Hi,
I have seen the following problem several times recently. This is with qemu-4.0.
qemu-system-x86_64: hw/usb/core.c:720: usb_ep_get: Assertion `dev != NULL'
failed
Backtrace gives me the following call path.
main_loop()
main_loop_wait()
glib_pollfds_poll()
aio_ctx_dispatch()
aio_dispatch()
aio_bh_poll()
ehci_work_bh()
ehci_advance_async_state()
ehci_advance_state()
ehci_execute()
usb_ep_get()
The problem always happens during shutdown, maybe once every 100 boots.
It seems to be more likely to happen when the system is under heavy load.
...
umount: devtmpfs busy - remounted read-only
[ 49.018682] EXT4-fs (sda): re-mounted. Opts: (null)
[ 49.028052] sd 6:0:0:0: [sda] Synchronizing SCSI cache
qemu-system-x86_64: hw/usb/core.c:733: usb_ep_get: Assertion `dev != NULL'
failed.
Essentially that means that p->queue->dev is NULL in ehci_execute().
Has anyone else seen this problem ? Any idea what I can do to debug
this further ?
Thanks,
Guenter
