./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor4061519923 <...> Warning: Permanently added '10.128.1.71' (ECDSA) to the list of known hosts. execve("./syz-executor4061519923", ["./syz-executor4061519923"], 0x7ffe61675820 /* 10 vars */) = 0 brk(NULL) = 0x5555560f3000 brk(0x5555560f3c40) = 0x5555560f3c40 arch_prctl(ARCH_SET_FS, 0x5555560f3300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor4061519923", 4096) = 28 brk(0x555556114c40) = 0x555556114c40 brk(0x555556115000) = 0x555556115000 mprotect(0x7f993e283000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 4955 attached , child_tidptr=0x5555560f35d0) = 4955 [pid 4955] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 4955] setpgid(0, 0) = 0 [pid 4955] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 4955] write(3, "1000", 4) = 4 [pid 4955] close(3) = 0 [pid 4955] socket(AF_VSOCK, SOCK_STREAM, 0) = 3 [ 180.617406][ T39] ===================================================== [ 180.624779][ T39] BUG: KMSAN: uninit-value in virtio_transport_recv_pkt+0x1c42/0x2580 [ 180.633300][ T39] virtio_transport_recv_pkt+0x1c42/0x2580 [ 180.639357][ T39] vsock_loopback_work+0x3e2/0x5d0 [ 180.644781][ T39] process_one_work+0xb0d/0x1410 [ 180.649881][ T39] worker_thread+0x107e/0x1d60 [ 180.654884][ T39] kthread+0x3e8/0x540 [ 180.659152][ T39] ret_from_fork+0x1f/0x30 [ 180.663979][ T39] [ 180.666387][ T39] Uninit was stored to memory at: [ 180.671657][ T39] virtio_transport_recv_pkt+0x1ea4/0x2580 [ 180.677853][ T39] vsock_loopback_work+0x3e2/0x5d0 [ 180.683349][ T39] process_one_work+0xb0d/0x1410 [ 180.688460][ T39] worker_thread+0x107e/0x1d60 [ 180.693482][ T39] kthread+0x3e8/0x540 [ 180.697748][ T39] ret_from_fork+0x1f/0x30 [ 180.702450][ T39] [ 180.704875][ T39] Uninit was created at: [ 180.709281][ T39] slab_post_alloc_hook+0x12d/0xb60 [ 180.714772][ T39] kmem_cache_alloc_node+0x535/0xa30 [ 180.720244][ T39] kmalloc_reserve+0x148/0x470 [ 180.725405][ T39] __alloc_skb+0x318/0x740 [ 180.730012][ T39] virtio_transport_alloc_skb+0x8b/0x1170 [ 180.736040][ T39] virtio_transport_recv_pkt+0x1531/0x2580 [ 180.742101][ T39] vsock_loopback_work+0x3e2/0x5d0 [ 180.747402][ T39] process_one_work+0xb0d/0x1410 [ 180.752647][ T39] worker_thread+0x107e/0x1d60 [ 180.757590][ T39] kthread+0x3e8/0x540 [ 180.761976][ T39] ret_from_fork+0x1f/0x30 [ 180.766594][ T39] [ 180.768969][ T39] CPU: 1 PID: 39 Comm: kworker/1:1 Not tainted 6.4.0-rc6-syzkaller-g7cccf3be6dcb #0 [ 180.778635][ T39] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 [ 180.789001][ T39] Workqueue: vsock-loopback vsock_loopback_work [ 180.795603][ T39] ===================================================== [ 180.802684][ T39] Disabling lock debugging due to kernel taint [ 180.808900][ T39] Kernel panic - not syncing: kmsan.panic set ... [ 180.815384][ T39] CPU: 1 PID: 39 Comm: kworker/1:1 Tainted: G B 6.4.0-rc6-syzkaller-g7cccf3be6dcb #0 [ 180.826379][ T39] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 [ 180.836587][ T39] Workqueue: vsock-loopback vsock_loopback_work [ 180.843072][ T39] Call Trace: [ 180.846442][ T39] [ 180.849463][ T39] dump_stack_lvl+0x1bf/0x240 [ 180.854373][ T39] dump_stack+0x1e/0x20 [ 180.858736][ T39] panic+0x4d5/0xc70 [ 180.862806][ T39] ? add_taint+0x108/0x1a0 [ 180.867390][ T39] kmsan_report+0x2d0/0x2d0 [ 180.872058][ T39] ? perf_trace_kmsan_exceed_max_origin_depth+0x14/0xb0 [ 180.879193][ T39] ? __msan_warning+0x96/0x110 [ 180.884153][ T39] ? virtio_transport_recv_pkt+0x1c42/0x2580 [ 180.890270][ T39] ? vsock_loopback_work+0x3e2/0x5d0 [ 180.895707][ T39] ? process_one_work+0xb0d/0x1410 [ 180.900994][ T39] ? worker_thread+0x107e/0x1d60 [ 180.906059][ T39] ? kthread+0x3e8/0x540 [ 180.910511][ T39] ? ret_from_fork+0x1f/0x30 [ 180.915289][ T39] ? ret_from_fork+0x1f/0x30 [ 180.920011][ T39] ? kmsan_get_shadow_origin_ptr+0x4d/0xa0 [ 180.925969][ T39] ? virtio_transport_recv_pkt+0x7f/0x2580 [ 180.931944][ T39] ? kmsan_get_shadow_origin_ptr+0x4d/0xa0 [ 180.937980][ T39] ? virtio_transport_recv_pkt+0x7f/0x2580 [ 180.943965][ T39] ? kmsan_internal_set_shadow_origin+0x66/0xe0 [ 180.950463][ T39] ? kmsan_internal_set_shadow_origin+0x66/0xe0 [ 180.956913][ T39] ? kmsan_get_shadow_origin_ptr+0x4d/0xa0 [ 180.963780][ T39] __msan_warning+0x96/0x110 [ 180.968557][ T39] virtio_transport_recv_pkt+0x1c42/0x2580 [ 180.974640][ T39] vsock_loopback_work+0x3e2/0x5d0 [ 180.980023][ T39] ? vsock_loopback_send_pkt+0x1c0/0x1c0 [ 180.985889][ T39] process_one_work+0xb0d/0x1410 [ 180.991033][ T39] worker_thread+0x107e/0x1d60 [ 180.995932][ T39] ? kmsan_get_shadow_origin_ptr+0x4d/0xa0 [ 181.001933][ T39] ? __kthread_parkme+0xe0/0x1e0 [ 181.007073][ T39] kthread+0x3e8/0x540 [ 181.011376][ T39] ? pr_cont_work+0xce0/0xce0 [ 181.016250][ T39] ? kthread_blkcg+0x120/0x120 [ 181.021305][ T39] ret_from_fork+0x1f/0x30 [ 181.025870][ T39] [ 181.029063][ T39] Kernel Offset: disabled [ 181.033473][ T39] Rebooting in 86400 seconds..