Red Hat Bugzilla – Bug 462380
qemu-kvm -no-kvm segfaults with >4GB of RAM
Last modified: 2009-12-18 01:23:46 EST
Version-Release number of selected component (if applicable):
Steps to Reproduce:
[root@Rawhide-64 ~]# gdb --args qemu-kvm -no-kvm -m 5000 -hda /mnt/common/images/f9-64f.img
GNU gdb Fedora (6.8-19.fc10)
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Starting program: /usr/bin/qemu-kvm -no-kvm -m 5000 -hda /mnt/common/images/f9-64f.img
Program received signal SIGSEGV, Segmentation fault.
tb_alloc_page () at /usr/src/debug/kvm-74/qemu/exec.c:1081
This happens because the translation block code doesn't support addresses larger than 32-bits on the l1_map array.
(gdb) bt full
#0 tb_alloc_page () at /usr/src/debug/kvm-74/qemu/exec.c:1081
p = (PageDesc *) 0x5a1
last_first_tb = <value optimized out>
#1 tb_link_phys (tb=0x7f4782017f10, phys_pc=5201186336, phys_page2=18446744073709551615) at /usr/src/debug/kvm-74/qemu/exec.c:1171
#2 0x00000000004a35ef in tb_gen_code (env=0x299c0d0, pc=139904157867552, cs_base=<value optimized out>, flags=<value optimized out>, cflags=<value optimized out>)
tb = (TranslationBlock *) 0x7f4782017f10
phys_page2 = 1
virt_page2 = 139904157863936
code_gen_size = <value optimized out>
#3 0x00000000004a5ce9 in tb_find_slow () at /usr/src/debug/kvm-74/qemu/cpu-exec.c:157
#4 tb_find_fast () at /usr/src/debug/kvm-74/qemu/cpu-exec.c:238
cs_base = 6
pc = 139904157867552
flags = 115383
#5 cpu_x86_exec (env1=<value optimized out>) at /usr/src/debug/kvm-74/qemu/cpu-exec.c:597
reg_AREG0 = <value optimized out>
saved_AREG0 = (volatile host_reg_t) 0x0
reg_AREG1 = <value optimized out>
saved_AREG1 = (volatile host_reg_t) 0x7ffff57c8a00
reg_AREG2 = <value optimized out>
saved_AREG2 = (volatile host_reg_t) 0x1
reg_AREG3 = <value optimized out>
saved_AREG3 = (volatile host_reg_t) 0xffff
ret = <value optimized out>
interrupt_request <value optimized out>
tb = (TranslationBlock *) 0x0
next_tb = 0
#6 0x0000000000412372 in main_loop () at /usr/src/debug/kvm-74/qemu/vl.c:8213
#7 main (argc=6, argv=0x7ffff57c94a8) at /usr/src/debug/kvm-74/qemu/vl.c:10130
http://koji.fedoraproject.org/koji/taskinfo?taskID=826758 should fix it.
The page_find() fix you included needs the fix from qemu svn revision 5104, also (http://svn.savannah.gnu.org/viewvc/trunk/exec.c?root=qemu&r1=5104&r2=5103&pathrev=5104).
However, neither of them fix the segfault for the -no-kvm case, but only avoid some uncommon segfaults when running KVM, such as on the backtrace shown here: http://marc.info/?l=kvm&m=122124602701405&w=2
This bug appears to have been reported against 'rawhide' during the Fedora 10 development cycle.
Changing version to '10'.
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