Messages in this thread | | | From | Johannes Thumshirn <> | Subject | Re: [PATCH] block: tolerate 0 byte discard_granularity in __blkdev_issue_discard() | Date | Tue, 4 Aug 2020 14:37:50 +0000 |
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On 04/08/2020 16:34, Coly Li wrote: > On 2020/8/4 22:31, Johannes Thumshirn wrote: >> On 04/08/2020 16:23, Coly Li wrote: >>> This is the procedure to reproduce the panic, >>> # modprobe scsi_debug delay=0 dev_size_mb=2048 max_queue=1 >>> # losetup -f /dev/nvme0n1 --direct-io=on >>> # blkdiscard /dev/loop0 -o 0 -l 0x200 >> >> losetup -f /dev/sdX isn't it? >> > > In my case, I use a NVMe SSD as the backing device of the loop device. > Because I don't have a scsi lun. > > And loading scsi_debug module seems necessary, otherwise the discard > process just hang and I cannot see the kernel panic (I don't know why yet).
OK, now that's highly interesting. Does it also happen if you back loop with a file? loop_config_discard() has different cases for the different backing devices/files. S
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