Re: [PATCH v1 1/3] ppc64: Fix bt printing error stack trace
by lijiang
Hi, Tao
Thank you for the fix.
On Wed, Sep 18, 2024 at 7:44 AM <devel-request(a)lists.crash-utility.osci.io>
wrote:
> Date: Wed, 18 Sep 2024 11:42:03 +1200
> From: Tao Liu <ltao(a)redhat.com>
> Subject: [Crash-utility] [PATCH v1 1/3] ppc64: Fix bt printing error
> stack trace
> To: devel(a)lists.crash-utility.osci.io
> Cc: adityag(a)linux.ibm.com, Tao Liu <ltao(a)redhat.com>
> Message-ID: <20240917234205.7783-2-ltao(a)redhat.com>
> Content-Type: text/plain; charset="US-ASCII"; x-default=true
>
> A error stack trace of bt cmd observed:
>
> crash> bt 1
> PID: 1 TASK: c000000003714b80 CPU: 2 COMMAND: "systemd"
> #0 [c0000000037735c0] _end at c0000000037154b0 (unreliable)
> #1 [c000000003773770] __switch_to at c00000000001fa9c
> #2 [c0000000037737d0] __schedule at c00000000112e4ec
> #3 [c0000000037738b0] schedule at c00000000112ea80
> ...
>
> The #0 stack trace is incorrect, the function address shouldn't exceed
> _end.
> The reason is for kernel>=v6.2, the offset of pt_regs to sp changed from
> STACK_FRAME_OVERHEAD, i.e 112, to STACK_SWITCH_FRAME_REGS. For
> CONFIG_PPC64_ELF_ABI_V1, it's 112, for ABI_V2, it's 48. So the nip will
> read a
> wrong value from stack when ABI_V2 enabled.
>
>
Can you help to add the related kernel commits to patch log? That will help
me a lot to review the patches.
> To determine if ABI_V2 enabled is tricky. This patch do it by check the
> following:
>
Can you try to read the value of e_flags from the elf header and to
determine what ABI version it is?
Thanks
Lianbo
>
> In arch/powerpc/include/asm/ppc_asm.h:
> #ifdef CONFIG_PPC64_ELF_ABI_V2
> #define STK_GOT 24
> #else
> #define STK_GOT 40
>
> In arch/powerpc/kernel/tm.S:
> _GLOBAL(tm_reclaim)
> mfcr r5
> mflr r0
> stw r5, 8(r1)
> std r0, 16(r1)
> std r2, STK_GOT(r1)
> ...
>
> So a disassemble on tm_reclaim, and extract the STK_GOT value from std
> instruction is used as the approach.
>
> After the patch:
> crash> bt 1
> PID: 1 TASK: c000000003714b80 CPU: 2 COMMAND: "systemd"
> #0 [c0000000037737d0] __schedule at c00000000112e4ec
> #1 [c0000000037738b0] schedule at c00000000112ea80
> ...
>
> Signed-off-by: Tao Liu <ltao(a)redhat.com>
> ---
> defs.h | 1 +
> ppc64.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++---
> 2 files changed, 58 insertions(+), 3 deletions(-)
>
> diff --git a/defs.h b/defs.h
> index 2231cb6..d5cb8cc 100644
> --- a/defs.h
> +++ b/defs.h
> @@ -4643,6 +4643,7 @@ struct efi_memory_desc_t {
> #define MSR_PR_LG 14 /* Problem State / Privilege Level */
> /* Used to find the user or kernel-mode
> frame*/
>
> +#define STACK_SWITCH_FRAME_REGS 48
> #define STACK_FRAME_OVERHEAD 112
> #define EXCP_FRAME_MARKER 0x7265677368657265
>
> diff --git a/ppc64.c b/ppc64.c
> index e8930a1..6e5f155 100644
> --- a/ppc64.c
> +++ b/ppc64.c
> @@ -72,6 +72,7 @@ static ulong pud_page_vaddr_l4(ulong pud);
> static ulong pmd_page_vaddr_l4(ulong pmd);
> static int is_opal_context(ulong sp, ulong nip);
> void opalmsg(void);
> +static bool is_ppc64_elf_abi_v2(void);
>
> static int is_opal_context(ulong sp, ulong nip)
> {
> @@ -2813,6 +2814,51 @@ ppc64_get_sp(ulong task)
> return sp;
> }
>
> +static bool
