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migration/colo: Fix bdrv_graph_rdlock_main_loop: Assertion `!qemu_in_coroutine()' failed.

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bdrv_activate_all() should not be called from the coroutine context, move
it to the QEMU thread colo_process_incoming_thread() with the bql_lock
protected.

The backtrace is as follows:
 #4  0x0000561af7948362 in bdrv_graph_rdlock_main_loop () at ../block/graph-lock.c:260
 #5  0x0000561af7907a68 in graph_lockable_auto_lock_mainloop (x=0x7fd29810be7b) at /patch/to/qemu/include/block/graph-lock.h:259
 #6  0x0000561af79167d1 in bdrv_activate_all (errp=0x7fd29810bed0) at ../block.c:6906
 #7  0x0000561af762b4af in colo_incoming_co () at ../migration/colo.c:935
 #8  0x0000561af7607e57 in process_incoming_migration_co (opaque=0x0) at ../migration/migration.c:793
 #9  0x0000561af7adbeeb in coroutine_trampoline (i0=-106876144, i1=22042) at ../util/coroutine-ucontext.c:175
 #10 0x00007fd2a5cf21c0 in  () at /lib64/libc.so.6

Cc: qemu-stable@nongnu.org
Cc: Fabiano Rosas <farosas@suse.de>
Closes: https://gitlab.com/qemu-project/qemu/-/issues/2277
Fixes: 2b3912f135 ("block: Mark bdrv_first_blk() and bdrv_is_root_node() GRAPH_RDLOCK")
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
Reviewed-by: Zhang Chen <chen.zhang@intel.com>
Tested-by: Zhang Chen <chen.zhang@intel.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240417025634.1014582-1-lizhijian@fujitsu.com
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Li Zhijian 2024-04-17 10:56:34 +08:00 committed by Peter Xu
parent 5ef7e26bdb
commit 2cc637f1ea
1 changed files with 10 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
migration/colo.c
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@ -835,6 +835,16 @@ static void *colo_process_incoming_thread(void *opaque)
return NULL;
}
/* Make sure all file formats throw away their mutable metadata */
bql_lock();
bdrv_activate_all(&local_err);
if (local_err) {
bql_unlock();
error_report_err(local_err);
return NULL;
}
bql_unlock();
failover_init_state();
mis->to_src_file = qemu_file_get_return_path(mis->from_src_file);
@ -922,7 +932,6 @@ out:
int coroutine_fn colo_incoming_co(void)
{
MigrationIncomingState *mis = migration_incoming_get_current();
Error *local_err = NULL;
QemuThread th;
assert(bql_locked());
@ -931,13 +940,6 @@ int coroutine_fn colo_incoming_co(void)
return 0;
}
/* Make sure all file formats throw away their mutable metadata */
bdrv_activate_all(&local_err);
if (local_err) {
error_report_err(local_err);
return -EINVAL;
}
qemu_thread_create(&th, "COLO incoming", colo_process_incoming_thread,
mis, QEMU_THREAD_JOINABLE);