./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3433124421 <...> Warning: Permanently added '10.128.0.21' (ED25519) to the list of known hosts. execve("./syz-executor3433124421", ["./syz-executor3433124421"], 0x7ffef3409e30 /* 10 vars */) = 0 brk(NULL) = 0x5555734fc000 brk(0x5555734fcd00) = 0x5555734fcd00 arch_prctl(ARCH_SET_FS, 0x5555734fc380) = 0 set_tid_address(0x5555734fc650) = 5811 set_robust_list(0x5555734fc660, 24) = 0 rseq(0x5555734fcca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor3433124421", 4096) = 28 getrandom("\x96\xdf\x6f\x35\x94\x78\xb1\x82", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555734fcd00 brk(0x55557351dd00) = 0x55557351dd00 brk(0x55557351e000) = 0x55557351e000 mprotect(0x7fca8b4ab000, 16384, PROT_READ) = 0 mmap(0x1ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffffffff000 mmap(0x200000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200000000000 mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5812 attached , child_tidptr=0x5555734fc650) = 5812 [pid 5812] set_robust_list(0x5555734fc660, 24) = 0 [pid 5812] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5812] setpgid(0, 0) = 0 [pid 5812] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5812] write(3, "1000", 4) = 4 [pid 5812] close(3) = 0 [pid 5812] write(1, "executing program\n", 18) = 18 [pid 5812] socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTEexecuting program ) = 3 [pid 5812] ioctl(3, SIOCGIFINDEX, {ifr_name="lo", ifr_ifindex=1}) = 0 [pid 5812] sendmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\x4c\x00\x00\x00\x24\x00\x41\x65\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\x00\x00\xf3\xff\x0a\x00\x01\x00\x6e\x65\x74\x65\x6d\x00\x00\x00\x1c\x00\x02\x00\x06\x00\x00\x00\x0b\x00\x00\x00\x80\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\xb1\x91\x00\x00", iov_len=76}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_SYN|MSG_ZEROCOPY}, 0) = 76 [pid 5812] socket(AF_INET6, SOCK_STREAM, IPPROTO_SCTP) = 4 [pid 5812] setsockopt(4, SOL_SCTP, SCTP_PEER_ADDR_PARAMS, "\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 156) = 0 [pid 5812] bind(4, {sa_family=AF_INET6, sin6_port=htons(20003), sin6_flowinfo=htonl(0), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_scope_id=0}, 28) = 0 [ 173.968906][ T5812] ===================================================== [ 173.976618][ T5812] BUG: KMSAN: uninit-value in sctp_assoc_bh_rcv+0x34e/0xbc0 [ 173.984224][ T5812] sctp_assoc_bh_rcv+0x34e/0xbc0 [ 173.989344][ T5812] sctp_inq_push+0x2a3/0x350 [ 173.994178][ T5812] sctp_backlog_rcv+0x3c7/0xda0 [ 173.999215][ T5812] sk_backlog_rcv+0x142/0x420 [ 174.004188][ T5812] __release_sock+0x1d3/0x330 [ 174.009019][ T5812] release_sock+0x6b/0x270 [ 174.013675][ T5812] sctp_wait_for_connect+0x458/0x820 [ 174.019148][ T5812] sctp_sendmsg_to_asoc+0x223a/0x2260 [ 174.024779][ T5812] sctp_sendmsg+0x3910/0x49f0 [ 174.029608][ T5812] inet_sendmsg+0x269/0x2a0 [ 174.034357][ T5812] __sock_sendmsg+0x278/0x3d0 [ 174.039204][ T5812] __sys_sendto+0x593/0x720 [ 174.043887][ T5812] __x64_sys_sendto+0x130/0x200 [ 174.048879][ T5812] x64_sys_call+0x3c0b/0x3db0 [ 174.053784][ T5812] do_syscall_64+0xd9/0x210 [ 174.058435][ T5812] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 174.064522][ T5812] [ 174.066917][ T5812] Uninit was created at: [ 174.071296][ T5812] __kmalloc_node_track_caller_noprof+0x96d/0x12f0 [ 174.078019][ T5812] kmalloc_reserve+0x22f/0x4b0 [ 174.083074][ T5812] __alloc_skb+0x347/0x7d0 [ 174.087704][ T5812] sctp_packet_transmit+0x18a1/0x46d0 [ 174.093275][ T5812] sctp_outq_flush+0x1c7d/0x67c0 [ 174.098378][ T5812] sctp_outq_uncork+0x9e/0xc0 [ 174.103306][ T5812] sctp_do_sm+0x8c8e/0x9720 [ 174.107997][ T5812] sctp_assoc_bh_rcv+0x88b/0xbc0 [ 174.113149][ T5812] sctp_inq_push+0x2a3/0x350 [ 174.117896][ T5812] sctp_backlog_rcv+0x3c7/0xda0 [ 174.122945][ T5812] sk_backlog_rcv+0x142/0x420 [ 174.127798][ T5812] __release_sock+0x1d3/0x330 [ 174.132680][ T5812] release_sock+0x6b/0x270 [ 174.137285][ T5812] sctp_wait_for_connect+0x458/0x820 [ 174.142874][ T5812] sctp_sendmsg_to_asoc+0x223a/0x2260 [ 174.148401][ T5812] sctp_sendmsg+0x3910/0x49f0 [ 174.153279][ T5812] inet_sendmsg+0x269/0x2a0 [ 174.157977][ T5812] __sock_sendmsg+0x278/0x3d0 [ 174.164010][ T5812] __sys_sendto+0x593/0x720 [ 174.168645][ T5812] __x64_sys_sendto+0x130/0x200 [ 174.173715][ T5812] x64_sys_call+0x3c0b/0x3db0 [ 174.178574][ T5812] do_syscall_64+0xd9/0x210 [ 174.183287][ T5812] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 174.189336][ T5812] [ 174.191735][ T5812] CPU: 0 UID: 0 PID: 5812 Comm: syz-executor343 Not tainted 6.16.0-rc7-syzkaller-00140-gec2df4364666 #0 PREEMPT(none) [ 174.204416][ T5812] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 [ 174.214678][ T5812] ===================================================== [ 174.221703][ T5812] Disabling lock debugging due to kernel taint [ 174.228062][ T5812] Kernel panic - not syncing: kmsan.panic set ... [ 174.234649][ T5812] CPU: 0 UID: 0 PID: 5812 Comm: syz-executor343 Tainted: G B 6.16.0-rc7-syzkaller-00140-gec2df4364666 #0 PREEMPT(none) [ 174.248917][ T5812] Tainted: [B]=BAD_PAGE [ 174.253143][ T5812] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 [ 174.263293][ T5812] Call Trace: [ 174.266636][ T5812] [ 174.269628][ T5812] __dump_stack+0x26/0x30 [ 174.274077][ T5812] dump_stack_lvl+0x53/0x270 [ 174.278801][ T5812] ? kmsan_get_shadow_origin_ptr+0x4a/0xb0 [ 174.284782][ T5812] dump_stack+0x1e/0x25 [ 174.289062][ T5812] panic+0x4bd/0xd50 [ 174.293104][ T5812] kmsan_report+0x31c/0x320 [ 174.297703][ T5812] ? __msan_warning+0x1b/0x30 [ 174.302485][ T5812] ? sctp_assoc_bh_rcv+0x34e/0xbc0 [ 174.307773][ T5812] ? sctp_inq_push+0x2a3/0x350 [ 174.312667][ T5812] ? sctp_backlog_rcv+0x3c7/0xda0 [ 174.317801][ T5812] ? sk_backlog_rcv+0x142/0x420 [ 174.322776][ T5812] ? __release_sock+0x1d3/0x330 [ 174.327739][ T5812] ? release_sock+0x6b/0x270 [ 174.332457][ T5812] ? sctp_wait_for_connect+0x458/0x820 [ 174.338024][ T5812] ? sctp_sendmsg_to_asoc+0x223a/0x2260 [ 174.343671][ T5812] ? sctp_sendmsg+0x3910/0x49f0 [ 174.348643][ T5812] ? inet_sendmsg+0x269/0x2a0 [ 174.353491][ T5812] ? __sock_sendmsg+0x278/0x3d0 [ 174.358451][ T5812] ? __sys_sendto+0x593/0x720 [ 174.363220][ T5812] ? __x64_sys_sendto+0x130/0x200 [ 174.368338][ T5812] ? x64_sys_call+0x3c0b/0x3db0 [ 174.373302][ T5812] ? do_syscall_64+0xd9/0x210 [ 174.378072][ T5812] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 174.384238][ T5812] ? kmsan_internal_set_shadow_origin+0x79/0x110 [ 174.390708][ T5812] ? kmsan_internal_unpoison_memory+0x14/0x20 [ 174.396910][ T5812] ? kmsan_get_metadata+0xfb/0x160 [ 174.402148][ T5812] ? kmsan_get_shadow_origin_ptr+0x4a/0xb0 [ 174.408077][ T5812] ? kmsan_get_metadata+0xfb/0x160 [ 174.413292][ T5812] ? kmsan_get_shadow_origin_ptr+0x4a/0xb0 [ 174.419205][ T5812] ? sctp_inq_pop+0x15ea/0x19e0 [ 174.424167][ T5812] ? kmsan_get_metadata+0xfb/0x160 [ 174.429425][ T5812] __msan_warning+0x1b/0x30 [ 174.434014][ T5812] sctp_assoc_bh_rcv+0x34e/0xbc0 [ 174.439125][ T5812] ? __pfx_sctp_assoc_bh_rcv+0x10/0x10 [ 174.444754][ T5812] sctp_inq_push+0x2a3/0x350 [ 174.449460][ T5812] sctp_backlog_rcv+0x3c7/0xda0 [ 174.454433][ T5812] ? kmsan_get_metadata+0xfb/0x160 [ 174.459650][ T5812] ? __pfx_sctp_backlog_rcv+0x10/0x10 [ 174.465143][ T5812] sk_backlog_rcv+0x142/0x420 [ 174.469953][ T5812] __release_sock+0x1d3/0x330 [ 174.474752][ T5812] release_sock+0x6b/0x270 [ 174.479328][ T5812] sctp_wait_for_connect+0x458/0x820 [ 174.484751][ T5812] ? __pfx_autoremove_wake_function+0x10/0x10 [ 174.491027][ T5812] sctp_sendmsg_to_asoc+0x223a/0x2260 [ 174.496536][ T5812] ? kmsan_get_metadata+0xfb/0x160 [ 174.501799][ T5812] ? kmsan_get_shadow_origin_ptr+0x4a/0xb0 [ 174.507777][ T5812] sctp_sendmsg+0x3910/0x49f0 [ 174.512613][ T5812] ? kmsan_internal_set_shadow_origin+0x10/0x110 [ 174.519166][ T5812] ? __pfx_sctp_sendmsg+0x10/0x10 [ 174.524353][ T5812] inet_sendmsg+0x269/0x2a0 [ 174.528968][ T5812] __sock_sendmsg+0x278/0x3d0 [ 174.533770][ T5812] __sys_sendto+0x593/0x720 [ 174.538552][ T5812] ? kmsan_internal_set_shadow_origin+0x79/0x110 [ 174.545023][ T5812] ? kmsan_internal_unpoison_memory+0x14/0x20 [ 174.551225][ T5812] ? ptrace_notify+0x25b/0x320 [ 174.556126][ T5812] __x64_sys_sendto+0x130/0x200 [ 174.561113][ T5812] x64_sys_call+0x3c0b/0x3db0 [ 174.565932][ T5812] do_syscall_64+0xd9/0x210 [ 174.570530][ T5812] ? irqentry_exit+0x16/0x60 [ 174.575201][ T5812] ? clear_bhb_loop+0x40/0x90 [ 174.579980][ T5812] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 174.585974][ T5812] RIP: 0033:0x7fca8b437cf9 [ 174.590471][ T5812] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 174.610217][ T5812] RSP: 002b:00007ffd88a1dbe8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 174.618803][ T5812] RAX: ffffffffffffffda RBX: 0100000000000000 RCX: 00007fca8b437cf9 [ 174.626866][ T5812] RDX: 000000000000fee4 RSI: 0000200000847fff RDI: 0000000000000004 [ 174.634921][ T5812] RBP: 0000000000000000 R08: 000020000005ffe4 R09: 000000000000001c [ 174.642967][ T5812] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 174.651013][ T5812] R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001 [ 174.659088][ T5812] [ 174.662370][ T5812] Kernel Offset: disabled [ 174.666759][ T5812] Rebooting in 86400 seconds..