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id = 1944
title = "Deadlock on snapshot removal (bdrv_graph_wrlock)"
state = "closed"
created_at = "2023-10-16T07:43:36.506Z"
closed_at = "2024-11-02T19:00:40.147Z"
labels = ["Storage"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/1944"
host-os = "CentOS 9 Stream"
host-arch = "x86_64"
qemu-version = "qemu-kvm-8.1.0-2.1.el9.x86_64 (Is the 8.1.0-2 version with https://patchwork.kernel.org/project/qemu-devel/patch/20231003125236.216473-2-jean-louis@dupond.be/)"
guest-os = "Debian 11"
guest-arch = "x86_64"
description = """VM was hanging during snapshot removal.
There was an attempt to shutdown the VM, but that did hang.
gdb shows me:
```
(gdb) bt full
#0 0x00007f20493427fe in __ppoll (fds=0x557e630718b0, nfds=2, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:43
sc_ret = -514
sc_cancel_oldtype = 0
sc_ret = <optimized out>
tval = {tv_sec = 139776632323420, tv_nsec = 139776632323432}
#1 0x0000557e619cab52 in fdmon_poll_wait.llvm ()
No symbol table info available.
#2 0x0000557e619ca0b6 in aio_poll ()
No symbol table info available.
#3 0x0000557e61801651 in bdrv_graph_wrlock ()
No symbol table info available.
#4 0x0000557e617c873b in bdrv_replace_child_noperm.llvm ()
No symbol table info available.
#5 0x0000557e617c8601 in bdrv_root_unref_child ()
No symbol table info available.
#6 0x0000557e617f6333 in blk_unref ()
No symbol table info available.
#7 0x0000557e6181b0d1 in mirror_exit_common ()
No symbol table info available.
#8 0x0000557e617dbdb4 in job_do_finalize_locked.llvm ()
No symbol table info available.
#9 0x0000557e617dd72b in job_exit ()
No symbol table info available.
#10 0x0000557e619e5101 in aio_bh_poll ()
No symbol table info available.
#11 0x0000557e619c95a4 in aio_dispatch ()
No symbol table info available.
#12 0x0000557e619e655f in aio_ctx_dispatch ()
No symbol table info available.
#13 0x00007f2049546e2f in g_main_dispatch (context=0x557e62ecebd0) at ../glib/gmain.c:3337
dispatch = 0x557e619e6550 <aio_ctx_dispatch>
prev_source = 0x0
begin_time_nsec = 232172181173336
was_in_call = <optimized out>
user_data = 0x0
callback = 0x0
cb_funcs = 0x0
cb_data = 0x0
need_destroy = <optimized out>
source = 0x557e62ec73e0
current = 0x557e63e4b600
i = 0
__func__ = {<optimized out> <repeats 16 times>}
#14 g_main_context_dispatch (context=0x557e62ecebd0) at ../glib/gmain.c:4055
No locals.
#15 0x0000557e619e74be in main_loop_wait ()
No symbol table info available.
#16 0x0000557e615201e7 in qemu_main_loop ()
No symbol table info available.
#17 0x0000557e61374c6a in qemu_default_main ()
No symbol table info available.
#18 0x00007f204923feb0 in __libc_start_call_main (main=main@entry=0x557e61374c80 <main>, argc=argc@entry=153, argv=argv@entry=0x7ffe07495238) at ../sysdeps/nptl/libc_start_call_main.h:58
self = <optimized out>
result = <optimized out>
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -6145724763479124305, 140729020666424, 94001285254272, 94001294953808, 139776661151744, 6145708635144279727, 6121919821307926191}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x7f204954cb41 <g_malloc0+33>, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 1230293825}}}
not_first_call = <optimized out>
#19 0x00007f204923ff60 in __libc_start_main_impl (main=0x557e61374c80 <main>, argc=153, argv=0x7ffe07495238, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe07495228) at ../csu/libc-start.c:389
No locals.
#20 0x0000557e613743d5 in _start ()
No symbol table info available.
```"""
reproduce = """Still trying to reproduce in lab."""
additional = "n/a"
|