[Crash-utility] Problem in bt for ARM64
Dave Anderson
anderson at redhat.com
Tue Oct 17 19:44:36 UTC 2017
Thanks Takahiro, much appreciated. Queued for crash-7.2.1:
https://github.com/crash-utility/crash/commit/2b93c036edf2a5cc21a06a14f377cd9b365f858a
Dave
----- Original Message -----
> On Mon, Oct 16, 2017 at 03:33:45PM -0400, Dave Anderson wrote:
> >
> > Hi Takahiro,
> >
> > One question about a segment of your patch that I can't test because
> > I don't have a 4.14 dumpfile. Here in arm64_switch_stack(), you have
> > conditionalized the display of the exception frame:
> >
> > @@ -2669,7 +2753,9 @@ arm64_switch_stack(struct bt_info *bt, struct
> > arm64_stackframe *frame, FILE *ofp
> > if (frame->fp == 0)
> > return USER_MODE;
> >
> > - arm64_print_exception_frame(bt, frame->sp, KERNEL_MODE, ofp);
> > + if (!(machdep->flags & UNW_4_14))
> > + arm64_print_exception_frame(bt, frame->sp, KERNEL_MODE,
> > ofp);
> > +
> > return KERNEL_MODE;
> > }
> >
> > I don't understand -- what happens with a UNW_4_14 dumpfile?
>
> One of changes made in v4.14 around entry.S is to add a "real stackframe"
> to exception entry code. So arm64_print_exception_frame() in main loop
> of arm64_back_trace_cmd() should work alike for irq and other exceptions.
> So I would say "redundant."
>
> === for your reference, when irq takes place, ===
> before calling irq handler(gic_handle_irq), the process stack looks like:
> sp +--------+
> | saved |
> | regs |
> | ... |
> fp +- - - - +
> |prev fp |
> |prev lr |
> +--------+ <--- interrupted stackframe
> | |
> | |
>
> and after entering irq handler, the irq stack looks like:
> sp | |
> fp +--------+
> |prev fp |
> |prev lr |
> | ... |
> +--------+ <--- top of irq stack
> ===========================
>
> A bonus from v4.14 changes is that we are now able to observe a "hidden"
> stackframe under exception frame, which can only appear with "bt -o"
> if it works :)
>
> === before v4.14, no frame for sys_handle_crash ===
> crash-arm64> bt
> PID: 1189 TASK: ffff80000d1bc100 CPU: 1 COMMAND: "sh"
> #0 [ffff80000cd07a30] crash_kexec at ffff0000081423a4
> #1 [ffff80000cd07a60] die at ffff000008088850
> #2 [ffff80000cd07aa0] __do_kernel_fault at ffff000008099900
> #3 [ffff80000cd07ad0] do_page_fault at ffff0000089238e0
> #4 [ffff80000cd07b40] do_translation_fault at ffff000008923920
> #5 [ffff80000cd07b50] do_mem_abort at ffff000008081354
> #6 [ffff80000cd07d30] el1_ia at ffff000008082600
> PC: ffff000008514060 [sysrq_handle_crash+32]
> LR: ffff00000851404c [sysrq_handle_crash+12]
> SP: ffff80000cd07d30 PSTATE: 60000145
> X29: ffff80000cd07d30 X28: ffff80000d1bc100 X27: ffff000008932000
> X26: 0000000000000040 X25: 0000000000000123 X24: 0000000000000000
> X23: 0000000000000009 X22: ffff000008ede000 X21: ffff000008ede870
> X20: 0000000000000063 X19: ffff000008e51000 X18: 0000000000000010
> X17: 0000ffff98268e90 X16: ffff000008200000 X15: ffffffffffffffff
> X14: ffff000088f2cf77 X13: ffff000008f2cf85 X12: ffff000008e39e08
> X11: ffff000008536220 X10: ffff80000cd07a30 X9: 0000000000000016
> X8: 6120726567676972 X7: 54203a2071527379 X6: 000000000000011a
