Note: This bug is displayed in read-only format because
the product is no longer active in Red Hat Bugzilla.
RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Description of problem:
First, add hugepagesz=1G default_hugepagesz=1G to host kernel line. make sure host support 1G hugepage. Then starting qemu-kvm process with "-object memory-backend-file,.....size=512M". size < 1G hugepage. qemu-kvm-rhev core dump. QE tested libvirt as well. libvirt show error message as below.
error: internal error: process exited while connecting to monitor: Bad ram offset fffffffffffff000
Version-Release number of selected component (if applicable):
3.10.0-195.el7.x86_64
qemu-kvm-rhev-2.1.2-6.el7.x86_64
How reproducible:
100%
Steps to Reproduce:
1.make sure host support 1G hugepage
# cat /sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hugepages
1
2.starting qemu-kvm-rhev process with cli
/usr/libexec/qemu-kvm -m 512 \
-object memory-backend-file,prealloc=yes,mem-path=/mnt/kvm_hugepage1/libvirt/qemu,size=512M,id=ram-node0,host-nodes=0,policy=bind \
-numa node,nodeid=0,cpus=0-1,memdev=ram-node0 \
3.
Actual results:
(gdb) bt
#0 0x00007ffff1a075e9 in raise () from /lib64/libc.so.6
#1 0x00007ffff1a08cf8 in abort () from /lib64/libc.so.6
#2 0x0000555555622eca in qemu_get_ram_block (addr=<optimized out>) at /usr/src/debug/qemu-2.1.2/exec.c:797
#3 0x0000555555625119 in qemu_get_ram_ptr (addr=18446744073709547520) at /usr/src/debug/qemu-2.1.2/exec.c:1512
#4 0x0000555555658ce7 in memory_region_get_ram_ptr (mr=mr@entry=0x555556192290) at /usr/src/debug/qemu-2.1.2/memory.c:1458
#5 0x00005555557627ec in host_memory_backend_memory_complete (uc=<optimized out>, errp=0x7fffffffdf90) at backends/hostmem.c:291
#6 0x0000555555736185 in object_add (type=<optimized out>, id=0x5555561904c0 "ram-node0", qdict=qdict@entry=0x555556190d50, v=0x555556190c50,
errp=errp@entry=0x7fffffffdfe8) at qmp.c:630
#7 0x0000555555724174 in object_create (opts=<optimized out>, opaque=<optimized out>) at vl.c:2899
#8 0x000055555589079b in qemu_opts_foreach (list=<optimized out>, func=func@entry=0x555555723fd0 <object_create>, opaque=opaque@entry=0x0,
abort_on_failure=abort_on_failure@entry=0) at util/qemu-option.c:1072
#9 0x000055555561d08c in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4240
(gdb)
#0 0x00007ffff1a075e9 in raise () from /lib64/libc.so.6
#1 0x00007ffff1a08cf8 in abort () from /lib64/libc.so.6
#2 0x0000555555622eca in qemu_get_ram_block (addr=<optimized out>) at /usr/src/debug/qemu-2.1.2/exec.c:797
#3 0x0000555555625119 in qemu_get_ram_ptr (addr=18446744073709547520) at /usr/src/debug/qemu-2.1.2/exec.c:1512
#4 0x0000555555658ce7 in memory_region_get_ram_ptr (mr=mr@entry=0x555556192290) at /usr/src/debug/qemu-2.1.2/memory.c:1458
#5 0x00005555557627ec in host_memory_backend_memory_complete (uc=<optimized out>, errp=0x7fffffffdf90) at backends/hostmem.c:291
#6 0x0000555555736185 in object_add (type=<optimized out>, id=0x5555561904c0 "ram-node0", qdict=qdict@entry=0x555556190d50, v=0x555556190c50,
