[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 62.687312] audit: type=1800 audit(1542798532.749:25): pid=6563 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.706523] audit: type=1800 audit(1542798532.749:26): pid=6563 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.725948] audit: type=1800 audit(1542798532.769:27): pid=6563 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.125' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 79.822594] ================================================================== [ 79.829995] BUG: KMSAN: uninit-value in __list_add_valid+0x2a3/0x460 [ 79.836483] CPU: 1 PID: 7736 Comm: syz-executor019 Not tainted 4.20.0-rc3+ #91 [ 79.843835] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.853195] Call Trace: [ 79.855783] dump_stack+0x32d/0x480 [ 79.859409] ? __list_add_valid+0x2a3/0x460 [ 79.863742] kmsan_report+0x19f/0x300 [ 79.867564] __msan_warning+0x76/0xc0 [ 79.871368] __list_add_valid+0x2a3/0x460 [ 79.875522] rdma_listen+0x782/0x10a0 [ 79.879335] ucma_listen+0x32d/0x560 [ 79.883054] ? ucma_connect+0xb00/0xb00 [ 79.887027] ucma_write+0x5f9/0x670 [ 79.890662] ? uverbs_disassociate_api+0x4e0/0x4e0 [ 79.895605] __vfs_write+0x1f4/0xb80 [ 79.899344] ? rw_verify_area+0x35e/0x580 [ 79.903514] vfs_write+0x4a3/0x8f0 [ 79.907099] __se_sys_write+0x17a/0x370 [ 79.911100] __x64_sys_write+0x4a/0x70 [ 79.915005] do_syscall_64+0xcf/0x110 [ 79.918818] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 79.924004] RIP: 0033:0x440fa9 [ 79.927191] Code: e8 cc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 79.946112] RSP: 002b:00007ffcfdcd7db8 EFLAGS: 00000207 ORIG_RAX: 0000000000000001 [ 79.953847] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440fa9 [ 79.961152] RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000003 [ 79.968460] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 79.975735] R10: 00000000004002c8 R11: 0000000000000207 R12: 0000000000013804 [ 79.983000] R13: 0000000000401f80 R14: 0000000000000000 R15: 0000000000000000 [ 79.990278] [ 79.991907] Uninit was created at: [ 79.995483] kmsan_internal_poison_shadow+0xc8/0x1c0 [ 80.000582] kmsan_kmalloc+0x98/0xf0 [ 80.004307] kmsan_slab_alloc+0xe/0x10 [ 80.008197] __kmalloc_node_track_caller+0xf62/0x14e0 [ 80.013382] __alloc_skb+0x42b/0xeb0 [ 80.017092] sk_stream_alloc_skb+0x236/0xe60 [ 80.021495] tcp_sendmsg_locked+0x2638/0x6c30 [ 80.025996] tcp_sendmsg+0xb2/0x100 [ 80.029664] inet_sendmsg+0x4e9/0x800 [ 80.033471] sock_write_iter+0x3f4/0x4f0 [ 80.037539] __vfs_write+0x888/0xb80 [ 80.041263] vfs_write+0x4a3/0x8f0 [ 80.044797] __se_sys_write+0x17a/0x370 [ 80.048764] __x64_sys_write+0x4a/0x70 [ 80.052647] do_syscall_64+0xcf/0x110 [ 80.056459] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 80.061638] ================================================================== [ 80.069006] Disabling lock debugging due to kernel taint [ 80.074458] Kernel panic - not syncing: panic_on_warn set ... [ 80.080356] CPU: 1 PID: 7736 Comm: syz-executor019 Tainted: G B 4.20.0-rc3+ #91 [ 80.089097] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 80.098456] Call Trace: [ 80.101061] dump_stack+0x32d/0x480 [ 80.104701] panic+0x624/0xc08 [ 80.107922] kmsan_report+0x300/0x300 [ 80.111749] __msan_warning+0x76/0xc0 [ 80.115572] __list_add_valid+0x2a3/0x460 [ 80.119754] rdma_listen+0x782/0x10a0 [ 80.123598] ucma_listen+0x32d/0x560 [ 80.127376] ? ucma_connect+0xb00/0xb00 [ 80.131354] ucma_write+0x5f9/0x670 [ 80.134992] ? uverbs_disassociate_api+0x4e0/0x4e0 [ 80.139918] __vfs_write+0x1f4/0xb80 [ 80.143637] ? rw_verify_area+0x35e/0x580 [ 80.147818] vfs_write+0x4a3/0x8f0 [ 80.151408] __se_sys_write+0x17a/0x370 [ 80.155407] __x64_sys_write+0x4a/0x70 [ 80.159295] do_syscall_64+0xcf/0x110 [ 80.163098] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 80.168286] RIP: 0033:0x440fa9 [ 80.171478] Code: e8 cc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 80.190394] RSP: 002b:00007ffcfdcd7db8 EFLAGS: 00000207 ORIG_RAX: 0000000000000001 [ 80.198120] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440fa9 [ 80.205415] RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000003 [ 80.212684] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 80.219951] R10: 00000000004002c8 R11: 0000000000000207 R12: 0000000000013804 [ 80.227244] R13: 0000000000401f80 R14: 0000000000000000 R15: 0000000000000000 [ 80.235452] Kernel Offset: disabled [ 80.239091] Rebooting in 86400 seconds..