> X5: 0000000000000000 X4: 0000000000000000 X3: 0000000000000000
> X2: ffff80001ff60960 X1: 0000000000000000 X0: 0000000000000001
> #7 [ffff80000cd07d40] __handle_sysrq at ffff00000851467c
> #8 [ffff80000cd07d80] write_sysrq_trigger at ffff000008514c04
> #9 [ffff80000cd07da0] proc_reg_write at ffff000008266910
> #10 [ffff80000cd07dc0] __vfs_write at ffff0000081fd6c4
> #11 [ffff80000cd07e40] vfs_write at ffff0000081feab0
> #12 [ffff80000cd07e80] sys_write at ffff000008200044
> #13 [ffff80000cd07ec0] el0_svc_naked at ffff000008082f2c
> PC: 0000ffff98268e78 LR: 000000000040a074 SP: 0000ffffff8ad7f0
> X29: 0000ffffff8ae1d0 X28: 000000000047d2c0 X27: 0000000000000000
> X26: 0000000005ac2440 X25: 0000000000000000 X24: 0000000000000020
> X23: 0000000005ac55e0 X22: 0000000000000002 X21: 0000000005ac55e0
> X20: 0000000000000001 X19: 00000000004ae000 X18: 0000ffffff8ac758
> X17: 0000ffff98268e90 X16: 0000000000000000 X15: 0000000000000008
> X14: 0000ffff98218a24 X13: 0000ffffff8ad8a0 X12: 0101010101010101
> X11: 0101010101010101 X10: 0101010101010101 X9: fffffffffffffff0
> X8: 0000000000000040 X7: 0000000000000000 X6: 0080000080808080
> X5: 0000000000000000 X4: 0000000005ac0063 X3: 0000000005ac55e1
> X2: 0000000000000002 X1: 0000000005ac55e0 X0: 0000000000000001
> ORIG_X0: 0000000000000001 SYSCALLNO: 40 PSTATE: 80000000
>
> ==== v4.14 or later, see #7 ===
> crash-arm64> bt
> PID: 1326 TASK: ffff80000d260e00 CPU: 1 COMMAND: "sh"
> #0 [ffff00000b413a20] crash_kexec at ffff00000814c010
> #1 [ffff00000b413a50] die at ffff000008089088
> #2 [ffff00000b413a90] __do_kernel_fault at ffff000008097ac0
> #3 [ffff00000b413ac0] do_page_fault at ffff000008097bdc
> #4 [ffff00000b413b30] do_translation_fault at ffff000008097f60
> #5 [ffff00000b413b40] do_mem_abort at ffff0000080812ac
> #6 [ffff00000b413d20] el1_ia at ffff000008082f10
> PC: ffff000008544330 [sysrq_handle_crash+32]
> LR: ffff00000854431c [sysrq_handle_crash+12]
> SP: ffff00000b413d30 PSTATE: 60000145
> X29: ffff00000b413d30 X28: ffff80000d260e00 X27: ffff0000089c1000
> X26: 0000000000000040 X25: 0000000000000124 X24: 0000000000000000
> X23: 0000000000000009 X22: ffff000008fda000 X21: ffff000008fdaa48
> X20: 0000000000000063 X19: ffff000008f33000 X18: 0000000000000010
> X17: 0000ffffa1c93e90 X16: ffff00000820b370 X15: ffffffffffffffff
> X14: ffff00008903c37f X13: ffff00000903c38d X12: ffff000008f19df0
> X11: ffff000008566d30 X10: ffff00000b413a50 X9: 0000000000000015
> X8: 54203a2071527379 X7: 53203a7172737973 X6: 000000000000010e
> X5: 0000000000000000 X4: 0000000000000000 X3: 0000000000000000
> X2: ffff80000ef627f0 X1: 0000000000000000 X0: 0000000000000001
> #7 [ffff00000b413d30] sysrq_handle_crash at ffff00000854432c
> #8 [ffff00000b413d40] __handle_sysrq at ffff00000854494c
> #9 [ffff00000b413d80] write_sysrq_trigger at ffff000008544ed4
> #10 [ffff00000b413da0] proc_reg_write at ffff00000827273c
> #11 [ffff00000b413dc0] __vfs_write at ffff00000820ae34
> #12 [ffff00000b413e40] vfs_write at ffff00000820b108
> #13 [ffff00000b413e80] sys_write at ffff00000820b3b4