errp=errp@entry=0x7fffffffdfe8) at qmp.c:630
#7 0x0000555555724174 in object_create (opts=<optimized out>, opaque=<optimized out>) at vl.c:2899
#8 0x000055555589079b in qemu_opts_foreach (list=<optimized out>, func=func@entry=0x555555723fd0 <object_create>, opaque=opaque@entry=0x0,
abort_on_failure=abort_on_failure@entry=0) at util/qemu-option.c:1072
#9 0x000055555561d08c in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4240
(gdb)
#0 0x00007ffff1a075e9 in raise () from /lib64/libc.so.6
#1 0x00007ffff1a08cf8 in abort () from /lib64/libc.so.6
#2 0x0000555555622eca in qemu_get_ram_block (addr=<optimized out>) at /usr/src/debug/qemu-2.1.2/exec.c:797
#3 0x0000555555625119 in qemu_get_ram_ptr (addr=18446744073709547520) at /usr/src/debug/qemu-2.1.2/exec.c:1512
#4 0x0000555555658ce7 in memory_region_get_ram_ptr (mr=mr@entry=0x555556192290) at /usr/src/debug/qemu-2.1.2/memory.c:1458
#5 0x00005555557627ec in host_memory_backend_memory_complete (uc=<optimized out>, errp=0x7fffffffdf90) at backends/hostmem.c:291
#6 0x0000555555736185 in object_add (type=<optimized out>, id=0x5555561904c0 "ram-node0", qdict=qdict@entry=0x555556190d50, v=0x555556190c50,
errp=errp@entry=0x7fffffffdfe8) at qmp.c:630
#7 0x0000555555724174 in object_create (opts=<optimized out>, opaque=<optimized out>) at vl.c:2899
#8 0x000055555589079b in qemu_opts_foreach (list=<optimized out>, func=func@entry=0x555555723fd0 <object_create>, opaque=opaque@entry=0x0,
abort_on_failure=abort_on_failure@entry=0) at util/qemu-option.c:1072
#9 0x000055555561d08c in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4240
(gdb)
#0 0x00007ffff1a075e9 in raise () from /lib64/libc.so.6
#1 0x00007ffff1a08cf8 in abort () from /lib64/libc.so.6
#2 0x0000555555622eca in qemu_get_ram_block (addr=<optimized out>) at /usr/src/debug/qemu-2.1.2/exec.c:797
#3 0x0000555555625119 in qemu_get_ram_ptr (addr=18446744073709547520) at /usr/src/debug/qemu-2.1.2/exec.c:1512
#4 0x0000555555658ce7 in memory_region_get_ram_ptr (mr=mr@entry=0x555556192290) at /usr/src/debug/qemu-2.1.2/memory.c:1458
#5 0x00005555557627ec in host_memory_backend_memory_complete (uc=<optimized out>, errp=0x7fffffffdf90) at backends/hostmem.c:291
#6 0x0000555555736185 in object_add (type=<optimized out>, id=0x5555561904c0 "ram-node0", qdict=qdict@entry=0x555556190d50, v=0x555556190c50,
errp=errp@entry=0x7fffffffdfe8) at qmp.c:630
#7 0x0000555555724174 in object_create (opts=<optimized out>, opaque=<optimized out>) at vl.c:2899
#8 0x000055555589079b in qemu_opts_foreach (list=<optimized out>, func=func@entry=0x555555723fd0 <object_create>, opaque=opaque@entry=0x0,
abort_on_failure=abort_on_failure@entry=0) at util/qemu-option.c:1072
#9 0x000055555561d08c in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4240
Expected results:
qemu-kvm-rhev show correctly and friendly error message. shouldn't core dump.
Additional info:
libivrt hit the same issue.
Sorry,There are some redundant(repeat gdb) information in comment 0. This is only core trace information as below.
