[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 86.808888][ T32] audit: type=1800 audit(1573496800.858:25): pid=12448 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 86.842297][ T32] audit: type=1800 audit(1573496800.888:26): pid=12448 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 86.862664][ T32] audit: type=1800 audit(1573496800.888:27): pid=12448 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 '10.128.15.197' (ECDSA) to the list of known hosts. 2019/11/11 18:26:54 fuzzer started 2019/11/11 18:26:59 dialing manager at 10.128.0.26:44229 2019/11/11 18:26:59 syscalls: 2397 2019/11/11 18:26:59 code coverage: enabled 2019/11/11 18:26:59 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/11/11 18:26:59 extra coverage: enabled 2019/11/11 18:26:59 setuid sandbox: enabled 2019/11/11 18:26:59 namespace sandbox: enabled 2019/11/11 18:26:59 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/11 18:26:59 fault injection: enabled 2019/11/11 18:26:59 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/11 18:26:59 net packet injection: enabled 2019/11/11 18:26:59 net device setup: enabled 2019/11/11 18:26:59 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2019/11/11 18:26:59 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 199.555800][T12599] ===================================================== [ 199.562798][T12599] BUG: KMSAN: use-after-free in kmem_cache_free+0x3df/0x2b70 [ 199.570170][T12599] CPU: 0 PID: 12599 Comm: syz-fuzzer Not tainted 5.4.0-rc5+ #0 [ 199.577752][T12599] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 199.587786][T12599] Call Trace: [ 199.591112][T12599] dump_stack+0x191/0x1f0 [ 199.595427][T12599] kmsan_report+0x128/0x220 [ 199.599941][T12599] __msan_warning+0x73/0xe0 [ 199.604432][T12599] kmem_cache_free+0x3df/0x2b70 [ 199.609259][T12599] ? kmsan_internal_set_origin+0x6a/0xb0 [ 199.615598][T12599] ? kfree_skb+0x473/0x4c0 [ 199.620015][T12599] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 199.626068][T12599] kfree_skb+0x473/0x4c0 [ 199.630296][T12599] ? packet_rcv_spkt+0x68d/0x7c0 [ 199.635215][T12599] packet_rcv_spkt+0x68d/0x7c0 [ 199.639965][T12599] ? packet_rcv+0x2110/0x2110 [ 199.644616][T12599] dev_queue_xmit_nit+0x1125/0x1200 [ 199.649803][T12599] dev_hard_start_xmit+0x21e/0xab0 [ 199.654898][T12599] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 199.660769][T12599] sch_direct_xmit+0x56c/0x18c0 [ 199.665608][T12599] __dev_queue_xmit+0x212d/0x4200 [ 199.670622][T12599] dev_queue_xmit+0x4b/0x60 [ 199.675105][T12599] ip_finish_output2+0x20d6/0x25d0 [ 199.680194][T12599] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 199.686235][T12599] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 199.692203][T12599] __ip_finish_output+0xaf8/0xda0 [ 199.697311][T12599] ip_finish_output+0x2db/0x420 [ 199.702145][T12599] ip_output+0x541/0x610 [ 199.706370][T12599] ? ip_mc_finish_output+0x6d0/0x6d0 [ 199.711649][T12599] ? ip_finish_output+0x420/0x420 [ 199.716661][T12599] __ip_queue_xmit+0x1caf/0x21f0 [ 199.721592][T12599] ip_queue_xmit+0xcc/0xf0 [ 199.725989][T12599] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 199.731605][T12599] __tcp_transmit_skb+0x40e3/0x5d90 [ 199.736798][T12599] __tcp_send_ack+0x701/0x840 [ 199.741456][T12599] tcp_send_ack+0x68/0x90 [ 199.745765][T12599] tcp_cleanup_rbuf+0x764/0x800 [ 199.750597][T12599] tcp_recvmsg+0x334d/0x4ff0 [ 199.755194][T12599] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 199.761063][T12599] ? tcp_mmap+0x150/0x150 [ 199.765376][T12599] ? tcp_mmap+0x150/0x150 [ 199.769679][T12599] inet_recvmsg+0x237/0x7d0 [ 