> #14 [ffff00000b413ff0] el0_svc_naked at ffff0000080837ac
> PC: 0000ffffa1c93e78 LR: 000000000040a074 SP: 0000ffffd2703e60
> X29: 0000ffffd2704840 X28: 000000000047d2c0 X27: 0000000000000000
> X26: 000000003c71a440 X25: 0000000000000000 X24: 0000000000000020
> X23: 000000003c71cf90 X22: 0000000000000002 X21: 000000003c71cf90
> X20: 0000000000000001 X19: 00000000004ae000 X18: 0000ffffd2702dc8
> X17: 0000ffffa1c93e90 X16: 0000000000000000 X15: 0000000000000008
> X14: 0000ffffa1c43a24 X13: 0000ffffd2703f10 X12: 0101010101010101
> X11: 0101010101010101 X10: 0101010101010101 X9: fffffffffffffff0
> X8: 0000000000000040 X7: 0000000000000000 X6: 0080808080808080
> X5: 0000000000000000 X4: 0000000000000063 X3: 000000003c71cf91
> X2: 0000000000000002 X1: 000000003c71cf90 X0: 0000000000000001
> ORIG_X0: 0000000000000001 SYSCALLNO: 40 PSTATE: 80000000
> ===========================
>
> So I'm thinking of disabling "bt -o" for v4.14 or later since "bt -o"
> may partly lose its "reason d'etre."
>
> -Takahiro AKASHI
>
> > Thanks,
> > Dave
> >
> >
> >
> >
> > ----- Original Message -----
> > >
> > > Hi Takahiro,
> > >
> > > Welcome back! It's great to get you back in the fold again...
> > >
> > > I just ran a quick test of your patch on a set of sample dumpfiles,
> > > and only found one issue. It was on a 4.2 QEMU dump where all of the
> > > active tasks were running in user-space, and all of their "bt" commands
> > > fail immediately with a "zero-size" allocation message. As it turns out,
> > > that was due to this GETBUF() call in arm64_in_kdump_text_on_irq_stack():
> > >
> > > static int
> > > arm64_in_kdump_text_on_irq_stack(struct bt_info *bt)
> > > {
> > > int cpu;
> > > ulong stackbase;
> > > char *stackbuf;
> > > ulong *ptr, *start, *base;
> > > struct machine_specific *ms;
> > >
> > > if ((machdep->flags & (IRQ_STACKS|KDUMP_ENABLED)) !=
> > > (IRQ_STACKS|KDUMP_ENABLED))
> > > return FALSE;
> > >
> > > ms = machdep->machspec;
> > > cpu = bt->tc->processor;
> > > stackbase = ms->irq_stacks[cpu];
> > > stackbuf = GETBUF(ms->irq_stack_size); <===
> > > ...
> > >
> > > ms->irq_stack_size is zero because that kernel version does not have IRQ
> > > stacks.
> > > As it turns out, the problem is that your reworked arm64_irq_stack_init()
> > > is
> > > setting
> > > the IRQ_STACKS flag unconditionally at the bottom of the function.
> > > Moving
> > > the
> > > flag setting up into the two if-else segments fixes it.
> > >
> > > I'll check out the patches in detail next week, but this looks good.
> > >
> > > Thanks,
> > > Dave
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > ----- Original Message -----
> > > > Dave,
> > > >
> > > > On Fri, Sep 22, 2017 at 03:06:00PM -0400, Dave Anderson wrote:
> > > > >
> > > > > Jan,
> > > > >
> > > > > I went back to creating a machdep->machspec->user_eframe_offset value
> > > > > to be able to account for both the 4.7 and the upcoming 4.14 pt_regs
> > > > > changes:
> > > > >
> > > > > https://github.com/crash-utility/crash/commit/c975008e61121ef8785622c3bc26964da8fe0deb
> > > > >
> > > > > Again, though, note that "bt" does not work with 4.14.
