Messages in this thread Patch in this message | | | From | Ding Tianhong <> | Subject | [PATCH] arm64: add dump_stack to show_regs | Date | Sun, 19 Mar 2017 15:15:25 +0800 |
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Recently I found that when the system trigger a soft lockup in interrupt, there is only showing the regs, but no stack trace, it is very difficult to locate the problem:
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[10072.999437] NMI watchdog: BUG: soft lockup - CPU#16 stuck for 23s! [ksoftirqd/16:88] ..... [10073.041254] CPU: 16 PID: 88 Comm: ksoftirqd/16 Tainted: G 4.x.x #1 [10073.041258] Hardware name: xxxxx, BIOS 1.17 01/04/2017 [10073.041261] task: ffff803f6cb06200 ti: ffff803f6cb50000 task.ti: ffff803f6cb50000 [10073.041274] PC is at _raw_spin_unlock_irqrestore+0x24/0x30 [10073.041280] LR is at blk_run_queue+0x3c/0x48 [10073.041282] pc : [<ffff800000a3df14>] lr : [<ffff8000004f3a7c>] pstate: 60000145 [10073.041285] sp : ffff803f6cb53b20 [10073.041286] x29: ffff803f6cb53b20 x28: 0000000000001000 [10073.041290] x27: 0000000000000000 x26: ffff800001226000 [10073.041294] x25: 0000000000000000 x24: 0000000000000140 [10073.041297] x23: ffff803f62e108c8 x22: ffff800001037000 [10073.041302] x21: ffff843f66800040 x20: 0000000000000140 [10073.041305] x19: ffff803f62e108c8 x18: 0000000000000007 [10073.041309] x17: 000000000000000e x16: 0000000000000001 [10073.041312] x15: 0000000000000019 x14: 0000000000000033 [10073.041317] x13: 000000000000004c x12: 0000000000000000 [10073.041320] x11: 0000000000001000 x10: 0000000000000010 [10073.041323] x9 : ffff8000004f3a7c x8 : ffff803f69b59120 [10073.041327] x7 : 0000000000000000 x6 : 0000000000000002 [10073.041331] x5 : 0000000000000244 x4 : 00000000000244d9 [10073.041334] x3 : ffff843f653ab918 x2 : 0000000000004074 [10073.041337] x1 : 0000000000000140 x0 : ffff803f62e10e58
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So add the general dump_stack to show_regs to support showing the stack.
Signed-off-by: Ding Tianhong <dingtianhong@huawei.com> --- arch/arm64/kernel/process.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index 043d373..60c5c26 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -212,6 +212,7 @@ void show_regs(struct pt_regs * regs) { printk("\n"); __show_regs(regs); + dump_stack(); }
static void tls_thread_flush(void) -- 1.9.0
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