[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 85.205740][ T32] audit: type=1800 audit(1572790987.263:25): pid=12118 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 85.228947][ T32] audit: type=1800 audit(1572790987.283:26): pid=12118 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 85.265179][ T32] audit: type=1800 audit(1572790987.313:27): pid=12118 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 '10.128.1.37' (ECDSA) to the list of known hosts. 2019/11/03 14:23:23 fuzzer started 2019/11/03 14:23:28 dialing manager at 10.128.0.26:45579 2019/11/03 14:23:28 syscalls: 2445 2019/11/03 14:23:28 code coverage: enabled 2019/11/03 14:23:28 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/11/03 14:23:28 extra coverage: enabled 2019/11/03 14:23:28 setuid sandbox: enabled 2019/11/03 14:23:28 namespace sandbox: enabled 2019/11/03 14:23:28 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/03 14:23:28 fault injection: enabled 2019/11/03 14:23:28 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/03 14:23:28 net packet injection: enabled 2019/11/03 14:23:28 net device setup: enabled 2019/11/03 14:23:28 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist syzkaller login: [ 134.662599][T12269] ===================================================== [ 134.669598][T12269] BUG: KMSAN: use-after-free in kmem_cache_free+0x3df/0x2b70 [ 134.676970][T12269] CPU: 0 PID: 12269 Comm: syz-fuzzer Not tainted 5.4.0-rc5+ #0 [ 134.684512][T12269] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 134.694563][T12269] Call Trace: [ 134.697863][T12269] dump_stack+0x191/0x1f0 [ 134.702211][T12269] kmsan_report+0x128/0x220 [ 134.706736][T12269] __msan_warning+0x73/0xe0 [ 134.711252][T12269] kmem_cache_free+0x3df/0x2b70 [ 134.716115][T12269] ? kmsan_internal_set_origin+0x6a/0xb0 [ 134.721739][T12269] ? kfree_skb+0x473/0x4c0 [ 134.726133][T12269] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 134.732191][T12269] kfree_skb+0x473/0x4c0 [ 134.736420][T12269] ? packet_rcv_spkt+0x68d/0x7c0 [ 134.741443][T12269] packet_rcv_spkt+0x68d/0x7c0 [ 134.746192][T12269] ? packet_rcv+0x2110/0x2110 [ 134.750857][T12269] dev_queue_xmit_nit+0x1125/0x1200 [ 134.756050][T12269] dev_hard_start_xmit+0x21e/0xab0 [ 134.761149][T12269] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 134.767026][T12269] sch_direct_xmit+0x56c/0x18c0 [ 134.771866][T12269] __dev_queue_xmit+0x212d/0x4200 [ 134.776879][T12269] dev_queue_xmit+0x4b/0x60 [ 134.781361][T12269] ip_finish_output2+0x20d6/0x25d0 [ 134.786450][T12269] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 134.792494][T12269] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 134.798463][T12269] __ip_finish_output+0xaf8/0xda0 [ 134.803475][T12269] ip_finish_output+0x2db/0x420 [ 134.808308][T12269] ip_output+0x541/0x610 [ 134.812541][T12269] ? ip_mc_finish_output+0x6d0/0x6d0 [ 134.817804][T12269] ? ip_finish_output+0x420/0x420 [ 134.822804][T12269] __ip_queue_xmit+0x1caf/0x21f0 [ 134.827719][T12269] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 134.833603][T12269] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 134.839659][T12269] ip_queue_xmit+0xcc/0xf0 [ 134.844072][T12269] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 134.849694][T12269] __tcp_transmit_skb+0x40e3/0x5d90 [ 134.854999][T12269] __tcp_send_ack+0x701/0x840 [ 134.859670][T12269] tcp_send_ack+0x68/0x90 [ 134.864184][T12269] tcp_cleanup_rbuf+0x764/0x800 [ 134.869088][T12269] tcp_recvmsg+0x334d/0x4ff0 [ 134.873685][T12269] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 134.879558][T12269] ? tcp_mmap+0x150/0x150 [ 134.883866][T12269] ? tcp_mmap+0x150/0x150 [ 134.888175][T12269] inet_recvmsg+0x237/0x7d0 [ 134.892660][T12269] ? inet_sendpage+0x2c0/0x2c0 [ 134.897412][T12269] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 134.903287][T12269] ? inet_sendpage+0x2c0/0x2c0 [ 134.908026][T12269] ? inet_sendpage+0x2c0/0x2c0 [ 