> > > >
> > > > Even with your latest changes in 7.2.0, "bt" still has some issues:
> > > > a.register dump at exception frame doesn't have correct values
> > > > (due to added stackframe[] in pt_regs)
> > > > b. tracing irq stack to process stack fails
> > > > (due to irq-stack implementation changes and VMAP_STACK)
> > > > c."bt -o" seems to have been broken for a while
> > > >
> > > > Attached is my tentative patch, which hopefully addresses (a) and (b).
> > > > While it is still far from perfect, it may help give you a heads-up.
> > > >
> > > > Thanks,
> > > > -Takahiro AKASHI
> > > >
> > > > ===8<===
> > > > >From 156ec115b2a436a0738908153d676f8eeed84cb1 Mon Sep 17 00:00:00 2001
> > > > From: AKASHI Takahiro <takahiro.akashi at linaro.org>
> > > > Date: Thu, 12 Oct 2017 10:46:34 +0900
> > > > Subject: [PATCH] arm64: backtrace for v4.14
> > > >
> > > > ---
> > > > arm64.c | 172
> > > > ++++++++++++++++++++++++++++++++++++++++++++++++++--------------
> > > > 1 file changed, 136 insertions(+), 36 deletions(-)
> > > >
> > > > diff --git a/arm64.c b/arm64.c
> > > > index 20c5d34..22c8556 100644
> > > > --- a/arm64.c
> > > > +++ b/arm64.c
> > > > @@ -72,6 +72,7 @@ static void arm64_cmd_mach(void);
> > > > static void arm64_display_machine_stats(void);
> > > > static int arm64_get_smp_cpus(void);
> > > > static void arm64_clear_machdep_cache(void);
> > > > +static int arm64_on_process_stack(struct bt_info *, ulong);
> > > > static int arm64_in_alternate_stack(int, ulong);
> > > > static int arm64_on_irq_stack(int, ulong);
> > > > static void arm64_set_irq_stack(struct bt_info *);
> > > > @@ -1336,29 +1337,60 @@ arm64_irq_stack_init(void)
> > > > req = &request;
> > > > struct machine_specific *ms = machdep->machspec;
> > > >
> > > > - if (!symbol_exists("irq_stack") ||
> > > > - !(sp = per_cpu_symbol_search("irq_stack")) ||
> > > > - !get_symbol_type("irq_stack", NULL, req) ||
> > > > - (req->typecode != TYPE_CODE_ARRAY) ||
> > > > - (req->target_typecode != TYPE_CODE_INT))
> > > > - return;
> > > > + if (!(ms->irq_stacks = (ulong *)malloc((size_t)(kt->cpus
> > > > + * sizeof(ulong)))))
> > > > + error(FATAL, "cannot malloc irq_stack addresses\n");
> > > >
> > > > - if (CRASHDEBUG(1)) {
> > > > - fprintf(fp, "irq_stack: \n");
> > > > - fprintf(fp, " type: %s\n",
> > > > - (req->typecode == TYPE_CODE_ARRAY) ? "TYPE_CODE_ARRAY" : "other");
> > > > - fprintf(fp, " target_typecode: %s\n",
> > > > - req->target_typecode == TYPE_CODE_INT ? "TYPE_CODE_INT" : "other");
> > > > - fprintf(fp, " target_length: %ld\n", req->target_length);
> > > > - fprintf(fp, " length: %ld\n", req->length);
> > > > - }
> > > > + if (symbol_exists("irq_stack") &&
> > > > + (sp = per_cpu_symbol_search("irq_stack")) &&
> > > > + get_symbol_type("irq_stack", NULL, req)) {
> > > > + /* before v4.14 or CONFIG_VMAP_STACK disabled */
> > > > + if (CRASHDEBUG(1)) {
> > > > + fprintf(fp, "irq_stack: \n");
> > > > + fprintf(fp, " type: %s\n",
> > > > + (req->typecode == TYPE_CODE_ARRAY) ?
