[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 109.031823][ T32] audit: type=1800 audit(1565813192.085:25): pid=12348 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 109.058246][ T32] audit: type=1800 audit(1565813192.115:26): pid=12348 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 109.101211][ T32] audit: type=1800 audit(1565813192.145:27): pid=12348 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 '10.128.0.202' (ECDSA) to the list of known hosts. 2019/08/14 20:06:45 fuzzer started 2019/08/14 20:06:51 dialing manager at 10.128.0.26:45075 2019/08/14 20:06:52 syscalls: 2374 2019/08/14 20:06:52 code coverage: enabled 2019/08/14 20:06:52 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/08/14 20:06:52 extra coverage: enabled 2019/08/14 20:06:52 setuid sandbox: enabled 2019/08/14 20:06:52 namespace sandbox: enabled 2019/08/14 20:06:52 Android sandbox: /sys/fs/selinux/policy does not exist 2019/08/14 20:06:52 fault injection: enabled 2019/08/14 20:06:52 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/08/14 20:06:52 net packet injection: enabled 2019/08/14 20:06:52 net device setup: enabled syzkaller login: [ 270.624483][T12496] ================================================================== [ 270.632653][T12496] BUG: KMSAN: uninit-value in kmem_cache_free+0x3df/0x2b70 [ 270.641109][T12496] CPU: 1 PID: 12496 Comm: syz-fuzzer Not tainted 5.3.0-rc3+ #17 [ 270.650001][T12496] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 270.660836][T12496] Call Trace: [ 270.664476][T12496] dump_stack+0x191/0x1f0 [ 270.669080][T12496] kmsan_report+0x162/0x2d0 [ 270.673741][T12496] __msan_warning+0x75/0xe0 [ 270.678837][T12496] kmem_cache_free+0x3df/0x2b70 [ 270.685431][T12496] ? kfree_skb+0x473/0x4c0 [ 270.690243][T12496] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 270.696955][T12496] kfree_skb+0x473/0x4c0 [ 270.701626][T12496] ? packet_rcv_spkt+0x719/0x840 [ 270.706847][T12496] packet_rcv_spkt+0x719/0x840 [ 270.712256][T12496] ? packet_rcv+0x2190/0x2190 [ 270.717508][T12496] dev_queue_xmit_nit+0x1125/0x1200 [ 270.722787][T12496] ? bcma_sprom_get+0x4a4a/0x68a0 [ 270.727831][T12496] dev_hard_start_xmit+0x21e/0xab0 [ 270.732976][T12496] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 270.739381][T12496] sch_direct_xmit+0x56c/0x18c0 [ 270.744524][T12496] ? kmsan_set_origin+0x26d/0x340 [ 270.750198][T12496] __dev_queue_xmit+0x1e53/0x4270 [ 270.755277][T12496] dev_queue_xmit+0x4b/0x60 [ 270.759932][T12496] ip_finish_output2+0x20c6/0x25d0 [ 270.765779][T12496] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 270.772033][T12496] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 270.778247][T12496] __ip_finish_output+0xaf8/0xda0 [ 270.785221][T12496] ip_finish_output+0x2db/0x420 [ 270.790095][T12496] ip_output+0x541/0x610 [ 270.794365][T12496] ? ip_mc_finish_output+0x6d0/0x6d0 [ 270.799662][T12496] ? ip_finish_output+0x420/0x420 [ 270.804873][T12496] __ip_queue_xmit+0x1caf/0x21f0 [ 270.809913][T12496] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 270.815905][T12496] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 