** Changed in: qemu
Status: New => In Progress
** Changed in: qemu
Assignee: (unassigned) => Richard Henderson (rth)
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https://bugs.launchpad.net/bugs/1912065
Title:
Segfaults in tcg/optimize.c:212 after commit
7c79721606be11b5bc556449e5bcbc331ef6867d
Status in QEMU:
In Progress
Bug description:
QEMU segfaults to NULL dereference in tcg/optimize.c:212 semi-randomly
after commit 7c79721606be11b5bc556449e5bcbc331ef6867d
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000020
Exception Note: EXC_CORPSE_NOTIFY
...
Thread 4 Crashed:
0 qemu-system-ppc 0x0000000109cd26d2 tcg_opt_gen_mov +
178 (optimize.c:212)
1 qemu-system-ppc 0x0000000109ccf838 tcg_optimize + 5656
2 qemu-system-ppc 0x0000000109c27600 tcg_gen_code + 64
(tcg.c:4490)
3 qemu-system-ppc 0x0000000109c17b6d tb_gen_code + 493
(translate-all.c:1952)
4 qemu-system-ppc 0x0000000109c16085 tb_find + 41
(cpu-exec.c:454) [inlined]
5 qemu-system-ppc 0x0000000109c16085 cpu_exec + 2117
(cpu-exec.c:810)
6 qemu-system-ppc 0x0000000109c09ac3 tcg_cpus_exec + 35
(tcg-cpus.c:57)
7 qemu-system-ppc 0x0000000109c75edd rr_cpu_thread_fn +
445 (tcg-cpus-rr.c:217)
8 qemu-system-ppc 0x0000000109e41fae qemu_thread_start +
126 (qemu-thread-posix.c:521)
9 libsystem_pthread.dylib 0x00007fff2038e950 _pthread_start + 224
10 libsystem_pthread.dylib 0x00007fff2038a47b thread_start + 15
Here the crash is in tcg/optimize.c line 212:
mask = si->mask;
"si" is NULL. The NULL value arises from tcg/optimize.c line 198:
si = ts_info(src_ts);
I did not attempt to determine the root cause of this issue, however.
It clearly is related to the "tcg/optimize" changes in this commit.
The previous commit c0dd6654f207810b16a75b673258f5ce2ceffbf0 doesn't
crash.
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