> +is_ppc64_elf_abi_v2(void)
> +{
> + char buf1[BUFSIZE];
> + char *pos1, *pos2;
> + int errflag = 0;
> + ulong stk_got = 0;
> + static bool ret = false;
> + static bool checked = false;
> +
> + if (checked == true || !symbol_exists("tm_reclaim"))
> + return ret;
> +
> + sprintf(buf1, "x/16i tm_reclaim");
> + open_tmpfile();
> + if (!gdb_pass_through(buf1, pc->tmpfile, GNU_RETURN_ON_ERROR))
> + goto out;
> + checked = true;
> + rewind(pc->tmpfile);
> + while (fgets(buf1, BUFSIZE, pc->tmpfile)) {
> + // "std r2, STK_GOT(r1)" is expected
> + if (strstr(buf1, "std") &&
> + strstr(buf1, "(r1)") &&
> + (pos1 = strstr(buf1, "r2,"))) {
> + pos1 += strlen("r2,");
> + for (pos2 = pos1; *pos2 != '\0' && *pos2 != '(';
> pos2++);
> + *pos2 = '\0';
> + stk_got = stol(pos1, RETURN_ON_ERROR|QUIET,
> &errflag);
> + break;
> + }
> + }
> +
> + if (!errflag) {
> + switch (stk_got) {
> + case 24:
> + ret = true;
> + case 40:
> + goto out;
> + }
> + }
> + error(WARNING, "Unstable elf_abi v1/v2 detection.\n");
> +out:
> + close_tmpfile();
> + return ret;
> +}
>
> /*
> * get the SP and PC values for idle tasks.
> @@ -2834,9 +2880,17 @@ get_ppc64_frame(struct bt_info *bt, ulong *getpc,
> ulong *getsp)
> sp = ppc64_get_sp(task);
> if (!INSTACK(sp, bt))
> goto out;
> - readmem(sp+STACK_FRAME_OVERHEAD, KVADDR, ®s,
> - sizeof(struct ppc64_pt_regs),
> - "PPC64 pt_regs", FAULT_ON_ERROR);
> +
> + if (THIS_KERNEL_VERSION >= LINUX(6,2,0) && is_ppc64_elf_abi_v2()) {
> + readmem(sp+STACK_SWITCH_FRAME_REGS, KVADDR, ®s,
> + sizeof(struct ppc64_pt_regs),
> + "PPC64 pt_regs", FAULT_ON_ERROR);
> + } else {
> + readmem(sp+STACK_FRAME_OVERHEAD, KVADDR, ®s,
> + sizeof(struct ppc64_pt_regs),
> + "PPC64 pt_regs", FAULT_ON_ERROR);
> + }
> +
> ip = regs.nip;
> closest = closest_symbol(ip);
> if (STREQ(closest, ".__switch_to") || STREQ(closest,
> "__switch_to")) {
> --
> 2.40.1
>
1 day
- 2
- 3
[PATCH v1 0/3] ppc64: A few bug fixes for 6.x kernel
by Tao Liu
There are 3 bugs, which are caused due to newer kernel change, they were
found when testing the gdb stack unwinding support[1] for ppc64 against the
6.x kernels. See the discussion in [2][3]. So they'd better to be fixed
in a batch.
Note: the NO.1 patch: "ppc64: Fix bt printing error stack trace" was
posted individually in [4], and it gets updated in this patchset.
So please review this patchset instead.
[1]: https://www.mail-archive.com/devel@lists.crash-utility.osci.io/msg01079.html
[2]: https://www.mail-archive.com/devel@lists.crash-utility.osci.io/msg01116.html
[3]: https://www.mail-archive.com/devel@lists.crash-utility.osci.io/msg01126.html
[4]: https://www.mail-archive.com/devel@lists.crash-utility.osci.io/msg01124.html
Tao Liu (3):
ppc64: Fix bt printing error stack trace
ppc64: check sp at the start of stack back trace
ppc64: fix the bug eframe won't print for newer kernel
defs.h | 6 +++-
ppc64.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++++-------
2 files changed, 102 insertions(+), 14 deletions(-)
--
2.40.1
1 day
- 2
- 13
Re: [PATCH v7 00/15] gdb stack unwinding support for crash utility
by lijiang
Hi, Tao
Thank you for the update.
The following patch is a regression issue, so I tend to discuss it as a
separate patch.
