[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 76.301328][ T32] audit: type=1800 audit(1570609433.344:25): pid=10930 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 76.328930][ T32] audit: type=1800 audit(1570609433.374:26): pid=10930 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 76.372033][ T32] audit: type=1800 audit(1570609433.404:27): pid=10930 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 '10.128.10.35' (ECDSA) to the list of known hosts. 2019/10/09 08:24:09 fuzzer started 2019/10/09 08:24:13 dialing manager at 10.128.0.26:43589 2019/10/09 08:24:13 syscalls: 2412 2019/10/09 08:24:13 code coverage: enabled 2019/10/09 08:24:13 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/10/09 08:24:13 extra coverage: enabled 2019/10/09 08:24:13 setuid sandbox: enabled 2019/10/09 08:24:13 namespace sandbox: enabled 2019/10/09 08:24:13 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/09 08:24:13 fault injection: enabled 2019/10/09 08:24:13 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/09 08:24:13 net packet injection: enabled 2019/10/09 08:24:13 net device setup: enabled 2019/10/09 08:24:13 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist syzkaller login: [ 102.896661][T11078] ===================================================== [ 102.903665][T11078] BUG: KMSAN: use-after-free in kfree_skb+0x473/0x4c0 [ 102.910439][T11078] CPU: 1 PID: 11078 Comm: syz-fuzzer Not tainted 5.3.0-rc7+ #0 [ 102.917975][T11078] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 102.928028][T11078] Call Trace: [ 102.931335][T11078] dump_stack+0x191/0x1f0 [ 102.935692][T11078] kmsan_report+0x17d/0x2f0 [ 102.940204][T11078] __msan_warning+0x73/0xe0 [ 102.944720][T11078] kmem_cache_free+0x3df/0x2b70 [ 102.949591][T11078] ? kmsan_internal_set_origin+0x6a/0xb0 [ 102.955227][T11078] ? kfree_skb+0x473/0x4c0 [ 102.959675][T11078] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 102.965801][T11078] kfree_skb+0x473/0x4c0 [ 102.970061][T11078] ? packet_rcv_spkt+0x719/0x840 [ 102.974985][T11078] packet_rcv_spkt+0x719/0x840 [ 102.979780][T11078] ? packet_rcv+0x2190/0x2190 [ 102.984437][T11078] dev_queue_xmit_nit+0x1125/0x1200 [ 102.989623][T11078] dev_hard_start_xmit+0x21e/0xab0 [ 102.995209][T11078] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 103.001090][T11078] sch_direct_xmit+0x56c/0x18c0 [ 103.005934][T11078] __dev_queue_xmit+0x1e53/0x4270 [ 103.011063][T11078] dev_queue_xmit+0x4b/0x60 [ 103.015583][T11078] ip_finish_output2+0x20c6/0x25d0 [ 103.020687][T11078] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 103.026742][T11078] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 103.032722][T11078] __ip_finish_output+0xaf8/0xda0 [ 103.037733][T11078] ip_finish_output+0x2db/0x420 [ 103.042570][T11078] ip_output+0x541/0x610 [ 103.046793][T11078] ? ip_mc_finish_output+0x6d0/0x6d0 [ 103.052054][T11078] ? ip_finish_output+0x420/0x420 [ 103.057053][T11078] __ip_queue_xmit+0x1caf/0x21f0 [ 103.061990][T11078] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 103.067885][T11078] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 103.073941][T11078] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 103.080000][T11078] ip_queue_xmit+0xcc/0xf0 [ 103.084397][T11078] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 103.090007][T11078] __tcp_transmit_skb+0x409e/0x5c60 [ 103.095219][T11078] __tcp_send_ack+0x701/0x840 [ 103.099878][T11078] tcp_send_ack+0x68/0x90 [ 103.104187][T11078] tcp_cleanup_rbuf+0x764/0x800 [ 103.109019][T11078] tcp_recvmsg+0x334d/0x4ff0 [ 103.113609][T11078] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 103.119493][T11078] ? tcp_mmap+0x150/0x150 [ 103.123794][T11078] ? tcp_mmap+0x150/0x150 [ 103.128099][T11078] inet_recvmsg+0x237/0x7d0 [ 103.132584][T11078] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 103.138465][T11078] ? inet_sendpage+0x2c0/0x2c0 [ 