commit ad17868eb162a5466d8ad43e5ccb428776403308
author Richard Henderson <richard.henderson@linaro.org> Wed Jul 26 12:58:08 2023 -0700
committer Richard Henderson <richard.henderson@linaro.org> Mon Jul 31 12:19:13 2023 -0700
tree 0aa1f1fb3bfcdf628be51dc978fc2cf00ed69842
parent 79e29851bf57741252a20838cdc59074ab5bac29

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

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: deba78709ae8 ("accel/tcg: Always lock pages before translation")
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>