----- Original Message ----- Have you loaded the debuginfo data of the kernel module into the crash session? For example, in the "fs/nfs/mount_clnt.c" kernel module there is this declaration: static struct rpc_stat mnt_stats; Without loading the debuginfo data of the "nfs" module, there is only minimal information available about the data structure instance, namely just its virtual address, its section, and the module that it's contained within: crash> sym mnt_stats ffffffffa086bca0 (b) mnt_stats [nfs] crash> p mnt_stats p: gdb request failed: p mnt_stats crash> whatis mnt_stats whatis: gdb request failed: whatis mnt_stats crash> Loading the debuginfo data of the module (usually) brings in the additional information into the crash session: crash> mod -s nfs MODULE NAME SIZE OBJECT FILE ffffffffa086b920 nfs 169344 /lib/modules/3.9.10-100.fc17.x86_64/kernel/fs/nfs/nfs.ko crash> whatis mnt_stats struct rpc_stat mnt_stats; crash> p mnt_stats mnt_stats = $2 = { program = 0x0, netcnt = 0, netudpcnt = 0, nettcpcnt = 0, nettcpconn = 0, netreconn = 3, rpccnt = 6, rpcretrans = 0, rpcauthrefresh = 6, rpcgarbage = 0 } crash> Dave