270.821983][T12496] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 270.828081][T12496] ip_queue_xmit+0xcc/0xf0 [ 270.832548][T12496] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 270.845166][T12496] __tcp_transmit_skb+0x409e/0x5c60 [ 270.851369][T12496] __tcp_send_ack+0x701/0x840 [ 270.856058][T12496] tcp_send_ack+0x68/0x90 [ 270.860391][T12496] tcp_cleanup_rbuf+0x764/0x800 [ 270.873002][T12496] tcp_recvmsg+0x334d/0x4ff0 [ 270.877656][T12496] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 270.883632][T12496] ? tcp_mmap+0x150/0x150 [ 270.888058][T12496] ? tcp_mmap+0x150/0x150 [ 270.892408][T12496] inet_recvmsg+0x237/0x7d0 [ 270.896916][T12496] ? inet_sendpage+0x2c0/0x2c0 [ 270.901682][T12496] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 270.907771][T12496] ? inet_sendpage+0x2c0/0x2c0 [ 270.912711][T12496] ? inet_sendpage+0x2c0/0x2c0 [ 270.917570][T12496] sock_read_iter+0x5be/0x660 [ 270.922835][T12496] ? kernel_sock_ip_overhead+0x340/0x340 [ 270.928479][T12496] __vfs_read+0xa67/0xc90 [ 270.932841][T12496] vfs_read+0x359/0x6f0 [ 270.937016][T12496] ksys_read+0x265/0x430 [ 270.941282][T12496] __se_sys_read+0x92/0xb0 [ 270.945711][T12496] __x64_sys_read+0x4a/0x70 [ 270.950230][T12496] do_syscall_64+0xbc/0xf0 [ 270.954714][T12496] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 270.960713][T12496] RIP: 0033:0x47fcb4 [ 270.964620][T12496] Code: ff ff cc cc cc cc e8 2b 41 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 [ 270.984225][T12496] RSP: 002b:000000c42034f710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 270.992666][T12496] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcb4 [ 271.000638][T12496] RDX: 0000000000001000 RSI: 000000c4203fc000 RDI: 0000000000000003 [ 271.008604][T12496] RBP: 000000c42034f760 R08: 0000000000000000 R09: 0000000000000000 [ 271.016674][T12496] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 271.024731][T12496] R13: 0000000000000008 R14: 0000000000000040 R15: ffffffffffffffff [ 271.032715][T12496] [ 271.035036][T12496] Uninit was stored to memory at: [ 271.040141][T12496] kmsan_internal_chain_origin+0xcc/0x150 [ 271.045867][T12496] __msan_chain_origin+0x6b/0xe0 [ 271.050903][T12496] ___slab_alloc+0x1dbc/0x1fb0 [ 271.055770][T12496] kmem_cache_alloc+0xade/0xd10 [ 271.061918][T12496] skb_clone+0x326/0x5d0 [ 271.066597][T12496] dev_queue_xmit_nit+0x539/0x1200 [ 271.072233][T12496] dev_hard_start_xmit+0x21e/0xab0 [ 271.077533][T12496] sch_direct_xmit+0x56c/0x18c0 [ 271.082385][T12496] __dev_queue_xmit+0x1e53/0x4270 [ 271.087928][T12496] dev_queue_xmit+0x4b/0x60 [ 271.092437][T12496] ip_finish_output2+0x20c6/0x25d0 [ 271.097549][T12496] __ip_finish_output+0xaf8/0xda0 [ 271.102557][T12496] ip_finish_output+0x2db/0x420 [ 271.107390][T12496] ip_output+0x541/0x610 [ 271.111614][T12496] __ip_queue_xmit+0x1caf/0x21f0 [ 271.119151][T12496] ip_queue_xmit+0xcc/0xf0 [ 271.123812][T12496] __tcp_transmit_skb+0x409e/0x5c60 [ 271.128990][T12496] __tcp_send_ack+0x701/0x840 [ 271.133646][T12496] tcp_send_ack+0x68/0x90 [ 271.137954][T12496] tcp_cleanup_rbuf+0x764/0x800 [ 271.142786][T12496] tcp_recvmsg+0x334d/0x4ff0 [ 271.147357][T12496] inet_recvmsg+0x237/0x7d0 [ 271.151843][T12496] sock_read_iter+0x5be/0x660 [ 271.156503][T12496] __vfs_read+0xa67/0xc90 [ 271.160817][T12496] vfs_read+0x359/0x6f0 [ 271.164954][T12496] ksys_read+0x265/0x430 [ 271.169177][T12496] __se_sys_read+0x92/0xb0 [ 271.173572][T12496] __x64_sys_read+0x4a/0x70 [ 271.178055][T12496] do_syscall_64+0xbc/0xf0 [ 271.182481][T12496] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 271.188351][T12496] [ 271.190680][T12496] Uninit was created at: [ 271.194909][T12496] kmsan_internal_poison_shadow+0x53/0xa0 [ 271.200697][T12496] kmsan_slab_free+0x8d/0x100 [ 271.205807][T12496] kmem_cache_free_bulk+0x3ad9/0x3f50 [ 271.211169][T12496] __kfree_skb_flush+0xb0/0x100 [ 271.216023][T12496] net_rx_action+0x1908/0x1950 [ 271.220778][T12496] __do_softirq+0x4a1/0x83a [ 271.225388][T12496] do_softirq_own_stack+0x49/0x80 [ 271.230417][T12496] __local_bh_enable_ip+0x184/0x1d0 [ 271.235669][T12496] local_bh_enable+0x36/0x40 [ 271.240282][T12496] ipt_do_table+0x2806/0x28e0 [ 271.245045][T12496] iptable_security_hook+0xb5/0xe0 [ 271.250176][T12496] nf_hook_slow+0x18b/0x3f0 [ 271.254676][T12496] __ip_local_out+0x69b/0x800 [ 271.259333][T12496] __ip_queue_xmit+0x1bdc/0x21f0 [ 271.264248][T12496] ip_queue_xmit+0xcc/0xf0 [ 271.268676][T12496] __tcp_transmit_skb+0x409e/0x5c60 [ 271.273870][T12496] __tcp_send_ack+0x701/0x840 [ 271.278546][T12496] tcp_send_ack+0x68/0x90 [ 271.282878][T12496] tcp_cleanup_rbuf+0x764/0x800 [ 271.287734][T12496] tcp_recvmsg+0x334d/0x4ff0 [ 271.292679][T12496] inet_recvmsg+0x237/0x7d0 [ 271.297177][T12496] sock_read_iter+0x5be/0x660 [ 271.301933][T12496] __vfs_read+0xa67/0xc90 [ 271.306432][T12496] vfs_read+0x359/0x6f0 [ 271.310580][T12496] ksys_read+0x265/0x430 [ 271.314816][T12496] __se_sys_read+0x92/0xb0 [ 271.319225][T12496] __x64_sys_read+0x4a/0x70 [ 271.323715][T12496] do_syscall_64+0xbc/0xf0 [ 271.328136][T12496] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 271.334016][T12496] ================================================================== [ 271.342057][T12496] Disabling lock debugging due to kernel taint [ 271.348210][T12496] Kernel panic - not syncing: panic_on_warn set ... [ 271.354806][T12496] CPU: 1 PID: 12496 Comm: syz-fuzzer Tainted: G B 5.3.0-rc3+ #17 [ 271.363896][T12496] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 271.373939][T12496] Call Trace: [ 271.377316][T12496] dump_stack+0x191/0x1f0 [ 271.381644][T12496] panic+0x3c9/0xc1e [ 271.385559][T12496] kmsan_report+0x2ca/0x2d0 [ 271.390066][T12496] __msan_warning+0x75/0xe0 [ 271.394569][T12496] kmem_cache_free+0x3df/0x2b70 [ 271.399434][T12496] ? kfree_skb+0x473/0x4c0 [ 271.403848][T12496] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 271.409976][T12496] kfree_skb+0x473/0x4c0 [ 271.414224][T12496] ? packet_rcv_spkt+0x719/0x840 [ 271.419166][T12496] packet_rcv_spkt+0x719/0x840 [ 271.423937][T12496] ? packet_rcv+0x2190/0x2190 [ 271.428605][T12496] dev_queue_xmit_nit+0x1125/0x1200 [ 271.433820][T12496] ? bcma_sprom_get+0x4a4a/0x68a0 [ 271.439027][T12496] dev_hard_start_xmit+0x21e/0xab0 [ 271.444151][T12496] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 271.450133][T12496] sch_direct_xmit+0x56c/0x18c0 [ 271.454973][T12496] ? kmsan_set_origin+0x26d/0x340 [ 271.460037][T12496] __dev_queue_xmit+0x1e53/0x4270 [ 271.465489][T12496] dev_queue_xmit+0x4b/0x60 [ 271.469992][T12496] ip_finish_output2+0x20c6/0x25d0 [ 271.475103][T12496] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 271.481172][T12496] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 271.487180][T12496] __ip_finish_output+0xaf8/0xda0 [ 271.492253][T12496] ip_finish_output+0x2db/0x420 [ 271.497138][T12496] ip_output+0x541/0x610 [ 271.501388][T12496] ? ip_mc_finish_output+0x6d0/0x6d0 [ 271.506785][T12496] ? ip_finish_output+0x420/0x420 [ 271.511821][T12496] __ip_queue_xmit+0x1caf/0x21f0 [ 271.516770][T12496] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 271.522752][T12496] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 271.528814][T12496] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 271.535011][T12496] ip_queue_xmit+0xcc/0xf0 [ 271.540318][T12496] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 271.546300][T12496] __tcp_transmit_skb+0x409e/0x5c60 [ 271.551553][T12496] __tcp_send_ack+0x701/0x840 [ 271.556238][T12496] tcp_send_ack+0x68/0x90 [ 271.560604][T12496] tcp_cleanup_rbuf+0x764/0x800 [ 271.566120][T12496] tcp_recvmsg+0x334d/0x4ff0 [ 271.570766][T12496] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 271.577678][T12496] ? tcp_mmap+0x150/0x150 [ 271.587142][T12496] ? tcp_mmap+0x150/0x150 [ 271.591486][T12496] inet_recvmsg+0x237/0x7d0 [ 271.595998][T12496] ? inet_sendpage+0x2c0/0x2c0 [ 271.600782][T12496] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 271.606759][T12496] ? inet_sendpage+0x2c0/0x2c0 [ 271.611963][T12496] ? inet_sendpage+0x2c0/0x2c0 [ 271.616728][T12496] sock_read_iter+0x5be/0x660 [ 271.621444][T12496] ? kernel_sock_ip_overhead+0x340/0x340 [ 271.627080][T12496] __vfs_read+0xa67/0xc90 [ 271.631458][T12496] vfs_read+0x359/0x6f0 [ 271.635646][T12496] ksys_read+0x265/0x430 [ 271.639899][T12496] __se_sys_read+0x92/0xb0 [ 271.644356][T12496] __x64_sys_read+0x4a/0x70 [ 271.649405][T12496] do_syscall_64+0xbc/0xf0 [ 271.654099][T12496] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 271.660078][T12496] RIP: 0033:0x47fcb4 [ 271.663965][T12496] Code: ff ff cc cc cc cc e8 2b 41 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 [ 271.685685][T12496] RSP: 002b:000000c42034f710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 271.694098][T12496] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcb4 [ 271.702056][T12496] RDX: 0000000000001000 RSI: 000000c4203fc000 RDI: 0000000000000003 [ 271.710011][T12496] RBP: 000000c42034f760 R08: 0000000000000000 R09: 0000000000000000 [ 271.717967][T12496] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 271.725924][T12496] R13: 0000000000000008 R14: 0000000000000040 R15: ffffffffffffffff [ 271.735051][T12496] Kernel Offset: disabled [ 271.739383][T12496] Rebooting in 86400 seconds..