[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 80.711304][ T32] audit: type=1800 audit(1573843568.771:25): pid=11416 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 80.735159][ T32] audit: type=1800 audit(1573843568.801:26): pid=11416 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 80.770016][ T32] audit: type=1800 audit(1573843568.821:27): pid=11416 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 '10.128.0.233' (ECDSA) to the list of known hosts. 2019/11/15 18:46:23 fuzzer started 2019/11/15 18:46:28 dialing manager at 10.128.0.26:43093 2019/11/15 18:46:28 syscalls: 2397 2019/11/15 18:46:28 code coverage: enabled 2019/11/15 18:46:28 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/11/15 18:46:28 extra coverage: enabled 2019/11/15 18:46:28 setuid sandbox: enabled 2019/11/15 18:46:28 namespace sandbox: enabled 2019/11/15 18:46:28 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/15 18:46:28 fault injection: enabled 2019/11/15 18:46:28 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/15 18:46:28 net packet injection: enabled 2019/11/15 18:46:28 net device setup: enabled 2019/11/15 18:46:28 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2019/11/15 18:46:28 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 139.182463][T11579] ===================================================== [ 139.189606][T11579] BUG: KMSAN: use-after-free in kmem_cache_free+0x3df/0x2b70 [ 139.196997][T11579] CPU: 1 PID: 11579 Comm: syz-fuzzer Not tainted 5.4.0-rc5+ #0 [ 139.204637][T11579] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 139.214711][T11579] Call Trace: [ 139.218041][T11579] dump_stack+0x191/0x1f0 [ 139.222409][T11579] kmsan_report+0x128/0x220 [ 139.226934][T11579] __msan_warning+0x73/0xe0 [ 139.231456][T11579] kmem_cache_free+0x3df/0x2b70 [ 139.236496][T11579] ? kmsan_internal_set_origin+0x6a/0xb0 [ 139.242138][T11579] ? kfree_skb+0x473/0x4c0 [ 139.246569][T11579] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 139.252659][T11579] kfree_skb+0x473/0x4c0 [ 139.256907][T11579] ? packet_rcv_spkt+0x68d/0x7c0 [ 139.261853][T11579] packet_rcv_spkt+0x68d/0x7c0 [ 139.266628][T11579] ? packet_rcv+0x2110/0x2110 [ 139.271306][T11579] dev_queue_xmit_nit+0x1125/0x1200 [ 139.276533][T11579] dev_hard_start_xmit+0x21e/0xab0 [ 139.281664][T11579] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 139.287557][T11579] sch_direct_xmit+0x56c/0x18c0 [ 139.292553][T11579] __dev_queue_xmit+0x212d/0x4200 [ 139.297578][T11579] dev_queue_xmit+0x4b/0x60 [ 139.302069][T11579] ip_finish_output2+0x20d6/0x25d0 [ 139.307161][T11579] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 139.313205][T11579] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 139.319175][T11579] __ip_finish_output+0xaf8/0xda0 [ 139.324211][T11579] ip_finish_output+0x2db/0x420 [ 139.329198][T11579] ip_output+0x541/0x610 [ 139.333455][T11579] ? ip_mc_finish_output+0x6d0/0x6d0 [ 139.338747][T11579] ? ip_finish_output+0x420/0x420 [ 139.343759][T11579] __ip_queue_xmit+0x1caf/0x21f0 [ 139.348704][T11579] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 139.354701][T11579] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 139.361134][T11579] ip_queue_xmit+0xcc/0xf0 [ 139.365546][T11579] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 139.371159][T11579] __tcp_transmit_skb+0x40e3/0x5d90 [ 139.376397][T11579] __tcp_send_ack+0x701/0x840 [ 139.381159][T11579] tcp_send_ack+0x68/0x90 [ 139.385636][T11579] tcp_cleanup_rbuf+0x764/0x800 [ 139.390480][T11579] tcp_recvmsg+0x334d/0x4ff0 [ 139.395099][T11579] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 139.400999][T11579] ? tcp_mmap+0x150/0x150 [ 139.405375][T11579] ? tcp_mmap+0x150/0x150 [ 139.409930][T11579] inet_recvmsg+0x237/0x7d0 [ 139.414443][T11579] ? inet_sendpage+0x2c0/0x2c0 [ 139.419205][T11579] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 139.425268][T11579] ? inet_sendpage+0x2c0/0x2c0 [ 139.430076][T11579] ? inet_sendpage+0x2c0/0x2c0 [ 139.434832][T11579] sock_read_iter+0x5be/0x660 [ 139.439519][T11579] ? kernel_sock_ip_overhead+0x340/0x340 [ 139.445144][T11579] __vfs_read+0xa67/0xc90 [ 139.449474][T11579] vfs_read+0x359/0x6f0 [ 139.453616][T11579] ksys_read+0x265/0x430 [ 139.457961][T11579] __se_sys_read+0x92/0xb0 [ 139.462378][T11579] __x64_sys_read+0x4a/0x70 [ 139.466993][T11579] do_syscall_64+0xb6/0x160 [ 139.471488][T11579] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 139.477360][T11579] RIP: 0033:0x47fd44 [ 139.481234][T11579] 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 [ 139.500941][T11579] RSP: 002b:000000c4202b5710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 139.509356][T11579] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 139.517424][T11579] RDX: 0000000000001000 RSI: 000000c4203c8000 RDI: 0000000000000003 [ 139.525396][T11579] RBP: 000000c4202b5760 R08: 0000000000000000 R09: 0000000000000000 [ 139.533354][T11579] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 139.541305][T11579] R13: 0000000000000008 R14: 0000000000000040 R15: ffffffffffffffff [ 139.549276][T11579] [ 139.551715][T11579] Uninit was stored to memory at: [ 139.556850][T11579] kmsan_internal_chain_origin+0xbd/0x180 [ 139.562573][T11579] __msan_chain_origin+0x6b/0xd0 [ 139.567532][T11579] ___slab_alloc+0x1dbc/0x1fb0 [ 139.572285][T11579] kmem_cache_alloc+0xadf/0xd20 [ 139.577137][T11579] skb_clone+0x326/0x5d0 [ 139.581636][T11579] dev_queue_xmit_nit+0x539/0x1200 [ 139.586752][T11579] dev_hard_start_xmit+0x21e/0xab0 [ 139.591977][T11579] sch_direct_xmit+0x56c/0x18c0 [ 139.597077][T11579] __dev_queue_xmit+0x212d/0x4200 [ 139.602151][T11579] dev_queue_xmit+0x4b/0x60 [ 139.606640][T11579] ip_finish_output2+0x20d6/0x25d0 [ 139.611731][T11579] __ip_finish_output+0xaf8/0xda0 [ 139.616734][T11579] ip_finish_output+0x2db/0x420 [ 139.621573][T11579] ip_output+0x541/0x610 [ 139.625790][T11579] __ip_queue_xmit+0x1caf/0x21f0 [ 139.630718][T11579] ip_queue_xmit+0xcc/0xf0 [ 139.635108][T11579] __tcp_transmit_skb+0x40e3/0x5d90 [ 139.640311][T11579] __tcp_send_ack+0x701/0x840 [ 139.644965][T11579] tcp_send_ack+0x68/0x90 [ 139.649272][T11579] tcp_cleanup_rbuf+0x764/0x800 [ 139.654108][T11579] tcp_recvmsg+0x334d/0x4ff0 [ 139.658674][T11579] inet_recvmsg+0x237/0x7d0 [ 139.663152][T11579] sock_read_iter+0x5be/0x660 [ 139.667801][T11579] __vfs_read+0xa67/0xc90 [ 139.672111][T11579] vfs_read+0x359/0x6f0 [ 139.676239][T11579] ksys_read+0x265/0x430 [ 139.680458][T11579] __se_sys_read+0x92/0xb0 [ 139.684854][T11579] __x64_sys_read+0x4a/0x70 [ 139.689336][T11579] do_syscall_64+0xb6/0x160 [ 139.693816][T11579] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 139.699677][T11579] [ 139.702088][T11579] Uninit was created at: [ 139.706307][T11579] kmsan_internal_poison_shadow+0x60/0x120 [ 139.712086][T11579] kmsan_slab_free+0x8d/0xf0 [ 139.716654][T11579] kmem_cache_free_bulk+0x3ad9/0x3f10 [ 139.722008][T11579] __kfree_skb_flush+0xb0/0x100 [ 139.726849][T11579] net_rx_action+0x1a5e/0x1aa0 [ 139.731600][T11579] __do_softirq+0x4a1/0x83a [ 139.736102][T11579] irq_exit+0x230/0x280 [ 139.740270][T11579] do_IRQ+0x123/0x360 [ 139.744233][T11579] ret_from_intr+0x0/0x33 [ 139.748560][T11579] kmsan_slab_free+0xac/0xf0 [ 139.753161][T11579] kmem_cache_free+0x2d1/0x2b70 [ 139.758000][T11579] __kfree_skb+0x1dd/0x210 [ 139.762395][T11579] tcp_recvmsg+0x27a6/0x4ff0 [ 139.767078][T11579] inet_recvmsg+0x237/0x7d0 [ 139.771574][T11579] sock_read_iter+0x5be/0x660 [ 139.776239][T11579] __vfs_read+0xa67/0xc90 [ 139.780554][T11579] vfs_read+0x359/0x6f0 [ 139.784700][T11579] ksys_read+0x265/0x430 [ 139.788940][T11579] __se_sys_read+0x92/0xb0 [ 139.793337][T11579] __x64_sys_read+0x4a/0x70 [ 139.797819][T11579] do_syscall_64+0xb6/0x160 [ 139.802298][T11579] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 139.808166][T11579] ===================================================== [ 