[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 93.965476][ T31] audit: type=1800 audit(1573285493.024:25): pid=13645 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 94.002324][ T31] audit: type=1800 audit(1573285493.044:26): pid=13645 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 94.022484][ T31] audit: type=1800 audit(1573285493.054:27): pid=13645 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 '10.128.0.59' (ECDSA) to the list of known hosts. 2019/11/09 07:45:06 fuzzer started 2019/11/09 07:45:10 dialing manager at 10.128.0.26:45743 2019/11/09 07:45:10 syscalls: 2397 2019/11/09 07:45:10 code coverage: enabled 2019/11/09 07:45:10 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/11/09 07:45:10 extra coverage: enabled 2019/11/09 07:45:10 setuid sandbox: enabled 2019/11/09 07:45:10 namespace sandbox: enabled 2019/11/09 07:45:10 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/09 07:45:10 fault injection: enabled 2019/11/09 07:45:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/09 07:45:10 net packet injection: enabled 2019/11/09 07:45:10 net device setup: enabled 2019/11/09 07:45:10 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2019/11/09 07:45:10 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 139.382380][T13798] ===================================================== [ 139.389399][T13798] BUG: KMSAN: use-after-free in kmem_cache_free+0x3df/0x2b70 [ 139.396782][T13798] CPU: 0 PID: 13798 Comm: syz-fuzzer Not tainted 5.4.0-rc5+ #0 [ 139.404326][T13798] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 139.414373][T13798] Call Trace: [ 139.417716][T13798] dump_stack+0x191/0x1f0 [ 139.422047][T13798] kmsan_report+0x128/0x220 [ 139.426538][T13798] __msan_warning+0x73/0xe0 [ 139.431026][T13798] kmem_cache_free+0x3df/0x2b70 [ 139.435859][T13798] ? kmsan_internal_set_origin+0x6a/0xb0 [ 139.441471][T13798] ? kfree_skb+0x473/0x4c0 [ 139.445865][T13798] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 139.451980][T13798] kfree_skb+0x473/0x4c0 [ 139.456211][T13798] ? packet_rcv_spkt+0x68d/0x7c0 [ 139.461126][T13798] packet_rcv_spkt+0x68d/0x7c0 [ 139.465893][T13798] ? packet_rcv+0x2110/0x2110 [ 139.470547][T13798] dev_queue_xmit_nit+0x1125/0x1200 [ 139.475742][T13798] dev_hard_start_xmit+0x21e/0xab0 [ 139.480840][T13798] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 139.486713][T13798] sch_direct_xmit+0x56c/0x18c0 [ 139.491553][T13798] __dev_queue_xmit+0x212d/0x4200 [ 139.496571][T13798] dev_queue_xmit+0x4b/0x60 [ 139.501062][T13798] ip_finish_output2+0x20d6/0x25d0 [ 139.506163][T13798] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 139.512209][T13798] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 139.518180][T13798] __ip_finish_output+0xaf8/0xda0 [ 139.523189][T13798] ip_finish_output+0x2db/0x420 [ 139.528024][T13798] ip_output+0x541/0x610 [ 139.532254][T13798] ? ip_mc_finish_output+0x6d0/0x6d0 [ 139.537524][T13798] ? ip_finish_output+0x420/0x420 [ 139.542527][T13798] __ip_queue_xmit+0x1caf/0x21f0 [ 139.547458][T13798] ip_queue_xmit+0xcc/0xf0 [ 139.551853][T13798] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 139.557468][T13798] __tcp_transmit_skb+0x40e3/0x5d90 [ 139.562662][T13798] __tcp_send_ack+0x701/0x840 [ 139.567381][T13798] tcp_send_ack+0x68/0x90 [ 139.571697][T13798] tcp_cleanup_rbuf+0x764/0x800 [ 139.576641][T13798] tcp_recvmsg+0x334d/0x4ff0 [ 139.581248][T13798] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 139.587126][T13798] ? tcp_mmap+0x150/0x150 [ 139.591440][T13798] ? tcp_mmap+0x150/0x150 [ 139.596373][T13798] inet_recvmsg+0x237/0x7d0 [ 139.600859][T13798] ? inet_sendpage+0x2c0/0x2c0 [ 139.605665][T13798] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 139.611553][T13798] ? inet_sendpage+0x2c0/0x2c0 [ 139.616292][T13798] ? inet_sendpage+0x2c0/0x2c0 [ 139.621034][T13798] sock_read_iter+0x5be/0x660 [ 139.625695][T13798] ? kernel_sock_ip_overhead+0x340/0x340 [ 139.631304][T13798] __vfs_read+0xa67/0xc90 [ 139.635629][T13798] vfs_read+0x359/0x6f0 [ 139.639768][T13798] ksys_read+0x265/0x430 [ 139.644004][T13798] __se_sys_read+0x92/0xb0 [ 139.648412][T13798] __x64_sys_read+0x4a/0x70 [ 139.652899][T13798] do_syscall_64+0xb6/0x160 [ 139.657383][T13798] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 139.663250][T13798] RIP: 0033:0x47fd44 [ 139.667143][T13798] 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 [ 139.686725][T13798] RSP: 002b:000000c4203d1710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 139.695115][T13798] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 139.703065][T13798] RDX: 0000000000001000 RSI: 000000c4203e6000 RDI: 0000000000000003 [ 139.711013][T13798] RBP: 000000c4203d1760 R08: 0000000000000000 R09: 0000000000000000 [ 139.718965][T13798] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 139.726929][T13798] R13: 0000000000000008 R14: 0000000000000002 R15: ffffffffffffffff [ 139.734898][T13798] [ 139.737208][T13798] Uninit was stored to memory at: [ 139.742227][T13798] kmsan_internal_chain_origin+0xbd/0x180 [ 139.747923][T13798] __msan_chain_origin+0x6b/0xd0 [ 139.752839][T13798] ___slab_alloc+0x1dbc/0x1fb0 [ 139.757580][T13798] kmem_cache_alloc+0xadf/0xd20 [ 139.762411][T13798] skb_clone+0x326/0x5d0 [ 139.766634][T13798] dev_queue_xmit_nit+0x539/0x1200 [ 139.771736][T13798] dev_hard_start_xmit+0x21e/0xab0 [ 139.776826][T13798] sch_direct_xmit+0x56c/0x18c0 [ 139.781667][T13798] __dev_queue_xmit+0x212d/0x4200 [ 139.786669][T13798] dev_queue_xmit+0x4b/0x60 [ 139.791412][T13798] ip_finish_output2+0x20d6/0x25d0 [ 139.796507][T13798] __ip_finish_output+0xaf8/0xda0 [ 139.801509][T13798] ip_finish_output+0x2db/0x420 [ 139.806352][T13798] ip_output+0x541/0x610 [ 139.810585][T13798] __ip_queue_xmit+0x1caf/0x21f0 [ 139.815503][T13798] ip_queue_xmit+0xcc/0xf0 [ 139.819897][T13798] __tcp_transmit_skb+0x40e3/0x5d90 [ 139.825070][T13798] __tcp_send_ack+0x701/0x840 [ 139.829721][T13798] tcp_send_ack+0x68/0x90 [ 139.834023][T13798] tcp_cleanup_rbuf+0x764/0x800 [ 139.838852][T13798] tcp_recvmsg+0x334d/0x4ff0 [ 139.843422][T13798] inet_recvmsg+0x237/0x7d0 [ 139.847904][T13798] sock_read_iter+0x5be/0x660 [ 139.852569][T13798] __vfs_read+0xa67/0xc90 [ 139.856871][T13798] vfs_read+0x359/0x6f0 [ 139.861015][T13798] ksys_read+0x265/0x430 [ 139.865251][T13798] __se_sys_read+0x92/0xb0 [ 139.869640][T13798] __x64_sys_read+0x4a/0x70 [ 139.874118][T13798] do_syscall_64+0xb6/0x160 [ 139.878601][T13798] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 139.884465][T13798] [ 139.886768][T13798] Uninit was created at: [ 139.890987][T13798] kmsan_internal_poison_shadow+0x60/0x120 [ 139.896772][T13798] kmsan_slab_free+0x8d/0xf0 [ 139.901337][T13798] kmem_cache_free_bulk+0x3ad9/0x3f10 [ 139.906686][T13798] __kfree_skb_flush+0xb0/0x100 [ 139.911516][T13798] net_rx_action+0x1a5e/0x1aa0 [ 139.916270][T13798] __do_softirq+0x4a1/0x83a [ 139.920750][T13798] do_softirq_own_stack+0x49/0x80 [ 139.925767][T13798] __local_bh_enable_ip+0x184/0x1d0 [ 139.930942][T13798] local_bh_enable+0x36/0x40 [ 139.935524][T13798] lock_sock_nested+0x22f/0x290 [ 139.940405][T13798] tcp_recvmsg+0x35f/0x4ff0 [ 139.944890][T13798] inet_recvmsg+0x237/0x7d0 [ 139.949375][T13798] sock_read_iter+0x5be/0x660 [ 139.954040][T13798] __vfs_read+0xa67/0xc90 [ 139.958355][T13798] vfs_read+0x359/0x6f0 [ 139.962496][T13798] ksys_read+0x265/0x430 [ 139.966729][T13798] __se_sys_read+0x92/0xb0 [ 139.971120][T13798] __x64_sys_read+0x4a/0x70 [ 139.975604][T13798] do_syscall_64+0xb6/0x160 [ 139.980087][T13798] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 