[Bug 247020] [panic][lixux]: kernel panic in linux_thread_detach at /usr/src/sys/compat/linux/linux_fork.c:462

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247020

            Bug ID: 247020
           Summary: [panic][lixux]: kernel panic in linux_thread_detach at
                    /usr/src/sys/compat/linux/linux_fork.c:462
           Product: Base System
           Version: 12.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: freebsd at sysctl.cz

Hello,
when trying to execute linux binary with gdb debug then have
kernel panic immediately.

kldload linux64
gdb ./linux_binary
(gdb) run

Unread portion of the kernel message buffer:
panic: thread_detach: emuldata not found.

cpuid = 6
time = 1591381865
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0075872930
vpanic() at vpanic+0x19d/frame 0xfffffe0075872980
panic() at panic+0x43/frame 0xfffffe00758729e0
linux_thread_detach() at linux_thread_detach+0x9e/frame 0xfffffe0075872a30
thread_suspend_check() at thread_suspend_check+0x318/frame 0xfffffe0075872a70
ast() at ast+0x544/frame 0xfffffe0075872ab0
doreti_ast() at doreti_ast+0x1f/frame 0x7fffdfffdd90
Uptime: 4m46s
Dumping 814 out of 8042 MB:..2%..12%..22%..32%..42%..52%..61%..71%..81%..91%

__curthread () at /usr/src/sys/amd64/include/pcpu.h:234
234             __asm("movq %%gs:%P1,%0" : "=r" (td) : "n"
(OFFSETOF_CURTHREAD));
(kgdb) bt
#0  __curthread () at /usr/src/sys/amd64/include/pcpu.h:234
#1  doadump (textdump=1) at /usr/src/sys/kern/kern_shutdown.c:371
#2  0xffffffff80bb70b0 in kern_reboot (howto=260) at
/usr/src/sys/kern/kern_shutdown.c:451
#3  0xffffffff80bb74f9 in vpanic (fmt=<optimized out>, ap=<optimized out>) at
/usr/src/sys/kern/kern_shutdown.c:877
#4  0xffffffff80bb7263 in panic (fmt=<unavailable>) at
/usr/src/sys/kern/kern_shutdown.c:804
#5  0xffffffff82f4e1be in linux_thread_detach (td=0xfffff8017a48c5e0) at
/usr/src/sys/compat/linux/linux_fork.c:462
#6  0xffffffff80bcbfa8 in thread_suspend_check (return_instead=0) at
/usr/src/sys/kern/kern_thread.c:1010
#7  0xffffffff80c167c4 in ast (framep=0xfffffe0075872ac0) at
/usr/src/sys/kern/subr_trap.c:342
#8  0xffffffff810670f9 in doreti_ast () at
/usr/src/sys/amd64/amd64/exception.S:1149
#9  0x0000000800bb7008 in ?? ()
#10 0x000000000000000f in ?? ()
#11 0x0000000000000000 in ?? ()
(kgdb) list *0xffffffff82f4e1be
0xffffffff82f4e1be is at /usr/src/sys/compat/linux/linux_fork.c:462.
457             struct linux_emuldata *em;
458             int *child_clear_tid;
459             int error;
460     
461             em = em_find(td);
462             KASSERT(em != NULL, ("thread_detach: emuldata not found.\n"));
463     
464             LINUX_CTR1(thread_detach, "thread(%d)", em->em_tid);
465     
466             release_futexes(td, em);
(kgdb) 
467     
468             child_clear_tid = em->child_clear_tid;
469     
470             if (child_clear_tid != NULL) {
471     
472                     LINUX_CTR2(thread_detach, "thread(%d) %p",
473                         em->em_tid, child_clear_tid);
474     
475                     error = suword32(child_clear_tid, 0);
476                     if (error != 0)
(kgdb) list 
477                             return;
478     
479                     cup.uaddr = child_clear_tid;
480                     cup.op = LINUX_FUTEX_WAKE;
481                     cup.val = 1;            /* wake one */
482                     cup.timeout = NULL;
483                     cup.uaddr2 = NULL;
484                     cup.val3 = 0;
485                     error = linux_sys_futex(td, &cup);
486                     /*

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