Bug#926896: sysvinit-utils: pidof is unreliable

[Witold Baryluk]

Package: sysvinit-utils
Version: 2.93-8
Severity: important

root at debian:~# echo; whoami; echo; ps aux | grep 'dd if'; echo; hd /proc/41344/cmdline ; echo; ls -l /proc/41344/exe; echo; pidof dd || echo "Not found"; echo; ls -l /proc/41344/exe

root

root      41344  2.0  0.0 217704  1960 pts/3    D+   20:40   0:09 dd if=/dev/sdc of=/dev/null bs=64k
root      42045  0.0  0.0 218480   828 pts/9    S+   20:48   0:00 grep dd if

00000000  64 64 00 69 66 3d 2f 64  65 76 2f 73 64 63 00 6f  |dd.if=/dev/sdc.o|
00000010  66 3d 2f 64 65 76 2f 6e  75 6c 6c 00 62 73 3d 36  |f=/dev/null.bs=6|
00000020  34 6b 00                                          |4k.|
00000023

lrwxrwxrwx 1 root root 0 Apr 11 20:44 /proc/41344/exe -> /usr/bin/dd

Not found

lrwxrwxrwx 1 root root 0 Apr 11 20:44 /proc/41344/exe -> /usr/bin/dd
root at debian:~# 


For some reason pidof can't find 'dd'. pidof dd prints nothing and
returns false (exit code 1).

Both dd and pidof are running as root.

killall -USR1 dd , delivers a signal to correct process, so killall (from
psmisc package) does find it.


Thanks.


-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-2-amd64 (SMP w/32 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages sysvinit-utils depends on:
ii  init-system-helpers  1.56+nmu1
ii  libc6                2.28-8
ii  util-linux           2.33.1-0.1

sysvinit-utils recommends no packages.

sysvinit-utils suggests no packages.

-- no debconf information