199.774170][T12599] ? inet_sendpage+0x2c0/0x2c0 [ 199.778910][T12599] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 199.784776][T12599] ? inet_sendpage+0x2c0/0x2c0 [ 199.789535][T12599] ? inet_sendpage+0x2c0/0x2c0 [ 199.794276][T12599] sock_read_iter+0x5be/0x660 [ 199.798946][T12599] ? kernel_sock_ip_overhead+0x340/0x340 [ 199.804568][T12599] __vfs_read+0xa67/0xc90 [ 199.808900][T12599] vfs_read+0x359/0x6f0 [ 199.813055][T12599] ksys_read+0x265/0x430 [ 199.817298][T12599] __se_sys_read+0x92/0xb0 [ 199.821700][T12599] __x64_sys_read+0x4a/0x70 [ 199.826211][T12599] do_syscall_64+0xb6/0x160 [ 199.830702][T12599] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 199.836575][T12599] RIP: 0033:0x47fd44 [ 199.840455][T12599] 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 [ 199.860651][T12599] RSP: 002b:000000c4203a2760 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 199.869042][T12599] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 199.876990][T12599] RDX: 0000000000001000 RSI: 000000c4202d0000 RDI: 0000000000000003 [ 199.884953][T12599] RBP: 000000c4203a27b0 R08: 0000000000000000 R09: 0000000000000000 [ 199.892933][T12599] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 199.900906][T12599] R13: 0000000000000004 R14: 0000000000000002 R15: ffffffffffffffff [ 199.908862][T12599] [ 199.911175][T12599] Uninit was stored to memory at: [ 199.916181][T12599] kmsan_internal_chain_origin+0xbd/0x180 [ 199.921884][T12599] __msan_chain_origin+0x6b/0xd0 [ 199.926795][T12599] ___slab_alloc+0x1dbc/0x1fb0 [ 199.931532][T12599] kmem_cache_alloc+0xadf/0xd20 [ 199.936362][T12599] skb_clone+0x326/0x5d0 [ 199.940593][T12599] dev_queue_xmit_nit+0x539/0x1200 [ 199.945679][T12599] dev_hard_start_xmit+0x21e/0xab0 [ 199.950762][T12599] sch_direct_xmit+0x56c/0x18c0 [ 199.955588][T12599] __dev_queue_xmit+0x212d/0x4200 [ 199.960595][T12599] dev_queue_xmit+0x4b/0x60 [ 199.965073][T12599] ip_finish_output2+0x20d6/0x25d0 [ 199.970168][T12599] __ip_finish_output+0xaf8/0xda0 [ 199.975180][T12599] ip_finish_output+0x2db/0x420 [ 199.980017][T12599] ip_output+0x541/0x610 [ 199.984244][T12599] __ip_queue_xmit+0x1caf/0x21f0 [ 199.989160][T12599] ip_queue_xmit+0xcc/0xf0 [ 199.993555][T12599] __tcp_transmit_skb+0x40e3/0x5d90 [ 199.998729][T12599] __tcp_send_ack+0x701/0x840 [ 200.003382][T12599] tcp_send_ack+0x68/0x90 [ 200.007684][T12599] tcp_cleanup_rbuf+0x764/0x800 [ 200.012511][T12599] tcp_recvmsg+0x334d/0x4ff0 [ 200.017081][T12599] inet_recvmsg+0x237/0x7d0 [ 200.021560][T12599] sock_read_iter+0x5be/0x660 [ 200.026210][T12599] __vfs_read+0xa67/0xc90 [ 200.030527][T12599] vfs_read+0x359/0x6f0 [ 200.034656][T12599] ksys_read+0x265/0x430 [ 200.038872][T12599] __se_sys_read+0x92/0xb0 [ 200.043258][T12599] __x64_sys_read+0x4a/0x70 [ 200.047781][T12599] do_syscall_64+0xb6/0x160 [ 200.052262][T12599] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 200.058124][T12599] [ 200.060423][T12599] Uninit was created at: [ 200.064641][T12599] kmsan_internal_poison_shadow+0x60/0x120 [ 200.070420][T12599] kmsan_slab_free+0x8d/0xf0 [ 200.074983][T12599] kmem_cache_free_bulk+0x3ad9/0x3f10 [ 200.080327][T12599] __kfree_skb_flush+0xb0/0x100 [ 200.085151][T12599] net_rx_action+0x1a5e/0x1aa0 [ 200.089887][T12599] __do_softirq+0x4a1/0x83a [ 200.094367][T12599] irq_exit+0x230/0x280 [ 200.098521][T12599] do_IRQ+0x123/0x360 [ 200.102477][T12599] ret_from_intr+0x0/0x33 [ 200.106781][T12599] ===================================================== [ 200.113685][T12599] Disabling lock debugging due to kernel taint [ 200.119828][T12599] Kernel panic - not syncing: panic_on_warn set ... [ 