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| author | Josh Poimboeuf <jpoimboe@redhat.com> | 2016-10-20 11:34:43 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-10-21 09:26:04 +0200 |
| commit | 3b3fa11bc7000bb86c9fd30703da3689a9a9758d (patch) | |
| tree | 696be10dbcc03aaa408e4c692bd40498a8cac779 /arch/x86/kernel/dumpstack.c | |
| parent | 79439d8e15b51fa359a0f5d0c8f856c1f5b4bd56 (diff) | |
| download | linux-3b3fa11bc7000bb86c9fd30703da3689a9a9758d.tar.bz2 | |
x86/dumpstack: Print any pt_regs found on the stack
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>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/5cc2c512ec82cfba00dd22467644d4ed751a48c0.1476973742.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/dumpstack.c')
| -rw-r--r-- | arch/x86/kernel/dumpstack.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c index 32511772b424..64281a1d4e48 100644 --- a/arch/x86/kernel/dumpstack.c +++ b/arch/x86/kernel/dumpstack.c @@ -82,7 +82,7 @@ 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; /* @@ -119,6 +119,15 @@ 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; @@ -146,6 +155,11 @@ 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) |