103.143205][T11078] ? inet_sendpage+0x2c0/0x2c0 [ 103.147960][T11078] sock_read_iter+0x5be/0x660 [ 103.152630][T11078] ? kernel_sock_ip_overhead+0x340/0x340 [ 103.158239][T11078] __vfs_read+0xa67/0xc90 [ 103.162556][T11078] vfs_read+0x359/0x6f0 [ 103.166692][T11078] ksys_read+0x265/0x430 [ 103.170924][T11078] __se_sys_read+0x92/0xb0 [ 103.175322][T11078] __x64_sys_read+0x4a/0x70 [ 103.179810][T11078] do_syscall_64+0xbc/0xf0 [ 103.184206][T11078] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 103.190084][T11078] RIP: 0033:0x47fd44 [ 103.193965][T11078] 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 [ 103.213642][T11078] RSP: 002b:000000c4203d1710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 103.222474][T11078] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 103.230770][T11078] RDX: 0000000000001000 RSI: 000000c420378000 RDI: 0000000000000003 [ 103.238719][T11078] RBP: 000000c4203d1760 R08: 0000000000000000 R09: 0000000000000000 [ 103.246668][T11078] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 103.254618][T11078] R13: 0000000000000008 R14: 0000000000000002 R15: ffffffffffffffff [ 103.262587][T11078] [ 103.264890][T11078] Uninit was stored to memory at: [ 103.269907][T11078] kmsan_internal_chain_origin+0xde/0x190 [ 103.275600][T11078] __msan_chain_origin+0x6b/0xe0 [ 103.280517][T11078] ___slab_alloc+0x1dbc/0x1fb0 [ 103.285256][T11078] kmem_cache_alloc+0xade/0xd10 [ 103.290083][T11078] skb_clone+0x326/0x5d0 [ 103.294301][T11078] dev_queue_xmit_nit+0x539/0x1200 [ 103.299389][T11078] dev_hard_start_xmit+0x21e/0xab0 [ 103.304497][T11078] sch_direct_xmit+0x56c/0x18c0 [ 103.309326][T11078] __dev_queue_xmit+0x1e53/0x4270 [ 103.314325][T11078] dev_queue_xmit+0x4b/0x60 [ 103.319087][T11078] ip_finish_output2+0x20c6/0x25d0 [ 103.324195][T11078] __ip_finish_output+0xaf8/0xda0 [ 103.329201][T11078] ip_finish_output+0x2db/0x420 [ 103.334032][T11078] ip_output+0x541/0x610 [ 103.338259][T11078] __ip_queue_xmit+0x1caf/0x21f0 [ 103.343180][T11078] ip_queue_xmit+0xcc/0xf0 [ 103.347581][T11078] __tcp_transmit_skb+0x409e/0x5c60 [ 103.352756][T11078] __tcp_send_ack+0x701/0x840 [ 103.357410][T11078] tcp_send_ack+0x68/0x90 [ 103.361725][T11078] tcp_cleanup_rbuf+0x764/0x800 [ 103.366547][T11078] tcp_recvmsg+0x334d/0x4ff0 [ 103.371124][T11078] inet_recvmsg+0x237/0x7d0 [ 103.375602][T11078] sock_read_iter+0x5be/0x660 [ 103.380261][T11078] __vfs_read+0xa67/0xc90 [ 103.384563][T11078] vfs_read+0x359/0x6f0 [ 103.388702][T11078] ksys_read+0x265/0x430 [ 103.392930][T11078] __se_sys_read+0x92/0xb0 [ 103.397323][T11078] __x64_sys_read+0x4a/0x70 [ 103.401804][T11078] do_syscall_64+0xbc/0xf0 [ 103.406210][T11078] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 103.412083][T11078] [ 103.414391][T11078] Uninit was created at: [ 103.418609][T11078] kmsan_internal_poison_shadow+0x60/0x120 [ 103.424405][T11078] kmsan_slab_free+0x8d/0x100 [ 103.429102][T11078] kmem_cache_free_bulk+0x3ad9/0x3f50 [ 103.434519][T11078] __kfree_skb_flush+0xb0/0x100 [ 103.439396][T11078] net_rx_action+0x1908/0x1950 [ 103.444157][T11078] __do_softirq+0x4a1/0x83a [ 103.448649][T11078] irq_exit+0x230/0x280 [ 103.452784][T11078] do_IRQ+0x20d/0x3a0 [ 103.456792][T11078] ret_from_intr+0x0/0x33 [ 103.461100][T11078] _raw_spin_unlock_irqrestore+0x4b/0x70 [ 103.466709][T11078] hrtimer_start_range_ns+0x1570/0x16b0 [ 103.472230][T11078] schedule_hrtimeout_range_clock+0x2e2/0x560 [ 103.478269][T11078] schedule_hrtimeout_range+0x97/0xb0 [ 103.483619][T11078] do_select+0x2c3c/0x2df0 [ 103.488451][T11078] core_sys_select+0x949/0xe90 [ 103.493195][T11078] __se_sys_pselect6+0x741/0x8e0 [ 103.498158][T11078] __x64_sys_pselect6+0x6e/0x90 [ 103.502996][T11078] do_syscall_64+0xbc/0xf0 [ 103.507401][T11078] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 103.513269][T11078] ===================================================== [ 103.520181][T11078] Disabling