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accel/tcg: Clear tcg_ctx->gen_tb on buffer overflow

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On overflow of code_gen_buffer, we unlock the guest pages we had been
translating, but failed to clear gen_tb.  On restart, if we cannot
allocate a TB, we exit to the main loop to perform the flush of all
TBs as soon as possible.  With garbage in gen_tb, we hit an assert:

../src/accel/tcg/tb-maint.c:348:page_unlock__debug: \
    assertion failed: (page_is_locked(pd))

Fixes: deba78709a ("accel/tcg: Always lock pages before translation")
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-07-26 12:58:08 -07:00
parent 79e29851bf
commit ad17868eb1
1 changed files with 1 additions and 0 deletions
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accel/tcg/translate-all.c
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@ -374,6 +374,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
"Restarting code generation for "
"code_gen_buffer overflow\n");
tb_unlock_pages(tb);
tcg_ctx->gen_tb = NULL;
goto buffer_overflow;
case -2: