Description of problem: While scratch building a new version of parted we discovered that the test suite gets stuck running mkswap on a file and never exits. https://koji.fedoraproject.org/koji/taskinfo?taskID=70093944 The setup for the mock used by the builder is here: https://kojipkgs.fedoraproject.org//work/tasks/4003/70094003/mock_output.log It is using util-linux-core-2.37-2.fc35.x86_64 The test that is getting stuck is basically doing this: dd if=/dev/null of=loop-file bs=1 seek=1M mkswap loop-file parted -s loop-file mklabel msdos An strace of the stuck process on the builder shows it stuck in a loop doing this repeatedly: 26902 ioctl(3, FS_IOC_FIEMAP, {fm_start=4820512, fm_length=18446744073709551615, fm_flags=FIEMAP_FLAG_SYNC, fm_extent_count=145} => {fm_flags=FIEMAP_FLAG_SYNC, fm_mapped_extents=0, ...}) = 0 The builder is Fedora 34 with kernel 5.12.8-300.fc34 and this is running in a rawhide mock environment. I have been unable to reproduce this locally, sorry about that. It does seem to hit all the koji builder arches except for i686.
If I switch it to using 'dd if=/dev/zero of=loop-file bs=1M count=1' instead of /dev/null it doesn't get stuck so it appears to be related to having a file that's just one big hole. A later use of mkswap on a file created with dd.../dev/null also doesn't fail because (I think) the file is written to before the mkswap is run on it (parted test t9050).
Result of the bisection: 95025c29e2ae7b1b203fb18d57509f675e924cd is the first bad commit commit 195025c29e2ae7b1b203fb18d57509f675e924cd Author: Karel Zak <kzak> Date: Wed Sep 9 11:00:40 2020 +0200 mkswap: check for holes and unwanted extentd in file Let's make mkswap(8) more user-friend and report possible swapon issues already when user initialize a swap file. The extents check produces warnings, no exit with error. # dd if=/dev/zero of=img count=100 bs=1MiB # chmod 0600 img # fallocate --dig-hole --offset 64520192 --length 1MiB img # fallocate --dig-hole --offset 84520960 --length 1MiB img # ./mkswap img mkswap: extents check failed: - hole detected at offset 64520192 (size 1048576 bytes) - hole detected at offset 84520960 (size 1048576 bytes) file img can be rejected by kernel on swap activation. Setting up swapspace version 1, size = 100 MiB (104853504 bytes) no label, UUID=92091112-26b5-47aa-a02a-592e52528319 It checks for holes in the file, and for unknown, inline, shared and deallocated extents. Addresses: https://github.com/karelzak/util-linux/issues/1120 Signed-off-by: Karel Zak <kzak> configure.ac | 1 + disk-utils/mkswap.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 95 insertions(+), 2 deletions(-)
Fixed by upstream commit 8a3a74160b96498d672e3652827aa7e6d7f3a120. The change will be available in v2.37.1.
This bug appears to have been reported against 'rawhide' during the Fedora 35 development cycle. Changing version to 35.
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