[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 76.394995][ T31] audit: type=1800 audit(1568922965.455:25): pid=11200 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 76.425352][ T31] audit: type=1800 audit(1568922965.475:26): pid=11200 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 76.463243][ T31] audit: type=1800 audit(1568922965.505:27): pid=11200 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 '10.128.0.88' (ECDSA) to the list of known hosts. 2019/09/19 19:56:19 fuzzer started 2019/09/19 19:56:23 dialing manager at 10.128.0.26:46509 2019/09/19 19:56:23 syscalls: 2381 2019/09/19 19:56:23 code coverage: enabled 2019/09/19 19:56:23 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/09/19 19:56:23 extra coverage: enabled 2019/09/19 19:56:23 setuid sandbox: enabled 2019/09/19 19:56:23 namespace sandbox: enabled 2019/09/19 19:56:23 Android sandbox: /sys/fs/selinux/policy does not exist 2019/09/19 19:56:23 fault injection: enabled 2019/09/19 19:56:23 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/09/19 19:56:23 net packet injection: enabled 2019/09/19 19:56:23 net device setup: enabled syzkaller login: [ 131.321874][T11363] ================================================================== [ 131.330000][T11363] BUG: KMSAN: uninit-value in kmem_cache_free+0x3df/0x2b70 [ 131.337180][T11363] CPU: 0 PID: 11363 Comm: syz-fuzzer Not tainted 5.3.0-rc7+ #0 [ 131.344695][T11363] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 131.354725][T11363] Call Trace: [ 131.357995][T11363] dump_stack+0x191/0x1f0 [ 131.362315][T11363] kmsan_report+0x162/0x2d0 [ 131.366795][T11363] __msan_warning+0x75/0xe0 [ 131.371277][T11363] kmem_cache_free+0x3df/0x2b70 [ 131.376106][T11363] ? kmsan_set_origin+0x6a/0xf0 [ 131.380933][T11363] ? kfree_skb+0x473/0x4c0 [ 131.385325][T11363] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 131.391416][T11363] kfree_skb+0x473/0x4c0 [ 131.395648][T11363] ? packet_rcv_spkt+0x719/0x840 [ 131.400652][T11363] packet_rcv_spkt+0x719/0x840 [ 131.405435][T11363] ? packet_rcv+0x2190/0x2190 [ 131.410086][T11363] dev_queue_xmit_nit+0x1125/0x1200 [ 131.415292][T11363] dev_hard_start_xmit+0x21e/0xab0 [ 131.420391][T11363] sch_direct_xmit+0x56c/0x18c0 [ 131.425239][T11363] ? kmsan_set_origin+0x6a/0xf0 [ 131.430081][T11363] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 131.436076][T11363] __dev_queue_xmit+0x1e53/0x4270 [ 131.441091][T11363] dev_queue_xmit+0x4b/0x60 [ 131.445579][T11363] ip_finish_output2+0x20c6/0x25d0 [ 131.450665][T11363] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 131.456726][T11363] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 131.462699][T11363] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 131.468688][T11363] __ip_finish_output+0xaf8/0xda0 [ 131.473697][T11363] ip_finish_output+0x2db/0x420 [ 131.478528][T11363] ip_output+0x541/0x610 [ 131.482754][T11363] ? ip_mc_finish_output+0x6d0/0x6d0 [ 131.488141][T11363] ? ip_finish_output+0x420/0x420 [ 131.493149][T11363] __ip_queue_xmit+0x1caf/0x21f0 [ 131.498062][T11363] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 131.503934][T11363] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 