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Groups > linux.kernel > #1461233
| From | Josh Poimboeuf <jpoimboe@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v3 44/51] x86/dumpstack: print any pt_regs found on the stack |
| Date | 2016-08-12 16:40 +0200 |
| Message-ID | <s5lMT-2Ra-69@gated-at.bofh.it> (permalink) |
| References | <s5lMR-2Ra-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Now that we can find pt_regs registers on the stack, print them. Here's
an example of what it looks like:
Call Trace:
<IRQ>
[<ffffffff8144b793>] dump_stack+0x86/0xc3
[<ffffffff81142c73>] hrtimer_interrupt+0xb3/0x1c0
[<ffffffff8105eb86>] local_apic_timer_interrupt+0x36/0x60
[<ffffffff818b27cd>] smp_apic_timer_interrupt+0x3d/0x50
[<ffffffff818b06ee>] apic_timer_interrupt+0x9e/0xb0
RIP: 0010:[<ffffffff818aef43>] [<ffffffff818aef43>] _raw_spin_unlock_irq+0x33/0x60
RSP: 0018:ffff880079c4f760 EFLAGS: 00000202
RAX: ffff880078738000 RBX: ffff88007d3da0c0 RCX: 0000000000000007
RDX: 0000000000006d78 RSI: ffff8800787388f0 RDI: ffff880078738000
RBP: ffff880079c4f768 R08: 0000002199088f38 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81e0d540
R13: ffff8800369fb700 R14: 0000000000000000 R15: ffff880078738000
<EOI>
[<ffffffff810e1f14>] finish_task_switch+0xb4/0x250
[<ffffffff810e1ed6>] ? finish_task_switch+0x76/0x250
[<ffffffff818a7b61>] __schedule+0x3e1/0xb20
...
[<ffffffff810759c8>] trace_do_page_fault+0x58/0x2c0
[<ffffffff8106f7dc>] do_async_page_fault+0x2c/0xa0
[<ffffffff818b1dd8>] async_page_fault+0x28/0x30
RIP: 0010:[<ffffffff8145b062>] [<ffffffff8145b062>] __clear_user+0x42/0x70
RSP: 0018:ffff880079c4fd38 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000138 RCX: 0000000000000138
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 000000000061b640
RBP: ffff880079c4fd48 R08: 0000002198feefd7 R09: ffffffff82a40928
R10: 0000000000000001 R11: 0000000000000000 R12: 000000000061b640
R13: 0000000000000000 R14: ffff880079c50000 R15: ffff8800791d7400
[<ffffffff8145b043>] ? __clear_user+0x23/0x70
[<ffffffff8145b0fb>] clear_user+0x2b/0x40
[<ffffffff812fbda2>] load_elf_binary+0x1472/0x1750
[<ffffffff8129a591>] search_binary_handler+0xa1/0x200
[<ffffffff8129b69b>] do_execveat_common.isra.36+0x6cb/0x9f0
[<ffffffff8129b5f3>] ? do_execveat_common.isra.36+0x623/0x9f0
[<ffffffff8129bcaa>] SyS_execve+0x3a/0x50
[<ffffffff81003f5c>] do_syscall_64+0x6c/0x1e0
[<ffffffff818afa3f>] entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:[<00007fd2e2f2e537>] [<00007fd2e2f2e537>] 0x7fd2e2f2e537
RSP: 002b:00007ffc449c5fc8 EFLAGS: 00000246
RAX: ffffffffffffffda RBX: 00007ffc449c8860 RCX: 00007fd2e2f2e537
RDX: 000000000127cc40 RSI: 00007ffc449c8860 RDI: 00007ffc449c6029
RBP: 00007ffc449c60b0 R08: 65726f632d667265 R09: 00007ffc449c5e20
R10: 00000000000005a7 R11: 0000000000000246 R12: 000000000127cc40
R13: 000000000127ce05 R14: 00007ffc449c6029 R15: 000000000127ce01
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
---
arch/x86/kernel/dumpstack.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 92a2f82..cae70c1 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -86,7 +86,7 @@ void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
* - softirq stack
* - hardirq stack
*/
- for (; stack; stack = stack_info.next_sp) {
+ for (regs = NULL; stack; stack = stack_info.next_sp) {
const char *str_begin, *str_end;
/*
@@ -123,6 +123,15 @@ void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
if (!__kernel_text_address(addr))
continue;
+ /*
+ * Don't print regs->ip again if it was already printed
+ * by __show_regs() below.
