https://bugzilla.kernel.org/show_bug.cgi?id=118041 --- Comment #4 from Navin <navinp1912@xxxxxxxxx> --- Not related to ext4 . I can reproduce this with below script and i think dm-devel@xxxxxxxxxx should be contacted. I tested on Linux junk-foo 4.2.0-35-generic from Ubuntu (15.10 ) x64. Linux junk-foo 4.2.0-35-generic #40-Ubuntu SMP Tue Mar 15 22:15:45 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux Here is a script that crashes the kernel for me with out of memory. Looks to be a dm problem because it occurs with dd,mkfs.xfs,mkfs.vat ,without zram ie with losetup. Here is the script.Should be run as root for losetup and dmsetup permissions. #!/bin/bash fallocate -l 50M 50M_file_unused fallocate -l 60M 60M_file_unused losetup /dev/loop4 50M_file_unused losetup /dev/loop5 60M_file_unused MS=$(blockdev --getsize /dev/loop4) WS=$(blockdev --getsize /dev/loop5) echo "0 $MS linear /dev/loop4 0 \n $MS $WS linear /dev/loop5 0" | dmsetup create cryptie4-ff DS=$(blockdev --getsize /dev/mapper/cryptie4-ff) MN=$(printf '%d:%d' `stat -Lc '0x%t 0x%T' /dev/loop4`) WN=$(printf '%d:%d' `stat -Lc '0x%t 0x%T' /dev/loop5`) DN=$(printf '%d:%d' `stat -Lc '0x%t 0x%T' /dev/mapper/cryptie4-ff`) #pv /dev/mapper/cryptie4-ff | hashed_update /dev/stdin NULL /dev/zram0 /tmp/ff.md5 65536 pv /dev/mapper/cryptie4-ff dmsetup create ff --table "0 $MS snapshot-origin $MN" After this doing this dd if=/dev/zero of=/dev/mapper/ff or mkfs.xfs /mkfs.ext4 on /dev/mapper/ff will fail. -- You are receiving this mail because: You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
