Il 22/11/2012 14:34, Jan Kiszka ha scritto:
>
> =>0 0xf77c242e __kernel_vsyscall+0xe() in [vdso].so (0x0519df88)
> 1 0xf761f10b __libc_read+0x4a() in libpthread.so.0 (0x0519df88)
> 2 0x7bc78c98 in ntdll (+0x68c97) (0x0519df88)
> 3 0x7bc7b0a3 in ntdll (+0x6b0a2) (0x0519e1b8)
> 4 0x7bc7b195 NtWaitForMultipleObjects+0x54() in ntdll (0x0519e1e8)
> 5 0x7b86de9f WaitForMultipleObjectsEx+0xee() in kernel32 (0x0519e338)
> 6 0x7b86df1a WaitForMultipleObjects+0x39() in kernel32 (0x0519e368)
> 7 0x0040301b aio_poll+0x16a(ctx=0x157610, blocking=<is not available>)
> [/data/qemu/aio-win32.c:178] in qemu-system-arm (0x00000001)
> 8 0x004feec3 qemu_aio_wait+0x22() [/data/qemu/main-loop.c:442] in
> qemu-system-arm (0x0105bdec)
> 9 0x00417166 bdrv_rw_co+0xa5(bs=0x159648, sector_num=<internal error>,
> buf="¹¸ÿ¦
>
> ", nb_sectors=0x4, is_write=true) [/data/qemu/block.c:1997] in
> qemu-system-arm (0x0105bdec)
> 10 0x00495544 in qemu-system-arm (+0x95543) (0x0105bdec)
> 11 0x0049592a pflash_write+0x3b9(pfl=0xd6f16e0, offset=<internal error>,
> value=0x98f7fb1d, width=0x4, be=0) [/data/qemu/hw/pflash_cfi01.c:405] in
> qemu-system-arm (0x0105bdec)
> 12 0x00618a7e io_mem_write+0xed(mr=0xd6f2a48, addr=0x105bdec,
> val=0x98f7fb1d, size=0x4) [/data/qemu/memory.c:911] in qemu-system-arm
> (0x00000004)
> 13 0x0064088c helper_stl_mmu+0x2fb(env=0x15e268, addr=0xca05bdec,
> val=0x98f7fb1d, mmu_idx=0) [/data/qemu/softmmu_template.h:231] in
> qemu-system-arm (0x3700001e)
> 14 0x02136637 (0x0015e268)
>
> It's the VCPU thread stuck in aio_poll, holding the BQL, blocking the
> iothread this way as well. Is there some race that prevents we receive
> the proper IO completion signal? Any states I should check?
Ah, so it wasn't fixed by the TLS change?
Instead of tracing, can you try adding printfs in aio_worker
(block/raw-win32.c), and also in thread_pool_active and
event_notifier_ready (thread-pool.c)?
This patch can help gathering debug output, it will place it into a
console window.
diff --git a/vl.c b/vl.c
index c8e9c78..5398178 100644
--- a/vl.c
+++ b/vl.c
@@ -3531,6 +3531,10 @@ int main(int argc, char **argv, char **envp)
}
loc_set_none();
+ AllocConsole();
+ freopen("CONIN$", "rb", stdin);
+ freopen("CONOUT$", "wb", stdout);
+ freopen("CONOUT$", "wb", stderr);
if (qemu_init_main_loop()) {
fprintf(stderr, "qemu_init_main_loop failed\n");
exit(1);
Paolo