200.126393][T12599] CPU: 0 PID: 12599 Comm: syz-fuzzer Tainted: G B 5.4.0-rc5+ #0 [ 200.135301][T12599] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 200.145330][T12599] Call Trace: [ 200.148601][T12599] dump_stack+0x191/0x1f0 [ 200.152911][T12599] panic+0x3c9/0xc1e [ 200.156797][T12599] kmsan_report+0x215/0x220 [ 200.161282][T12599] __msan_warning+0x73/0xe0 [ 200.165763][T12599] kmem_cache_free+0x3df/0x2b70 [ 200.170693][T12599] ? kmsan_internal_set_origin+0x6a/0xb0 [ 200.176323][T12599] ? kfree_skb+0x473/0x4c0 [ 200.181251][T12599] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 200.187312][T12599] kfree_skb+0x473/0x4c0 [ 200.191544][T12599] ? packet_rcv_spkt+0x68d/0x7c0 [ 200.196479][T12599] packet_rcv_spkt+0x68d/0x7c0 [ 200.201224][T12599] ? packet_rcv+0x2110/0x2110 [ 200.205896][T12599] dev_queue_xmit_nit+0x1125/0x1200 [ 200.211083][T12599] dev_hard_start_xmit+0x21e/0xab0 [ 200.216178][T12599] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 200.222062][T12599] sch_direct_xmit+0x56c/0x18c0 [ 200.226901][T12599] __dev_queue_xmit+0x212d/0x4200 [ 200.231917][T12599] dev_queue_xmit+0x4b/0x60 [ 200.236401][T12599] ip_finish_output2+0x20d6/0x25d0 [ 200.241489][T12599] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 200.247530][T12599] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 200.253599][T12599] __ip_finish_output+0xaf8/0xda0 [ 200.258607][T12599] ip_finish_output+0x2db/0x420 [ 200.263438][T12599] ip_output+0x541/0x610 [ 200.267663][T12599] ? ip_mc_finish_output+0x6d0/0x6d0 [ 200.272926][T12599] ? ip_finish_output+0x420/0x420 [ 200.277938][T12599] __ip_queue_xmit+0x1caf/0x21f0 [ 200.282868][T12599] ip_queue_xmit+0xcc/0xf0 [ 200.287263][T12599] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 200.292873][T12599] __tcp_transmit_skb+0x40e3/0x5d90 [ 200.298068][T12599] __tcp_send_ack+0x701/0x840 [ 200.302726][T12599] tcp_send_ack+0x68/0x90 [ 200.307032][T12599] tcp_cleanup_rbuf+0x764/0x800 [ 200.311952][T12599] tcp_recvmsg+0x334d/0x4ff0 [ 200.316550][T12599] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 200.322423][T12599] ? tcp_mmap+0x150/0x150 [ 200.326784][T12599] ? tcp_mmap+0x150/0x150 [ 200.331102][T12599] inet_recvmsg+0x237/0x7d0 [ 200.335694][T12599] ? inet_sendpage+0x2c0/0x2c0 [ 200.340456][T12599] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 200.346340][T12599] ? inet_sendpage+0x2c0/0x2c0 [ 200.351089][T12599] ? inet_sendpage+0x2c0/0x2c0 [ 200.355834][T12599] sock_read_iter+0x5be/0x660 [ 200.360507][T12599] ? kernel_sock_ip_overhead+0x340/0x340 [ 200.366116][T12599] __vfs_read+0xa67/0xc90 [ 200.370434][T12599] vfs_read+0x359/0x6f0 [ 200.374585][T12599] ksys_read+0x265/0x430 [ 200.378811][T12599] __se_sys_read+0x92/0xb0 [ 200.383208][T12599] __x64_sys_read+0x4a/0x70 [ 200.387690][T12599] do_syscall_64+0xb6/0x160 [ 200.392172][T12599] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 200.398039][T12599] RIP: 0033:0x47fd44 [ 200.401922][T12599] 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 [ 200.421512][T12599] RSP: 002b:000000c4203a2760 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 200.429924][T12599] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 200.437967][T12599] RDX: 0000000000001000 RSI: 000000c4202d0000 RDI: 0000000000000003 [ 200.445913][T12599] RBP: 000000c4203a27b0 R08: 0000000000000000 R09: 0000000000000000 [ 200.453862][T12599] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 200.461819][T12599] R13: 0000000000000004 R14: 0000000000000002 R15: ffffffffffffffff [ 200.471089][T12599] Kernel Offset: disabled [ 200.475411][T12599] Rebooting in 86400 seconds..