From: Don Slutz <dslutz@xxxxxxxxxxx> Currently crash 4.0 and later using the code: http://lists.xen.org/archives/html/xen-devel/2013-11/msg02569.html There is some very limited documention on crashes remote ptotocol in: http://lists.xen.org/archives/html/xen-devel/2013-11/msg02352.html and some fixes in the attachment 0001-xen-crashd-Connect-crash-with-domain.patch from the 1st link above. How ever there are issues with the current code: 1) The remote protocol has a minor issue (which I have not been able to happen) based on the fact TCP/IP is stream based protocol. This means a RECV or a SEND may not do the fully requested size of data. In fact the current code assumes that the amount of data that a SEND is called with will all be read with a single RECV. 2) The most common mismatch between crash and older kernels is phys_base. In the remote case, see if the remote server supports vitrual memory access, and if so, see if phys_base can be retreived. 3) crash assumes that the remote system is active and can not return currect IP and SP to do a better back trace. 4) enable a non-active mode of remote access. This patch set attempts to fix these: The fix for #1 I have called NIL mode (patch 1). The fix for #2 uses get_remote_phys_base (patch 3). The fix for #3 uses get_remote_regs (patch 5). The fix for #4 uses special fake file /dev/xenmem (patch 7). It also REMOTE_PAUSED() to indicate "remote paused system". changes v1 to v2: Daniel Kiper: remove all camelCase. remove Emacs directives. Dave Anderson: rework flags, and time of changes. change get_remote_regs() to return non-zero when it successfully gets the registers. fix "make warn" warnings remove Emacs directives. Don Slutz (7): Add NIL mode to remote. remote_proc_version: NULL terminate passed buffer on error. Add get_remote_phys_base. Add remote_vtop. bt: get remote live registers if possible. Add get_remote_cr3 Add support for non-live remote. defs.h | 8 +- kernel.c | 13 +- memory.c | 13 +- remote.c | 464 +++++++++++++++++++++++++++++++++++++++++++++++++++++---------- x86_64.c | 12 ++ 5 files changed, 430 insertions(+), 80 deletions(-) -- 1.8.4 -- Crash-utility mailing list Crash-utility@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/crash-utility