131.509984][T11363] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 131.516029][T11363] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 131.521916][T11363] ip_queue_xmit+0xcc/0xf0 [ 131.526311][T11363] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 131.531918][T11363] __tcp_transmit_skb+0x409e/0x5c60 [ 131.537112][T11363] __tcp_send_ack+0x701/0x840 [ 131.541772][T11363] tcp_send_ack+0x68/0x90 [ 131.546078][T11363] tcp_cleanup_rbuf+0x764/0x800 [ 131.550920][T11363] tcp_recvmsg+0x334d/0x4ff0 [ 131.555509][T11363] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 131.561389][T11363] ? inet_recvmsg+0xc3/0x7d0 [ 131.565952][T11363] ? tcp_mmap+0x150/0x150 [ 131.570267][T11363] ? tcp_mmap+0x150/0x150 [ 131.574573][T11363] inet_recvmsg+0x237/0x7d0 [ 131.579063][T11363] ? inet_sendpage+0x2c0/0x2c0 [ 131.583803][T11363] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 131.589759][T11363] ? inet_sendpage+0x2c0/0x2c0 [ 131.594498][T11363] ? inet_sendpage+0x2c0/0x2c0 [ 131.599240][T11363] sock_read_iter+0x5be/0x660 [ 131.603910][T11363] ? kernel_sock_ip_overhead+0x340/0x340 [ 131.609516][T11363] __vfs_read+0xa67/0xc90 [ 131.613835][T11363] vfs_read+0x359/0x6f0 [ 131.617968][T11363] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 131.623835][T11363] ksys_read+0x265/0x430 [ 131.628059][T11363] __se_sys_read+0x92/0xb0 [ 131.632455][T11363] __x64_sys_read+0x4a/0x70 [ 131.636944][T11363] do_syscall_64+0xbc/0xf0 [ 131.641350][T11363] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 131.647217][T11363] RIP: 0033:0x47fd44 [ 131.651086][T11363] 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 [ 131.673024][T11363] RSP: 002b:000000c420273710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 131.681411][T11363] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 131.689358][T11363] RDX: 0000000000001000 RSI: 000000c420388000 RDI: 0000000000000003 [ 131.697306][T11363] RBP: 000000c420273760 R08: 0000000000000000 R09: 0000000000000000 [ 131.705265][T11363] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 131.713312][T11363] R13: 0000000000000008 R14: 0000000000000008 R15: ffffffffffffffff [ 131.721275][T11363] [ 131.723577][T11363] Uninit was stored to memory at: [ 131.728579][T11363] kmsan_internal_chain_origin+0xcc/0x150 [ 131.734287][T11363] __msan_chain_origin+0x6b/0xe0 [ 131.739216][T11363] ___slab_alloc+0x1dbc/0x1fb0 [ 131.743961][T11363] kmem_cache_alloc+0xade/0xd10 [ 131.748789][T11363] skb_clone+0x326/0x5d0 [ 131.753020][T11363] dev_queue_xmit_nit+0x539/0x1200 [ 131.758366][T11363] dev_hard_start_xmit+0x21e/0xab0 [ 131.764966][T11363] sch_direct_xmit+0x56c/0x18c0 [ 131.770066][T11363] __dev_queue_xmit+0x1e53/0x4270 [ 131.775512][T11363] dev_queue_xmit+0x4b/0x60 [ 131.780638][T11363] ip_finish_output2+0x20c6/0x25d0 [ 131.786551][T11363] __ip_finish_output+0xaf8/0xda0 [ 131.792191][T11363] ip_finish_output+0x2db/0x420 [ 131.797151][T11363] ip_output+0x541/0x610 [ 131.801636][T11363] __ip_queue_xmit+0x1caf/0x21f0 [ 131.806975][T11363] ip_queue_xmit+0xcc/0xf0 [ 131.811937][T11363] __tcp_transmit_skb+0x409e/0x5c60 [ 131.817234][T11363] __tcp_send_ack+0x701/0x840 [ 