Messages in this thread Patch in this message | | | From | Josh Poimboeuf <> | Subject | [PATCH 19/19] x86/dumpstack: print any pt_regs found on the stack | Date | Thu, 21 Jul 2016 16:21:56 -0500 |
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Now that we can find pt_regs registers in the middle of the stack due to an interrupt or exception, we can print them. Here's what it looks like:
... [<ffffffff8106f7dc>] do_async_page_fault+0x2c/0xa0 [<ffffffff8189f558>] async_page_fault+0x28/0x30 RIP: 0010:[<ffffffff814529e2>] [<ffffffff814529e2>] __clear_user+0x42/0x70 RSP: 0018:ffff88007876fd38 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000000000000138 RCX: 0000000000000138 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 000000000061b640 RBP: ffff88007876fd48 R08: 0000000dc2ced0d0 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 000000000061b640 R13: 0000000000000000 R14: ffff880078770000 R15: ffff880079947200 [<ffffffff814529e2>] ? __clear_user+0x42/0x70 [<ffffffff814529c3>] ? __clear_user+0x23/0x70 [<ffffffff81452a7b>] clear_user+0x2b/0x40 ...
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> --- arch/x86/kernel/dumpstack.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c index 0eedb01..4509866 100644 --- a/arch/x86/kernel/dumpstack.c +++ b/arch/x86/kernel/dumpstack.c @@ -173,6 +173,14 @@ void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, * printed as unreliable. */ unwind_next_frame(&state); + + /* + * If the previous frame had pt_regs associated with it + * due to an interrupt or exception, print them. + */ + regs = unwind_get_entry_regs(&state); + if (regs) + __show_regs(regs, 0); } if (str_end) -- 2.7.4
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