[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH v2] gdb command: qemu handlers
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH v2] gdb command: qemu handlers |
Date: |
Tue, 27 Oct 2015 16:53:04 +0000 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Tue, Oct 27, 2015 at 01:09:45PM +0000, Dr. David Alan Gilbert (git) wrote:
> From: "Dr. David Alan Gilbert" <address@hidden>
>
> A new gdb commands are added:
>
> qemu handlers
>
> That dumps an AioContext list (by default qemu_aio_context)
> possibly including a backtrace for cases it knows about
> (with the verbose option). Intended to help find why something
> is hanging waiting for IO.
>
> Use 'qemu handlers --verbose iohandler_ctx' to find out why
> your incoming migration is stuck.
>
> Signed-off-by: Dr. David Alan Gilbert <address@hidden>
>
> V2:
> Merge into one command with optional handlers arg, and only do
> backtrace in verbose mode
>
> (gdb) qemu handlers
> ----
> {pfd = {fd = 6, events = 25, revents = 0}, io_read = 0x55869656ffd0
> <event_notifier_dummy_cb>, io_write = 0x0, deleted = 0, opaque =
> 0x558698c4ce08, node = {le_next = 0x0, le_prev = 0x558698c4cdc0}}
>
> (gdb) qemu handlers iohandler_ctx
> ----
> {pfd = {fd = 9, events = 25, revents = 0}, io_read = 0x558696581380
> <fd_coroutine_enter>, io_write = 0x0, deleted = 0, opaque =
> 0x558698dc99d0, node = {le_next = 0x558698c4cca0, le_prev =
> 0x558698c4c1d0}}
> ----
> {pfd = {fd = 4, events = 25, revents = 0}, io_read = 0x55869657b330
> <sigfd_handler>, io_write = 0x0, deleted = 0, opaque = 0x4, node =
> {le_next = 0x558698c4c260, le_prev = 0x558699f72508}}
> ----
> {pfd = {fd = 5, events = 25, revents = 0}, io_read = 0x55869656ffd0
> <event_notifier_dummy_cb>, io_write = 0x0, deleted = 0, opaque =
> 0x558698c4c218, node = {le_next = 0x0, le_prev = 0x558698c4ccc8}}
> ----
> (gdb) qemu handlers --verbose iohandler_ctx
> ----
> {pfd = {fd = 9, events = 25, revents = 0}, io_read = 0x558696581380
> <fd_coroutine_enter>, io_write = 0x0, deleted = 0, opaque =
> 0x558698dc99d0, node = {le_next = 0x558698c4cca0, le_prev =
> 0x558698c4c1d0}}
> #0 0x0000558696581820 in qemu_coroutine_switch
> (address@hidden, address@hidden,
> address@hidden) at
> /home/dgilbert/git/qemu/coroutine-ucontext.c:177
> #1 0x0000558696580c00 in qemu_coroutine_yield () at
> /home/dgilbert/git/qemu/qemu-coroutine.c:145
> #2 0x00005586965814f5 in yield_until_fd_readable (fd=9) at
> /home/dgilbert/git/qemu/qemu-coroutine-io.c:90
> #3 0x0000558696523937 in socket_get_buffer (opaque=0x55869a3dc620,
> buf=0x558698c505a0 "", pos=<optimized out>, size=32768) at
> /home/dgilbert/git/qemu/migration/qemu-file-unix.c:101
> #4 0x0000558696521fac in qemu_fill_buffer (f=0x558698c50570) at
> /home/dgilbert/git/qemu/migration/qemu-file.c:227
> #5 0x0000558696522989 in qemu_peek_byte (f=0x558698c50570, offset=0)
> at /home/dgilbert/git/qemu/migration/qemu-file.c:507
> #6 0x0000558696522bf4 in qemu_get_be32 (f=0x558698c50570) at
> /home/dgilbert/git/qemu/migration/qemu-file.c:520
> #7 0x0000558696522bf4 in qemu_get_be32 (address@hidden)
> at /home/dgilbert/git/qemu/migration/qemu-file.c:604
> #8 0x0000558696347e5c in qemu_loadvm_state (address@hidden)
> at /home/dgilbert/git/qemu/migration/savevm.c:1821
> #9 0x000055869651de8c in process_incoming_migration_co
> (opaque=0x558698c50570)
> at /home/dgilbert/git/qemu/migration/migration.c:336
> #10 0x000055869658188a in coroutine_trampoline (i0=<optimized out>,
> i1=<optimized out>)
> at /home/dgilbert/git/qemu/coroutine-ucontext.c:80
> #11 0x00007f420f05df10 in __start_context () at /lib64/libc.so.6
> #12 0x00007ffc40815f50 in ()
> #13 0x0000000000000000 in ()
>
> ----
> ---
> scripts/qemu-gdb.py | 3 ++-
> scripts/qemugdb/aio.py | 58
> ++++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 60 insertions(+), 1 deletion(-)
> create mode 100644 scripts/qemugdb/aio.py
Thanks, applied to my block tree:
https://github.com/stefanha/qemu/commits/block
Stefan