./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1965151432 <...> Warning: Permanently added '10.128.0.52' (ED25519) to the list of known hosts. execve("./syz-executor1965151432", ["./syz-executor1965151432"], 0x7ffc411ece30 /* 10 vars */) = 0 brk(NULL) = 0x555556856000 brk(0x555556856d00) = 0x555556856d00 arch_prctl(ARCH_SET_FS, 0x555556856380) = 0 set_tid_address(0x555556856650) = 4998 set_robust_list(0x555556856660, 24) = 0 rseq(0x555556856ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor1965151432", 4096) = 28 getrandom("\x56\xf5\x5b\x66\x9d\xfa\x64\x91", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555556856d00 brk(0x555556877d00) = 0x555556877d00 brk(0x555556878000) = 0x555556878000 mprotect(0x7f2833a04000, 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, child_tidptr=0x555556856650) = 4999 ./strace-static-x86_64: Process 4999 attached [pid 4999] set_robust_list(0x555556856660, 24) = 0 [pid 4999] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 4999] setpgid(0, 0) = 0 [pid 4999] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 4999] write(3, "1000", 4) = 4 [pid 4999] close(3) = 0 [pid 4999] socket(AF_VSOCK, SOCK_SEQPACKET, 0) = 3 [ 145.805454][ T8] ===================================================== [ 145.813695][ T8] BUG: KMSAN: uninit-value in virtio_transport_recv_pkt+0x1c42/0x2580 [ 145.822289][ T8] virtio_transport_recv_pkt+0x1c42/0x2580 [ 145.828319][ T8] vsock_loopback_work+0x3e2/0x5d0 [ 145.833777][ T8] process_scheduled_works+0x104e/0x1e70 [ 145.839592][ T8] worker_thread+0xf45/0x1490 [ 145.844607][ T8] kthread+0x3e8/0x540 [ 145.848881][ T8] ret_from_fork+0x66/0x80 [ 145.853694][ T8] ret_from_fork_asm+0x11/0x20 [ 145.858646][ T8] [ 145.861171][ T8] Uninit was stored to memory at: [ 145.866421][ T8] virtio_transport_recv_pkt+0x1ea4/0x2580 [ 145.872612][ T8] vsock_loopback_work+0x3e2/0x5d0 [ 145.877925][ T8] process_scheduled_works+0x104e/0x1e70 [ 145.883904][ T8] worker_thread+0xf45/0x1490 [ 145.888713][ T8] kthread+0x3e8/0x540 [ 145.893028][ T8] ret_from_fork+0x66/0x80 [ 145.897898][ T8] ret_from_fork_asm+0x11/0x20 [ 145.902909][ T8] [ 145.905321][ T8] Uninit was created at: [ 145.910065][ T8] slab_post_alloc_hook+0x12f/0xb70 [ 145.915440][ T8] kmem_cache_alloc_node+0x577/0xa80 [ 145.921016][ T8] kmalloc_reserve+0x13d/0x4a0 [ 145.925972][ T8] __alloc_skb+0x318/0x740 [ 145.930758][ T8] virtio_transport_alloc_skb+0x8b/0x1170 [ 145.936684][ T8] virtio_transport_recv_pkt+0x1531/0x2580 [ 145.942842][ T8] vsock_loopback_work+0x3e2/0x5d0 [ 145.948129][ T8] process_scheduled_works+0x104e/0x1e70 [ 145.954027][ T8] worker_thread+0xf45/0x1490 [ 145.958837][ T8] kthread+0x3e8/0x540 [ 145.963171][ T8] ret_from_fork+0x66/0x80 [ 145.967769][ T8] ret_from_fork_asm+0x11/0x20 [ 145.972785][ T8] [ 145.975184][ T8] CPU: 0 PID: 8 Comm: kworker/0:0 Not tainted 6.6.0-rc2-syzkaller-00337-gd90b0276af8f #0 [ 145.985250][ T8] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 [ 145.995549][ T8] Workqueue: vsock-loopback vsock_loopback_work [ 146.002195][ T8] ===================================================== [ 146.009206][ T8] Disabling lock debugging due to kernel taint [ 146.015629][ T8] Kernel panic - not syncing: kmsan.panic set ... [ 146.022158][ T8] CPU: 0 PID: 8 Comm: kworker/0:0 Tainted: G B 6.6.0-rc2-syzkaller-00337-gd90b0276af8f #0 [ 146.033598][ T8] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 [ 146.043760][ T8] Workqueue: vsock-loopback vsock_loopback_work [ 146.050229][ T8] Call Trace: [ 146.053582][ T8] [ 146.056582][ T8] dump_stack_lvl+0x1bf/0x240 [ 146.061422][ T8] dump_stack+0x1e/0x20 [ 146.065699][ T8] panic+0x4d5/0xc70 [ 146.069815][ T8] ? add_taint+0x108/0x1a0 [ 146.074397][ T8] kmsan_report+0x2d0/0x2d0 [ 146.079090][ T8] ? free_to_partial_list+0x504/0x1c50 [ 146.084743][ T8] ? __msan_warning+0x96/0x110 [ 146.089822][ T8] ? virtio_transport_recv_pkt+0x1c42/0x2580 [ 146.096010][ T8] ? vsock_loopback_work+0x3e2/0x5d0 [ 146.101476][ T8] ? process_scheduled_works+0x104e/0x1e70 [ 146.107410][ T8] ? worker_thread+0xf45/0x1490 [ 146.112392][ T8] ? kthread+0x3e8/0x540 [ 146.116734][ T8] ? ret_from_fork+0x66/0x80 [ 146.121435][ T8] ? ret_from_fork_asm+0x11/0x20 [ 146.126501][ T8] ? ret_from_fork_asm+0x11/0x20 [ 146.131628][ T8] ? kmsan_get_shadow_origin_ptr+0x4d/0xa0 [ 146.137581][ T8] ? virtio_transport_recv_pkt+0x7f/0x2580 [ 146.143601][ T8] ? kmsan_get_shadow_origin_ptr+0x4d/0xa0 [ 146.149578][ T8] ? kmsan_internal_set_shadow_origin+0x66/0xe0 [ 146.155974][ T8] ? kmsan_internal_set_shadow_origin+0x66/0xe0 [ 146.162327][ T8] ? kmsan_get_shadow_origin_ptr+0x4d/0xa0 [ 146.168240][ T8] __msan_warning+0x96/0x110 [ 146.172927][ T8] virtio_transport_recv_pkt+0x1c42/0x2580 [ 146.178924][ T8] vsock_loopback_work+0x3e2/0x5d0 [ 146.184344][ T8] ? vsock_loopback_send_pkt+0x1c0/0x1c0 [ 146.190136][ T8] process_scheduled_works+0x104e/0x1e70 [ 146.195937][ T8] worker_thread+0xf45/0x1490 [ 146.200815][ T8] kthread+0x3e8/0x540 [ 146.205073][ T8] ? pr_cont_work+0xce0/0xce0 [ 146.209918][ T8] ? kthread_blkcg+0x120/0x120 [ 146.214838][ T8] ret_from_fork+0x66/0x80 [ 146.219407][ T8] ? kthread_blkcg+0x120/0x120 [ 146.224337][ T8] ret_from_fork_asm+0x11/0x20 [ 146.229309][ T8] [ 146.232861][ T8] Kernel Offset: disabled [ 146.237251][ T8] Rebooting in 86400 seconds..