+ */
+ if (regs && stack == ®s->ip) {
+ unwind_next_frame(&state);
+ continue;
+ }
+
if (stack == ret_addr_p)
reliable = 1;
@@ -150,6 +159,11 @@ void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
* of the addresses will just be printed as unreliable.
*/
unwind_next_frame(&state);
+
+ /* if the frame has entry regs, print them */
+ regs = unwind_get_entry_regs(&state);
+ if (regs)
+ __show_regs(regs, 0);
}
if (str_end)
--
2.7.4
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[PATCH v3 00/51] x86/dumpstack: rewrite x86 stack dump code Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
[PATCH v3 49/51] x86/dumpstack: warn on stack recursion Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
[PATCH v3 36/51] perf/x86: convert perf_callchain_kernel() to use the new unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
[PATCH v3 26/51] ftrace: add ftrace_graph_ret_addr() stack unwinding helpers Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
[PATCH v3 33/51] x86/dumpstack: add get_stack_info() interface Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
[PATCH v3 48/51] x86/unwind: warn if stack grows up Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
Re: [PATCH v3 48/51] x86/unwind: warn if stack grows up Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:30 +0200
Re: [PATCH v3 48/51] x86/unwind: warn if stack grows up Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 18:30 +0200
[PATCH v3 50/51] x86/mm: move arch_within_stack_frames() to usercopy.c Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
Re: [PATCH v3 50/51] x86/mm: move arch_within_stack_frames() to usercopy.c Kees Cook <keescook@chromium.org> - 2016-08-12 19:40 +0200
Re: [PATCH v3 50/51] x86/mm: move arch_within_stack_frames() to usercopy.c Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 21:20 +0200
Re: [PATCH v3 50/51] x86/mm: move arch_within_stack_frames() to usercopy.c Kees Cook <keescook@chromium.org> - 2016-08-12 22:10 +0200
Re: [PATCH v3 50/51] x86/mm: move arch_within_stack_frames() to usercopy.c Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 22:40 +0200
Re: [PATCH v3 50/51] x86/mm: move arch_within_stack_frames() to usercopy.c Kees Cook <keescook@chromium.org> - 2016-08-12 22:50 +0200
[PATCH v3 44/51] x86/dumpstack: print any pt_regs found on the stack Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
Re: [PATCH v3 44/51] x86/dumpstack: print any pt_regs found on the stack Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:50 +0200
[PATCH v3 12/51] x86: move _stext marker to before head code Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
[PATCH v3 32/51] x86/dumpstack: simplify in_exception_stack() Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
Re: [PATCH v3 32/51] x86/dumpstack: simplify in_exception_stack() Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:50 +0200
Re: [PATCH v3 32/51] x86/dumpstack: simplify in_exception_stack() Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 17:40 +0200
[PATCH v3 14/51] x86/asm/head: put real return address on idle task stack Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
Re: [PATCH v3 14/51] x86/asm/head: put real return address on idle task stack Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:40 +0200
Re: [PATCH v3 14/51] x86/asm/head: put real return address on idle task stack Nilay Vaish <nilayvaish@gmail.com> - 2016-08-17 22:40 +0200
Re: [PATCH v3 14/51] x86/asm/head: put real return address on idle task stack Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-17 23:20 +0200
[PATCH v3 16/51] x86/32: put real return address on stack in entry code Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
Re: [PATCH v3 16/51] x86/32: put real return address on stack in entry code Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:30 +0200
Re: [PATCH v3 16/51] x86/32: put real return address on stack in entry code Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 17:10 +0200
Re: [PATCH v3 16/51] x86/32: put real return address on stack in entry code "H. Peter Anvin" <hpa@zytor.com> - 2016-08-15 20:10 +0200
Re: [PATCH v3 16/51] x86/32: put real return address on stack in entry code Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 20:30 +0200
Re: [PATCH v3 16/51] x86/32: put real return address on stack in entry code "H. Peter Anvin" <hpa@zytor.com> - 2016-08-15 21:30 +0200
Re: [PATCH v3 16/51] x86/32: put real return address on stack in entry code Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 22:10 +0200
[PATCH v3 18/51] x86/entry/head/32: use local labels Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
[PATCH v3 30/51] x86/dumpstack/ftrace: don't print unreliable addresses in print_context_stack_bp() Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
[PATCH v3 42/51] x86/unwind: create stack frames for saved syscall registers Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
