[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 88.413577][ T30] audit: type=1800 audit(1574050081.467:25): pid=12749 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 88.442806][ T30] audit: type=1800 audit(1574050081.487:26): pid=12749 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 88.463075][ T30] audit: type=1800 audit(1574050081.497:27): pid=12749 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 '10.128.1.14' (ECDSA) to the list of known hosts. 2019/11/18 04:08:16 fuzzer started 2019/11/18 04:08:21 dialing manager at 10.128.0.26:39269 2019/11/18 04:08:21 syscalls: 2397 2019/11/18 04:08:21 code coverage: enabled 2019/11/18 04:08:21 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/11/18 04:08:21 extra coverage: enabled 2019/11/18 04:08:21 setuid sandbox: enabled 2019/11/18 04:08:21 namespace sandbox: enabled 2019/11/18 04:08:21 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/18 04:08:21 fault injection: enabled 2019/11/18 04:08:21 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/18 04:08:21 net packet injection: enabled 2019/11/18 04:08:21 net device setup: enabled 2019/11/18 04:08:21 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2019/11/18 04:08:21 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 155.016439][T12902] ===================================================== [ 155.023480][T12902] BUG: KMSAN: use-after-free in kmem_cache_free+0x3df/0x2b70 [ 155.030862][T12902] CPU: 1 PID: 12902 Comm: syz-fuzzer Not tainted 5.4.0-rc5+ #0 [ 155.038400][T12902] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 155.048454][T12902] Call Trace: [ 155.051754][T12902] dump_stack+0x191/0x1f0 [ 155.056100][T12902] kmsan_report+0x128/0x220 [ 155.060623][T12902] __msan_warning+0x73/0xe0 [ 155.065137][T12902] kmem_cache_free+0x3df/0x2b70 [ 155.070067][T12902] ? kmsan_internal_set_origin+0x6a/0xb0 [ 155.075693][T12902] ? kfree_skb+0x473/0x4c0 [ 155.080104][T12902] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 155.086221][T12902] kfree_skb+0x473/0x4c0 [ 155.090647][T12902] ? packet_rcv_spkt+0x68d/0x7c0 [ 155.095578][T12902] packet_rcv_spkt+0x68d/0x7c0 [ 155.100326][T12902] ? packet_rcv+0x2110/0x2110 [ 155.104981][T12902] dev_queue_xmit_nit+0x1125/0x1200 [ 155.110172][T12902] dev_hard_start_xmit+0x21e/0xab0 [ 155.115271][T12902] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 155.121159][T12902] sch_direct_xmit+0x56c/0x18c0 [ 155.126004][T12902] __dev_queue_xmit+0x212d/0x4200 [ 155.131023][T12902] dev_queue_xmit+0x4b/0x60 [ 155.135507][T12902] ip_finish_output2+0x20d6/0x25d0 [ 155.140609][T12902] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 155.146654][T12902] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 155.152622][T12902] __ip_finish_output+0xaf8/0xda0 [ 155.157630][T12902] ip_finish_output+0x2db/0x420 [ 155.162465][T12902] ip_output+0x541/0x610 [ 155.166693][T12902] ? ip_mc_finish_output+0x6d0/0x6d0 [ 155.171958][T12902] ? ip_finish_output+0x420/0x420 [ 155.176978][T12902] __ip_queue_xmit+0x1caf/0x21f0 [ 155.181901][T12902] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 155.187773][T12902] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 155.193829][T12902] ip_queue_xmit+0xcc/0xf0 [ 155.198239][T12902] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 155.203863][T12902] __tcp_transmit_skb+0x40e3/0x5d90 [ 155.209070][T12902] __tcp_send_ack+0x701/0x840 [ 155.213738][T12902] tcp_send_ack+0x68/0x90 [ 155.218174][T12902] tcp_cleanup_rbuf+0x764/0x800 [ 155.223011][T12902] tcp_recvmsg+0x334d/0x4ff0 [ 155.227607][T12902] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 155.233497][T12902] ? tcp_mmap+0x150/0x150 [ 155.237818][T12902] ? tcp_mmap+0x150/0x150 [ 