(gdb) bt
#0 0x00007ffff1a075e9 in raise () from /lib64/libc.so.6
#1 0x00007ffff1a08cf8 in abort () from /lib64/libc.so.6
#2 0x0000555555622eca in qemu_get_ram_block (addr=<optimized out>) at /usr/src/debug/qemu-2.1.2/exec.c:797
#3 0x0000555555625119 in qemu_get_ram_ptr (addr=18446744073709547520) at /usr/src/debug/qemu-2.1.2/exec.c:1512
#4 0x0000555555658ce7 in memory_region_get_ram_ptr (mr=mr@entry=0x555556192290) at /usr/src/debug/qemu-2.1.2/memory.c:1458
#5 0x00005555557627ec in host_memory_backend_memory_complete (uc=<optimized out>, errp=0x7fffffffdf90) at backends/hostmem.c:291
#6 0x0000555555736185 in object_add (type=<optimized out>, id=0x5555561904c0 "ram-node0", qdict=qdict@entry=0x555556190d50, v=0x555556190c50,
errp=errp@entry=0x7fffffffdfe8) at qmp.c:630
#7 0x0000555555724174 in object_create (opts=<optimized out>, opaque=<optimized out>) at vl.c:2899
#8 0x000055555589079b in qemu_opts_foreach (list=<optimized out>, func=func@entry=0x555555723fd0 <object_create>, opaque=opaque@entry=0x0,
abort_on_failure=abort_on_failure@entry=0) at util/qemu-option.c:1072
#9 0x000055555561d08c in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4240
For reference, this is the error message that's expected after applying the fix for bug 1147354:
# /usr/libexec/qemu-kvm -m 512 -object memory-backend-file,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,size=512M,id=ram-node0,host-nodes=0,policy=bind -numa node,nodeid=0,cpus=0-1,memdev=ram-node0
qemu-kvm: -object memory-backend-file,prealloc=yes,mem-path=/dev/hugepages/libvirt/qemu,size=512M,id=ram-node0,host-nodes=0,policy=bind: memory size 0x20000000 must be equal to or larger than huge page size 0x40000000
Description of problem: First, add hugepagesz=1G default_hugepagesz=1G to host kernel line. make sure host support 1G hugepage. Then starting qemu-kvm process with "-object memory-backend-file,.....size=512M". size < 1G hugepage. qemu-kvm-rhev core dump. QE tested libvirt as well. libvirt show error message as below. error: internal error: process exited while connecting to monitor: Bad ram offset fffffffffffff000 Version-Release number of selected component (if applicable): 3.10.0-195.el7.x86_64 qemu-kvm-rhev-2.1.2-6.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1.make sure host support 1G hugepage # cat /sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hugepages 1 2.starting qemu-kvm-rhev process with cli /usr/libexec/qemu-kvm -m 512 \ -object memory-backend-file,prealloc=yes,mem-path=/mnt/kvm_hugepage1/libvirt/qemu,size=512M,id=ram-node0,host-nodes=0,policy=bind \ -numa node,nodeid=0,cpus=0-1,memdev=ram-node0 \ 3. Actual results: (gdb) bt #0 0x00007ffff1a075e9 in raise () from /lib64/libc.so.6 #1 0x00007ffff1a08cf8 in abort () from /lib64/libc.so.6 #2 0x0000555555622eca in qemu_get_ram_block (addr=<optimized out>) at /usr/src/debug/qemu-2.1.2/exec.c:797 #3 0x0000555555625119 in qemu_get_ram_ptr (addr=18446744073709547520) at /usr/src/debug/qemu-2.1.2/exec.c:1512 #4 0x0000555555658ce7 in memory_region_get_ram_ptr (mr=mr@entry=0x555556192290) at /usr/src/debug/qemu-2.1.2/memory.c:1458 #5 0x00005555557627ec in host_memory_backend_memory_complete (uc=<optimized out>, errp=0x7fffffffdf90) at backends/hostmem.c:291 #6 0x0000555555736185 in object_add (type=<optimized out>, id=0x5555561904c0 "ram-node0", qdict=qdict@entry=0x555556190d50, v=0x555556190c50, errp=errp@entry=0x7fffffffdfe8) at qmp.c:630 #7 0x0000555555724174 in object_create (opts=<optimized out>, opaque=<optimized out>) at vl.c:2899 #8 0x000055555589079b in qemu_opts_foreach (list=<optimized out>, func=func@entry=0x555555723fd0 <object_create>, opaque=opaque@entry=0x0, abort_on_failure=abort_on_failure@entry=0) at util/qemu-option.c:1072 #9 0x000055555561d08c in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4240 (gdb) #0 0x00007ffff1a075e9 in raise () from /lib64/libc.so.6 #1 0x00007ffff1a08cf8 in abort () from /lib64/libc.so.6 #2 0x0000555555622eca in qemu_get_ram_block (addr=<optimized out>) at /usr/src/debug/qemu-2.1.2/exec.c:797 #3 0x0000555555625119 in qemu_get_ram_ptr (addr=18446744073709547520) at /usr/src/debug/qemu-2.1.2/exec.c:1512 #4 0x0000555555658ce7 in memory_region_get_ram_ptr (mr=mr@entry=0x555556192290) at /usr/src/debug/qemu-2.1.2/memory.c:1458 #5 0x00005555557627ec in host_memory_backend_memory_complete (uc=<optimized out>, errp=0x7fffffffdf90) at backends/hostmem.c:291 #6 0x0000555555736185 in object_add (type=<optimized out>, id=0x5555561904c0 "ram-node0", qdict=qdict@entry=0x555556190d50, v=0x555556190c50, errp=errp@entry=0x7fffffffdfe8) at qmp.c:630 #7 0x0000555555724174 in object_create (opts=<optimized out>, opaque=<optimized out>) at vl.c:2899 #8 0x000055555589079b in qemu_opts_foreach (list=<optimized out>, func=func@entry=0x555555723fd0 <object_create>, opaque=opaque@entry=0x0, abort_on_failure=abort_on_failure@entry=0) at util/qemu-option.c:1072 #9 0x000055555561d08c in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4240 (gdb) #0 0x00007ffff1a075e9 in raise () from /lib64/libc.so.6 #1 0x00007ffff1a08cf8 in abort () from /lib64/libc.so.6 #2 0x0000555555622eca in qemu_get_ram_block (addr=<optimized out>) at /usr/src/debug/qemu-2.1.2/exec.c:797 #3 0x0000555555625119 in qemu_get_ram_ptr (addr=18446744073709547520) at /usr/src/debug/qemu-2.1.2/exec.c:1512 #4 0x0000555555658ce7 in memory_region_get_ram_ptr (mr=mr@entry=0x555556192290) at /usr/src/debug/qemu-2.1.2/memory.c:1458 #5 0x00005555557627ec in host_memory_backend_memory_complete (uc=<optimized out>, errp=0x7fffffffdf90) at backends/hostmem.c:291 #6 0x0000555555736185 in object_add (type=<optimized out>, id=0x5555561904c0 "ram-node0", qdict=qdict@entry=0x555556190d50, v=0x555556190c50, errp=errp@entry=0x7fffffffdfe8) at qmp.c:630 #7 0x0000555555724174 in object_create (opts=<optimized out>, opaque=<optimized out>) at vl.c:2899 #8 0x000055555589079b in qemu_opts_foreach (list=<optimized out>, func=func@entry=0x555555723fd0 <object_create>, opaque=opaque@entry=0x0, abort_on_failure=abort_on_failure@entry=0) at util/qemu-option.c:1072 #9 0x000055555561d08c in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4240 (gdb) #0 0x00007ffff1a075e9 in raise () from /lib64/libc.so.6 #1 0x00007ffff1a08cf8 in abort () from /lib64/libc.so.6 #2 0x0000555555622eca in qemu_get_ram_block (addr=<optimized out>) at /usr/src/debug/qemu-2.1.2/exec.c:797 #3 0x0000555555625119 in qemu_get_ram_ptr (addr=18446744073709547520) at /usr/src/debug/qemu-2.1.2/exec.c:1512 #4 0x0000555555658ce7 in memory_region_get_ram_ptr (mr=mr@entry=0x555556192290) at /usr/src/debug/qemu-2.1.2/memory.c:1458 #5 0x00005555557627ec in host_memory_backend_memory_complete (uc=<optimized out>, errp=0x7fffffffdf90) at backends/hostmem.c:291 #6 0x0000555555736185 in object_add (type=<optimized out>, id=0x5555561904c0 "ram-node0", qdict=qdict@entry=0x555556190d50, v=0x555556190c50, errp=errp@entry=0x7fffffffdfe8) at qmp.c:630 #7 0x0000555555724174 in object_create (opts=<optimized out>, opaque=<optimized out>) at vl.c:2899 #8 0x000055555589079b in qemu_opts_foreach (list=<optimized out>, func=func@entry=0x555555723fd0 <object_create>, opaque=opaque@entry=0x0, abort_on_failure=abort_on_failure@entry=0) at util/qemu-option.c:1072 #9 0x000055555561d08c in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4240 Expected results: qemu-kvm-rhev show correctly and friendly error message. shouldn't core dump. Additional info: libivrt hit the same issue.