip_finish_output2+0x20d6/0x25d0 [ 173.530719][T11720] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 173.536783][T11720] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 173.542757][T11720] __ip_finish_output+0xaf8/0xda0 [ 173.547776][T11720] ip_finish_output+0x2db/0x420 [ 173.552624][T11720] ip_output+0x541/0x610 [ 173.556851][T11720] ? ip_mc_finish_output+0x6d0/0x6d0 [ 173.562133][T11720] ? ip_finish_output+0x420/0x420 [ 173.567135][T11720] __ip_queue_xmit+0x1caf/0x21f0 [ 173.572059][T11720] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 173.577934][T11720] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 173.583991][T11720] ip_queue_xmit+0xcc/0xf0 [ 173.588400][T11720] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 173.594008][T11720] __tcp_transmit_skb+0x40e3/0x5d90 [ 173.599212][T11720] __tcp_send_ack+0x701/0x840 [ 173.603877][T11720] tcp_send_ack+0x68/0x90 [ 173.608186][T11720] tcp_cleanup_rbuf+0x764/0x800 [ 173.613032][T11720] tcp_recvmsg+0x334d/0x4ff0 [ 173.617624][T11720] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 173.623493][T11720] ? tcp_mmap+0x150/0x150 [ 173.627806][T11720] ? tcp_mmap+0x150/0x150 [ 173.632124][T11720] inet_recvmsg+0x237/0x7d0 [ 173.636618][T11720] ? inet_sendpage+0x2c0/0x2c0 [ 173.641359][T11720] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 173.647241][T11720] ? inet_sendpage+0x2c0/0x2c0 [ 173.652000][T11720] ? inet_sendpage+0x2c0/0x2c0 [ 173.656739][T11720] sock_read_iter+0x5be/0x660 [ 173.661414][T11720] ? kernel_sock_ip_overhead+0x340/0x340 [ 173.667033][T11720] __vfs_read+0xa67/0xc90 [ 173.671372][T11720] vfs_read+0x359/0x6f0 [ 173.675512][T11720] ksys_read+0x265/0x430 [ 173.679750][T11720] __se_sys_read+0x92/0xb0 [ 173.684148][T11720] __x64_sys_read+0x4a/0x70 [ 173.688631][T11720] do_syscall_64+0xb6/0x160 [ 173.693114][T11720] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 173.698985][T11720] RIP: 0033:0x47fd44 [ 173.702869][T11720] 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 [ 173.722468][T11720] RSP: 002b:000000c4205c4710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 173.730856][T11720] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 173.738832][T11720] RDX: 0000000000001000 RSI: 000000c4202e0000 RDI: 0000000000000003 [ 173.746782][T11720] RBP: 000000c4205c4760 R08: 0000000000000000 R09: 0000000000000000 [ 173.754730][T11720] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 173.762694][T11720] R13: 0000000000000008 R14: 0000000000000004 R15: ffffffffffffffff [ 173.771957][T11720] Kernel Offset: disabled [ 173.776294][T11720] Rebooting in 86400 seconds..