[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 81.633583][ T31] audit: type=1800 audit(1573511071.692:25): pid=11623 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 81.656484][ T31] audit: type=1800 audit(1573511071.712:26): pid=11623 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 81.693494][ T31] audit: type=1800 audit(1573511071.742:27): pid=11623 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 '10.128.10.30' (ECDSA) to the list of known hosts. 2019/11/11 22:24:45 fuzzer started 2019/11/11 22:24:49 dialing manager at 10.128.0.26:44229 2019/11/11 22:24:49 syscalls: 2397 2019/11/11 22:24:49 code coverage: enabled 2019/11/11 22:24:49 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/11/11 22:24:49 extra coverage: enabled 2019/11/11 22:24:49 setuid sandbox: enabled 2019/11/11 22:24:49 namespace sandbox: enabled 2019/11/11 22:24:49 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/11 22:24:49 fault injection: enabled 2019/11/11 22:24:49 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/11 22:24:49 net packet injection: enabled 2019/11/11 22:24:49 net device setup: enabled 2019/11/11 22:24:49 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2019/11/11 22:24:49 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 150.929865][T11774] ===================================================== [ 150.936877][T11774] BUG: KMSAN: use-after-free in kmem_cache_free+0x3df/0x2b70 [ 150.944252][T11774] CPU: 1 PID: 11774 Comm: syz-fuzzer Not tainted 5.4.0-rc5+ #0 [ 150.951789][T11774] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 150.961843][T11774] Call Trace: [ 150.965143][T11774] dump_stack+0x191/0x1f0 [ 150.969500][T11774] kmsan_report+0x128/0x220 [ 150.974014][T11774] __msan_warning+0x73/0xe0 [ 150.978527][T11774] kmem_cache_free+0x3df/0x2b70 [ 150.983380][T11774] ? kmsan_internal_set_origin+0x6a/0xb0 [ 150.988992][T11774] ? kfree_skb+0x473/0x4c0 [ 150.993391][T11774] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 150.999508][T11774] kfree_skb+0x473/0x4c0 [ 151.003729][T11774] ? packet_rcv_spkt+0x68d/0x7c0 [ 151.008645][T11774] packet_rcv_spkt+0x68d/0x7c0 [ 151.013431][T11774] ? packet_rcv+0x2110/0x2110 [ 151.018092][T11774] dev_queue_xmit_nit+0x1125/0x1200 [ 151.023281][T11774] dev_hard_start_xmit+0x21e/0xab0 [ 151.028475][T11774] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 151.034391][T11774] sch_direct_xmit+0x56c/0x18c0 [ 151.039243][T11774] __dev_queue_xmit+0x212d/0x4200 [ 151.044266][T11774] dev_queue_xmit+0x4b/0x60 [ 151.048906][T11774] ip_finish_output2+0x20d6/0x25d0 [ 151.054174][T11774] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 151.060236][T11774] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 151.066213][T11774] __ip_finish_output+0xaf8/0xda0 [ 151.071231][T11774] ip_finish_output+0x2db/0x420 [ 151.076069][T11774] ip_output+0x541/0x610 [ 151.080293][T11774] ? ip_mc_finish_output+0x6d0/0x6d0 [ 151.085558][T11774] ? ip_finish_output+0x420/0x420 [ 151.090576][T11774] __ip_queue_xmit+0x1caf/0x21f0 [ 151.095521][T11774] ip_queue_xmit+0xcc/0xf0 [ 151.099918][T11774] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 151.105541][T11774] __tcp_transmit_skb+0x40e3/0x5d90 [ 151.110735][T11774] __tcp_send_ack+0x701/0x840 [ 151.115400][T11774] tcp_send_ack+0x68/0x90 [ 151.119708][T11774] tcp_cleanup_rbuf+0x764/0x800 [ 151.124539][T11774] tcp_recvmsg+0x334d/0x4ff0 [ 151.129131][T11774] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 151.134999][T11774] ? tcp_mmap+0x150/0x150 [ 151.139316][T11774] ? tcp_mmap+0x150/0x150 [ 151.143625][T11774] inet_recvmsg+0x237/0x7d0 [ 