Re: [PATCH] block: Revert v5.0 blk_mq_request_issue_directly() changes

Bart Van Assche <bvanassche@xxxxxxx> · Tue, 9 Apr 2019 06:51:52 -0700

On 4/8/19 10:13 PM, Stewart Smith wrote:
At least when this patch is cherry-picked back on top of 5.0.7, it
doesn't seem to fully fix the problem for us (which is ppc64le). We hit
this at some point while eudev is finding disks and we have a process
mounting them to see what's there:

cpu 0x4a: Vector: 400 (Instruction Access) at [c000203ff398b100]
     pc: c0000000021fe700
     lr: c0000000002001d8: blk_mq_complete_request+0x34/0x138
     sp: c000203ff398b390
    msr: 9000000010009033
   current = 0xc000203ff3901b00
   paca    = 0xc000203fff7f3680	 irqmask: 0x03	 irq_happened: 0x01
     pid   = 658, comm = kworker/u257:2
Linux version 5.0.7-openpower1 (hostboot@xxxxxxxxxxxxxxxxxxxxxxxxxx) (gcc version 6.5.0 (Buildroot 2019.02.1-00016-ge01dcd0)) #2 SMP Mon Apr 8 09:14:53 CDT 2019

Can you bisect this crash?

Thanks,

Bart.