On 3/26/21 1:44 AM, Shinichiro Kawasaki wrote: > I applied this series on v5.12-rc4 and ran blktests block/005 with a HDD behind > SAS-HBA, and I observed kernel INFO and WARNING [1]. It looks like that > tags->iter_rwsem is not initialized. I found blk_mq_init_tags() has two paths > to "return tags". I think when blk_mq_init_tags() returns at the first path to > "return tags", tags->iter_rwsem misses the initialization. To confirm it, I > moved the init_rwsem() before the first "return tags", then saw the kernel > messages disappeared (use-after-free disappeared also). Hi Shinichiro, Thanks for the quick feedback. I agree with your analysis and will fix this in v4 of this patch series. Bart.
