[linux-lvm] 1.0.1-rc2 lvcreate segfaults, pvcreate, vgcreate ok

[Jim Cromie <jcromie@divsol.com>]

I recently pulled 2.4.10, built, installed, and tested ok on a Redhat 7.1
machine.

then I activated LVM module config, applied 1.0.1-rc2 LVM patches,
rebuilt,
manually corrected 3-ary max(), min() s to 2 arg version, as per

http://lists.sistina.com/pipermail/lvm-devel/2001-September/000657.html


reboot works, insmod lvm-mod installs module as expected,
pvcreate, vgcreate both worked..

lvcreate segfaults however, apparently after nearly completing the LV
setup.

# gdb /sbin/lvcreate
(gdb) r -d -L1000 -nVL_test VG_test
....
<55555> pv_check_new -- CALLED
<55555> pv_check_new -- LEAVING with ret: 0
<4444> pv_check_consistency -- LEAVING with ret: 0
<333> lv_check_on_pv -- LEAVING with ret: 1
<22> pv_reserve_pe -- LEAVING with ret: 0
<1> lv_setup_for_create -- pv_reserve_pe returned: 0   pe_last: 250  pe:
0
<1> lv_setup_for_create -- pe: 0
<1> lv_setup_for_create -- LEAVING with ret: 0
<1> lvm_dont_interrupt -- CALLED
<1> lvm_dont_interrupt -- LEAVING

Program received signal SIGSEGV, Segmentation fault.
lv_create (vg=0x5, lv=0xbffff9f4,
    lv_name=0xbffffa0c
":ûÿ¿Rûÿ¿nûÿ¿\203ûÿ¿\233ûÿ¿½ûÿ¿Üûÿ¿èûÿ¿òûÿ¿µýÿ¿Ôýÿ¿îýÿ¿\003þÿ¿\032þÿ¿%þÿ¿0þÿ¿=þÿ¿Eþÿ¿Uþÿ¿cþÿ¿qþÿ¿\202þÿ¿\220þÿ¿²þÿ¿Ëþÿ¿Öþÿ¿áþÿ¿\024ÿÿ¿")
at lv_create_remove.c:42
42 int lv_create ( vg_t *vg, lv_t *lv, char *lv_name) {
(gdb) bt
#0  lv_create (vg=0x5, lv=0xbffff9f4,
    lv_name=0xbffffa0c
":ûÿ¿Rûÿ¿nûÿ¿\203ûÿ¿\233ûÿ¿½ûÿ¿Üûÿ¿èûÿ¿òûÿ¿µýÿ¿Ôýÿ¿îýÿ¿\003þÿ¿\032þÿ¿%þÿ¿0þÿ¿=þÿ¿Eþÿ¿Uþÿ¿cþÿ¿qþÿ¿\202þÿ¿\220þÿ¿²þÿ¿Ëþÿ¿Öþÿ¿áþÿ¿\024ÿÿ¿")
at lv_create_remove.c:42
#1  0x0804b03d in strcpy () at ../sysdeps/generic/strcpy.c:31
#2  0x40079177 in __libc_start_main (main=0x8049390 <strcpy+384>, argc=5,
ubp_av=0xbffff9f4, init=0x8048e88 <_init>,
    fini=0x804b4d0 <_fini>, rtld_fini=0x4000e184 <_dl_fini>,
stack_end=0xbffff9ec) at ../sysdeps/generic/libc-start.c:129
(gdb)
(gdb) list
37
38 /* internal function */
39 int lv_create_remove ( vg_t *, lv_t *, char *, int);
40
41
42 int lv_create ( vg_t *vg, lv_t *lv, char *lv_name) {
43    return lv_create_remove ( vg, lv, lv_name, LV_CREATE);
44 }
45
46
(gdb)

(gdb) up
#1  0x0804b03d in strcpy () at ../sysdeps/generic/strcpy.c:31
31 ../sysdeps/generic/strcpy.c: No such file or directory.
 in ../sysdeps/generic/strcpy.c


Apriori, it looks like lv_name is uninitialized.  But it runs pretty far
before choking.

looking deeper;

(gdb) b lv_create
(gdb) b strcpy
(gdb) r
....
<4444> lv_check_consistency_all_lv -- vg->lv[245]: 0  name: (null)
<4444> lv_check_consistency_all_lv -- vg->lv[246]: 0  name: (null)
<4444> lv_check_consistency_all_lv -- vg->lv[247]: 0  name: (null)
<4444> lv_check_consistency_all_lv -- vg->lv[248]: 0  name: (null)
<4444> lv_check_consistency_all_lv -- vg->lv[249]: 0  name: (null)
<4444> lv_check_consistency_all_lv -- vg->lv[250]: 0  name: (null)
<4444> lv_check_consistency_all_lv -- vg->lv[251]: 0  name: (null)
<4444> lv_check_consistency_all_lv -- vg->lv[252]: 0  name: (null)
<4444> lv_check_consistency_all_lv -- vg->lv[253]: 0  name: (null)
<4444> lv_check_consistency_all_lv -- vg->lv[254]: 0  name: (null)
<4444> lv_check_consistency_all_lv -- LEAVING with ret: 0
<333> vg_check_consistency_with_pv_and_lv -- LEAVING with ret: 0
<22> vg_cfgrestore -- LEAVING with ret: 0
<1> lvm_tab_vg_check_exist -- before vg.pv_cur check with vg.pv_cur: 1
pv_count: 1
<22> vg_free -- CALLED
<22> vg_free -- entering PV loop
<22> vg_free -- entering LV loop
<22> vg_free -- LEAVING with ret: 0
<1> lvm_tab_vg_check_exist -- LEAVING with ret: 1
<1> vg_check_active -- CALLED with VG: VG_test
<22> vg_check_name -- CALLED with VG: VG_test
<333> lvm_check_chars -- CALLED with name: "VG_test"
<333> lvm_check_chars -- LEAVING with ret: 0
<22> vg_check_name -- LEAVING with ret: 0
<22> vg_status -- CALLED with VG: VG_test
<333> vg_check_name -- CALLED with VG: VG_test
<4444> lvm_check_chars -- CALLED with name: "VG_test"
<4444> lvm_check_chars -- LEAVING with ret: 0
<333> vg_check_name -- LEAVING with ret: 0
<22> vg_status -- LEAVING with ret: 0
<1> vg_check_active -- LEAVING with ret: 1
<1> lv_check_name -- CALLED with lv_name: "/dev/VG_test/VL_test"
<22> lvm_check_chars -- CALLED with name: "/dev/VG_test/VL_test"
<22> lvm_check_chars -- LEAVING with ret: 0

Breakpoint 1, strcpy (dest=0xbfffecc0
"dm\001@õÚÑ\013\2137\001@0íÿ¿\020l\001@Ñ\210\004\bìq\001@ÿÿÿÿ",
    src=0xbffff650 "/dev/VG_test/VL_test") at
../sysdeps/generic/strcpy.c:34
34 ../sysdeps/generic/strcpy.c: No such file or directory.
 in ../sysdeps/generic/strcpy.c
(gdb)
(gdb) frame
#0  strcpy (dest=0xbfffecc0
"dm\001@õÚÑ\013\2137\001@0íÿ¿\020l\001@Ñ\210\004\bìq\001@ÿÿÿÿ",
src=0xbffff650 "/dev/VG_test/VL_test")
    at ../sysdeps/generic/strcpy.c:34
34 in ../sysdeps/generic/strcpy.c
(gdb)

so - string is initialized, at least to start


I cant get any more insight at this time, HTH