[Bug 262587] panic: lock (sleep mutex) umtxql not locked @ /usr/src/sys/sys/umtxvar.h:262 on 14-current master-n253798-8cdecdecb43

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262587

--- Comment #8 from Masachika ISHIZUKA <ish@amail.plala.or.jp> ---
Created attachment 232568
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=232568&action=edit
Attached core.txt.3 file is output of patched linux_futex.c

carrot% diff -ruN linux_futex.c.org linux_futex.c
--- linux_futex.c.org   2021-08-17 09:38:11.416807000 +0900
+++ linux_futex.c       2022-03-19 07:05:43.100300000 +0900
@@ -197,6 +197,9 @@
        struct linux_pemuldata *pem;
        struct proc *p;

+#if 1
+       printf("DEBUG:linux futex op %d\n", args->op);
+#endif
        if (args->op & LINUX_FUTEX_PRIVATE_FLAG) {
                args->flags = 0;
                args->op &= ~LINUX_FUTEX_PRIVATE_FLAG;

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