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qemu coroutine command results in following error output:
Python Exception <class 'gdb.error'> 'arch_prctl' has unknown return
type; cast the call to its declared return type: Error occurred in
Python command: 'arch_prctl' has unknown return type; cast the call to
its declared return type
Fix it by giving it what it wants: arch_prctl return type.
Information on the topic:
https://sourceware.org/gdb/onlinedocs/gdb/Calling.html
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20190206151425.105871-1-vsementsov@virtuozzo.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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This is required otherwise python complains because of the
accentuated letter in Alex's last name:
Traceback (most recent call last):
File "scripts/qemu-gdb.py", line 29, in <module>
from qemugdb import aio, mtree, coroutine, tcg, timers
File "scripts/qemugdb/timers.py", line 1
SyntaxError: Non-ASCII character '\xc3' in file scripts/qemugdb/timers.py
on line 1, but no encoding declared;
see http://www.python.org/peps/pep-0263.html for details
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <151629549711.18276.15497684562308683805.stgit@bahia.lan>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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This introduces the qemu-gdb command "qemu timers" which will dump the
state of the main timers in the system.
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Add a simple helper to dump lock state.
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Since QEMU has been able to build with native Int128 support this was
broken as it attempts to fish values out of the non-existent
structure. Also the alias print was trying to make a %x out of
gdb.ValueType directly which didn't seem to work.
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
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The following exception is threw:
Python Exception <class 'NameError'> name 'long' is not defined:
Error occurred in Python command: name 'long' is not defined
Python 2.4+, int()/long() have been unified, so replace long
with int.
Signed-off-by: Yang Wei <w90p710@gmail.com>
Message-id: 1449316340-4030-1-git-send-email-w90p710@gmail.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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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>
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These can be useful to manually get a stack trace of a coroutine inside
a core dump.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1444636974-19950-4-git-send-email-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Provide useful Python functions to reach and decipher a jmpbuf.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1444636974-19950-3-git-send-email-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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get_fs_base() cannot be run on a core dump, because it uses the arch_prctl
system call. The fs base is the value that is returned by pthread_self(),
and it would be nice to just glean it from the "info threads" output:
* 1 Thread 0x7f16a3fff700 (LWP 33642) pthread_cond_wait@@GLIBC_2.3.2 ()
^^^^^^^^^^^^^^
but unfortunately the gdb API does not provide that. Instead, we can
look for the "arg" argument of the start_thread function if glibc debug
information are available. If not, fall back to the old mechanism.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1444636974-19950-2-git-send-email-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Split the implementation of CoroutineCommand into its own file.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1439574392-4403-3-git-send-email-peter.maydell@linaro.org
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As we add more commands to our Python gdb debugging support, it's
going to get unwieldy to have everything in a single file. Split
the implementation of the 'mtree' command from qemu-gdb.py into
its own module.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1439574392-4403-2-git-send-email-peter.maydell@linaro.org
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