[PATCH v7 01/15] Fix the regression of cpumask_t for xen hyper
In addition, I found another issue in my tests(on ppc64le), the gdb bt can
display the back trace for the panic task, but when I switch to another
task, the gdb bt can not display the back trace:
crash> gdb bt
#0 0xc0000000002bde04 in crash_setup_regs (newregs=0xc00000003264b858,
oldregs=0x0) at ./arch/powerpc/include/asm/kexec.h:133
#1 0xc0000000002be4f8 in __crash_kexec (regs=0x0) at
kernel/crash_core.c:122
#2 0xc00000000016c254 in panic (fmt=0xc0000000015eef20 "sysrq triggered
crash\n") at kernel/panic.c:373
#3 0xc000000000a708b8 in sysrq_handle_crash (key=<optimized out>) at
drivers/tty/sysrq.c:154
#4 0xc000000000a713d4 in __handle_sysrq (key=key@entry=99 'c',
check_mask=check_mask@entry=false) at drivers/tty/sysrq.c:612
#5 0xc000000000a71e94 in write_sysrq_trigger (file=<optimized out>,
buf=<optimized out>, count=2, ppos=<optimized out>) at
drivers/tty/sysrq.c:1181
#6 0xc00000000073260c in pde_write (pde=0xc00000000af9cc00,
file=<optimized out>, buf=<optimized out>, count=<optimized out>,
ppos=<optimized out>) at fs/proc/inode.c:334
#7 proc_reg_write (file=<optimized out>, buf=<optimized out>,
count=<optimized out>, ppos=<optimized out>) at fs/proc/inode.c:346
#8 0xc00000000063c0e0 in vfs_write (file=0xc0000000092d2900,
buf=0x10012536f60 <error: Cannot access memory at address 0x10012536f60>,
count=2, pos=0xc00000003264bd30) at fs/read_write.c:588
#9 vfs_write (file=0xc0000000092d2900, buf=0x10012536f60 <error: Cannot
access memory at address 0x10012536f60>, count=<optimized out>,
pos=0xc00000003264bd30) at fs/read_write.c:570
#10 0xc00000000063c690 in ksys_write (fd=<optimized out>, buf=0x10012536f60
<error: Cannot access memory at address 0x10012536f60>, count=2) at
fs/read_write.c:643
#11 0xc000000000031a28 in system_call_exception (regs=0xc00000003264be80,
r0=<optimized out>) at arch/powerpc/kernel/syscall.c:153
#12 0xc00000000000d05c in system_call_vectored_common () at
arch/powerpc/kernel/interrupt_64.S:198
crash> ps
PID PPID CPU TASK ST %MEM VSZ RSS COMM
0 0 0 c000000002bda980 RU 0.0 0 0
[swapper/0]
> 0 0 1 c000000003864c80 RU 0.0 0 0
[swapper/1]
...
8017 923 0 c000000043a20000 IN 0.2 22528 16256
sshd-session
8025 8017 6 c000000032271880 IN 0.1 22784 11840
sshd-session
> 8026 8025 0 c000000043a26600 RU 0.1 9664 6208 bash
...
11645 2 3 c000000032264c80 ID 0.0 0 0
[kworker/u32:2]
11738 6188 2 c00000003811b180 IN 0.1 43520 9408 pickup
12326 2 0 c00000003226b280 ID 0.0 0 0
[kworker/0:1]
13112 6089 2 c00000000c809900 IN 0.0 7232 3456 sleep
Let's take the "pickup" task as an example:
crash> set 11738
PID: 11738
COMMAND: "pickup"
TASK: c00000003811b180 [THREAD_INFO: c00000003811b180]
CPU: 2
STATE: TASK_INTERRUPTIBLE
crash> gdb bt
#0 0xc0000000a7f876a0 in ?? ()
gdb: gdb request failed: bt
crash> set gdb on
gdb: on
gdb> bt
#0 0xc0000000a7f876a0 in ?? ()
gdb>
Anyway, I did the same test on x86 64 and aarch64, it can work well as
expected. Can you help to double check on ppc64 architecture?