134.912767][T12269] sock_read_iter+0x5be/0x660 [ 134.917432][T12269] ? kernel_sock_ip_overhead+0x340/0x340 [ 134.923041][T12269] __vfs_read+0xa67/0xc90 [ 134.927446][T12269] vfs_read+0x359/0x6f0 [ 134.931757][T12269] ksys_read+0x265/0x430 [ 134.935984][T12269] __se_sys_read+0x92/0xb0 [ 134.940379][T12269] __x64_sys_read+0x4a/0x70 [ 134.944859][T12269] do_syscall_64+0xb6/0x160 [ 134.949349][T12269] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 134.955218][T12269] RIP: 0033:0x47fd44 [ 134.959091][T12269] 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 [ 134.978691][T12269] RSP: 002b:000000c4203c3760 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 134.987090][T12269] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 134.995040][T12269] RDX: 0000000000001000 RSI: 000000c4203f6000 RDI: 0000000000000003 [ 135.002989][T12269] RBP: 000000c4203c37b0 R08: 0000000000000000 R09: 0000000000000000 [ 135.010939][T12269] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 135.018886][T12269] R13: 0000000000000008 R14: 0000000000000004 R15: ffffffffffffffff [ 135.026842][T12269] [ 135.029150][T12269] Uninit was stored to memory at: [ 135.034163][T12269] kmsan_internal_chain_origin+0xbd/0x180 [ 135.039870][T12269] __msan_chain_origin+0x6b/0xd0 [ 135.044797][T12269] ___slab_alloc+0x1dbc/0x1fb0 [ 135.049543][T12269] kmem_cache_alloc+0xadf/0xd20 [ 135.054403][T12269] skb_clone+0x326/0x5d0 [ 135.058632][T12269] dev_queue_xmit_nit+0x539/0x1200 [ 135.063817][T12269] dev_hard_start_xmit+0x21e/0xab0 [ 135.068907][T12269] sch_direct_xmit+0x56c/0x18c0 [ 135.073818][T12269] __dev_queue_xmit+0x212d/0x4200 [ 135.078829][T12269] dev_queue_xmit+0x4b/0x60 [ 135.083322][T12269] ip_finish_output2+0x20d6/0x25d0 [ 135.088420][T12269] __ip_finish_output+0xaf8/0xda0 [ 135.093422][T12269] ip_finish_output+0x2db/0x420 [ 135.098252][T12269] ip_output+0x541/0x610 [ 135.102471][T12269] __ip_queue_xmit+0x1caf/0x21f0 [ 135.107387][T12269] ip_queue_xmit+0xcc/0xf0 [ 135.111790][T12269] __tcp_transmit_skb+0x40e3/0x5d90 [ 135.116964][T12269] __tcp_send_ack+0x701/0x840 [ 135.121617][T12269] tcp_send_ack+0x68/0x90 [ 135.125922][T12269] tcp_cleanup_rbuf+0x764/0x800 [ 135.130762][T12269] tcp_recvmsg+0x334d/0x4ff0 [ 135.135327][T12269] inet_recvmsg+0x237/0x7d0 [ 135.139803][T12269] sock_read_iter+0x5be/0x660 [ 135.144469][T12269] __vfs_read+0xa67/0xc90 [ 135.148780][T12269] vfs_read+0x359/0x6f0 [ 135.152919][T12269] ksys_read+0x265/0x430 [ 135.157143][T12269] __se_sys_read+0x92/0xb0 [ 135.161579][T12269] __x64_sys_read+0x4a/0x70 [ 135.166064][T12269] do_syscall_64+0xb6/0x160 [ 135.170546][T12269] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 135.176411][T12269] [ 135.178718][T12269] Uninit was created at: [ 135.185894][T12269] kmsan_internal_poison_shadow+0x60/0x120 [ 135.191676][T12269] kmsan_slab_free+0x8d/0xf0 [ 135.196244][T12269] kmem_cache_free_bulk+0x3ad9/0x3f10 [ 135.201590][T12269] __kfree_skb_flush+0xb0/0x100 [ 135.206419][T12269] net_rx_action+0x1a5e/0x1aa0 [ 135.211161][T12269] __do_softirq+0x4a1/0x83a [ 135.215643][T12269] irq_exit+0x230/0x280 [ 135.219808][T12269] do_IRQ+0x123/0x360 [ 135.223783][T12269] ret_from_intr+0x0/0x33 [ 135.228100][T12269] stack_trace_consume_entry+0x0/0x320 [ 135.233538][T12269] stack_trace_save+0x11c/0x1b0 [ 135.238387][T12269] kmsan_internal_chain_origin+0xbd/0x180 [ 135.244103][T12269] kmsan_memcpy_memmove_metadata+0x25c/0x2e0 [ 135.250080][T12269] kmsan_memcpy_metadata+0xb/0x10 [ 135.255085][T12269] __msan_memcpy+0x56/0x70 [ 135.259497][T12269] sock_read_iter+0x47c/0x660 [ 135.264150][T12269] __vfs_read+0xa67/0xc90 [ 135.268456][T12269] vfs_read+0x359/0x6f0 [ 135.272585][T12269] ksys_read+0x265/0x430 [ 135.276802][T12269] __se_sys_read+0x92/0xb0 [ 135.281193][T12269] __x64_sys_read+0x4a/0x70 [ 135.285682][T12269] do_syscall_64+0xb6/0x160 [ 135.290164][T12269] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 