Excerpts from QiuLaibin's message of January 24, 2022 11:08 pm: > Hi Alex > > 1、Please help to import this structure: > > blk_mq_tags <= request_queue->blk_mq_hw_ctx->blk_mq_tags I don't understand what you mean. > If there is no kernel dump, help to see the value of > > cat /sys/block/sda/mq/0/nr_tags > __ <= Change it to the problem device The affected device returns 1. My understanding is that mq does not work with legacy non-UAS devices. > And how many block devices in total by lsblk. My device topology roughly looks like: NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS sda 8:0 0 [snip] 0 disk ├─sda1 8:1 0 [snip] 0 part ├─sda2 8:2 0 [snip] 0 part └─sda3 8:3 0 [snip] 0 part sdb 8:16 0 [snip] 0 disk ├─sdb1 8:17 0 [snip] 0 part ├─sdb2 8:18 0 [snip] 0 part ├─sdb3 8:19 0 [snip] 0 part └─sdb4 8:20 0 [snip] 0 part sdc 8:32 1 [snip] 0 disk ├─sdc1 8:33 1 [snip] 0 part └─sdc2 8:34 1 [snip] 0 part nvme0n1 259:0 0 [snip] 0 disk ├─nvme0n1p1 259:1 0 [snip] 0 part └─nvme0n1p2 259:2 0 [snip] 0 part └─root 254:0 0 [snip] 0 crypt / > 2、Please describe in detail how to reproduce the issue, 1. Plug in the device. 2. Execute Show Blocked Tasks. udev is stuck. > And what type of USB device? It is a cheap unbranded USB flash drive. > 3、Please help to try the attachment patch and see if it can be reproduced. >From a quick test, it appears to resolve the issue. > Thanks. Cheers, Alex.
