[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 82.221954][ T32] audit: type=1800 audit(1572131152.291:25): pid=11577 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 82.246272][ T32] audit: type=1800 audit(1572131152.321:26): pid=11577 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 82.282531][ T32] audit: type=1800 audit(1572131152.341:27): pid=11577 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 '10.128.1.44' (ECDSA) to the list of known hosts. 2019/10/26 23:06:08 fuzzer started 2019/10/26 23:06:13 dialing manager at 10.128.0.26:34985 2019/10/26 23:06:13 syscalls: 2424 2019/10/26 23:06:13 code coverage: enabled 2019/10/26 23:06:13 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/10/26 23:06:13 extra coverage: enabled 2019/10/26 23:06:13 setuid sandbox: enabled 2019/10/26 23:06:13 namespace sandbox: enabled 2019/10/26 23:06:13 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/26 23:06:13 fault injection: enabled 2019/10/26 23:06:13 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/26 23:06:13 net packet injection: enabled 2019/10/26 23:06:13 net device setup: enabled 2019/10/26 23:06:13 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist syzkaller login: [ 256.091125][T11740] ===================================================== [ 256.098276][T11740] BUG: KMSAN: use-after-free in kmem_cache_free+0x3df/0x2b70 [ 256.106829][T11740] CPU: 1 PID: 11740 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 256.114383][T11740] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 256.124554][T11740] Call Trace: [ 256.127868][T11740] dump_stack+0x191/0x1f0 [ 256.132330][T11740] kmsan_report+0x128/0x220 [ 256.136881][T11740] __msan_warning+0x73/0xe0 [ 256.141517][T11740] kmem_cache_free+0x3df/0x2b70 [ 256.147109][T11740] ? kmsan_internal_set_origin+0x6a/0xb0 [ 256.152878][T11740] ? kfree_skb+0x473/0x4c0 [ 256.157330][T11740] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 256.163442][T11740] kfree_skb+0x473/0x4c0 [ 256.167696][T11740] ? packet_rcv_spkt+0x68d/0x7c0 [ 256.172847][T11740] packet_rcv_spkt+0x68d/0x7c0 [ 256.177734][T11740] ? packet_rcv+0x2110/0x2110 [ 256.182427][T11740] dev_queue_xmit_nit+0x1125/0x1200 [ 256.187847][T11740] dev_hard_start_xmit+0x21e/0xab0 [ 256.193008][T11740] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 256.198927][T11740] sch_direct_xmit+0x56c/0x18c0 [ 256.203811][T11740] __dev_queue_xmit+0x212d/0x4200 [ 256.208913][T11740] dev_queue_xmit+0x4b/0x60 [ 256.213463][T11740] ip_finish_output2+0x20d6/0x25d0 [ 256.218726][T11740] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 256.224894][T11740] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 256.231096][T11740] __ip_finish_output+0xaf8/0xda0 [ 256.236125][T11740] ip_finish_output+0x2db/0x420 [ 256.240980][T11740] ip_output+0x541/0x610 [ 256.245223][T11740] ? ip_mc_finish_output+0x6d0/0x6d0 [ 256.250489][T11740] ? ip_finish_output+0x420/0x420 [ 256.255519][T11740] __ip_queue_xmit+0x1caf/0x21f0 [ 256.260454][T11740] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 256.266341][T11740] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 256.272583][T11740] ? should_fail+0x1d2/0xa50 [ 256.277638][T11740] ip_queue_xmit+0xcc/0xf0 [ 256.282470][T11740] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 256.288115][T11740] __tcp_transmit_skb+0x40e3/0x5d90 [ 256.293326][T11740] __tcp_send_ack+0x701/0x840 [ 256.297999][T11740] tcp_send_ack+0x68/0x90 [ 256.302321][T11740] tcp_cleanup_rbuf+0x764/0x800 [ 256.307172][T11740] tcp_recvmsg+0x334d/0x4ff0 [ 256.311875][T11740] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 256.317793][T11740] ? tcp_mmap+0x150/0x150 [ 256.322237][T11740] ? tcp_mmap+0x150/0x150 [ 256.326740][T11740] inet_recvmsg+0x237/0x7d0 [ 256.331275][T11740] ? inet_sendpage+0x2c0/0x2c0 [ 256.336264][T11740] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 256.342156][T11740] ? inet_sendpage+0x2c0/0x2c0 [ 256.347262][T11740] ? inet_sendpage+0x2c0/0x2c0 [ 256.352190][T11740] sock_read_iter+0x5be/0x660 [ 256.356867][T11740] ? kernel_sock_ip_overhead+0x340/0x340 [ 256.362824][T11740] __vfs_read+0xa67/0xc90 [ 256.367176][T11740] vfs_read+0x359/0x6f0 [ 256.371342][T11740] ksys_read+0x265/0x430 [ 256.375587][T11740] __se_sys_read+0x92/0xb0 [ 256.380923][T11740] __x64_sys_read+0x4a/0x70 [ 256.386032][T11740] do_syscall_64+0xb6/0x160 [ 256.390652][T11740] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 256.396631][T11740] RIP: 0033:0x47fd44 [ 256.400523][T11740] 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 [ 256.420124][T11740] RSP: 002b:000000c42039f710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 256.428524][T11740] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 256.436589][T11740] RDX: 0000000000001000 RSI: 000000c420352000 RDI: 0000000000000003 [ 256.444699][T11740] RBP: 000000c42039f760 R08: 0000000000000000 R09: 0000000000000000 [ 256.453558][T11740] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 256.462673][T11740] R13: 0000000000000008 R14: 0000000000000040 R15: ffffffffffffffff [ 256.470654][T11740] [ 256.472964][T11740] Uninit was stored to memory at: [ 256.478012][T11740] kmsan_internal_chain_origin+0xbd/0x180 [ 256.483757][T11740] __msan_chain_origin+0x6b/0xd0 [ 256.488767][T11740] ___slab_alloc+0x1dbc/0x1fb0 [ 256.493513][T11740] kmem_cache_alloc+0xade/0xd10 [ 256.498459][T11740] skb_clone+0x326/0x5d0 [ 256.502734][T11740] dev_queue_xmit_nit+0x539/0x1200 [ 256.507853][T11740] dev_hard_start_xmit+0x21e/0xab0 [ 256.512968][T11740] sch_direct_xmit+0x56c/0x18c0 [ 256.517997][T11740] __dev_queue_xmit+0x212d/0x4200 [ 256.523064][T11740] dev_queue_xmit+0x4b/0x60 [ 256.527636][T11740] ip_finish_output2+0x20d6/0x25d0 [ 256.533266][T11740] __ip_finish_output+0xaf8/0xda0 [ 256.538586][T11740] ip_finish_output+0x2db/0x420 [ 256.543529][T11740] ip_output+0x541/0x610 [ 256.547796][T11740] __ip_queue_xmit+0x1caf/0x21f0 [ 256.552736][T11740] ip_queue_xmit+0xcc/0xf0 [ 256.557246][T11740] __tcp_transmit_skb+0x40e3/0x5d90 [ 256.562440][T11740] __tcp_send_ack+0x701/0x840 [ 256.567123][T11740] tcp_send_ack+0x68/0x90 [ 256.571447][T11740] tcp_cleanup_rbuf+0x764/0x800 [ 256.576576][T11740] tcp_recvmsg+0x334d/0x4ff0 [ 256.581349][T11740] inet_recvmsg+0x237/0x7d0 [ 256.585860][T11740] sock_read_iter+0x5be/0x660 [ 256.590519][T11740] __vfs_read+0xa67/0xc90 [ 256.594827][T11740] vfs_read+0x359/0x6f0 [ 256.598959][T11740] ksys_read+0x265/0x430 [ 256.603175][T11740] __se_sys_read+0x92/0xb0 [ 256.607565][T11740] __x64_sys_read+0x4a/0x70 [ 256.612053][T11740] do_syscall_64+0xb6/0x160 [ 256.616781][T11740] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 256.623013][T11740] [ 256.626153][T11740] Uninit was created at: [ 256.630436][T11740] kmsan_internal_poison_shadow+0x60/0x120 [ 256.637146][T11740] kmsan_slab_free+0x8d/0xf0 [ 256.641728][T11740] kmem_cache_free_bulk+0x3ad9/0x3f10 [ 256.647214][T11740] __kfree_skb_flush+0xb0/0x100 [ 256.652245][T11740] net_rx_action+0x1a5e/0x1aa0 [ 256.657002][T11740] __do_softirq+0x4a1/0x83a [ 256.661490][T11740] irq_exit+0x230/0x280 [ 256.666116][T11740] do_IRQ+0x123/0x360 [ 256.670085][T11740] ret_from_intr+0x0/0x33 [ 256.674425][T11740] kmsan_get_shadow_origin_ptr+0x3c5/0x4b0 [ 256.680224][T11740] __msan_metadata_ptr_for_load_8+0x10/0x20 [ 256.686107][T11740] kmem_cache_free+0x476/0x2b70 [ 256.690974][T11740] __kfree_skb+0x1dd/0x210 [ 256.695407][T11740] tcp_recvmsg+0x27a6/0x4ff0 [ 256.699977][T11740] inet_recvmsg+0x237/0x7d0 [ 256.704463][T11740] sock_read_iter+0x5be/0x660 [ 256.709133][T11740] __vfs_read+0xa67/0xc90 [ 256.713757][T11740] vfs_read+0x359/0x6f0 [ 256.717920][T11740] ksys_read+0x265/0x430 [ 256.722162][T11740] __se_sys_read+0x92/0xb0 [ 256.726585][T11740] __x64_sys_read+0x4a/0x70 [ 256.731264][T11740] do_syscall_64+0xb6/0x160 [ 256.735803][T11740] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 256.741922][T11740] ===================================================== [ 