[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 86.719223][ T30] audit: type=1800 audit(1572791264.760:25): pid=12297 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 86.744424][ T30] audit: type=1800 audit(1572791264.790:26): pid=12297 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 86.790654][ T30] audit: type=1800 audit(1572791264.820:27): pid=12297 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 '10.128.1.32' (ECDSA) to the list of known hosts. 2019/11/03 14:28:00 fuzzer started 2019/11/03 14:28:05 dialing manager at 10.128.0.26:45579 2019/11/03 14:28:05 syscalls: 2445 2019/11/03 14:28:05 code coverage: enabled 2019/11/03 14:28:05 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/11/03 14:28:05 extra coverage: enabled 2019/11/03 14:28:05 setuid sandbox: enabled 2019/11/03 14:28:05 namespace sandbox: enabled 2019/11/03 14:28:05 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/03 14:28:05 fault injection: enabled 2019/11/03 14:28:05 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/03 14:28:05 net packet injection: enabled 2019/11/03 14:28:05 net device setup: enabled 2019/11/03 14:28:05 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist syzkaller login: [ 158.580927][T12447] ===================================================== [ 158.588012][T12447] BUG: KMSAN: use-after-free in kmem_cache_free+0x3df/0x2b70 [ 158.595377][T12447] CPU: 0 PID: 12447 Comm: syz-fuzzer Not tainted 5.4.0-rc5+ #0 [ 158.603243][T12447] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 158.613277][T12447] Call Trace: [ 158.616556][T12447] dump_stack+0x191/0x1f0 [ 158.620872][T12447] kmsan_report+0x128/0x220 [ 158.625363][T12447] __msan_warning+0x73/0xe0 [ 158.629856][T12447] kmem_cache_free+0x3df/0x2b70 [ 158.634691][T12447] ? kmsan_internal_set_origin+0x6a/0xb0 [ 158.640299][T12447] ? kfree_skb+0x473/0x4c0 [ 158.644751][T12447] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 158.650833][T12447] kfree_skb+0x473/0x4c0 [ 158.655067][T12447] ? packet_rcv_spkt+0x68d/0x7c0 [ 158.660000][T12447] packet_rcv_spkt+0x68d/0x7c0 [ 158.664751][T12447] ? packet_rcv+0x2110/0x2110 [ 158.669409][T12447] dev_queue_xmit_nit+0x1125/0x1200 [ 158.674599][T12447] dev_hard_start_xmit+0x21e/0xab0 [ 158.679699][T12447] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 158.685573][T12447] sch_direct_xmit+0x56c/0x18c0 [ 158.690431][T12447] __dev_queue_xmit+0x212d/0x4200 [ 158.695448][T12447] dev_queue_xmit+0x4b/0x60 [ 158.699932][T12447] ip_finish_output2+0x20d6/0x25d0 [ 158.705018][T12447] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 158.711062][T12447] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 158.717031][T12447] __ip_finish_output+0xaf8/0xda0 [ 158.722560][T12447] ip_finish_output+0x2db/0x420 [ 158.728182][T12447] ip_output+0x541/0x610 [ 158.732418][T12447] ? ip_mc_finish_output+0x6d0/0x6d0 [ 158.737684][T12447] ? ip_finish_output+0x420/0x420 [ 158.742823][T12447] __ip_queue_xmit+0x1caf/0x21f0 [ 158.747748][T12447] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 158.753622][T12447] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 158.759678][T12447] ip_queue_xmit+0xcc/0xf0 [ 158.764078][T12447] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 158.769691][T12447] __tcp_transmit_skb+0x40e3/0x5d90 [ 158.774930][T12447] __tcp_send_ack+0x701/0x840 [ 158.779599][T12447] tcp_send_ack+0x68/0x90 [ 158.783914][T12447] tcp_cleanup_rbuf+0x764/0x800 [ 158.788765][T12447] tcp_recvmsg+0x334d/0x4ff0 [ 158.793391][T12447] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 158.799346][T12447] ? tcp_mmap+0x150/0x150 [ 158.803665][T12447] ? tcp_mmap+0x150/0x150 [ 158.808061][T12447] inet_recvmsg+0x237/0x7d0 [ 158.812549][T12447] ? inet_sendpage+0x2c0/0x2c0 [ 158.817300][T12447] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 158.823431][T12447] ? inet_sendpage+0x2c0/0x2c0 [ 158.828171][T12447] ? inet_sendpage+0x2c0/0x2c0 [ 158.832912][T12447] sock_read_iter+0x5be/0x660 [ 158.837588][T12447] ? kernel_sock_ip_overhead+0x340/0x340 [ 158.843214][T12447] __vfs_read+0xa67/0xc90 [ 158.847554][T12447] vfs_read+0x359/0x6f0 [ 158.851711][T12447] ksys_read+0x265/0x430 [ 158.855945][T12447] __se_sys_read+0x92/0xb0 [ 158.860345][T12447] __x64_sys_read+0x4a/0x70 [ 158.864831][T12447] do_syscall_64+0xb6/0x160 [ 158.869336][T12447] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 158.875253][T12447] RIP: 0033:0x47fd44 [ 158.879149][T12447] 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 [ 158.898757][T12447] RSP: 002b:000000c42019d750 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 158.907255][T12447] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 158.915205][T12447] RDX: 0000000000001000 RSI: 000000c4203e0000 RDI: 0000000000000003 [ 158.923155][T12447] RBP: 000000c42019d7a0 R08: 0000000000000000 R09: 0000000000000000 [ 158.931118][T12447] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000040 [ 158.939066][T12447] R13: 0000000000000040 R14: 0000000000000004 R15: ffffffffffffffff [ 158.947138][T12447] [ 158.949472][T12447] Uninit was stored to memory at: [ 158.954489][T12447] kmsan_internal_chain_origin+0xbd/0x180 [ 158.960190][T12447] __msan_chain_origin+0x6b/0xd0 [ 158.966085][T12447] ___slab_alloc+0x1dbc/0x1fb0 [ 158.971445][T12447] kmem_cache_alloc+0xadf/0xd20 [ 158.976274][T12447] skb_clone+0x326/0x5d0 [ 158.980493][T12447] dev_queue_xmit_nit+0x539/0x1200 [ 158.985590][T12447] dev_hard_start_xmit+0x21e/0xab0 [ 158.990695][T12447] sch_direct_xmit+0x56c/0x18c0 [ 158.995544][T12447] __dev_queue_xmit+0x212d/0x4200 [ 159.000555][T12447] dev_queue_xmit+0x4b/0x60 [ 159.005050][T12447] ip_finish_output2+0x20d6/0x25d0 [ 159.010264][T12447] __ip_finish_output+0xaf8/0xda0 [ 159.015274][T12447] ip_finish_output+0x2db/0x420 [ 159.020117][T12447] ip_output+0x541/0x610 [ 159.024367][T12447] __ip_queue_xmit+0x1caf/0x21f0 [ 159.029833][T12447] ip_queue_xmit+0xcc/0xf0 [ 159.034230][T12447] __tcp_transmit_skb+0x40e3/0x5d90 [ 159.039432][T12447] __tcp_send_ack+0x701/0x840 [ 159.044113][T12447] tcp_send_ack+0x68/0x90 [ 159.048444][T12447] tcp_cleanup_rbuf+0x764/0x800 [ 159.053284][T12447] tcp_recvmsg+0x334d/0x4ff0 [ 159.057860][T12447] inet_recvmsg+0x237/0x7d0 [ 159.062343][T12447] sock_read_iter+0x5be/0x660 [ 159.067037][T12447] __vfs_read+0xa67/0xc90 [ 159.071361][T12447] vfs_read+0x359/0x6f0 [ 159.075523][T12447] ksys_read+0x265/0x430 [ 159.079764][T12447] __se_sys_read+0x92/0xb0 [ 159.084164][T12447] __x64_sys_read+0x4a/0x70 [ 159.089212][T12447] do_syscall_64+0xb6/0x160 [ 159.093979][T12447] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 159.100455][T12447] [ 159.102774][T12447] Uninit was created at: [ 159.107011][T12447] kmsan_internal_poison_shadow+0x60/0x120 [ 159.113070][T12447] kmsan_slab_free+0x8d/0xf0 [ 159.117645][T12447] kmem_cache_free_bulk+0x3ad9/0x3f10 [ 159.123004][T12447] __kfree_skb_flush+0xb0/0x100 [ 159.127851][T12447] net_rx_action+0x1a5e/0x1aa0 [ 159.132611][T12447] __do_softirq+0x4a1/0x83a [ 159.137108][T12447] irq_exit+0x230/0x280 [ 159.141272][T12447] do_IRQ+0x123/0x360 [ 159.146027][T12447] ret_from_intr+0x0/0x33 [ 159.150353][T12447] default_idle+0x53/0x90 [ 159.154769][T12447] arch_cpu_idle+0x25/0x30 [ 159.159180][T12447] do_idle+0x1d5/0x780 [ 159.163241][T12447] cpu_startup_entry+0x45/0x50 [ 159.168207][T12447] rest_init+0x1be/0x1f0 [ 159.172446][T12447] arch_call_rest_init+0x13/0x15 [ 159.177498][T12447] start_kernel+0x987/0xb57 [ 159.181990][T12447] x86_64_start_reservations+0x18/0x2e [ 159.187440][T12447] x86_64_start_kernel+0x81/0x84 [ 159.192378][T12447] secondary_startup_64+0xa4/0xb0 [ 159.197377][T12447] ===================================================== [ 159.204288][T12447] Disabling lock debugging due