151.148106][T11774] ? inet_sendpage+0x2c0/0x2c0 [ 151.152854][T11774] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 151.158724][T11774] ? inet_sendpage+0x2c0/0x2c0 [ 151.163460][T11774] ? inet_sendpage+0x2c0/0x2c0 [ 151.168201][T11774] sock_read_iter+0x5be/0x660 [ 151.172861][T11774] ? kernel_sock_ip_overhead+0x340/0x340 [ 151.178483][T11774] __vfs_read+0xa67/0xc90 [ 151.182802][T11774] vfs_read+0x359/0x6f0 [ 151.186940][T11774] ksys_read+0x265/0x430 [ 151.191198][T11774] __se_sys_read+0x92/0xb0 [ 151.195604][T11774] __x64_sys_read+0x4a/0x70 [ 151.200189][T11774] do_syscall_64+0xb6/0x160 [ 151.204679][T11774] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 151.210556][T11774] RIP: 0033:0x47fd44 [ 151.214430][T11774] 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 [ 151.234014][T11774] RSP: 002b:000000c4203c7760 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 151.242401][T11774] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 151.250400][T11774] RDX: 0000000000001000 RSI: 000000c420398000 RDI: 0000000000000003 [ 151.258350][T11774] RBP: 000000c4203c77b0 R08: 0000000000000000 R09: 0000000000000000 [ 151.266297][T11774] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010 [ 151.274257][T11774] R13: 0000000000000010 R14: 0000000000000020 R15: ffffffffffffffff [ 151.282227][T11774] [ 151.284539][T11774] Uninit was stored to memory at: [ 151.289576][T11774] kmsan_internal_chain_origin+0xbd/0x180 [ 151.295271][T11774] __msan_chain_origin+0x6b/0xd0 [ 151.300197][T11774] ___slab_alloc+0x1dbc/0x1fb0 [ 151.304934][T11774] kmem_cache_alloc+0xadf/0xd20 [ 151.309768][T11774] skb_clone+0x326/0x5d0 [ 151.313987][T11774] dev_queue_xmit_nit+0x539/0x1200 [ 151.319093][T11774] dev_hard_start_xmit+0x21e/0xab0 [ 151.324215][T11774] sch_direct_xmit+0x56c/0x18c0 [ 151.329050][T11774] __dev_queue_xmit+0x212d/0x4200 [ 151.334060][T11774] dev_queue_xmit+0x4b/0x60 [ 151.338547][T11774] ip_finish_output2+0x20d6/0x25d0 [ 151.343633][T11774] __ip_finish_output+0xaf8/0xda0 [ 151.348631][T11774] ip_finish_output+0x2db/0x420 [ 151.353454][T11774] ip_output+0x541/0x610 [ 151.357671][T11774] __ip_queue_xmit+0x1caf/0x21f0 [ 151.362595][T11774] ip_queue_xmit+0xcc/0xf0 [ 151.367054][T11774] __tcp_transmit_skb+0x40e3/0x5d90 [ 151.372250][T11774] __tcp_send_ack+0x701/0x840 [ 151.376909][T11774] tcp_send_ack+0x68/0x90 [ 151.381214][T11774] tcp_cleanup_rbuf+0x764/0x800 [ 151.386038][T11774] tcp_recvmsg+0x334d/0x4ff0 [ 151.390603][T11774] inet_recvmsg+0x237/0x7d0 [ 151.395098][T11774] sock_read_iter+0x5be/0x660 [ 151.399750][T11774] __vfs_read+0xa67/0xc90 [ 151.404059][T11774] vfs_read+0x359/0x6f0 [ 151.408206][T11774] ksys_read+0x265/0x430 [ 151.412437][T11774] __se_sys_read+0x92/0xb0 [ 151.416833][T11774] __x64_sys_read+0x4a/0x70 [ 151.421319][T11774] do_syscall_64+0xb6/0x160 [ 151.425820][T11774] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 151.431685][T11774] [ 151.433989][T11774] Uninit was created at: [ 151.438211][T11774] kmsan_internal_poison_shadow+0x60/0x120 [ 151.444010][T11774] kmsan_slab_free+0x8d/0xf0 [ 151.448574][T11774] kmem_cache_free_bulk+0x3ad9/0x3f10 [ 151.453919][T11774] __kfree_skb_flush+0xb0/0x100 [ 151.458744][T11774] net_rx_action+0x1a5e/0x1aa0 [ 151.463490][T11774] __do_softirq+0x4a1/0x83a [ 151.467970][T11774] irq_exit+0x230/0x280 [ 151.472101][T11774] do_IRQ+0x123/0x360 [ 151.476059][T11774] ret_from_intr+0x0/0x33 [ 151.480358][T11774] ===================================================== [ 151.487263][T11774] Disabling lock debugging due to kernel taint [ 151.493388][T11774] Kernel panic - not syncing: panic_on_warn set ... [ 