X86 64:
crash> set 14599
PID: 14599
COMMAND: "pickup"
TASK: ffff8f57a0d7c180 [THREAD_INFO: ffff8f57a0d7c180]
CPU: 41
STATE: TASK_INTERRUPTIBLE
crash> gdb bt
#0 0xffffffff8b3efe29 in context_switch (rq=0xffff8f6f1f835900,
prev=0xffff8f57a0d7c180, next=0xffff8f5786720000, rf=0xffff9df22fea7b80) at
kernel/sched/core.c:5208
#1 __schedule (sched_mode=sched_mode@entry=0) at kernel/sched/core.c:6549
#2 0xffffffff8b3f0217 in __schedule_loop (sched_mode=<optimized out>) at
kernel/sched/core.c:6626
#3 schedule () at kernel/sched/core.c:6641
#4 0xffffffff8b3f6eef in schedule_hrtimeout_range_clock
(expires=expires@entry=0xffff9df22fea7cb0, delta=<optimized out>,
delta@entry=99999999, mode=mode@entry=HRTIMER_MODE_ABS,
clock_id=clock_id@entry=1) at kernel/time/hrtimer.c:2293
#5 0xffffffff8b3f7003 in schedule_hrtimeout_range
(expires=expires@entry=0xffff9df22fea7cb0,
delta=delta@entry=99999999, mode=mode@entry=HRTIMER_MODE_ABS) at
kernel/time/hrtimer.c:2340
#6 0xffffffff8aae301c in ep_poll (ep=0xffff8f5790d15d40,
events=events@entry=0x7ffea91b6b90, maxevents=maxevents@entry=100,
timeout=timeout@entry=0xffff9df22fea7d58) at fs/eventpoll.c:2062
#7 0xffffffff8aae3138 in do_epoll_wait (epfd=epfd@entry=8,
events=events@entry=0x7ffea91b6b90, maxevents=maxevents@entry=100,
to=0xffff9df22fea7d58) at fs/eventpoll.c:2464
#8 0xffffffff8aae44a1 in __do_sys_epoll_wait (epfd=<optimized out>,
events=0x7ffea91b6b90, maxevents=<optimized out>, timeout=<optimized out>)
at fs/eventpoll.c:2476
#9 __se_sys_epoll_wait (epfd=<optimized out>, events=<optimized out>,
maxevents=<optimized out>, timeout=<optimized out>) at fs/eventpoll.c:2471
#10 __x64_sys_epoll_wait (regs=<optimized out>) at fs/eventpoll.c:2471
#11 0xffffffff8b3e293d in do_syscall_x64 (regs=0xffff9df22fea7f48, nr=232)
at arch/x86/entry/common.c:52
#12 do_syscall_64 (regs=0xffff9df22fea7f48, nr=232) at
arch/x86/entry/common.c:83
#13 0xffffffff8b40012f in entry_SYSCALL_64 () at
arch/x86/entry/entry_64.S:121
crash>
aarch64:
crash> set 9338
PID: 9338
COMMAND: "pickup"
TASK: ffff0000c7b05400 [THREAD_INFO: ffff0000c7b05400]
CPU: 3
STATE: TASK_INTERRUPTIBLE
crash> gdb bt
#0 __switch_to (prev=<unavailable>, prev@entry=0xffff0000c7b05400,
next=next@entry=<unavailable>) at arch/arm64/kernel/process.c:555
#1 0xffffafc5b5ebd744 in context_switch (rq=0xffff00077bbd0ec0,
prev=0xffff0000c7b05400, next=<unavailable>, rf=0xffff80008ac63a60) at
kernel/sched/core.c:5208
#2 __schedule (sched_mode=sched_mode@entry=0) at kernel/sched/core.c:6549
#3 0xffffafc5b5ebdc2c in __schedule_loop (sched_mode=<optimized out>) at
kernel/sched/core.c:6626
#4 schedule () at kernel/sched/core.c:6641
#5 0xffffafc5b5ec6030 in schedule_hrtimeout_range_clock
(expires=expires@entry=0xffff80008ac63be8, delta=delta@entry=99999999,
mode=mode@entry=HRTIMER_MODE_ABS, clock_id=clock_id@entry=1) at
kernel/time/hrtimer.c:2293
#6 0xffffafc5b5ec618c in schedule_hrtimeout_range
(expires=expires@entry=0xffff80008ac63be8,
delta=delta@entry=99999999, mode=mode@entry=HRTIMER_MODE_ABS) at
kernel/time/hrtimer.c:2340
#7 0xffffafc5b545d33c in ep_poll (ep=<unavailable>,
events=events@entry=0xffffde5c3f68,
maxevents=maxevents@entry=100, timeout=timeout@entry=0xffff80008ac63ce0) at
fs/eventpoll.c:2062
#8 0xffffafc5b545d4e4 in do_epoll_wait (epfd=epfd@entry=8,
events=events@entry=0xffffde5c3f68, maxevents=maxevents@entry=100,
to=to@entry=0xffff80008ac63ce0) at fs/eventpoll.c:2464
#9 0xffffafc5b545d534 in do_epoll_pwait (epfd=epfd@entry=8,
events=events@entry=0xffffde5c3f68, maxevents=maxevents@entry=100,
to=to@entry=0xffff80008ac63ce0, sigsetsize=<optimized out>,