to kernel taint [ 159.210439][T12447] Kernel panic - not syncing: panic_on_warn set ... [ 159.217016][T12447] CPU: 0 PID: 12447 Comm: syz-fuzzer Tainted: G B 5.4.0-rc5+ #0 [ 159.225933][T12447] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 159.235963][T12447] Call Trace: [ 159.239241][T12447] dump_stack+0x191/0x1f0 [ 159.243641][T12447] panic+0x3c9/0xc1e [ 159.247543][T12447] kmsan_report+0x215/0x220 [ 159.252040][T12447] __msan_warning+0x73/0xe0 [ 159.256521][T12447] kmem_cache_free+0x3df/0x2b70 [ 159.261361][T12447] ? kmsan_internal_set_origin+0x6a/0xb0 [ 159.266982][T12447] ? kfree_skb+0x473/0x4c0 [ 159.271390][T12447] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 159.277463][T12447] kfree_skb+0x473/0x4c0 [ 159.281707][T12447] ? packet_rcv_spkt+0x68d/0x7c0 [ 159.286640][T12447] packet_rcv_spkt+0x68d/0x7c0 [ 159.291398][T12447] ? packet_rcv+0x2110/0x2110 [ 159.296077][T12447] dev_queue_xmit_nit+0x1125/0x1200 [ 159.301267][T12447] dev_hard_start_xmit+0x21e/0xab0 [ 159.306388][T12447] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 159.312283][T12447] sch_direct_xmit+0x56c/0x18c0 [ 159.317124][T12447] __dev_queue_xmit+0x212d/0x4200 [ 159.322154][T12447] dev_queue_xmit+0x4b/0x60 [ 159.326638][T12447] ip_finish_output2+0x20d6/0x25d0 [ 159.331751][T12447] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 159.337809][T12447] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 159.343868][T12447] __ip_finish_output+0xaf8/0xda0 [ 159.348880][T12447] ip_finish_output+0x2db/0x420 [ 159.353714][T12447] ip_output+0x541/0x610 [ 159.357956][T12447] ? ip_mc_finish_output+0x6d0/0x6d0 [ 159.363231][T12447] ? ip_finish_output+0x420/0x420 [ 159.368233][T12447] __ip_queue_xmit+0x1caf/0x21f0 [ 159.373151][T12447] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 159.379025][T12447] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 159.385083][T12447] ip_queue_xmit+0xcc/0xf0 [ 159.389493][T12447] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 159.395292][T12447] __tcp_transmit_skb+0x40e3/0x5d90 [ 159.400518][T12447] __tcp_send_ack+0x701/0x840 [ 159.405206][T12447] tcp_send_ack+0x68/0x90 [ 159.409526][T12447] tcp_cleanup_rbuf+0x764/0x800 [ 159.414410][T12447] tcp_recvmsg+0x334d/0x4ff0 [ 159.419037][T12447] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 159.424915][T12447] ? tcp_mmap+0x150/0x150 [ 159.429244][T12447] ? tcp_mmap+0x150/0x150 [ 159.433572][T12447] inet_recvmsg+0x237/0x7d0 [ 159.438066][T12447] ? inet_sendpage+0x2c0/0x2c0 [ 159.442836][T12447] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 159.448816][T12447] ? inet_sendpage+0x2c0/0x2c0 [ 159.453561][T12447] ? inet_sendpage+0x2c0/0x2c0 [ 159.458311][T12447] sock_read_iter+0x5be/0x660 [ 159.462981][T12447] ? kernel_sock_ip_overhead+0x340/0x340 [ 159.468594][T12447] __vfs_read+0xa67/0xc90 [ 159.472916][T12447] vfs_read+0x359/0x6f0 [ 159.477065][T12447] ksys_read+0x265/0x430 [ 159.481297][T12447] __se_sys_read+0x92/0xb0 [ 159.485965][T12447] __x64_sys_read+0x4a/0x70 [ 159.490473][T12447] do_syscall_64+0xb6/0x160 [ 159.494959][T12447] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 159.500941][T12447] RIP: 0033:0x47fd44 [ 159.504841][T12447] 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 [ 159.524672][T12447] RSP: 002b:000000c42019d750 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 159.533184][T12447] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 159.541152][T12447] RDX: 0000000000001000 RSI: 000000c4203e0000 RDI: 0000000000000003 [ 159.549126][T12447] RBP: 000000c42019d7a0 R08: 0000000000000000 R09: 0000000000000000 [ 159.557085][T12447] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000040 [ 159.565132][T12447] R13: 0000000000000040 R14: 0000000000000004 R15: ffffffffffffffff [ 159.574732][T12447] Kernel Offset: disabled [ 159.579067][T12447] Rebooting in 86400 seconds..