[Qemu-devel] qemu crash in coroutine bdrv_co_do_rw

[Christian Borntraeger <borntraeger@de.ibm.com>]

Stefan,

is this some know issue? Under heavy load with lots of dataplane devices I sometimes get a segfault in the bdrc_co_do_rw routine:

#0  bdrv_co_do_rw (opaque=0x0) at /home/cborntra/REPOS/qemu/block.c:4791
4791	    if (!acb->is_write) {
(gdb) bt
#0  bdrv_co_do_rw (opaque=0x0) at /home/cborntra/REPOS/qemu/block.c:4791
#1  0x00000000801aeb78 in coroutine_trampoline (i0=<optimized out>, i1=-725099072) at /home/cborntra/REPOS/qemu/coroutine-ucontext.c:80
#2  0x000003fffbe1cca2 in __makecontext_ret () from /lib64/libc.so.6
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb) up
#1  0x00000000801aeb78 in coroutine_trampoline (i0=<optimized out>, i1=-725099072) at /home/cborntra/REPOS/qemu/coroutine-ucontext.c:80
80	        co->entry(co->entry_arg);
(gdb) print *co
$1 = {entry = 0x801a3c28 <bdrv_co_do_rw>, entry_arg = 0x0, caller = 0x3ffe2fff788, pool_next = {sle_next = 0x3ffd2287990}, co_queue_wakeup = {tqh_first = 0x0, 
    tqh_last = 0x3ffd4c7dde0}, co_queue_next = {tqe_next = 0x0, tqe_prev = 0x0}}

As you can see enty_arg is 0, causing the problem. Do you have any quick idea before I start debugging?

Christian