131.822790][T11363] tcp_send_ack+0x68/0x90 [ 131.828690][T11363] tcp_cleanup_rbuf+0x764/0x800 [ 131.833674][T11363] tcp_recvmsg+0x334d/0x4ff0 [ 131.838425][T11363] inet_recvmsg+0x237/0x7d0 [ 131.844587][T11363] sock_read_iter+0x5be/0x660 [ 131.849254][T11363] __vfs_read+0xa67/0xc90 [ 131.854201][T11363] vfs_read+0x359/0x6f0 [ 131.861427][T11363] ksys_read+0x265/0x430 [ 131.868327][T11363] __se_sys_read+0x92/0xb0 [ 131.873618][T11363] __x64_sys_read+0x4a/0x70 [ 131.879933][T11363] do_syscall_64+0xbc/0xf0 [ 131.885096][T11363] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 131.891687][T11363] [ 131.894008][T11363] Uninit was created at: [ 131.898671][T11363] kmsan_internal_poison_shadow+0x58/0xb0 [ 131.904380][T11363] kmsan_slab_free+0x8d/0x100 [ 131.909289][T11363] kmem_cache_free_bulk+0x3ad9/0x3f50 [ 131.914655][T11363] __kfree_skb_flush+0xb0/0x100 [ 131.921978][T11363] net_rx_action+0x1908/0x1950 [ 131.927285][T11363] __do_softirq+0x4a1/0x83a [ 131.932057][T11363] irq_exit+0x230/0x280 [ 131.936216][T11363] do_IRQ+0x20d/0x3a0 [ 131.940297][T11363] ret_from_intr+0x0/0x33 [ 131.944784][T11363] __msan_poison_alloca+0x23/0x270 [ 131.949896][T11363] __ip_local_out+0x58d/0x800 [ 131.954589][T11363] __ip_queue_xmit+0x1bdc/0x21f0 [ 131.959533][T11363] ip_queue_xmit+0xcc/0xf0 [ 131.963927][T11363] __tcp_transmit_skb+0x409e/0x5c60 [ 131.969106][T11363] __tcp_send_ack+0x701/0x840 [ 131.973771][T11363] tcp_send_ack+0x68/0x90 [ 131.978097][T11363] tcp_cleanup_rbuf+0x764/0x800 [ 131.983014][T11363] tcp_recvmsg+0x334d/0x4ff0 [ 131.987776][T11363] inet_recvmsg+0x237/0x7d0 [ 131.992271][T11363] sock_read_iter+0x5be/0x660 [ 131.997042][T11363] __vfs_read+0xa67/0xc90 [ 132.001602][T11363] vfs_read+0x359/0x6f0 [ 132.005850][T11363] ksys_read+0x265/0x430 [ 132.010078][T11363] __se_sys_read+0x92/0xb0 [ 132.014485][T11363] __x64_sys_read+0x4a/0x70 [ 132.019208][T11363] do_syscall_64+0xbc/0xf0 [ 132.025120][T11363] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 132.031167][T11363] ================================================================== [ 132.039847][T11363] Disabling lock debugging due to kernel taint [ 132.046426][T11363] Kernel panic - not syncing: panic_on_warn set ... [ 132.053123][T11363] CPU: 0 PID: 11363 Comm: syz-fuzzer Tainted: G B 5.3.0-rc7+ #0 [ 132.062232][T11363] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 132.072281][T11363] Call Trace: [ 132.075727][T11363] dump_stack+0x191/0x1f0 [ 132.080052][T11363] panic+0x3c9/0xc1e [ 132.083949][T11363] kmsan_report+0x2ca/0x2d0 [ 132.088528][T11363] __msan_warning+0x75/0xe0 [ 132.093024][T11363] kmem_cache_free+0x3df/0x2b70 [ 132.097863][T11363] ? kmsan_set_origin+0x6a/0xf0 [ 132.102695][T11363] ? kfree_skb+0x473/0x4c0 [ 132.107112][T11363] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 132.113287][T11363] kfree_skb+0x473/0x4c0 [ 132.117518][T11363] ? packet_rcv_spkt+0x719/0x840 [ 132.122444][T11363] packet_rcv_spkt+0x719/0x840 [ 132.127334][T11363] ? packet_rcv+0x2190/0x2190 [ 132.132031][T11363] dev_queue_xmit_nit+0x1125/0x1200 [ 132.137242][T11363] dev_hard_start_xmit+0x21e/0xab0 [ 132.142374][T11363] sch_direct_xmit+0x56c/0x18c0 [ 132.147236][T11363] ? kmsan_set_origin+0x6a/0xf0 [ 132.152089][T11363] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 132.157973][T11363] __dev_queue_xmit+0x1e53/0x4270 [ 132.163010][T11363] dev_queue_xmit+0x4b/0x60 [ 132.167500][T11363] ip_finish_output2+0x20c6/0x25d0 [ 132.172593][T11363] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 132.178639][T11363] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 132.184600][T11363] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 132.190605][T11363] __ip_finish_output+0xaf8/0xda0 [ 132.195732][T11363] ip_finish_output+0x2db/0x420 [ 132.200583][T11363] ip_output+0x541/0x610 [ 132.204841][T11363] ? ip_mc_finish_output+0x6d0/0x6d0 [ 132.210110][T11363] ? ip_finish_output+0x420/0x420 [ 132.215204][T11363] __ip_queue_xmit+0x1caf/0x21f0 [ 132.220159][T11363] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 132.226079][T11363] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 132.233269][T11363] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 132.239319][T11363] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 132.245197][T11363] ip_queue_xmit+0xcc/0xf0 [ 132.249613][T11363] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 132.255252][T11363] __tcp_transmit_skb+0x409e/0x5c60 [ 132.260451][T11363] __tcp_send_ack+0x701/0x840 [ 132.265113][T11363] tcp_send_ack+0x68/0x90 [ 132.269462][T11363] tcp_cleanup_rbuf+0x764/0x800 [ 132.274497][T11363] tcp_recvmsg+0x334d/0x4ff0 [ 132.279252][T11363] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 132.285146][T11363] ? inet_recvmsg+0xc3/0x7d0 [ 132.289735][T11363] ? tcp_mmap+0x150/0x150 [ 132.294061][T11363] ? tcp_mmap+0x150/0x150 [ 132.321596][T11363] inet_recvmsg+0x237/0x7d0 [ 132.327160][T11363] ? inet_sendpage+0x2c0/0x2c0 [ 132.332293][T11363] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 132.338524][T11363] ? inet_sendpage+0x2c0/0x2c0 [ 132.343576][T11363] ? inet_sendpage+0x2c0/0x2c0 [ 132.348338][T11363] sock_read_iter+0x5be/0x660 [ 132.353124][T11363] ? kernel_sock_ip_overhead+0x340/0x340 [ 132.358963][T11363] __vfs_read+0xa67/0xc90 [ 132.363295][T11363] vfs_read+0x359/0x6f0 [ 132.367530][T11363] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 132.373535][T11363] ksys_read+0x265/0x430 [ 132.378038][T11363] __se_sys_read+0x92/0xb0 [ 132.382451][T11363] __x64_sys_read+0x4a/0x70 [ 132.387004][T11363] do_syscall_64+0xbc/0xf0 [ 132.391604][T11363] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 132.397587][T11363] RIP: 0033:0x47fd44 [ 132.403668][T11363] 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 [ 132.425109][T11363] RSP: 002b:000000c420273710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 132.433810][T11363] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 132.442008][T11363] RDX: 0000000000001000 RSI: 000000c420388000 RDI: 0000000000000003 [ 132.450615][T11363] RBP: 000000c420273760 R08: 0000000000000000 R09: 0000000000000000 [ 132.458574][T11363] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 132.466534][T11363] R13: 0000000000000008 R14: 0000000000000008 R15: ffffffffffffffff [ 132.476044][T11363] Kernel Offset: disabled [ 132.481964][T11363] Rebooting in 86400 seconds..