Re: [PATCH v3 42/51] x86/unwind: create stack frames for saved syscall registers Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:40 +0200
Re: [PATCH v3 42/51] x86/unwind: create stack frames for saved syscall registers Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 19:00 +0200
[PATCH v3 28/51] ftrace/x86: implement HAVE_FUNCTION_GRAPH_RET_ADDR_PTR Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
[PATCH v3 31/51] x86/dumpstack: allow preemption in show_stack_log_lvl() and dump_trace() Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
Re: [PATCH v3 31/51] x86/dumpstack: allow preemption in show_stack_log_lvl() and dump_trace() Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:50 +0200
Re: [PATCH v3 31/51] x86/dumpstack: allow preemption in show_stack_log_lvl() and dump_trace() Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 17:40 +0200
[PATCH v3 41/51] x86/entry/unwind: create stack frames for saved interrupt registers Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
Re: [PATCH v3 41/51] x86/entry/unwind: create stack frames for saved interrupt registers Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:40 +0200
Re: [PATCH v3 41/51] x86/entry/unwind: create stack frames for saved interrupt registers Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 18:40 +0200
[PATCH v3 37/51] x86/stacktrace: convert save_stack_trace_*() to use the new unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
[PATCH v3 05/51] x86/dumpstack: make printk_stack_address() more generally useful Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
[PATCH v3 43/51] x86/dumpstack: print stack identifier on its own line Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
[PATCH v3 24/51] ftrace: only allocate the ret_stack 'fp' field when needed Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
[PATCH v3 29/51] x86/dumpstack/ftrace: mark function graph handler function as unreliable Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:40 +0200
[PATCH v3 03/51] x86/asm/head: rename 'stack_start' -> 'initial_stack' Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
[PATCH v3 09/51] x86/dumpstack: fix x86_32 kernel_stack_pointer() previous stack access Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
Re: [PATCH v3 09/51] x86/dumpstack: fix x86_32 kernel_stack_pointer() previous stack access Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:30 +0200
Re: [PATCH v3 09/51] x86/dumpstack: fix x86_32 kernel_stack_pointer() previous stack access Brian Gerst <brgerst@gmail.com> - 2016-08-14 15:00 +0200
Re: [PATCH v3 09/51] x86/dumpstack: fix x86_32 kernel_stack_pointer() previous stack access Andy Lutomirski <luto@amacapital.net> - 2016-08-14 15:50 +0200
Re: [PATCH v3 09/51] x86/dumpstack: fix x86_32 kernel_stack_pointer() previous stack access Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 17:10 +0200
Re: [PATCH v3 09/51] x86/dumpstack: fix x86_32 kernel_stack_pointer() previous stack access Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 19:30 +0200
Re: [PATCH v3 09/51] x86/dumpstack: fix x86_32 kernel_stack_pointer() previous stack access Andy Lutomirski <luto@amacapital.net> - 2016-08-15 22:10 +0200
[PATCH v3 13/51] x86/asm/head: remove useless zeroed word Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
[PATCH v3 21/51] oprofile/x86: add regs->ip to oprofile trace Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
[PATCH v3 10/51] x86/dumpstack: add get_stack_pointer() and get_frame_pointer() Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
[PATCH v3 07/51] x86/dumpstack: remove extra brackets around "<EOE>" Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
[PATCH v3 17/51] x86/smp: fix initial idle stack location on 32-bit Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
[PATCH v3 08/51] x86/dumpstack: fix irq stack bounds calculation in show_stack_log_lvl() Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
[PATCH v3 15/51] x86/asm/head: standardize the end of the stack for idle tasks Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
Re: [PATCH v3 15/51] x86/asm/head: standardize the end of the stack for idle tasks Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:40 +0200
[PATCH v3 19/51] x86/entry/32: rename 'error_code' to 'common_exception' Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
Re: [PATCH v3 19/51] x86/entry/32: rename 'error_code' to 'common_exception' Andy Lutomirski <luto@amacapital.net> - 2016-08-14 10:50 +0200
Re: [PATCH v3 19/51] x86/entry/32: rename 'error_code' to 'common_exception' Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-15 17:40 +0200
[PATCH v3 23/51] ftrace: remove CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST from config Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 16:50 +0200
[PATCH v3 11/51] x86/dumpstack: remove unnecessary stack pointer arguments Josh Poimboeuf <jpoimboe@redhat.com> - 2016-08-12 17:10 +0200
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