155.242124][T12902] inet_recvmsg+0x237/0x7d0 [ 155.246605][T12902] ? inet_sendpage+0x2c0/0x2c0 [ 155.251347][T12902] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 155.257229][T12902] ? inet_sendpage+0x2c0/0x2c0 [ 155.261968][T12902] ? inet_sendpage+0x2c0/0x2c0 [ 155.266713][T12902] sock_read_iter+0x5be/0x660 [ 155.271377][T12902] ? kernel_sock_ip_overhead+0x340/0x340 [ 155.277003][T12902] __vfs_read+0xa67/0xc90 [ 155.281323][T12902] vfs_read+0x359/0x6f0 [ 155.285459][T12902] ksys_read+0x265/0x430 [ 155.289683][T12902] __se_sys_read+0x92/0xb0 [ 155.294094][T12902] __x64_sys_read+0x4a/0x70 [ 155.298593][T12902] do_syscall_64+0xb6/0x160 [ 155.303076][T12902] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 155.308943][T12902] RIP: 0033:0x47fd44 [ 155.312847][T12902] 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 [ 155.332436][T12902] RSP: 002b:000000c420397760 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 155.340886][T12902] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 155.348862][T12902] RDX: 0000000000001000 RSI: 000000c420364000 RDI: 0000000000000003 [ 155.356820][T12902] RBP: 000000c4203977b0 R08: 0000000000000000 R09: 0000000000000000 [ 155.364773][T12902] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 155.372728][T12902] R13: 0000000000000004 R14: 0000000000000002 R15: ffffffffffffffff [ 155.380729][T12902] [ 155.383039][T12902] Uninit was stored to memory at: [ 155.388090][T12902] kmsan_internal_chain_origin+0xbd/0x180 [ 155.393789][T12902] __msan_chain_origin+0x6b/0xd0 [ 155.398705][T12902] ___slab_alloc+0x1dbc/0x1fb0 [ 155.403445][T12902] kmem_cache_alloc+0xadf/0xd20 [ 155.408269][T12902] skb_clone+0x326/0x5d0 [ 155.412607][T12902] dev_queue_xmit_nit+0x539/0x1200 [ 155.417703][T12902] dev_hard_start_xmit+0x21e/0xab0 [ 155.422789][T12902] sch_direct_xmit+0x56c/0x18c0 [ 155.427628][T12902] __dev_queue_xmit+0x212d/0x4200 [ 155.432626][T12902] dev_queue_xmit+0x4b/0x60 [ 155.437106][T12902] ip_finish_output2+0x20d6/0x25d0 [ 155.442191][T12902] __ip_finish_output+0xaf8/0xda0 [ 155.447192][T12902] ip_finish_output+0x2db/0x420 [ 155.452038][T12902] ip_output+0x541/0x610 [ 155.456257][T12902] __ip_queue_xmit+0x1caf/0x21f0 [ 155.461168][T12902] ip_queue_xmit+0xcc/0xf0 [ 155.465572][T12902] __tcp_transmit_skb+0x40e3/0x5d90 [ 155.470747][T12902] __tcp_send_ack+0x701/0x840 [ 155.475411][T12902] tcp_send_ack+0x68/0x90 [ 155.479718][T12902] tcp_cleanup_rbuf+0x764/0x800 [ 155.484543][T12902] tcp_recvmsg+0x334d/0x4ff0 [ 155.489128][T12902] inet_recvmsg+0x237/0x7d0 [ 155.493626][T12902] sock_read_iter+0x5be/0x660 [ 155.498285][T12902] __vfs_read+0xa67/0xc90 [ 155.502599][T12902] vfs_read+0x359/0x6f0 [ 155.506735][T12902] ksys_read+0x265/0x430 [ 155.510967][T12902] __se_sys_read+0x92/0xb0 [ 155.515371][T12902] __x64_sys_read+0x4a/0x70 [ 155.519850][T12902] do_syscall_64+0xb6/0x160 [ 155.524355][T12902] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 155.530258][T12902] [ 155.532564][T12902] Uninit was created at: [ 155.536811][T12902] kmsan_internal_poison_shadow+0x60/0x120 [ 155.542594][T12902] kmsan_slab_free+0x8d/0xf0 [ 155.547174][T12902] kmem_cache_free_bulk+0x3ad9/0x3f10 [ 155.552526][T12902] __kfree_skb_flush+0xb0/0x100 [ 155.557357][T12902] net_rx_action+0x1a5e/0x1aa0 [ 155.562097][T12902] __do_softirq+0x4a1/0x83a [ 155.566576][T12902] irq_exit+0x230/0x280 [ 155.570775][T12902] do_IRQ+0x123/0x360 [ 155.574756][T12902] ret_from_intr+0x0/0x33 [ 155.579062][T12902] ===================================================== [ 155.585979][T12902] Disabling lock debugging due to kernel taint [ 155.592153][T12902] Kernel panic - not syncing: panic_on_warn set ... [ 155.598725][T12902] CPU: 1 PID: 12902 Comm: syz-fuzzer