256.748955][T11740] Disabling lock debugging due to kernel taint [ 256.755096][T11740] Kernel panic - not syncing: panic_on_warn set ... [ 256.761683][T11740] CPU: 1 PID: 11740 Comm: syz-fuzzer Tainted: G B 5.4.0-rc3+ #0 [ 256.770761][T11740] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 256.780850][T11740] Call Trace: [ 256.784149][T11740] dump_stack+0x191/0x1f0 [ 256.788477][T11740] panic+0x3c9/0xc1e [ 256.792485][T11740] kmsan_report+0x215/0x220 [ 256.797355][T11740] __msan_warning+0x73/0xe0 [ 256.801853][T11740] kmem_cache_free+0x3df/0x2b70 [ 256.807380][T11740] ? kmsan_internal_set_origin+0x6a/0xb0 [ 256.816543][T11740] ? kfree_skb+0x473/0x4c0 [ 256.821139][T11740] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 256.827756][T11740] kfree_skb+0x473/0x4c0 [ 256.832242][T11740] ? packet_rcv_spkt+0x68d/0x7c0 [ 256.837189][T11740] packet_rcv_spkt+0x68d/0x7c0 [ 256.842239][T11740] ? packet_rcv+0x2110/0x2110 [ 256.847120][T11740] dev_queue_xmit_nit+0x1125/0x1200 [ 256.852322][T11740] dev_hard_start_xmit+0x21e/0xab0 [ 256.858058][T11740] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 256.863971][T11740] sch_direct_xmit+0x56c/0x18c0 [ 256.868823][T11740] __dev_queue_xmit+0x212d/0x4200 [ 256.873875][T11740] dev_queue_xmit+0x4b/0x60 [ 256.878460][T11740] ip_finish_output2+0x20d6/0x25d0 [ 256.883566][T11740] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 256.889625][T11740] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 256.895613][T11740] __ip_finish_output+0xaf8/0xda0 [ 256.900850][T11740] ip_finish_output+0x2db/0x420 [ 256.905709][T11740] ip_output+0x541/0x610 [ 256.910037][T11740] ? ip_mc_finish_output+0x6d0/0x6d0 [ 256.915785][T11740] ? ip_finish_output+0x420/0x420 [ 256.920818][T11740] __ip_queue_xmit+0x1caf/0x21f0 [ 256.925768][T11740] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 256.931924][T11740] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 256.937977][T11740] ? should_fail+0x1d2/0xa50 [ 256.942563][T11740] ip_queue_xmit+0xcc/0xf0 [ 256.946969][T11740] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 256.952612][T11740] __tcp_transmit_skb+0x40e3/0x5d90 [ 256.957844][T11740] __tcp_send_ack+0x701/0x840 [ 256.962900][T11740] tcp_send_ack+0x68/0x90 [ 256.967227][T11740] tcp_cleanup_rbuf+0x764/0x800 [ 256.972075][T11740] tcp_recvmsg+0x334d/0x4ff0 [ 256.976861][T11740] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 256.983000][T11740] ? tcp_mmap+0x150/0x150 [ 256.987308][T11740] ? tcp_mmap+0x150/0x150 [ 256.991645][T11740] inet_recvmsg+0x237/0x7d0 [ 256.996263][T11740] ? inet_sendpage+0x2c0/0x2c0 [ 257.001039][T11740] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 257.006925][T11740] ? inet_sendpage+0x2c0/0x2c0 [ 257.011674][T11740] ? inet_sendpage+0x2c0/0x2c0 [ 257.016440][T11740] sock_read_iter+0x5be/0x660 [ 257.021240][T11740] ? kernel_sock_ip_overhead+0x340/0x340 [ 257.026864][T11740] __vfs_read+0xa67/0xc90 [ 257.031382][T11740] vfs_read+0x359/0x6f0 [ 257.035543][T11740] ksys_read+0x265/0x430 [ 257.039774][T11740] __se_sys_read+0x92/0xb0 [ 257.044744][T11740] __x64_sys_read+0x4a/0x70 [ 257.049239][T11740] do_syscall_64+0xb6/0x160 [ 257.053743][T11740] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 257.059628][T11740] RIP: 0033:0x47fd44 [ 257.063532][T11740] 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 [ 257.083316][T11740] RSP: 002b:000000c42039f710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 257.091768][T11740] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 257.100011][T11740] RDX: 0000000000001000 RSI: 000000c420352000 RDI: 0000000000000003 [ 257.108316][T11740] RBP: 000000c42039f760 R08: 0000000000000000 R09: 0000000000000000 [ 257.116395][T11740] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 257.124632][T11740] R13: 0000000000000008 R14: 0000000000000040 R15: ffffffffffffffff [ 257.134690][T11740] Kernel Offset: disabled [ 257.139174][T11740] Rebooting in 86400 seconds..