Endless(?) loop following symlinks

[chrysn]

Running the latest lfs does not terminate within several seconds, and produces no output unless invoked with --help.

Under strace I get increasingly long versions of

openat(AT_FDCWD, "/sys/block/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/ng0n1/device/ng0n1/device/nvme0n1/device/ng0n1/device/nvme0n1/device/nvme0n1/device/subsystem/dev", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/sys/block/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/ng0n1/device/ng0n1/device/nvme0n1/device/ng0n1/device/nvme0n1/device/nvme0n1/device/state/dev", O_RDONLY|O_CLOEXEC) = -1 ENOTDIR (Not a directory)
openat(AT_FDCWD, "/sys/block/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/ng0n1/device/ng0n1/device/nvme0n1/device/ng0n1/device/nvme0n1/device/nvme0n1/device/kato/dev", O_RDONLY|O_CLOEXEC) = -1 ENOTDIR (Not a directory)
openat(AT_FDCWD, "/sys/block/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/ng0n1/device/ng0n1/device/nvme0n1/device/ng0n1/device/nvme0n1/device/nvme0n1/device/serial/dev", O_RDONLY|O_CLOEXEC) = -1 ENOTDIR (Not a directory)
getdents64(73, 0x557328fd0a20 /* 0 entries */, 32768) = 0
close(73)                               = 0
openat(AT_FDCWD, "/sys/block/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/nvme0n1/device/ng0n1/device/ng0n1/device/nvme0n1/device/ng0n1/device/nvme0n1/device/nvme0n1/nvme0n1p1/dev", O_RDONLY|O_CLOEXEC) = 73
statx(73, "", AT_STATX_SYNC_AS_STAT|AT_EMPTY_PATH, STATX_ALL, {stx_mask=STATX_BASIC_STATS|STATX_MNT_ID, stx_attributes=0, stx_mode=S_IFREG|0444, stx_size=4096, ...}) = 0

which indicate that the tool is trying to traverse the whole tree without regard for the /sys/block/nvme0n1/device symlink pointing to ../../nvme0.

Kernel this was tested on is 5.13.

[Canop]

Are you able to check with master ? If so I would appreciate a test of the last commited version.

If not, can you drop by my chat ?

[chrysn]

Resolved with latest master, thanks!

[Canop]

And does the LVM device properly appear ?

[chrysn]

Still testing that (not on my main machine, but there may be other things at play here too).