sigmask=<optimized out>) at fs/eventpoll.c:2498
#10 0xffffafc5b545e7c8 in do_epoll_pwait (epfd=8, events=0xffffde5c3f68,
maxevents=100, to=0xffff80008ac63ce0, sigmask=<optimized out>,
sigsetsize=<optimized out>) at fs/eventpoll.c:2495
#11 __do_sys_epoll_pwait (epfd=8, events=0xffffde5c3f68, maxevents=100,
timeout=<optimized out>, sigmask=<optimized out>, sigsetsize=<optimized
out>) at fs/eventpoll.c:2511
#12 __se_sys_epoll_pwait (epfd=8, events=281474412330856, maxevents=100,
timeout=<optimized out>, sigmask=<optimized out>, sigsetsize=<optimized
out>) at fs/eventpoll.c:2505
#13 __arm64_sys_epoll_pwait (regs=<optimized out>) at fs/eventpoll.c:2505
#14 0xffffafc5b4fa99bc in __invoke_syscall (regs=0xffff80008ac63eb0,
syscall_fn=<optimized out>) at arch/arm64/kernel/syscall.c:35
#15 invoke_syscall (regs=regs@entry=0xffff80008ac63eb0, scno=<optimized
out>, sc_nr=sc_nr@entry=463, syscall_table=<optimized out>) at
arch/arm64/kernel/syscall.c:49
#16 0xffffafc5b4fa9ac8 in el0_svc_common (sc_nr=463,
syscall_table=<optimized out>, regs=0xffff80008ac63eb0, scno=<optimized
out>) at arch/arm64/kernel/syscall.c:132
#17 do_el0_svc (regs=regs@entry=0xffff80008ac63eb0) at
arch/arm64/kernel/syscall.c:151
#18 0xffffafc5b5eb6fa4 in el0_svc (regs=0xffff80008ac63eb0) at
arch/arm64/kernel/entry-common.c:712
#19 0xffffafc5b5eb74c0 in el0t_64_sync_handler (regs=<optimized out>) at
arch/arm64/kernel/entry-common.c:730
#20 0xffffafc5b4f91634 in el0t_64_sync () at arch/arm64/kernel/entry.S:598
crash>
BTW: other changes are fine to me.
Thanks
Lianbo
On Wed, Sep 4, 2024 at 3:54 PM <devel-request(a)lists.crash-utility.osci.io>
wrote:
> Date: Wed, 4 Sep 2024 19:49:25 +1200
> From: Tao Liu <ltao(a)redhat.com>
> Subject: [Crash-utility] [PATCH v7 00/15] gdb stack unwinding support
> for crash utility
> To: devel(a)lists.crash-utility.osci.io
> Cc: Tao Liu <ltao(a)redhat.com>
> Message-ID: <20240904074940.21331-1-ltao(a)redhat.com>
> Content-Type: text/plain; charset=UTF-8
>
> This patchset is a rebase/merged version of the following 3 patchsets:
>
> 1): [PATCH v10 0/5] Improve stack unwind on ppc64 [1]
> 2): [PATCH 0/5] x86_64 gdb stack unwinding support [2]
> 3): Clean up on top of one-thread-v2 [3]
>
> A complete description of gdb stack unwinding support for crash can be
> found in [1].
>
> This patchset can be divided into the following 3 parts:
>
> 1) part1: preparations before stack unwinding support, some
> bugs/regressions found when drafting this patchset.
> 2) part2: common part for all CPU archs, mainly dealing with
> crash_target.c/gdb_interface.c files, in order to
> support different archs.
> 3) part3: arch specific, for each ppc64/x86_64/arm64/vmware
> stack unwinding support.
>
> === part 3
> arm64: Add gdb stack unwinding support
> vmware_guestdump: Various format versions support
> x86_64: Add gdb stack unwinding support
> ppc64: correct gdb passthroughs by implementing
> machdep->get_current_task_reg
>
> === part 2
> Conditionally output gdb stack unwinding stop reasons
> Stop stack unwinding at non-kernel address
> Print task pid/command instead of CPU index
> Rename get_cpu_reg to get_current_task_reg
> Let crash change gdb context
> Leave only one gdb thread for crash
> Remove 'frame' from prohibited commands list
>
> === part 1
> Fix gdb_interface: restore gdb's output streams at end of gdb_interface
> x86_64: Fix invalid input "=>" for bt command
> Fix cpumask_t recursive dependence issue
> Fix the regression of cpumask_t for xen hyper
> ===
>
> v7 -> v6:
> 1) Reorganise the patchset, re-divided them into 3 part against the
> previous 2 parts.
