[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 84.502235][ T31] audit: type=1800 audit(1574114134.548:25): pid=12092 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 84.532799][ T31] audit: type=1800 audit(1574114134.578:26): pid=12092 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 84.553014][ T31] audit: type=1800 audit(1574114134.588:27): pid=12092 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 '10.128.0.168' (ECDSA) to the list of known hosts. 2019/11/18 21:55:50 fuzzer started 2019/11/18 21:55:55 dialing manager at 10.128.0.26:35589 2019/11/18 21:55:55 syscalls: 2397 2019/11/18 21:55:55 code coverage: enabled 2019/11/18 21:55:55 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/11/18 21:55:55 extra coverage: enabled 2019/11/18 21:55:55 setuid sandbox: enabled 2019/11/18 21:55:55 namespace sandbox: enabled 2019/11/18 21:55:55 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/18 21:55:55 fault injection: enabled 2019/11/18 21:55:55 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/18 21:55:55 net packet injection: enabled 2019/11/18 21:55:55 net device setup: enabled 2019/11/18 21:55:55 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2019/11/18 21:55:55 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 118.365751][T12253] ===================================================== [ 118.372771][T12253] BUG: KMSAN: use-after-free in kmem_cache_free+0x3df/0x2b70 [ 118.380142][T12253] CPU: 1 PID: 12253 Comm: syz-fuzzer Not tainted 5.4.0-rc5+ #0 [ 118.387683][T12253] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 118.397740][T12253] Call Trace: [ 118.401052][T12253] dump_stack+0x191/0x1f0 [ 118.405426][T12253] kmsan_report+0x128/0x220 [ 118.409945][T12253] __msan_warning+0x73/0xe0 [ 118.414457][T12253] kmem_cache_free+0x3df/0x2b70 [ 118.419313][T12253] ? kmsan_internal_set_origin+0x6a/0xb0 [ 118.424951][T12253] ? kfree_skb+0x473/0x4c0 [ 118.429369][T12253] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 118.435460][T12253] kfree_skb+0x473/0x4c0 [ 118.439923][T12253] ? packet_rcv_spkt+0x68d/0x7c0 [ 118.444886][T12253] packet_rcv_spkt+0x68d/0x7c0 [ 118.449765][T12253] ? packet_rcv+0x2110/0x2110 [ 118.454533][T12253] dev_queue_xmit_nit+0x1125/0x1200 [ 118.459726][T12253] dev_hard_start_xmit+0x21e/0xab0 [ 118.464830][T12253] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 118.470713][T12253] sch_direct_xmit+0x56c/0x18c0 [ 118.475562][T12253] __dev_queue_xmit+0x212d/0x4200 [ 118.480640][T12253] dev_queue_xmit+0x4b/0x60 [ 118.485131][T12253] ip_finish_output2+0x20d6/0x25d0 [ 118.490261][T12253] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 118.496308][T12253] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 118.502328][T12253] __ip_finish_output+0xaf8/0xda0 [ 118.507354][T12253] ip_finish_output+0x2db/0x420 [ 118.512242][T12253] ip_output+0x541/0x610 [ 118.516478][T12253] ? ip_mc_finish_output+0x6d0/0x6d0 [ 118.521755][T12253] ? ip_finish_output+0x420/0x420 [ 118.526773][T12253] __ip_queue_xmit+0x1caf/0x21f0 [ 118.531700][T12253] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 118.537577][T12253] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 118.543718][T12253] ip_queue_xmit+0xcc/0xf0 [ 118.548114][T12253] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 118.553721][T12253] __tcp_transmit_skb+0x40e3/0x5d90 [ 118.558933][T12253] __tcp_send_ack+0x701/0x840 [ 118.563653][T12253] tcp_send_ack+0x68/0x90 [ 118.567979][T12253] tcp_cleanup_rbuf+0x764/0x800 [ 118.572837][T12253] tcp_recvmsg+0x334d/0x4ff0 [ 118.577540][T12253] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 118.583421][T12253] ? tcp_mmap+0x150/0x150 [ 118.587738][T12253] ? tcp_mmap+0x150/0x150 [ 118.592059][T12253] inet_recvmsg+0x237/0x7d0 [ 118.596566][T12253] ? inet_sendpage+0x2c0/0x2c0 [ 118.601423][T12253] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 118.607418][T12253] ? inet_sendpage+0x2c0/0x2c0 [ 118.612282][T12253] ? inet_sendpage+0x2c0/0x2c0 [ 118.617072][T12253] sock_read_iter+0x5be/0x660 [ 118.621881][T12253] ? kernel_sock_ip_overhead+0x340/0x340 [ 118.627523][T12253] __vfs_read+0xa67/0xc90 [ 118.631864][T12253] vfs_read+0x359/0x6f0 [ 118.636021][T12253] ksys_read+0x265/0x430 [ 118.640294][T12253] __se_sys_read+0x92/0xb0 [ 118.644705][T12253] __x64_sys_read+0x4a/0x70 [ 118.649736][T12253] do_syscall_64+0xb6/0x160 [ 118.654251][T12253] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 118.660133][T12253] RIP: 0033:0x47fd44 [ 118.664015][T12253] 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 [ 118.683696][T12253] RSP: 002b:000000c4203c5710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 118.692195][T12253] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 118.700262][T12253] RDX: 0000000000001000 RSI: 000000c420368000 RDI: 0000000000000003 [ 118.708254][T12253] RBP: 000000c4203c5760 R08: 0000000000000000 R09: 0000000000000000 [ 118.716217][T12253] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010 [ 118.724177][T12253] R13: 0000000000000010 R14: 0000000000000020 R15: ffffffffffffffff [ 118.732203][T12253] [ 118.734527][T12253] Uninit was stored to memory at: [ 118.739581][T12253] kmsan_internal_chain_origin+0xbd/0x180 [ 118.745381][T12253] __msan_chain_origin+0x6b/0xd0 [ 118.750573][T12253] ___slab_alloc+0x1dbc/0x1fb0 [ 118.755338][T12253] kmem_cache_alloc+0xadf/0xd20 [ 118.760180][T12253] skb_clone+0x326/0x5d0 [ 118.764411][T12253] dev_queue_xmit_nit+0x539/0x1200 [ 118.769500][T12253] dev_hard_start_xmit+0x21e/0xab0 [ 118.774597][T12253] sch_direct_xmit+0x56c/0x18c0 [ 118.779422][T12253] __dev_queue_xmit+0x212d/0x4200 [ 118.784424][T12253] dev_queue_xmit+0x4b/0x60 [ 118.788976][T12253] ip_finish_output2+0x20d6/0x25d0 [ 118.794071][T12253] __ip_finish_output+0xaf8/0xda0 [ 118.799105][T12253] ip_finish_output+0x2db/0x420 [ 118.803944][T12253] ip_output+0x541/0x610 [ 118.808169][T12253] __ip_queue_xmit+0x1caf/0x21f0 [ 118.813096][T12253] ip_queue_xmit+0xcc/0xf0 [ 118.817509][T12253] __tcp_transmit_skb+0x40e3/0x5d90 [ 118.822694][T12253] __tcp_send_ack+0x701/0x840 [ 118.827392][T12253] tcp_send_ack+0x68/0x90 [ 118.831700][T12253] tcp_cleanup_rbuf+0x764/0x800 [ 118.836530][T12253] tcp_recvmsg+0x334d/0x4ff0 [ 118.841102][T12253] inet_recvmsg+0x237/0x7d0 [ 118.845583][T12253] sock_read_iter+0x5be/0x660 [ 118.850239][T12253] __vfs_read+0xa67/0xc90 [ 118.854545][T12253] vfs_read+0x359/0x6f0 [ 118.858673][T12253] ksys_read+0x265/0x430 [ 118.862890][T12253] __se_sys_read+0x92/0xb0 [ 118.867294][T12253] __x64_sys_read+0x4a/0x70 [ 118.871772][T12253] do_syscall_64+0xb6/0x160 [ 118.876252][T12253] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 118.882112][T12253] [ 118.884432][T12253] Uninit was created at: [ 118.888653][T12253] kmsan_internal_poison_shadow+0x60/0x120 [ 118.894520][T12253] kmsan_slab_free+0x8d/0xf0 [ 118.899086][T12253] kmem_cache_free_bulk+0x3ad9/0x3f10 [ 118.904434][T12253] __kfree_skb_flush+0xb0/0x100 [ 118.909264][T12253] net_rx_action+0x1a5e/0x1aa0 [ 118.914017][T12253] __do_softirq+0x4a1/0x83a [ 118.918495][T12253] do_softirq_own_stack+0x49/0x80 [ 118.923496][T12253] __local_bh_enable_ip+0x184/0x1d0 [ 118.928667][T12253] _raw_spin_unlock_bh+0x4b/0x60 [ 118.933584][T12253] __release_sock+0xdc/0x640 [ 118.938148][T12253] release_sock+0x99/0x2a0 [ 118.942548][T12253] tcp_recvmsg+0x335f/0x4ff0 [ 118.947117][T12253] inet_recvmsg+0x237/0x7d0 [ 118.951596][T12253] sock_read_iter+0x5be/0x660 [ 118.956262][T12253] __vfs_read+0xa67/0xc90 [ 118.960584][T12253] vfs_read+0x359/0x6f0 [ 118.964730][T12253] ksys_read+0x265/0x430 [ 118.968973][T12253] __se_sys_read+0x92/0xb0 [ 118.973383][T12253] __x64_sys_read+0x4a/0x70 [ 118.977867][T12253] do_syscall_64+0xb6/0x160 [ 118.982350][T12253] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 118.988216][T12253] ===================================================== [ 