]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
x86: Fetch stack from regs when possible in dump_trace()
authorFrederic Weisbecker <fweisbec@gmail.com>
Thu, 30 Jun 2011 17:04:56 +0000 (19:04 +0200)
committerFrederic Weisbecker <fweisbec@gmail.com>
Sat, 2 Jul 2011 16:04:20 +0000 (18:04 +0200)
commit47ce11a2b6519f9c7843223ea8e561eb71ea5896
treef2b4130ac79a558b687ba22103878db10dbadb1e
parent9e46294dadedc0c04adcb8ce760bd2cd74f7332d
x86: Fetch stack from regs when possible in dump_trace()

When regs are passed to dump_stack(), we fetch the frame
pointer from the regs but the stack pointer is taken from
the current frame.

Thus the frame and stack pointers may not come from the same
context. For example this can result in the unwinder to
think the context is in irq, due to the current value of
the stack, but the frame pointer coming from the regs points
to a frame from another place. It then tries to fix up
the irq link but ends up dereferencing a random frame
pointer that doesn't belong to the irq stack:

[ 9131.706906] ------------[ cut here ]------------
[ 9131.707003] WARNING: at arch/x86/kernel/dumpstack_64.c:129 dump_trace+0x2aa/0x330()
[ 9131.707003] Hardware name: AMD690VM-FMH
[ 9131.707003] Perf: bad frame pointer = 0000000000000005 in callchain
[ 9131.707003] Modules linked in:
[ 9131.707003] Pid: 1050, comm: perf Not tainted 3.0.0-rc3+ #181
[ 9131.707003] Call Trace:
[ 9131.707003]  <IRQ>  [<ffffffff8104bd4a>] warn_slowpath_common+0x7a/0xb0
[ 9131.707003]  [<ffffffff8104be21>] warn_slowpath_fmt+0x41/0x50
[ 9131.707003]  [<ffffffff8178b873>] ? bad_to_user+0x6d/0x10be
[ 9131.707003]  [<ffffffff8100c2da>] dump_trace+0x2aa/0x330
[ 9131.707003]  [<ffffffff810107d3>] ? native_sched_clock+0x13/0x50
[ 9131.707003]  [<ffffffff8101b164>] perf_callchain_kernel+0x54/0x70
[ 9131.707003]  [<ffffffff810d391f>] perf_prepare_sample+0x19f/0x2a0
[ 9131.707003]  [<ffffffff810d546c>] __perf_event_overflow+0x16c/0x290
[ 9131.707003]  [<ffffffff810d5430>] ? __perf_event_overflow+0x130/0x290
[ 9131.707003]  [<ffffffff810107d3>] ? native_sched_clock+0x13/0x50
[ 9131.707003]  [<ffffffff8100fbb9>] ? sched_clock+0x9/0x10
[ 9131.707003]  [<ffffffff810752e5>] ? T.375+0x15/0x90
[ 9131.707003]  [<ffffffff81084da4>] ? trace_hardirqs_on_caller+0x64/0x180
[ 9131.707003]  [<ffffffff810817bd>] ? trace_hardirqs_off+0xd/0x10
[ 9131.707003]  [<ffffffff810d5764>] perf_event_overflow+0x14/0x20
[ 9131.707003]  [<ffffffff810d588c>] perf_swevent_hrtimer+0x11c/0x130
[ 9131.707003]  [<ffffffff817821a1>] ? error_exit+0x51/0xb0
[ 9131.707003]  [<ffffffff81072e93>] __run_hrtimer+0x83/0x1e0
[ 9131.707003]  [<ffffffff810d5770>] ? perf_event_overflow+0x20/0x20
[ 9131.707003]  [<ffffffff81073256>] hrtimer_interrupt+0x106/0x250
[ 9131.707003]  [<ffffffff812a3bfd>] ? trace_hardirqs_off_thunk+0x3a/0x3c
[ 9131.707003]  [<ffffffff81024833>] smp_apic_timer_interrupt+0x53/0x90
[ 9131.707003]  [<ffffffff81789053>] apic_timer_interrupt+0x13/0x20
[ 9131.707003]  <EOI>  [<ffffffff817821a1>] ? error_exit+0x51/0xb0
[ 9131.707003]  [<ffffffff8178219c>] ? error_exit+0x4c/0xb0
[ 9131.707003] ---[ end trace b2560d4876709347 ]---

Fix this by simply taking the stack pointer from regs->sp
when regs are provided.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
arch/x86/kernel/dumpstack_64.c