Description of problem:
Segmentation fault when list filesystems of guest in read-only mode
Version-Release number of selected component (if applicable):
libvirt-5.0.0-2.el8.x86_64
How reproducible:
1005
Steps to Reproduce:
1.prepare a guest
# virsh list --all
Id Name State
--------------------------------
4 avocado-vt-vm1 running
2. list its filesystems in read-only mode
# virsh -r domfsinfo avocado-vt-vm1
error: Unable to get filesystem information
Segmentation fault (core dumped)
Expected results:
no segmentation fault
Additional info:
(gdb) r -r domfsinfo avocado-vt-vm1
Starting program: /usr/bin/virsh -r domfsinfo avocado-vt-vm1
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7fffe0973700 (LWP 25073)]
error: Unable to get filesystem information
Thread 1 "virsh" received signal SIGSEGV, Segmentation fault.
0x00007ffff3b76491 in free () from /lib64/libc.so.6
(gdb) bt full
#0 0x00007ffff3b76491 in free () from /lib64/libc.so.6
No symbol table info available.
#1 0x00007ffff7430baf in virFree (ptrptr=0x555555822900) at util/viralloc.c:581
save_errno = 0
#2 0x00007ffff765f668 in virDomainFSInfoFree (info=<optimized out>) at libvirt-domain.c:11895
i = <optimized out>
#3 0x0000555555593cd2 in cmdDomFSInfo (ctl=0x7fffffffdfc0, cmd=<optimized out>) at virsh-domain.c:13990
dom = 0x55555582b590
ret = -1
i = 0
j = <optimized out>
info = 0x5555557fe4c0 <last_error>
table = 0x0
#4 0x00005555555bf282 in vshCommandRun (ctl=0x7fffffffdfc0, cmd=0x555555822200) at vsh.c:1310
....
#5 0x0000555555581876 in main (argc=4, argv=<optimized out>) at virsh.c:920
....
(gdb) f 3
#3 0x0000555555593cd2 in cmdDomFSInfo (ctl=0x7fffffffdfc0, cmd=<optimized out>) at virsh-domain.c:13990
13990 virsh-domain.c: No such file or directory.
(gdb) p *info[i]
$1 = {mountpoint = 0x140000001d <error: Cannot access memory at address 0x140000001d>,
name = 0x555555822440 "operation forbidden: read only access prevents virDomainGetFSInfo", fstype = 0x2 <error: Cannot access memory at address 0x2>, ndevAlias = 0,
devAlias = 0x0}
Verify this bug with:
libvirt-5.0.0-5.module+el8+2850+33063f9c.x86_64
Verification steps:
1.prepare a guest
# virsh list --all
Id Name State
--------------------------------
4 avocado-vt-vm1 running
2. list its filesystems in read-only mode
# virsh -r domfsinfo avocado-vt-vm1
error: Unable to get filesystem information
error: operation forbidden: read only access prevents virDomainGetFSInfo
No segmentation fault, mark the bug as verified.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2019:1293
Description of problem: Segmentation fault when list filesystems of guest in read-only mode Version-Release number of selected component (if applicable): libvirt-5.0.0-2.el8.x86_64 How reproducible: 1005 Steps to Reproduce: 1.prepare a guest # virsh list --all Id Name State -------------------------------- 4 avocado-vt-vm1 running 2. list its filesystems in read-only mode # virsh -r domfsinfo avocado-vt-vm1 error: Unable to get filesystem information Segmentation fault (core dumped) Expected results: no segmentation fault Additional info: (gdb) r -r domfsinfo avocado-vt-vm1 Starting program: /usr/bin/virsh -r domfsinfo avocado-vt-vm1 [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". [New Thread 0x7fffe0973700 (LWP 25073)] error: Unable to get filesystem information Thread 1 "virsh" received signal SIGSEGV, Segmentation fault. 0x00007ffff3b76491 in free () from /lib64/libc.so.6 (gdb) bt full #0 0x00007ffff3b76491 in free () from /lib64/libc.so.6 No symbol table info available. #1 0x00007ffff7430baf in virFree (ptrptr=0x555555822900) at util/viralloc.c:581 save_errno = 0 #2 0x00007ffff765f668 in virDomainFSInfoFree (info=<optimized out>) at libvirt-domain.c:11895 i = <optimized out> #3 0x0000555555593cd2 in cmdDomFSInfo (ctl=0x7fffffffdfc0, cmd=<optimized out>) at virsh-domain.c:13990 dom = 0x55555582b590 ret = -1 i = 0 j = <optimized out> info = 0x5555557fe4c0 <last_error> table = 0x0 #4 0x00005555555bf282 in vshCommandRun (ctl=0x7fffffffdfc0, cmd=0x555555822200) at vsh.c:1310 .... #5 0x0000555555581876 in main (argc=4, argv=<optimized out>) at virsh.c:920 .... (gdb) f 3 #3 0x0000555555593cd2 in cmdDomFSInfo (ctl=0x7fffffffdfc0, cmd=<optimized out>) at virsh-domain.c:13990 13990 virsh-domain.c: No such file or directory. (gdb) p *info[i] $1 = {mountpoint = 0x140000001d <error: Cannot access memory at address 0x140000001d>, name = 0x555555822440 "operation forbidden: read only access prevents virDomainGetFSInfo", fstype = 0x2 <error: Cannot access memory at address 0x2>, ndevAlias = 0, devAlias = 0x0}