Tainted: G B 5.4.0-rc5+ #0 [ 155.607653][T12902] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 155.617697][T12902] Call Trace: [ 155.620973][T12902] dump_stack+0x191/0x1f0 [ 155.625284][T12902] panic+0x3c9/0xc1e [ 155.629174][T12902] kmsan_report+0x215/0x220 [ 155.633664][T12902] __msan_warning+0x73/0xe0 [ 155.638163][T12902] kmem_cache_free+0x3df/0x2b70 [ 155.643012][T12902] ? kmsan_internal_set_origin+0x6a/0xb0 [ 155.648634][T12902] ? kfree_skb+0x473/0x4c0 [ 155.653030][T12902] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 155.659085][T12902] kfree_skb+0x473/0x4c0 [ 155.663307][T12902] ? packet_rcv_spkt+0x68d/0x7c0 [ 155.668224][T12902] packet_rcv_spkt+0x68d/0x7c0 [ 155.672970][T12902] ? packet_rcv+0x2110/0x2110 [ 155.677630][T12902] dev_queue_xmit_nit+0x1125/0x1200 [ 155.682832][T12902] dev_hard_start_xmit+0x21e/0xab0 [ 155.687926][T12902] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 155.693821][T12902] sch_direct_xmit+0x56c/0x18c0 [ 155.698684][T12902] __dev_queue_xmit+0x212d/0x4200 [ 155.703700][T12902] dev_queue_xmit+0x4b/0x60 [ 155.708188][T12902] ip_finish_output2+0x20d6/0x25d0 [ 155.713279][T12902] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 155.719323][T12902] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 155.725293][T12902] __ip_finish_output+0xaf8/0xda0 [ 155.730305][T12902] ip_finish_output+0x2db/0x420 [ 155.735152][T12902] ip_output+0x541/0x610 [ 155.739383][T12902] ? ip_mc_finish_output+0x6d0/0x6d0 [ 155.744649][T12902] ? ip_finish_output+0x420/0x420 [ 155.749663][T12902] __ip_queue_xmit+0x1caf/0x21f0 [ 155.754584][T12902] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 155.760456][T12902] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 155.766513][T12902] ip_queue_xmit+0xcc/0xf0 [ 155.770908][T12902] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 155.776533][T12902] __tcp_transmit_skb+0x40e3/0x5d90 [ 155.781751][T12902] __tcp_send_ack+0x701/0x840 [ 155.786412][T12902] tcp_send_ack+0x68/0x90 [ 155.790719][T12902] tcp_cleanup_rbuf+0x764/0x800 [ 155.795573][T12902] tcp_recvmsg+0x334d/0x4ff0 [ 155.800171][T12902] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 155.806043][T12902] ? tcp_mmap+0x150/0x150 [ 155.810349][T12902] ? tcp_mmap+0x150/0x150 [ 155.814667][T12902] inet_recvmsg+0x237/0x7d0 [ 155.819150][T12902] ? inet_sendpage+0x2c0/0x2c0 [ 155.823893][T12902] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 155.829763][T12902] ? inet_sendpage+0x2c0/0x2c0 [ 155.834511][T12902] ? inet_sendpage+0x2c0/0x2c0 [ 155.839255][T12902] sock_read_iter+0x5be/0x660 [ 155.843917][T12902] ? kernel_sock_ip_overhead+0x340/0x340 [ 155.849523][T12902] __vfs_read+0xa67/0xc90 [ 155.853843][T12902] vfs_read+0x359/0x6f0 [ 155.857984][T12902] ksys_read+0x265/0x430 [ 155.862210][T12902] __se_sys_read+0x92/0xb0 [ 155.866867][T12902] __x64_sys_read+0x4a/0x70 [ 155.871349][T12902] do_syscall_64+0xb6/0x160 [ 155.876105][T12902] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 155.881972][T12902] RIP: 0033:0x47fd44 [ 155.885866][T12902] 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 [ 155.905463][T12902] RSP: 002b:000000c420397760 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 155.913849][T12902] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 155.921811][T12902] RDX: 0000000000001000 RSI: 000000c420364000 RDI: 0000000000000003 [ 155.929770][T12902] RBP: 000000c4203977b0 R08: 0000000000000000 R09: 0000000000000000 [ 155.937752][T12902] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 155.945733][T12902] R13: 0000000000000004 R14: 0000000000000002 R15: ffffffffffffffff [ 155.955239][T12902] Kernel Offset: disabled [ 155.959575][T12902] Rebooting in 86400 seconds..