fix segfault by "bt" command with offline cpus

0001-arm64-Fix-segfault-by-bt-command-with-offline-cpus.patch

@@ -0,0 +1,62 @@
+From 1a1fd21c625cb2ca335e626eb50426f13c4160f7 Mon Sep 17 00:00:00 2001
+From: Kazuhito Hagio <k-hagio-ab@nec.com>
+Date: Wed, 26 Jan 2022 06:07:00 +0000
+Subject: [PATCH] arm64: Fix segfault by "bt" command with offline cpus
+
+Currently on arm64, NT_PRSTATUS notes in dumpfile are not mapped to
+online cpus and machine_specific->panic_task_regs correctly.  As a
+result, the "bt" command can cause a segmentation fault.
+
+  crash> bt -c 0
+  PID: 0      TASK: ffff8000117fa240  CPU: 0   COMMAND: "swapper/0"
+  Segmentation fault (core dumped)
+
+To fix this,
+1) make map_cpus_to_prstatus_kdump_cmprs() map the notes to
+   dd->nt_prstatus_percpu also on arm64, and
+2) move arm64_get_crash_notes() to machdep_init(POST_INIT) in order
+   to apply the mapping to machine_specific->panic_task_regs.
+
+Resolves: https://github.com/crash-utility/crash/issues/105
+Reported-by: xuchunmei000 <xuchunmei@linux.alibaba.com>
+Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
+Tested-by: David Wysochanski <dwysocha@redhat.com>
+
+Conflict:adapt context.
+Reference:https://github.com/crash-utility/crash/commit/1a1fd21c625cb2ca335e626eb50426f13c4160f7
+
+---
+ arm64.c    | 2 +-
+ diskdump.c | 3 +--
+ 2 files changed, 2 insertions(+), 3 deletions(-)
+
+diff --git a/arm64.c b/arm64.c
+index 23c3d75..4f2c2b5 100644
+--- a/arm64.c
++++ b/arm64.c
+@@ -472,7 +472,7 @@ arm64_init(int when)
+ 		arm64_sdei_stack_init();
+ 		break;
+ 
+-	case POST_VM:
++	case POST_INIT:
+ 		/*
+ 		 * crash_notes contains machine specific information about the
+ 		 * crash. In particular, it contains CPU registers at the time
+diff --git a/diskdump.c b/diskdump.c
+index 112f769..690b424 100644
+--- a/diskdump.c
++++ b/diskdump.c
+@@ -111,8 +111,7 @@ map_cpus_to_prstatus_kdump_cmprs(void)
+ 	if (pc->flags2 & QEMU_MEM_DUMP_COMPRESSED)  /* notes exist for all cpus */
+ 		goto resize_note_pointers;
+ 
+-	if (!(online = get_cpus_online()) || (online == kt->cpus) || 
+-	    machine_type("ARM64"))
++	if (!(online = get_cpus_online()) || (online == kt->cpus))
+ 		goto resize_note_pointers;
+ 
+ 	if (CRASHDEBUG(1))
+-- 
+2.33.0
+

crash.spec

@@ -1,6 +1,6 @@
 Name: crash
 Version: 7.3.0
-Release: 11
+Release: 12
 Summary: Linux kernel crash utility.
 License: GPLv3
 URL: https://crash-utility.github.io
@@ -21,6 +21,7 @@ Patch9: 0008-arm64-fix-backtraces-of-KASAN-kernel-dumpfile-truncated.patch
 Patch10: 0009-Add-lowercase-tcr_el1_t1sz.patch
 Patch11: 0010-Fix-kmem-option-on-Linux-5.7-and-later.patch
 Patch12: 0011-Fix-macro-TIF_SIGPENDING-values.patch
+Patch13: 0001-arm64-Fix-segfault-by-bt-command-with-offline-cpus.patch
 
 BuildRequires: ncurses-devel zlib-devel lzo-devel snappy-devel
 BuildRequires: gcc gcc-c++ bison m4
@@ -86,6 +87,9 @@ install -D -m 0644 defs.h %{buildroot}%{_includedir}/%{name}/defs.h
 %{_mandir}/man8/crash.8*
 
 %changelog
+* Wed Jan 4 2023 lijianglin<lijianglin2@huawei.com> - 7.3.0-12
+- fix segfault by "bt" command with offline cpus
+
 * Thu Dec 29 2022 huskartang <tanly6@chinatelecom.cn> - 7.3.0-11
 - Fix the value of TIF_SIGPENDING macro