On Sat, Apr 28, 2018 at 10:27 AM, Pavel Dovgalyuk <dovga...@ispras.ru> wrote: > > >> -----Original Message----- >> From: Ciro Santilli [mailto:ciro.santi...@gmail.com] >> Sent: Saturday, April 28, 2018 11:13 AM >> To: Pavel Dovgalyuk >> Subject: Re: [RFC PATCH 00/17] reverse debugging >> >> Forgetting about debugging, I belive there is a deadlock in the replay >> at 63d426dfa4fbfac3d50cda3f553cd975de2b85ea , but it is rare. >> >> I have only reproduced it on ARM so far, and I haven't checked pre-patch. >> >> The setup is https://github.com/cirosantilli/qemu- >> test/tree/6a3497f0d84e7c86ef80f7322e24e8a149b93214 >> with images-ab21ef58deed8536bc159c2afd680a4fabd68510.zip >> >> Then try to run it several times with: >> >> i=0; while true; do date; echo $i; ../qemu-test/arm/rr; i=$(($i+1)); done >> >> I think the deadlock can happen in a few different places, but the >> most common is when the kernel is doing disk related stuff, the last >> messages before getting stuck are: > > It usually happens when there is some bugs in the implementation of the > virtual devices. > Our customers mostly emulates x86-based systems, therefore most of > the ARM hardware is untested. >
Hi Pete, do you know anything about this? Traces at: http://lists.nongnu.org/archive/html/qemu-devel/2018-04/msg05218.html command at: https://github.com/cirosantilli/qemu-test/blob/6a3497f0d84e7c86ef80f7322e24e8a149b93214/arm/rr @Pavel: I recommend always replying to both me and to qemu-devel to preserve a better history of our talk on the tracker. >> [ 11.530325] ALSA device list: >> [ 11.531451] No soundcards found. >> >> and what would follow on a normal replay would be: >> >> [ 11.551904] EXT4-fs (vda): couldn't mount as ext3 due to feature >> incompatibilities >> [ 11.619238] EXT4-fs (vda): mounted filesystem without journal. Opts: >> (null) >> >> I then attach GDB with: >> >> gdb -q ./arm-softmmu/qemu-system-arm `pgrep qemu` > > > > > Pavel Dovgalyuk >
