./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2895456368 <...> Warning: Permanently added '10.128.1.24' (ECDSA) to the list of known hosts. execve("./syz-executor2895456368", ["./syz-executor2895456368"], 0x7ffc6bd4f830 /* 10 vars */) = 0 brk(NULL) = 0x55555729f000 brk(0x55555729fc40) = 0x55555729fc40 arch_prctl(ARCH_SET_FS, 0x55555729f300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor2895456368", 4096) = 28 brk(0x5555572c0c40) = 0x5555572c0c40 brk(0x5555572c1000) = 0x5555572c1000 mprotect(0x7fd42cf4f000, 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=0x55555729f5d0) = 3487 ./strace-static-x86_64: Process 3487 attached [pid 3487] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 3487] setpgid(0, 0) = 0 [pid 3487] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 3487] write(3, "1000", 4) = 4 [pid 3487] close(3) = 0 [pid 3487] socket(AF_INET6, SOCK_DGRAM, IPPROTO_IP) = 3 [pid 3487] connect(3, {sa_family=AF_INET6, sin6_port=htons(20003), sin6_flowinfo=htonl(0), inet_pton(AF_INET6, "::ffff:172.20.20.187", &sin6_addr), sin6_scope_id=0}, 28) = 0 [ 113.068412][ T3487] ===================================================== [ 113.075743][ T3487] BUG: KMSAN: uninit-value in bcmp+0xbf/0x1c0 [ 113.081942][ T3487] bcmp+0xbf/0x1c0 [ 113.085969][ T3487] ____sys_sendmsg+0x7f3/0xe90 [ 113.090859][ T3487] ___sys_sendmsg+0x2a1/0x3f0 [ 113.095777][ T3487] __sys_sendmmsg+0x40d/0xa40 [ 113.100579][ T3487] __x64_sys_sendmmsg+0xb8/0x120 [ 113.105746][ T3487] do_syscall_64+0x3d/0xb0 [ 113.110292][ T3487] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 113.116509][ T3487] [ 113.118883][ T3487] Uninit was stored to memory at: [ 113.124199][ T3487] ____sys_sendmsg+0xc46/0xe90 [ 113.129094][ T3487] ___sys_sendmsg+0x2a1/0x3f0 [ 113.134054][ T3487] __sys_sendmmsg+0x40d/0xa40 [ 113.138841][ T3487] __x64_sys_sendmmsg+0xb8/0x120 [ 113.144054][ T3487] do_syscall_64+0x3d/0xb0 [ 113.148604][ T3487] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 113.155243][ T3487] [ 113.157625][ T3487] Local variable sin created at: [ 113.162605][ T3487] udpv6_sendmsg+0x56/0x4440 [ 113.167429][ T3487] inet6_sendmsg+0x101/0x180 [ 113.172149][ T3487] [ 113.174586][ T3487] CPU: 1 PID: 3487 Comm: syz-executor289 Not tainted 6.0.0-rc5-syzkaller-48539-g523d2ce66d07 #0 [ 113.185236][ T3487] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 [ 113.195542][ T3487] ===================================================== [ 113.202556][ T3487] Disabling lock debugging due to kernel taint [ 113.208897][ T3487] Kernel panic - not syncing: kmsan.panic set ... [ 113.215387][ T3487] CPU: 1 PID: 3487 Comm: syz-executor289 Tainted: G B 6.0.0-rc5-syzkaller-48539-g523d2ce66d07 #0 [ 113.227395][ T3487] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 [ 113.237543][ T3487] Call Trace: [ 113.240870][ T3487] [ 113.243882][ T3487] dump_stack_lvl+0x1c8/0x256 [ 113.248720][ T3487] dump_stack+0x1a/0x1c [ 113.252984][ T3487] panic+0x4d3/0xc69 [ 113.257047][ T3487] kmsan_report+0x2cc/0x2d0 [ 113.261693][ T3487] ? __msan_warning+0x92/0x110 [ 113.266566][ T3487] ? bcmp+0xbf/0x1c0 [ 113.270582][ T3487] ? ____sys_sendmsg+0x7f3/0xe90 [ 113.275656][ T3487] ? ___sys_sendmsg+0x2a1/0x3f0 [ 113.280621][ T3487] ? __sys_sendmmsg+0x40d/0xa40 [ 113.285563][ T3487] ? __x64_sys_sendmmsg+0xb8/0x120 [ 113.290806][ T3487] ? do_syscall_64+0x3d/0xb0 [ 113.295508][ T3487] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 113.301682][ T3487] ? kmsan_internal_chain_origin+0x4f/0xc0 [ 113.307634][ T3487] ? __msan_chain_origin+0xbd/0x140 [ 113.312987][ T3487] ? ____sys_sendmsg+0xe47/0xe90 [ 113.318041][ T3487] ? ___sys_sendmsg+0x2a1/0x3f0 [ 113.322984][ T3487] ? __sys_sendmmsg+0x40d/0xa40 [ 113.327968][ T3487] ? __x64_sys_sendmmsg+0xb8/0x120 [ 113.333197][ T3487] ? do_syscall_64+0x3d/0xb0 [ 113.337885][ T3487] ? entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 113.344118][ T3487] ? memcg_slab_post_alloc_hook+0x2d/0x980 [ 113.350039][ T3487] ? kmsan_get_shadow_origin_ptr+0x49/0xa0 [ 113.355957][ T3487] ? kmsan_get_shadow_origin_ptr+0x49/0xa0 [ 113.361909][ T3487] ? kmsan_get_shadow_origin_ptr+0x49/0xa0 [ 113.367907][ T3487] ? should_fail+0x3f/0x810 [ 113.372555][ T3487] ? kmsan_get_shadow_origin_ptr+0x49/0xa0 [ 113.378575][ T3487] __msan_warning+0x92/0x110 [ 113.383307][ T3487] bcmp+0xbf/0x1c0 [ 113.387118][ T3487] ____sys_sendmsg+0x7f3/0xe90 [ 113.392018][ T3487] ___sys_sendmsg+0x2a1/0x3f0 [ 113.396804][ T3487] ? __schedule+0x1609/0x21d0 [ 113.401606][ T3487] ? kmsan_get_shadow_origin_ptr+0x49/0xa0 [ 113.407516][ T3487] ? __cond_resched+0x1f/0x40 [ 113.412294][ T3487] ? preempt_schedule_common+0x117/0x180 [ 113.418059][ T3487] __sys_sendmmsg+0x40d/0xa40 [ 113.422857][ T3487] ? preempt_count_sub+0x7d/0x280 [ 113.428034][ T3487] ? _raw_spin_unlock_irq+0x26/0x40 [ 113.433340][ T3487] ? kmsan_get_shadow_origin_ptr+0x49/0xa0 [ 113.439293][ T3487] __x64_sys_sendmmsg+0xb8/0x120 [ 113.444346][ T3487] do_syscall_64+0x3d/0xb0 [ 113.448844][ T3487] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 113.454874][ T3487] RIP: 0033:0x7fd42cee2e59 [ 113.459381][ T3487] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 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 c0 ff ff ff f7 d8 64 89 01 48 [ 113.479085][ T3487] RSP: 002b:00007ffc5c3507c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 113.487599][ T3487] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd42cee2e59 [ 113.495643][ T3487] RDX: 0000000000000002 RSI: 0000000020000300 RDI: 0000000000000003 [ 113.503693][ T3487] RBP: 0000000000000000 R08: 00007ffc5c350968 R09: 00007ffc5c350968 [ 113.511784][ T3487] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd42cea66e0 [ 113.519894][ T3487] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 [ 113.527950][ T3487] [ 113.531191][ T3487] Kernel Offset: disabled [ 113.535568][ T3487] Rebooting in 86400 seconds..