> > > > + "TYPE_CODE_ARRAY" : "other");
> > > > + fprintf(fp, " target_typecode: %s\n",
> > > > + req->target_typecode == TYPE_CODE_INT ?
> > > > + "TYPE_CODE_INT" : "other");
> > > > + fprintf(fp, " target_length: %ld\n",
> > > > + req->target_length);
> > > > + fprintf(fp, " length: %ld\n", req->length);
> > > > + }
> > > >
> > > > - ms->irq_stack_size = req->length;
> > > > - if (!(ms->irq_stacks = (ulong *)malloc((size_t)(kt->cpus *
> > > > sizeof(ulong)))))
> > > > - error(FATAL, "cannot malloc irq_stack addresses\n");
> > > > + ms->irq_stack_size = req->length;
> > > > +
> > > > + for (i = 0; i < kt->cpus; i++)
> > > > + ms->irq_stacks[i] = kt->__per_cpu_offset[i] + sp->value;
> > > > + } else if (symbol_exists("irq_stack_ptr") &&
> > > > + (sp = per_cpu_symbol_search("irq_stack_ptr")) &&
> > > > + get_symbol_type("irq_stack_ptr", NULL, req)) {
> > > > + /* v4.14 and later with CONFIG_VMAP_STACK enabled */
> > > > + if (CRASHDEBUG(1)) {
> > > > + fprintf(fp, "irq_stack_ptr: \n");
> > > > + fprintf(fp, " type: %x, %s\n",
> > > > + (int)req->typecode,
> > > > + (req->typecode == TYPE_CODE_PTR) ?
> > > > + "TYPE_CODE_PTR" : "other");
> > > > + fprintf(fp, " target_typecode: %x, %s\n",
> > > > + (int)req->target_typecode,
> > > > + req->target_typecode == TYPE_CODE_INT ?
> > > > + "TYPE_CODE_INT" : "other");
> > > > + fprintf(fp, " target_length: %ld\n",
> > > > + req->target_length);
> > > > + fprintf(fp, " length: %ld\n", req->length);
> > > > + }
> > > > +
> > > > + ms->irq_stack_size = 16384;
> > > > +
> > > > + for (i = 0; i < kt->cpus; i++) {
> > > > + ulong p;
> > > >
> > > > - for (i = 0; i < kt->cpus; i++)
> > > > - ms->irq_stacks[i] = kt->__per_cpu_offset[i] + sp->value;
> > > > + p = kt->__per_cpu_offset[i] + sp->value;
> > > > + readmem(p, KVADDR, &(ms->irq_stacks[i]), sizeof(ulong),
> > > > + "IRQ stack pointer", RETURN_ON_ERROR);
> > > > + }
> > > > + }
> > > >
> > > > machdep->flags |= IRQ_STACKS;
> > > > }
> > > > @@ -1750,11 +1782,20 @@ arm64_display_full_frame(struct bt_info *bt,
> > > > ulong
> > > > sp)
> > > > if (bt->frameptr == sp)
> > > > return;
> > > >
> > > > - if (!INSTACK(sp, bt) || !INSTACK(bt->frameptr, bt)) {
> > > > - if (sp == 0)
> > > > - sp = bt->stacktop - USER_EFRAME_OFFSET;
> > > > - else
> > > > - return;
> > > > + if (INSTACK(bt->frameptr, bt)) {
> > > > + if (INSTACK(sp, bt)) {
> > > > + /* normal case */;
> > > > + } else {
> > > > + if (sp == 0)
> > > > + /* interrupt in user mode */
> > > > + sp = bt->stacktop - USER_EFRAME_OFFSET;
> > > > + else
> > > > + /* interrupt in kernel mode */
> > > > + sp = bt->stacktop;
> > > > + }
> > > > + } else {
> > > > + error(WARNING, "full display ?\n");
> > > > + return;
> > > > }
> > > >
> > > > words = (sp - bt->frameptr) / sizeof(ulong);
> > > > @@ -1873,6 +1914,25 @@ arm64_unwind_frame(struct bt_info *bt, struct
> > > > arm64_stackframe *frame)
> > > > * orig_sp = IRQ_STACK_TO_TASK_STACK(irq_stack_ptr); (pt_regs