> 2) Re-dealed with the cpumask_t part, which solved the comment No.4
> pointed out by lianbo in [4].
> 3) Add conditional output for the failing message of gdb stack unwinding.
> see [PATCH 11/15] Conditionally output gdb stack unwinding stop reasons
> 4) Redraft the commit messages, updated some outdated info.
> 5) Merged "Let crash change gdb context" and "set_context(): check if
> context is already current" into one.
>
> [4]:
> https://www.mail-archive.com/devel@lists.crash-utility.osci.io/msg01067.html
>
> v6 -> v5:
> 1) Refactor patch 4 & 9, which changed the function signature of struct
> get_cpu_reg/get_current_task_reg, and let each patch compile with no
> error when added on.
> 2) Rebased the patchset on top of latest upstream:
> ("79b93ecb2e72ec Fix a "Bus error" issue caused by 'crash --osrelease'
> or
> crash loading")
>
> v5 -> v4:
> 1) Plenty of code refactoring based on Lianbo's comments on v4.
> 2) Removed the magic number when dealing with regs bitmap, see [6].
> 3) Rebased the patchset on top of latest upstream:
> ("1c6da3eaff8207 arm64: Fix bt command show wrong stacktrace on ramdump
> source")
>
> v4 -> v3:
> Fixed the author issue in [PATCH v3 06/16] Fix gdb_interface: restore gdb's
> output streams at end of gdb_interface.
>
> v3 -> v2:
> 1) Updated CC list as pointed out in [4]
> 2) Compiling issues as in [5]
>
> v2 -> v1:
> 1) Added the patch: x86_64: Fix invalid input "=>" for bt command,
> thanks for Kazu's testing.
> 2) Modify the patch: x86_64: Add gdb stack unwinding support, added the
> pcp_save, spp_save and sp, for restoring the value in match of the
> original
> code logic.
>
> [1]:
> https://www.mail-archive.com/devel@lists.crash-utility.osci.io/msg00469.html
> [2]:
> https://www.mail-archive.com/devel@lists.crash-utility.osci.io/msg00488.html
> [3]:
> https://www.mail-archive.com/devel@lists.crash-utility.osci.io/msg00554.html
> [4]:
> https://www.mail-archive.com/devel@lists.crash-utility.osci.io/msg00681.html
> [5]:
> https://www.mail-archive.com/devel@lists.crash-utility.osci.io/msg00715.html
> [6]:
> https://www.mail-archive.com/devel@lists.crash-utility.osci.io/msg00819.html
>
> Aditya Gupta (3):
> Fix gdb_interface: restore gdb's output streams at end of
> gdb_interface
> Remove 'frame' from prohibited commands list
> ppc64: correct gdb passthroughs by implementing
> machdep->get_current_task_reg
>
> Alexey Makhalov (1):
> vmware_guestdump: Various format versions support
>
> Tao Liu (11):
> Fix the regression of cpumask_t for xen hyper
> Fix cpumask_t recursive dependence issue
> x86_64: Fix invalid input "=>" for bt command
> Leave only one gdb thread for crash
> Let crash change gdb context
> Rename get_cpu_reg to get_current_task_reg
> Print task pid/command instead of CPU index
> Stop stack unwinding at non-kernel address
> Conditionally output gdb stack unwinding stop reasons
> x86_64: Add gdb stack unwinding support
> arm64: Add gdb stack unwinding support
>
> arm64.c | 120 +++++++++++++++--
> crash_target.c | 71 ++++++----
> defs.h | 194 ++++++++++++++++++++++++++-
> gdb-10.2.patch | 96 ++++++++++++++
> gdb_interface.c | 39 ++----
> kernel.c | 63 +++++++--
> ppc64.c | 174 +++++++++++++++++++++++-
> symbols.c | 15 +++
> task.c | 34 +++--
> tools.c | 16 ++-
> unwind_x86_64.h | 4 -
> vmware_guestdump.c | 321 +++++++++++++++++++++++++++++++-------------
> x86_64.c | 323 ++++++++++++++++++++++++++++++++++++++++-----
> 13 files changed, 1247 insertions(+), 223 deletions(-)
>
> --
> 2.40.1
>
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