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Bug
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Resolution: Unresolved
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Undefined
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None
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rhel-9.5
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None
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No
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Moderate
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rhel-net-perf
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ssg_core_services
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5
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False
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False
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None
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None
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None
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None
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Unspecified
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Unspecified
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Unspecified
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x86_64
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None
What were you trying to do that didn't work?
Using dig to resolve queries using the +search option.
What is the impact of this issue to you?
A third-party installer relies on dig and nslookup to get proper addresses from hostname for installation.
Please provide the package NVR for which the bug is seen:
bind-utils-9.16.23-24.el9_5.x86_64 (actually all bind-utils versions from RHEL 9 have this issue)
How reproducible is this bug?:
Always
Steps to reproduce
- Edit /etc/resolv.conf have 4. 6 or more 'nameserver' options and then right after the last one add the 'search' option with two domains to observe the behavior
eg: - vi /etc/resolv.conf
nameserver 127.0.0.1
nameserver 127.0.0.1
nameserver 127.0.0.1
nameserver 127.0.0.1
search test.domain.local domain.local - Then run a strace to the dig command and filter sendmsg()
- strace -Tttvf -s 4096 -e trace=sendmsg -y dig rhel8 +search 2>&1 | grep sendmsg.*rhel8
- Observe behavior, repeat adding multiple 'nameserver' options
Expected results
[root@r95 ~]# strace -Tttvf -s 4096 -e trace=sendmsg -y dig rhel8 +search 2>&1 | grep sendmsg.*rhel8
[pid 7812] 20:05:44.663558 sendmsg(20<socket:[44493]>, {msg_name={sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.0.1")}, msg_namelen=16, msg_iov=[{iov_base="\372\377\1 \0\1\0\0\0\0\0\1\5rhel8\4test\6domain\5local\0\0\1\0\1\0\0)\20\0\0\0\0\0\0\f\0\n\0\10\35,H\233\16F\327\325", iov_len=64}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 64 <0.000024>
[pid 7812] 20:05:44.664891 sendmsg(20<socket:[44495]>, {msg_name={sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.0.1")}, msg_namelen=16, msg_iov=[{iov_base="Sn\1 \0\1\0\0\0\0\0\1\5rhel8\6domain\5local\0\0\1\0\1\0\0)\20\0\0\0\0\0\0\f\0\n\0\10\35,H\233\16F\327\325", iov_len=59}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 59 <0.000035>
[pid 7812] 20:05:44.666076 sendmsg(20<socket:[44496]>, {msg_name={sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.0.1")}, msg_namelen=16, msg_iov=[{iov_base="\240\273\1 \0\1\0\0\0\0\0\1\5rhel8\0\0\1\0\1\0\0)\20\0\0\0\0\0\0\f\0\n\0\10\35,H\233\16F\327\325", iov_len=46}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 46 <0.000032>
Actual results
[root@r95 ~]# strace -Tttvf -s 4096 -e trace=sendmsg -y dig rhel8 +search 2>&1 | grep sendmsg.*rhel8
[pid 7822] 20:07:20.667677 sendmsg(20<socket:[44513]>, {msg_name={sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.0.1")}, msg_namelen=16, msg_iov=[{iov_base="\212\334\1 \0\1\0\0\0\0\0\1\5rhel8\0\0\1\0\1\0\0)\20\0\0\0\0\0\0\f\0\n\0\10\342\361\300\245\375\226\314\255", iov_len=46}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 46 <0.000050>
Additional information
In gdb we can see search list being set as null,
searchlist = {head = 0x0, tail = 0x0}
- is incorporated by
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RHEL-6454 Update to latest minor version 9.16.50
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- Planning
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- links to