139.985949][T13798] ===================================================== [ 139.992865][T13798] Disabling lock debugging due to kernel taint [ 139.998996][T13798] Kernel panic - not syncing: panic_on_warn set ... [ 140.005567][T13798] CPU: 0 PID: 13798 Comm: syz-fuzzer Tainted: G B 5.4.0-rc5+ #0 [ 140.014473][T13798] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 140.024505][T13798] Call Trace: [ 140.027776][T13798] dump_stack+0x191/0x1f0 [ 140.032094][T13798] panic+0x3c9/0xc1e [ 140.035985][T13798] kmsan_report+0x215/0x220 [ 140.040476][T13798] __msan_warning+0x73/0xe0 [ 140.044957][T13798] kmem_cache_free+0x3df/0x2b70 [ 140.049786][T13798] ? kmsan_internal_set_origin+0x6a/0xb0 [ 140.055396][T13798] ? kfree_skb+0x473/0x4c0 [ 140.059793][T13798] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 140.065851][T13798] kfree_skb+0x473/0x4c0 [ 140.070072][T13798] ? packet_rcv_spkt+0x68d/0x7c0 [ 140.074989][T13798] packet_rcv_spkt+0x68d/0x7c0 [ 140.079735][T13798] ? packet_rcv+0x2110/0x2110 [ 140.084402][T13798] dev_queue_xmit_nit+0x1125/0x1200 [ 140.089612][T13798] dev_hard_start_xmit+0x21e/0xab0 [ 140.094714][T13798] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 140.100592][T13798] sch_direct_xmit+0x56c/0x18c0 [ 140.105432][T13798] __dev_queue_xmit+0x212d/0x4200 [ 140.110447][T13798] dev_queue_xmit+0x4b/0x60 [ 140.114932][T13798] ip_finish_output2+0x20d6/0x25d0 [ 140.120038][T13798] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 140.126084][T13798] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 140.132070][T13798] __ip_finish_output+0xaf8/0xda0 [ 140.137096][T13798] ip_finish_output+0x2db/0x420 [ 140.141929][T13798] ip_output+0x541/0x610 [ 140.146160][T13798] ? ip_mc_finish_output+0x6d0/0x6d0 [ 140.151452][T13798] ? ip_finish_output+0x420/0x420 [ 140.156460][T13798] __ip_queue_xmit+0x1caf/0x21f0 [ 140.161391][T13798] ip_queue_xmit+0xcc/0xf0 [ 140.165792][T13798] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 140.171421][T13798] __tcp_transmit_skb+0x40e3/0x5d90 [ 140.176621][T13798] __tcp_send_ack+0x701/0x840 [ 140.181286][T13798] tcp_send_ack+0x68/0x90 [ 140.185598][T13798] tcp_cleanup_rbuf+0x764/0x800 [ 140.190444][T13798] tcp_recvmsg+0x334d/0x4ff0 [ 140.195037][T13798] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 140.200910][T13798] ? tcp_mmap+0x150/0x150 [ 140.205230][T13798] ? tcp_mmap+0x150/0x150 [ 140.209534][T13798] inet_recvmsg+0x237/0x7d0 [ 140.214023][T13798] ? inet_sendpage+0x2c0/0x2c0 [ 140.218888][T13798] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 140.224771][T13798] ? inet_sendpage+0x2c0/0x2c0 [ 140.229510][T13798] ? inet_sendpage+0x2c0/0x2c0 [ 140.234256][T13798] sock_read_iter+0x5be/0x660 [ 140.238919][T13798] ? kernel_sock_ip_overhead+0x340/0x340 [ 140.244530][T13798] __vfs_read+0xa67/0xc90 [ 140.248854][T13798] vfs_read+0x359/0x6f0 [ 140.252993][T13798] ksys_read+0x265/0x430 [ 140.257218][T13798] __se_sys_read+0x92/0xb0 [ 140.261628][T13798] __x64_sys_read+0x4a/0x70 [ 140.266108][T13798] do_syscall_64+0xb6/0x160 [ 140.270590][T13798] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 140.276496][T13798] RIP: 0033:0x47fd44 [ 140.280373][T13798] 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 [ 140.299970][T13798] RSP: 002b:000000c4203d1710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 140.308369][T13798] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 140.316325][T13798] RDX: 0000000000001000 RSI: 000000c4203e6000 RDI: 0000000000000003 [ 140.324280][T13798] RBP: 000000c4203d1760 R08: 0000000000000000 R09: 0000000000000000 [ 140.332373][T13798] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 140.340333][T13798] R13: 0000000000000008 R14: 0000000000000002 R15: ffffffffffffffff [ 140.349740][T13798] Kernel Offset: disabled [ 140.354115][T13798] Rebooting in 86400 seconds..