118.995122][T12253] Disabling lock debugging due to kernel taint [ 119.001250][T12253] Kernel panic - not syncing: panic_on_warn set ... [ 119.007831][T12253] CPU: 1 PID: 12253 Comm: syz-fuzzer Tainted: G B 5.4.0-rc5+ #0 [ 119.016764][T12253] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 119.026818][T12253] Call Trace: [ 119.030106][T12253] dump_stack+0x191/0x1f0 [ 119.034432][T12253] panic+0x3c9/0xc1e [ 119.038331][T12253] kmsan_report+0x215/0x220 [ 119.042831][T12253] __msan_warning+0x73/0xe0 [ 119.047316][T12253] kmem_cache_free+0x3df/0x2b70 [ 119.052150][T12253] ? kmsan_internal_set_origin+0x6a/0xb0 [ 119.057760][T12253] ? kfree_skb+0x473/0x4c0 [ 119.062158][T12253] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 119.068212][T12253] kfree_skb+0x473/0x4c0 [ 119.072446][T12253] ? packet_rcv_spkt+0x68d/0x7c0 [ 119.077363][T12253] packet_rcv_spkt+0x68d/0x7c0 [ 119.082108][T12253] ? packet_rcv+0x2110/0x2110 [ 119.086775][T12253] dev_queue_xmit_nit+0x1125/0x1200 [ 119.092039][T12253] dev_hard_start_xmit+0x21e/0xab0 [ 119.097216][T12253] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 119.103115][T12253] sch_direct_xmit+0x56c/0x18c0 [ 119.108013][T12253] __dev_queue_xmit+0x212d/0x4200 [ 119.113036][T12253] dev_queue_xmit+0x4b/0x60 [ 119.117635][T12253] ip_finish_output2+0x20d6/0x25d0 [ 119.122733][T12253] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 119.128796][T12253] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 119.134793][T12253] __ip_finish_output+0xaf8/0xda0 [ 119.139830][T12253] ip_finish_output+0x2db/0x420 [ 119.144686][T12253] ip_output+0x541/0x610 [ 119.148922][T12253] ? ip_mc_finish_output+0x6d0/0x6d0 [ 119.154188][T12253] ? ip_finish_output+0x420/0x420 [ 119.159207][T12253] __ip_queue_xmit+0x1caf/0x21f0 [ 119.164129][T12253] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 119.170004][T12253] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 119.176070][T12253] ip_queue_xmit+0xcc/0xf0 [ 119.180478][T12253] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 119.186090][T12253] __tcp_transmit_skb+0x40e3/0x5d90 [ 119.191288][T12253] __tcp_send_ack+0x701/0x840 [ 119.196101][T12253] tcp_send_ack+0x68/0x90 [ 119.200409][T12253] tcp_cleanup_rbuf+0x764/0x800 [ 119.205261][T12253] tcp_recvmsg+0x334d/0x4ff0 [ 119.209860][T12253] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 119.215729][T12253] ? tcp_mmap+0x150/0x150 [ 119.220038][T12253] ? tcp_mmap+0x150/0x150 [ 119.224343][T12253] inet_recvmsg+0x237/0x7d0 [ 119.228915][T12253] ? inet_sendpage+0x2c0/0x2c0 [ 119.233858][T12253] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 119.239730][T12253] ? inet_sendpage+0x2c0/0x2c0 [ 119.244477][T12253] ? inet_sendpage+0x2c0/0x2c0 [ 119.249238][T12253] sock_read_iter+0x5be/0x660 [ 119.253914][T12253] ? kernel_sock_ip_overhead+0x340/0x340 [ 119.259526][T12253] __vfs_read+0xa67/0xc90 [ 119.263845][T12253] vfs_read+0x359/0x6f0 [ 119.267984][T12253] ksys_read+0x265/0x430 [ 119.272215][T12253] __se_sys_read+0x92/0xb0 [ 119.276611][T12253] __x64_sys_read+0x4a/0x70 [ 119.281107][T12253] do_syscall_64+0xb6/0x160 [ 119.285764][T12253] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 119.291661][T12253] RIP: 0033:0x47fd44 [ 119.295535][T12253] 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 [ 119.315116][T12253] RSP: 002b:000000c4203c5710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 119.323502][T12253] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 119.331455][T12253] RDX: 0000000000001000 RSI: 000000c420368000 RDI: 0000000000000003 [ 119.339417][T12253] RBP: 000000c4203c5760 R08: 0000000000000000 R09: 0000000000000000 [ 119.347382][T12253] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010 [ 119.355338][T12253] R13: 0000000000000010 R14: 0000000000000020 R15: ffffffffffffffff [ 119.364704][T12253] Kernel Offset: disabled [ 119.369038][T12253] Rebooting in 86400 seconds..