> > > > pointer
> > > > on
> > > > process stack)
> > > > */
> > > > if (machdep->flags & IRQ_STACKS) {
> > > > + if (machdep->flags & UNW_4_14) {
> > > > + if ((bt->flags & BT_IRQSTACK) &&
> > > > + !arm64_on_irq_stack(bt->tc->processor, frame->fp)) {
> > > > + if (arm64_on_process_stack(bt, frame->fp)) {
> > > > + arm64_set_process_stack(bt);
> > > > +
> > > > + frame->sp = frame->fp - SIZE(pt_regs) + 16;
> > > > + /* for switch_stack */
> > > > + /* fp still points to irq stack */
> > > > + bt->bptr = fp;
> > > > + /* for display_full_frame */
> > > > + /* sp points to process stack */
> > > > + bt->frameptr = frame->sp;
> > > > + } else {
> > > > + /* irq -> user */
> > > > + return FALSE;
> > > > + }
> > > > + }
> > > > + } else { /* !UNW_4_14 */
> > > > ms = machdep->machspec;
> > > > irq_stack_ptr = ms->irq_stacks[bt->tc->processor] +
> > > > ms->irq_stack_size -
> > > > 16;
> > > >
> > > > @@ -1896,6 +1956,7 @@ arm64_unwind_frame(struct bt_info *bt, struct
> > > > arm64_stackframe *frame)
> > > > return FALSE;
> > > > }
> > > > }
> > > > + } /* UNW_4_14 */
> > > > }
> > > >
> > > > return TRUE;
> > > > @@ -2086,10 +2147,17 @@ arm64_unwind_frame_v2(struct bt_info *bt,
> > > > struct
> > > > arm64_stackframe *frame,
> > > > * We are on process stack. Just add a faked frame
> > > > */
> > > >
> > > > - if (!arm64_on_irq_stack(bt->tc->processor, ext_frame.fp))
> > > > - frame->sp = ext_frame.fp
> > > > - - sizeof(struct arm64_pt_regs);
> > > > - else {
> > > > + if (!arm64_on_irq_stack(bt->tc->processor, ext_frame.fp)) {
> > > > + if (MEMBER_EXISTS("pt_regs", "stackframe")) {
> > > > + frame->sp = ext_frame.fp
> > > > + - sizeof(struct arm64_pt_regs) - 16;
> > > > + frame->fp = ext_frame.fp;
> > > > + } else {
> > > > + frame->sp = ext_frame.fp
> > > > + - sizeof(struct arm64_pt_regs);
> > > > + frame->fp = frame->sp;
> > > > + }
> > > > + } else {
> > > > /*
> > > > * FIXME: very exceptional case
> > > > * We are already back on process stack, but
> > > > @@ -2109,10 +2177,10 @@ arm64_unwind_frame_v2(struct bt_info *bt,
> > > > struct
> > > > arm64_stackframe *frame,
> > > > * Really ugly
> > > > */
> > > > frame->sp = frame->fp + 0x20;
> > > > + frame->fp = frame->sp;
> > > > fprintf(ofp, " (Next exception frame might be wrong)\n");
> > > > }
> > > >
> > > > - frame->fp = frame->sp;
> > > > } else {
> > > > /* We are on IRQ stack */
> > > >
> > > > @@ -2122,9 +2190,15 @@ arm64_unwind_frame_v2(struct bt_info *bt, struct
> > > > arm64_stackframe *frame,
> > > > if (ext_frame.fp != irq_stack_ptr) {
> > > > /* (2) Just add a faked frame */
> > > >
> > > > - frame->sp = ext_frame.fp
> > > > - - sizeof(struct arm64_pt_regs);
> > > > - frame->fp = frame->sp;
> > > > + if (MEMBER_EXISTS("pt_regs", "stackframe")) {
> > > > + frame->sp = ext_frame.fp
> > > > + - sizeof(struct arm64_pt_regs);
> > > > + frame->fp = ext_frame.fp;
> > > > + } else {
> > > > + frame->sp = ext_frame.fp