135.296042][T12269] ===================================================== [ 135.302950][T12269] Disabling lock debugging due to kernel taint [ 135.309078][T12269] Kernel panic - not syncing: panic_on_warn set ... [ 135.315654][T12269] CPU: 0 PID: 12269 Comm: syz-fuzzer Tainted: G B 5.4.0-rc5+ #0 [ 135.324558][T12269] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 135.334610][T12269] Call Trace: [ 135.337916][T12269] dump_stack+0x191/0x1f0 [ 135.342237][T12269] panic+0x3c9/0xc1e [ 135.346737][T12269] kmsan_report+0x215/0x220 [ 135.351224][T12269] __msan_warning+0x73/0xe0 [ 135.355705][T12269] kmem_cache_free+0x3df/0x2b70 [ 135.360556][T12269] ? kmsan_internal_set_origin+0x6a/0xb0 [ 135.366171][T12269] ? kfree_skb+0x473/0x4c0 [ 135.370569][T12269] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 135.376625][T12269] kfree_skb+0x473/0x4c0 [ 135.380857][T12269] ? packet_rcv_spkt+0x68d/0x7c0 [ 135.385775][T12269] packet_rcv_spkt+0x68d/0x7c0 [ 135.390537][T12269] ? packet_rcv+0x2110/0x2110 [ 135.395197][T12269] dev_queue_xmit_nit+0x1125/0x1200 [ 135.400387][T12269] dev_hard_start_xmit+0x21e/0xab0 [ 135.405490][T12269] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 135.411383][T12269] sch_direct_xmit+0x56c/0x18c0 [ 135.416225][T12269] __dev_queue_xmit+0x212d/0x4200 [ 135.421243][T12269] dev_queue_xmit+0x4b/0x60 [ 135.425743][T12269] ip_finish_output2+0x20d6/0x25d0 [ 135.430832][T12269] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 135.436877][T12269] ? nf_ct_deliver_cached_events+0x4d5/0x6e0 [ 135.442856][T12269] __ip_finish_output+0xaf8/0xda0 [ 135.447867][T12269] ip_finish_output+0x2db/0x420 [ 135.452712][T12269] ip_output+0x541/0x610 [ 135.456957][T12269] ? ip_mc_finish_output+0x6d0/0x6d0 [ 135.462221][T12269] ? ip_finish_output+0x420/0x420 [ 135.467225][T12269] __ip_queue_xmit+0x1caf/0x21f0 [ 135.472150][T12269] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 135.478026][T12269] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 135.484097][T12269] ip_queue_xmit+0xcc/0xf0 [ 135.488494][T12269] ? tcp_v4_inbound_md5_hash+0xd10/0xd10 [ 135.494106][T12269] __tcp_transmit_skb+0x40e3/0x5d90 [ 135.499332][T12269] __tcp_send_ack+0x701/0x840 [ 135.504002][T12269] tcp_send_ack+0x68/0x90 [ 135.508420][T12269] tcp_cleanup_rbuf+0x764/0x800 [ 135.513314][T12269] tcp_recvmsg+0x334d/0x4ff0 [ 135.517920][T12269] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 135.523884][T12269] ? tcp_mmap+0x150/0x150 [ 135.528196][T12269] ? tcp_mmap+0x150/0x150 [ 135.532527][T12269] inet_recvmsg+0x237/0x7d0 [ 135.537164][T12269] ? inet_sendpage+0x2c0/0x2c0 [ 135.541931][T12269] ? kmsan_get_shadow_origin_ptr+0x91/0x4b0 [ 135.547832][T12269] ? inet_sendpage+0x2c0/0x2c0 [ 135.552578][T12269] ? inet_sendpage+0x2c0/0x2c0 [ 135.557325][T12269] sock_read_iter+0x5be/0x660 [ 135.561993][T12269] ? kernel_sock_ip_overhead+0x340/0x340 [ 135.567604][T12269] __vfs_read+0xa67/0xc90 [ 135.571976][T12269] vfs_read+0x359/0x6f0 [ 135.576119][T12269] ksys_read+0x265/0x430 [ 135.580345][T12269] __se_sys_read+0x92/0xb0 [ 135.584744][T12269] __x64_sys_read+0x4a/0x70 [ 135.589224][T12269] do_syscall_64+0xb6/0x160 [ 135.593709][T12269] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 135.599578][T12269] RIP: 0033:0x47fd44 [ 135.603452][T12269] 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 [ 135.623037][T12269] RSP: 002b:000000c4203c3760 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 135.631444][T12269] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44 [ 135.639401][T12269] RDX: 0000000000001000 RSI: 000000c4203f6000 RDI: 0000000000000003 [ 135.647412][T12269] RBP: 000000c4203c37b0 R08: 0000000000000000 R09: 0000000000000000 [ 135.655364][T12269] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 [ 135.663319][T12269] R13: 0000000000000008 R14: 0000000000000004 R15: ffffffffffffffff [ 135.672617][T12269] Kernel Offset: disabled [ 135.676951][T12269] Rebooting in 86400 seconds..