lock debugging due to kernel taint [ 103.526310][T11078] Kernel panic - not syncing: panic_on_warn set ... [ 103.532906][T11078] CPU: 1 PID: 11078 Comm: syz-fuzzer Tainted: G B 5.3.0-rc7+ #0 [ 103.541833][T11078] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 103.551873][T11078] Call Trace: [ 103.555155][T11078] dump_stack+0x191/0x1f0 [ 103.559651][T11078] panic+0x3c9/0xc1e [ 103.563547][T11078] kmsan_report+0x2e5/0x2f0 [ 103.568031][T11078] __msan_warning+0x73/0xe0 [ 103.572521][T11078] kmem_cache_free+0x3df/0x2b70 [ 103.577346][T11078] ? kmsan_internal_set_origin+0x6a/0xb0 [ 103.582952][T11078] ? kfree_skb+0x473/0x4c0 [ 103.587431][T11078] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 103.593492][T11078] kfree_skb+0x473/0x4c0 [ 103.597715][T11078] ? packet_rcv_spkt+0x719/0x840 [ 103.602632][T11078] packet_rcv_spkt+0x719/0x840 [ 103.607389][T11078] ? packet_rcv+0x2190/0x2190 [ 103.612051][T11078] dev_queue_xmit_nit+0x1125/0x1200 [ 103.617249][T11078] dev_hard_start_xmit+0x21e/0xab0 [ 103.623140][T11078] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 103.629016][T11078] sch_direct_xmit+0x56c/0x18c0 [ 103.633859][T11078] __dev_queue_xmit+0x1e53/0x4270 [ 103.638876][T11078] dev_queue_xmit+0x4b/0x60 [ 103.643362][T11078] ip_finish_output2+0x20c6/0x25d0 [ 103.648450][T11078] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 103.654494][T11078] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 103.660462][T11078] __ip_finish_output+0xaf8/0xda0 [ 103.665471][T11078] ip_finish_output+0x2db/0x420 [ 103.670306][T11078] ip_output+0x541/0x610 [ 103.674541][T11078] ? ip_mc_finish_output+0x6d0/0x6d0 [ 103.679806][T11078] ? ip_finish_output+0x420/0x420 [ 103.684806][T11078] __ip_queue_xmit+0x1caf/0x21f0 [ 103.689722][T11078] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 103.695601][T11078] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 103.701640][T11078] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 103.707702][T11078] ip_queue_xmit+0xcc/0xf0 [ 103.712099][T11078] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 103.717712][T11078] __tcp_transmit_skb+0x409e/0x5c60 [ 103.722906][T11078] __tcp_send_ack+0x701/0x840 [ 103.727577][T11078] tcp_send_ack+0x68/0x90 [ 103.731896][T11078] tcp_cleanup_rbuf+0x764/0x800 [ 103.736725][T11078] tcp_recvmsg+0x334d/0x4ff0 [ 103.741316][T11078] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 103.747190][T11078] ? tcp_mmap+0x150/0x150 [ 103.751493][T11078] ? tcp_mmap+0x150/0x150 [ 103.755804][T11078] inet_recvmsg+0x237/0x7d0 [ 103.760292][T11078] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 103.766164][T11078] ? inet_sendpage+0x2c0/0x2c0 [ 103.770904][T11078] ? inet_sendpage+0x2c0/0x2c0 [ 103.775644][T11078] sock_read_iter+0x5be/0x660 [ 103.780307][T11078] ? kernel_sock_ip_overhead+0x340/0x340 [ 103.785927][T11078] __vfs_read+0xa67/0xc90 [ 103.790245][T11078] vfs_read+0x359/0x6f0 [ 103.794393][T11078] ksys_read+0x265/0x430 [ 103.798618][T11078] __se_sys_read+0x92/0xb0 [ 103.803013][T11078] __x64_sys_read+0x4a/0x70 [ 103.807501][T11078] do_syscall_64+0xbc/0xf0 [ 103.811897][T11078] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 103.817766][T11078] RIP: 0033:0x47fd44 [ 103.821644][T11078] 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 [ 103.842006][T11078] RSP: 002b:000000c4203d1710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 103.850493][T11078] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 103.858452][T11078] RDX: 0000000000001000 RSI: 000000c420378000 RDI: 0000000000000003 [ 103.866412][T11078] RBP: 000000c4203d1760 R08: 0000000000000000 R09: 0000000000000000 [ 103.874361][T11078] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 103.882315][T11078] R13: 0000000000000008 R14: 0000000000000002 R15: ffffffffffffffff [ 103.891628][T11078] Kernel Offset: disabled [ 103.895954][T11078] Rebooting in 86400 seconds..