Re: kernel core debugging
- Reply: tuexen_a_freebsd.org: "Re: kernel core debugging"
- In reply to: tuexen_a_freebsd.org: "kernel core debugging"
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Date: Wed, 06 Nov 2024 15:12:44 UTC
On Nov 6, 2024, at 01:44, tuexen@freebsd.org <tuexen@FreeBSD.org> wrote: > is debugging a kernel panic by using kgdb or lldb on a core file > supposed to work? At least it is not right now for me... # kgdb /boot/kernel.GENERIC-NODEBUG/kernel /var/crash/vmcore.2 GNU gdb (GDB) 15.1 [GDB v15.1 for FreeBSD] Copyright (C) 2024 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "aarch64-portbld-freebsd15.0". Type "show configuration" for configuration details. For bug reporting instructions, please see: <https://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from /boot/kernel.GENERIC-NODEBUG/kernel... Reading symbols from /usr/lib/debug//boot/kernel.GENERIC-NODEBUG/kernel.debug... Unread portion of the kernel message buffer: KDB: enter: manual escape to debugger Reading symbols from /boot/kernel.GENERIC-NODEBUG/uhid.ko... Reading symbols from /usr/lib/debug//boot/kernel.GENERIC-NODEBUG/uhid.ko.debug... Reading symbols from /boot/kernel.GENERIC-NODEBUG/wmt.ko... Reading symbols from /usr/lib/debug//boot/kernel.GENERIC-NODEBUG/wmt.ko.debug... Reading symbols from /boot/kernel.GENERIC-NODEBUG/ums.ko... Reading symbols from /usr/lib/debug//boot/kernel.GENERIC-NODEBUG/ums.ko.debug... Reading symbols from /boot/kernel.GENERIC-NODEBUG/zfs.ko... Reading symbols from /usr/lib/debug//boot/kernel.GENERIC-NODEBUG/zfs.ko.debug... 0xffff00000050f3f0 in doadump (textdump=0, textdump@entry=212431136) at /home/pkgbuild/worktrees/main/sys/kern/kern_shutdown.c:404 warning: 404 /home/pkgbuild/worktrees/main/sys/kern/kern_shutdown.c: No such file or directory (kgdb) bt #0 0xffff00000050f3f0 in doadump (textdump=0, textdump@entry=212431136) at /home/pkgbuild/worktrees/main/sys/kern/kern_shutdown.c:404 #1 0xffff0000000ee6a8 in db_dump (dummy=<optimized out>, dummy2=<optimized out>, dummy3=<optimized out>, dummy4=<optimized out>) at /home/pkgbuild/worktrees/main/sys/ddb/db_command.c:596 #2 0xffff0000000ee478 in db_command (last_cmdp=<optimized out>, cmd_table=<optimized out>, dopager=true) at /home/pkgbuild/worktrees/main/sys/ddb/db_command.c:508 #3 0xffff0000000ee150 in db_command_loop () at /home/pkgbuild/worktrees/main/sys/ddb/db_command.c:555 #4 0xffff0000000f1ff4 in db_trap (type=<optimized out>, code=<optimized out>) at /home/pkgbuild/worktrees/main/sys/ddb/db_main.c:267 #5 0xffff000000568b0c in kdb_trap (type=60, code=0, tf=<optimized out>) at /home/pkgbuild/worktrees/main/sys/kern/subr_kdb.c:790 #6 <signal handler called> #7 kdb_enter (why=<optimized out>, msg=<optimized out>) at /home/pkgbuild/worktrees/main/sys/kern/subr_kdb.c:556 #8 0xffff0000003625cc in vt_machine_kbdevent (vd=<optimized out>, c=<optimized out>) at /home/pkgbuild/worktrees/main/sys/dev/vt/vt_core.c:761 #9 vt_processkey (kbd=0xffffa000803caa80, vd=0xffff000000d24360 <vt_consdev>, c=-2147483514) at /home/pkgbuild/worktrees/main/sys/dev/vt/vt_core.c:903 #10 vt_kbdevent (kbd=0xffffa000803caa80, event=<optimized out>, arg=0xffff000000d24360 <vt_consdev>) at /home/pkgbuild/worktrees/main/sys/dev/vt/vt_core.c:1030 #11 0xffff0000001ea048 in kbdmux_intr (kbd=0xffffa000803caa80, arg=<optimized out>) at /home/pkgbuild/worktrees/main/sys/dev/kbdmux/kbdmux.c:565 #12 0xffff0000005839ac in taskqueue_run_locked (queue=queue@entry=0xffffa000803c9c00) at /home/pkgbuild/worktrees/main/sys/kern/subr_taskqueue.c:517 #13 0xffff000000583714 in taskqueue_run (queue=0xffffa000803c9c00) at /home/pkgbuild/worktrees/main/sys/kern/subr_taskqueue.c:532 #14 0xffff0000004bc114 in intr_event_execute_handlers (ie=0xffffa0008028ec00, p=<optimized out>) at /home/pkgbuild/worktrees/main/sys/kern/kern_intr.c:1183 #15 ithread_execute_handlers (ie=0xffffa0008028ec00, p=<optimized out>) at /home/pkgbuild/worktrees/main/sys/kern/kern_intr.c:1196 #16 ithread_loop (arg=<optimized out>, arg@entry=0xffffa000803de5a0) at /home/pkgbuild/worktrees/main/sys/kern/kern_intr.c:1289 #17 0xffff0000004b700c in fork_exit (callout=0xffff0000004bbd78 <ithread_loop>, arg=0xffffa000803de5a0, frame=0xffff00010ca97a00) at /home/pkgbuild/worktrees/main/sys/kern/kern_fork.c:1151 #18 <signal handler called> The context here was from an official PkgBase kernel and world installation. I'll note that, if I reference the wrong kernel file, I get the likes of: # kgdb /boot/kernel/kernel /var/crash/vmcore.2 . . . Reading symbols from /boot/kernel/kernel... Reading symbols from /usr/lib/debug//boot/kernel/kernel.debug... /wrkdirs/usr/ports/devel/gdb/work-py311/gdb-15.1/gdb/thread.c:1423: internal-error: switch_to_thread: Assertion `thr != NULL' failed. A problem internal to GDB has been detected, further debugging may prove unreliable. ----- Backtrace ----- 0x13147fb ??? 0x1777763 ??? 0x1777593 ??? 0x1c09bbf ??? 0x1733af7 ??? 0x143c9d3 ??? 0x1707483 ??? 0x13468db ??? 0x17405a3 ??? 0x1505f7b ??? 0x1504bd7 ??? 0x150352f ??? 0x1226b47 ??? 0x2ee9ca33 __libc_start1 /home/pkgbuild/worktrees/main/lib/libc/csu/libc_start1.c:172 0x12261cb ??? --------------------- /wrkdirs/usr/ports/devel/gdb/work-py311/gdb-15.1/gdb/thread.c:1423: internal-error: switch_to_thread: Assertion `thr != NULL' failed. A problem internal to GDB has been detected, further debugging may prove unreliable. Quit this debugging session? (y or n) y . . . You may have to be more explicit about the specific of the problem(s) you are seeing. For reference: # uname -apKU FreeBSD aarch64-main-PBsmallUFS 15.0-CURRENT FreeBSD 15.0-CURRENT main-n273174-8b2e7da70855 GENERIC arm64 aarch64 1500026 1500026 # ~/pkgbase-snapshot-list.sh Via pkg-static info -C -x '^FreeBSD-' . . . 352 FreeBSD-*-15.snap20241023235252 1 FreeBSD-*-15.snap20241022122410 1 FreeBSD-*-15.snap20241020224518 1 FreeBSD-*-15.snap20241020094723 7 FreeBSD-*-15.snap20241015203742 1 FreeBSD-*-15.snap20241015145839 1 FreeBSD-*-15.snap20241015120827 1 FreeBSD-*-15.snap20241014101436 34 FreeBSD-*-15.snap20241011184813 129 FreeBSD-*-15.snap20241009162208 Instead via /var/cache/pkg/*.snap*.pkg . . . 352 FreeBSD-*-15.snap20241023235252 1 FreeBSD-*-15.snap20241022122410 1 FreeBSD-*-15.snap20241020224518 1 FreeBSD-*-15.snap20241020094723 7 FreeBSD-*-15.snap20241015203742 1 FreeBSD-*-15.snap20241015145839 1 FreeBSD-*-15.snap20241015120827 1 FreeBSD-*-15.snap20241014101436 34 FreeBSD-*-15.snap20241011184813 129 FreeBSD-*-15.snap20241009162208 # pkg info gdb gdb-15.1 Name : gdb Version : 15.1 Installed on : Mon Oct 14 10:30:51 2024 PDT Origin : devel/gdb Architecture : FreeBSD:15:aarch64 Prefix : /usr/local Categories : devel Licenses : GPLv3 Maintainer : pizzamig@FreeBSD.org WWW : https://www.gnu.org/software/gdb/ Comment : GNU Project Debugger Options : BUNDLED_READLINE: off BUNDLED_ZLIB : off DEBUGINFOD : off GDB_LINK : on GUILE : off KGDB : on NLS : on PORT_ICONV : on PORT_READLINE : on PYTHON : on SOURCE_HIGHLIGHT: on SYSTEM_ICONV : off SYSTEM_ZLIB : on TUI : on XXHASH : on Shared Libs required: libzstd.so.1 libxxhash.so.0 libsource-highlight.so.4 libreadline.so.8 libpython3.11.so.1.0 libmpfr.so.6 libintl.so.8 libiconv.so.2 libgmp.so.10 libexpat.so.1 libboost_regex.so.1.85.0 Annotations : FreeBSD_version: 1500024 build_timestamp: 2024-10-07T19:01:59+0000 built_by : poudriere-git-3.4.2 cpe : cpe:2.3:a:gnu:gdb:15.1:::::freebsd15:aarch64 flavor : py311 port_checkout_unclean: no port_git_hash : 82beca9e630 ports_top_checkout_unclean: no ports_top_git_hash: 149fe86b8e7 repo_type : binary repository : FreeBSD Flat size : 58.5MiB Description : GDB is a source-level debugger for Ada, C, C++, Objective-C, Pascal and many other languages. GDB can target (i.e., debug programs running on) more than a dozen different processor architectures, and GDB itself can run on most popular GNU/Linux, Unix and Microsoft Windows variants. It was from installing an officially built package. === Mark Millard marklmi at yahoo.com