> > > > + - sizeof(struct arm64_pt_regs) - 16;
> > > > + frame->fp = frame->sp;
> > > > + }
> > > > } else {
> > > > /*
> > > > * (3)
> > > > @@ -2304,11 +2378,19 @@ arm64_back_trace_cmd(struct bt_info *bt)
> > > > if (arm64_in_exception_text(bt->instptr) && INSTACK(stackframe.fp,
> > > > bt))
> > > > {
> > > > if (!(bt->flags & BT_IRQSTACK) ||
> > > > (((stackframe.sp + SIZE(pt_regs)) < bt->stacktop)))
> > > > - exception_frame = stackframe.fp - SIZE(pt_regs);
> > > > + {
> > > > + if (MEMBER_EXISTS("pt_regs", "stackframe"))
> > > > + /* v4.14 or later */
> > > > + exception_frame = stackframe.fp
> > > > + - SIZE(pt_regs) + 16;
> > > > + else
> > > > + exception_frame = stackframe.fp
> > > > + - SIZE(pt_regs);
> > > > + }
> > > > }
> > > >
> > > > if ((bt->flags & BT_IRQSTACK) &&
> > > > - !arm64_on_irq_stack(bt->tc->processor, stackframe.sp)) {
> > > > + !arm64_on_irq_stack(bt->tc->processor, stackframe.fp)) {
> > > > bt->flags &= ~BT_IRQSTACK;
> > > > if (arm64_switch_stack(bt, &stackframe, ofp) == USER_MODE)
> > > > break;
> > > > @@ -2424,6 +2506,8 @@ user_space:
> > > > * otherwise show an exception frame.
> > > > * Since exception entry code doesn't have a real
> > > > * stackframe, we fake a dummy frame here.
> > > > + * Note: Since we have a real stack frame in pt_regs,
> > > > + * We no longer need a dummy frame on v4.14 or later.
> > > > */
> > > > if (!arm64_in_exp_entry(stackframe.pc))
> > > > continue;
> > > > @@ -2669,7 +2753,9 @@ arm64_switch_stack(struct bt_info *bt, struct
> > > > arm64_stackframe *frame, FILE *ofp
> > > > if (frame->fp == 0)
> > > > return USER_MODE;
> > > >
> > > > - arm64_print_exception_frame(bt, frame->sp, KERNEL_MODE, ofp);
> > > > + if (!(machdep->flags & UNW_4_14))
> > > > + arm64_print_exception_frame(bt, frame->sp, KERNEL_MODE, ofp);
> > > > +
> > > > return KERNEL_MODE;
> > > > }
> > > >
> > > > @@ -3362,6 +3448,20 @@ arm64_clear_machdep_cache(void) {
> > > > return;
> > > > }
> > > >
> > > > +static int
> > > > +arm64_on_process_stack(struct bt_info *bt, ulong stkptr)
> > > > +{
> > > > + ulong stackbase, stacktop;
> > > > +
> > > > + stackbase = GET_STACKBASE(bt->task);
> > > > + stacktop = GET_STACKTOP(bt->task);
> > > > +
> > > > + if ((stkptr >= stackbase) && (stkptr < stacktop))
> > > > + return TRUE;
> > > > +
> > > > + return FALSE;
> > > > +}
> > > > +
> > > > static int
> > > > arm64_on_irq_stack(int cpu, ulong stkptr)
> > > > {
> > > > --
> > > > 2.14.1
> > > >
> > > > --
> > > > Crash-utility mailing list
> > > > Crash-utility at redhat.com
> > > > https://www.redhat.com/mailman/listinfo/crash-utility
> > > >
> > >
> >
> > --
> > Crash-utility mailing list
> > Crash-utility at redhat.com
> > https://www.redhat.com/mailman/listinfo/crash-utility
>
> --
> Crash-utility mailing list
> Crash-utility at redhat.com
> https://www.redhat.com/mailman/listinfo/crash-utility
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