On 5/12/20 8:14 PM, Xu, Yanfei wrote: > Hi, > > After operating the /dev/loop which losetup with an image placed in**tmpfs, > > I got the following ERROR messages: > > ----------------[cut here]--------------------- > > [ 183.110770] blk_update_request: I/O error, dev loop6, sector 524160 op 0x9:(WRITE_ZEROES) flags 0x1000800 phys_seg 0 prio class 0 > [ 183.123949] blk_update_request: I/O error, dev loop6, sector 522 op 0x9:(WRITE_ZEROES) flags 0x1000800 phys_seg 0 prio class 0 > [ 183.137123] blk_update_request: I/O error, dev loop6, sector 16906 op 0x9:(WRITE_ZEROES) flags 0x1000800 phys_seg 0 prio class 0 > [ 183.150314] blk_update_request: I/O error, dev loop6, sector 32774 op 0x9:(WRITE_ZEROES) flags 0x1000800 phys_seg 0 prio class 0 > [ 183.163551] blk_update_request: I/O error, dev loop6, sector 49674 op 0x9:(WRITE_ZEROES) flags 0x1000800 phys_seg 0 prio class 0 > [ 183.176824] blk_update_request: I/O error, dev loop6, sector 65542 op 0x9:(WRITE_ZEROES) flags 0x1000800 phys_seg 0 prio class 0 > [ 183.190029] blk_update_request: I/O error, dev loop6, sector 82442 op 0x9:(WRITE_ZEROES) flags 0x1000800 phys_seg 0 prio class 0 > [ 183.203281] blk_update_request: I/O error, dev loop6, sector 98310 op 0x9:(WRITE_ZEROES) flags 0x1000800 phys_seg 0 prio class 0 > [ 183.216531] blk_update_request: I/O error, dev loop6, sector 115210 op 0x9:(WRITE_ZEROES) flags 0x1000800 phys_seg 0 prio class 0 > [ 183.229914] blk_update_request: I/O error, dev loop6, sector 131078 op 0x9:(WRITE_ZEROES) flags 0x1000800 phys_seg 0 prio class 0 > > > I have found the commit which introduce this issue by git bisect : > > commit :efcfec57[loop: fix no-unmap write-zeroes request behavior] Please CC the author of that commit too. Leaving the rest quoted below. > Kernrel version: Linux version 5.6.0 > > Frequency: everytime > > steps to reproduce: > > 1.git clone mainline kernel > > 2.compile kernel with ARCH=x86_64, and then boot the system with it > > (seems other arch also can reproduce it ) > > 3.make an image by "dd of=/tmp/image if=/dev/zero bs=1M count=256" > > *4.**place the image in tmpfs directory* > > 5.losetup /dev/loop6 /PATH/TO/image > > 6.mkfs.ext2 /dev/loop6 > > > Any comments will be appreciated. > > > Thanks, > > Yanfei > > > > > -- Jens Axboe