139.815170][T11579] Disabling lock debugging due to kernel taint [ 139.821318][T11579] Kernel panic - not syncing: panic_on_warn set ... [ 139.827900][T11579] CPU: 1 PID: 11579 Comm: syz-fuzzer Tainted: G B 5.4.0-rc5+ #0 [ 139.836831][T11579] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 139.846888][T11579] Call Trace: [ 139.850401][T11579] dump_stack+0x191/0x1f0 [ 139.854883][T11579] panic+0x3c9/0xc1e [ 139.858794][T11579] kmsan_report+0x215/0x220 [ 139.863293][T11579] __msan_warning+0x73/0xe0 [ 139.867799][T11579] kmem_cache_free+0x3df/0x2b70 [ 139.872661][T11579] ? kmsan_internal_set_origin+0x6a/0xb0 [ 139.878672][T11579] ? kfree_skb+0x473/0x4c0 [ 139.883220][T11579] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 139.889517][T11579] kfree_skb+0x473/0x4c0 [ 139.893758][T11579] ? packet_rcv_spkt+0x68d/0x7c0 [ 139.898699][T11579] packet_rcv_spkt+0x68d/0x7c0 [ 139.903460][T11579] ? packet_rcv+0x2110/0x2110 [ 139.908137][T11579] dev_queue_xmit_nit+0x1125/0x1200 [ 139.913474][T11579] dev_hard_start_xmit+0x21e/0xab0 [ 139.918605][T11579] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 139.924662][T11579] sch_direct_xmit+0x56c/0x18c0 [ 139.929642][T11579] __dev_queue_xmit+0x212d/0x4200 [ 139.935119][T11579] dev_queue_xmit+0x4b/0x60 [ 139.939629][T11579] ip_finish_output2+0x20d6/0x25d0 [ 139.944728][T11579] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 139.950779][T11579] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 139.956768][T11579] __ip_finish_output+0xaf8/0xda0 [ 139.961781][T11579] ip_finish_output+0x2db/0x420 [ 139.966629][T11579] ip_output+0x541/0x610 [ 139.970856][T11579] ? ip_mc_finish_output+0x6d0/0x6d0 [ 139.976121][T11579] ? ip_finish_output+0x420/0x420 [ 139.981159][T11579] __ip_queue_xmit+0x1caf/0x21f0 [ 139.986090][T11579] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 139.991977][T11579] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 139.998034][T11579] ip_queue_xmit+0xcc/0xf0 [ 140.002457][T11579] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 140.008083][T11579] __tcp_transmit_skb+0x40e3/0x5d90 [ 140.013280][T11579] __tcp_send_ack+0x701/0x840 [ 140.017940][T11579] tcp_send_ack+0x68/0x90 [ 140.022250][T11579] tcp_cleanup_rbuf+0x764/0x800 [ 140.027108][T11579] tcp_recvmsg+0x334d/0x4ff0 [ 140.031825][T11579] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 140.037712][T11579] ? tcp_mmap+0x150/0x150 [ 140.042030][T11579] ? tcp_mmap+0x150/0x150 [ 140.046356][T11579] inet_recvmsg+0x237/0x7d0 [ 140.050863][T11579] ? inet_sendpage+0x2c0/0x2c0 [ 140.055629][T11579] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 140.061513][T11579] ? inet_sendpage+0x2c0/0x2c0 [ 140.066254][T11579] ? inet_sendpage+0x2c0/0x2c0 [ 140.071015][T11579] sock_read_iter+0x5be/0x660 [ 140.075695][T11579] ? kernel_sock_ip_overhead+0x340/0x340 [ 140.081454][T11579] __vfs_read+0xa67/0xc90 [ 140.085783][T11579] vfs_read+0x359/0x6f0 [ 140.090048][T11579] ksys_read+0x265/0x430 [ 140.094277][T11579] __se_sys_read+0x92/0xb0 [ 140.098675][T11579] __x64_sys_read+0x4a/0x70 [ 140.103202][T11579] do_syscall_64+0xb6/0x160 [ 140.107815][T11579] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 140.113696][T11579] RIP: 0033:0x47fd44 [ 140.117581][T11579] 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 [ 140.137181][T11579] RSP: 002b:000000c4202b5710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 140.145651][T11579] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 140.153605][T11579] RDX: 0000000000001000 RSI: 000000c4203c8000 RDI: 0000000000000003 [ 140.161556][T11579] RBP: 000000c4202b5760 R08: 0000000000000000 R09: 0000000000000000 [ 140.169720][T11579] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 140.177794][T11579] R13: 0000000000000008 R14: 0000000000000040 R15: ffffffffffffffff [ 140.187910][T11579] Kernel Offset: disabled [ 140.192253][T11579] Rebooting in 86400 seconds..