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c900ef86c5
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 <dgilbert@redhat.com>
Message-id: 1445951385-11924-1-git-send-email-dgilbert@redhat.com
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
(from_=from_@entry=0x558698cb3cf0, to_=to_@entry=0x7f421c37eac8,
action=action@entry=COROUTINE_YIELD) 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 (f=f@entry=0x558698c50570)
at /home/dgilbert/git/qemu/migration/qemu-file.c:604
#8 0x0000558696347e5c in qemu_loadvm_state (f=f@entry=0x558698c50570)
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 ()
----
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
59 lines
1.8 KiB
Python
59 lines
1.8 KiB
Python
#!/usr/bin/python
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# GDB debugging support: aio/iohandler debug
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#
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# Copyright (c) 2015 Red Hat, Inc.
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#
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# Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
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#
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# This work is licensed under the terms of the GNU GPL, version 2 or
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# later. See the COPYING file in the top-level directory.
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#
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import gdb
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from qemugdb import coroutine
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def isnull(ptr):
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return ptr == gdb.Value(0).cast(ptr.type)
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def dump_aiocontext(context, verbose):
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'''Display a dump and backtrace for an aiocontext'''
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cur = context['aio_handlers']['lh_first']
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# Get pointers to functions we're going to process specially
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sym_fd_coroutine_enter = gdb.parse_and_eval('fd_coroutine_enter')
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while not isnull(cur):
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entry = cur.dereference()
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gdb.write('----\n%s\n' % entry)
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if verbose and cur['io_read'] == sym_fd_coroutine_enter:
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coptr = (cur['opaque'].cast(gdb.lookup_type('FDYieldUntilData').pointer()))['co']
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coptr = coptr.cast(gdb.lookup_type('CoroutineUContext').pointer())
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coroutine.bt_jmpbuf(coptr['env']['__jmpbuf'])
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cur = cur['node']['le_next'];
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gdb.write('----\n')
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class HandlersCommand(gdb.Command):
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'''Display aio handlers'''
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def __init__(self):
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gdb.Command.__init__(self, 'qemu handlers', gdb.COMMAND_DATA,
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gdb.COMPLETE_NONE)
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def invoke(self, arg, from_tty):
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verbose = False
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argv = gdb.string_to_argv(arg)
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if len(argv) > 0 and argv[0] == '--verbose':
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verbose = True
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argv.pop(0)
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if len(argv) > 1:
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gdb.write('usage: qemu handlers [--verbose] [handler]\n')
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return
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if len(argv) == 1:
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handlers_name = argv[0]
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else:
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handlers_name = 'qemu_aio_context'
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dump_aiocontext(gdb.parse_and_eval(handlers_name), verbose)
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