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Re: [linux-lvm] lvcreate segfault in vg_setup_pointers_for_snapshots



doh...

this is 0.9.1beta7, on stock kernel 2.4.9 + LVM 0.9.1beta7 + ext3 + NFS fixups

On Wed, 3 Oct 2001, Paul Jakma wrote:

> hi,
> 
> running lvcreate consistently segfaults on me, eg:
> 
>  /lib/lvm-iop10/lvcreate -L 600M -n var_cache_lv Main_VG
> 
> 
> #0  0x4004500b in vg_setup_pointers_for_snapshots (vg=0x8058038)
>     at vg_setup_pointers_for_snapshots.c:37
> 37	      if ( lv_chain_ptr->lv_access & LV_SNAPSHOT_ORG) {
> (gdb) bt
> #0  0x4004500b in vg_setup_pointers_for_snapshots (vg=0x8058038)
>     at vg_setup_pointers_for_snapshots.c:37
> #1  0x40045d0d in vg_status_with_pv_and_lv (vg_name=0xbffffbe3 "Main_VG", 
>     vg=0xbffff254) at vg_status_with_pv_and_lv.c:63
> #2  0x0804abbd in strcpy ()
> #3  0x400767c7 in __libc_start_main (main=0x8049370 <strcpy+272>, argc=6, 
>     ubp_av=0xbffffaa4, init=0x8048ea8 <_init>, fini=0x804beb0 <_fini>, 
>     rtld_fini=0x4000db74 <_dl_fini>, stack_end=0xbffffa9c)
>     at ../sysdeps/generic/libc-start.c:129
> (gdb) print *vg          
> $3 = {vg_name = "Main_VG", '\000' <repeats 120 times>, vg_number = 0, 
>   vg_access = 3, vg_status = 5, lv_max = 256, lv_cur = 6, lv_open = 5, 
>   pv_max = 256, pv_cur = 2, pv_act = 2, dummy = 0, vgda = 0, pe_size = 8192, 
>   pe_total = 3690, pe_allocated = 849, pvg_total = 0, proc = 0x0, pv = {
>     0xc7c83800, 0xc7c83a00, 0x0 <repeats 255 times>}, lv = {0xc7c83c00, 
>     0xc7c83e00, 0xc65e3000, 0xc65e3200, 0xc65e3400, 0xc65e3600, 
>     0x0 <repeats 251 times>}, vg_uuid = "Main_VG", '\000' <repeats 25 times>, 
>   dummy1 = "\000\000\000`®ÐÇ`­ÐÇ`¬ÐÇ", '\000' <repeats 184 times>}
> (gdb) print *lv_chain_ptr
> Cannot access memory at address 0xc7c83c00
> 
> and boom...
> 
> any fixes for this? i've tried compiling with both RH's compat-egcs 
> and gcc-2.96-97 compilers, same result each time.
> 
> ta,
> 
> --paulj

--paulj




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