On 03/28/2018 06:02 PM, Jens Axboe wrote: > On 3/28/18 5:03 PM, Zephaniah E. Loss-Cutler-Hull wrote: >> I am not subscribed to any of the lists on the To list here, please CC >> me on any replies. >> >> I am encountering a fairly consistent crash anywhere from 15 minutes to >> 12 hours after boot with scsi_mod.use_blk_mq=1 dm_mod.use_blk_mq=1> >> The crash looks like: >> >> >> Looking through the code, I'd guess that this is dying inside >> blkg_rwstat_add, which calls percpu_counter_add_batch, which is what RIP >> is pointing at. > > Leaving the whole thing here for Paolo - it's crashing off insertion of > a request coming out of SG_IO. Don't think we've seen this BFQ failure > case before. > > You can mitigate this by switching the scsi-mq devices to mq-deadline > instead. > I'm thinking that I should also be able to mitigate it by disabling CONFIG_DEBUG_BLK_CGROUP. That should remove that entire chunk of code. Of course, that won't help if this is actually a symptom of a bigger problem. Regards, Zephaniah E. Loss-Cutler-Hull.
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