151.499953][T11774] CPU: 1 PID: 11774 Comm: syz-fuzzer Tainted: G B 5.4.0-rc5+ #0 [ 151.508857][T11774] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 151.518886][T11774] Call Trace: [ 151.522154][T11774] dump_stack+0x191/0x1f0 [ 151.526463][T11774] panic+0x3c9/0xc1e [ 151.530350][T11774] kmsan_report+0x215/0x220 [ 151.534832][T11774] __msan_warning+0x73/0xe0 [ 151.539311][T11774] kmem_cache_free+0x3df/0x2b70 [ 151.544139][T11774] ? kmsan_internal_set_origin+0x6a/0xb0 [ 151.549745][T11774] ? kfree_skb+0x473/0x4c0 [ 151.554139][T11774] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 151.560205][T11774] kfree_skb+0x473/0x4c0 [ 151.564437][T11774] ? packet_rcv_spkt+0x68d/0x7c0 [ 151.569354][T11774] packet_rcv_spkt+0x68d/0x7c0 [ 151.574099][T11774] ? packet_rcv+0x2110/0x2110 [ 151.578752][T11774] dev_queue_xmit_nit+0x1125/0x1200 [ 151.583940][T11774] dev_hard_start_xmit+0x21e/0xab0 [ 151.589034][T11774] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 151.594909][T11774] sch_direct_xmit+0x56c/0x18c0 [ 151.599748][T11774] __dev_queue_xmit+0x212d/0x4200 [ 151.604761][T11774] dev_queue_xmit+0x4b/0x60 [ 151.609242][T11774] ip_finish_output2+0x20d6/0x25d0 [ 151.614330][T11774] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 151.620373][T11774] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 151.626344][T11774] __ip_finish_output+0xaf8/0xda0 [ 151.631356][T11774] ip_finish_output+0x2db/0x420 [ 151.636188][T11774] ip_output+0x541/0x610 [ 151.640413][T11774] ? ip_mc_finish_output+0x6d0/0x6d0 [ 151.645690][T11774] ? ip_finish_output+0x420/0x420 [ 151.650693][T11774] __ip_queue_xmit+0x1caf/0x21f0 [ 151.655636][T11774] ip_queue_xmit+0xcc/0xf0 [ 151.660033][T11774] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 151.665652][T11774] __tcp_transmit_skb+0x40e3/0x5d90 [ 151.670849][T11774] __tcp_send_ack+0x701/0x840 [ 151.675506][T11774] tcp_send_ack+0x68/0x90 [ 151.679815][T11774] tcp_cleanup_rbuf+0x764/0x800 [ 151.684648][T11774] tcp_recvmsg+0x334d/0x4ff0 [ 151.689239][T11774] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 151.695109][T11774] ? tcp_mmap+0x150/0x150 [ 151.699412][T11774] ? tcp_mmap+0x150/0x150 [ 151.703730][T11774] inet_recvmsg+0x237/0x7d0 [ 151.708212][T11774] ? inet_sendpage+0x2c0/0x2c0 [ 151.712966][T11774] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 151.718833][T11774] ? inet_sendpage+0x2c0/0x2c0 [ 151.723575][T11774] ? inet_sendpage+0x2c0/0x2c0 [ 151.728316][T11774] sock_read_iter+0x5be/0x660 [ 151.732984][T11774] ? kernel_sock_ip_overhead+0x340/0x340 [ 151.738594][T11774] __vfs_read+0xa67/0xc90 [ 151.742914][T11774] vfs_read+0x359/0x6f0 [ 151.747071][T11774] ksys_read+0x265/0x430 [ 151.751301][T11774] __se_sys_read+0x92/0xb0 [ 151.755698][T11774] __x64_sys_read+0x4a/0x70 [ 151.760182][T11774] do_syscall_64+0xb6/0x160 [ 151.764668][T11774] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 151.770537][T11774] RIP: 0033:0x47fd44 [ 151.774410][T11774] 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 [ 151.793991][T11774] RSP: 002b:000000c4203c7760 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 151.802377][T11774] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 151.810329][T11774] RDX: 0000000000001000 RSI: 000000c420398000 RDI: 0000000000000003 [ 151.818288][T11774] RBP: 000000c4203c77b0 R08: 0000000000000000 R09: 0000000000000000 [ 151.826252][T11774] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010 [ 151.834206][T11774] R13: 0000000000000010 R14: 0000000000000020 R15: ffffffffffffffff [ 151.843719][T11774] Kernel Offset: disabled [ 151.848117][T11774] Rebooting in 86400 seconds..