Ingo Molnar 67f2de0bf9 x86: dumpstack, 64-bit: Disable preemption when walking the IRQ/exception stacks ... This warning: [ 847.140022] rb_producer D 0000000000000000 5928 519 2 0x00000000 [ 847.203627] BUG: using smp_processor_id() in preemptible [00000000] code: khungtaskd/517 [ 847.207360] caller is show_stack_log_lvl+0x2e/0x241 [ 847.210364] Pid: 517, comm: khungtaskd Not tainted 2.6.32-rc8-tip+ #13761 [ 847.213395] Call Trace: [ 847.215847] [<ffffffff81413bde>] debug_smp_processor_id+0x1f0/0x20a [ 847.216809] [<ffffffff81015eae>] show_stack_log_lvl+0x2e/0x241 [ 847.220027] [<ffffffff81018512>] show_stack+0x1c/0x1e [ 847.223365] [<ffffffff8107b7db>] sched_show_task+0xe4/0xe9 [ 847.226694] [<ffffffff8112f21f>] check_hung_task+0x140/0x199 [ 847.230261] [<ffffffff8112f4a8>] check_hung_uninterruptible_tasks+0x1b7/0x20f [ 847.233371] [<ffffffff8112f500>] ? watchdog+0x0/0x50 [ 847.236683] [<ffffffff8112f54e>] watchdog+0x4e/0x50 [ 847.240034] [<ffffffff810cee56>] kthread+0x97/0x9f [ 847.243372] [<ffffffff81012aea>] child_rip+0xa/0x20 [ 847.246690] [<ffffffff81e43494>] ? restore_args+0x0/0x30 [ 847.250019] [<ffffffff81e43083>] ? _spin_lock+0xe/0x10 [ 847.253351] [<ffffffff810cedbf>] ? kthread+0x0/0x9f [ 847.256833] [<ffffffff81012ae0>] ? child_rip+0x0/0x20 Happens because on preempt-RCU, khungd calls show_stack() with preemption enabled. Make sure we are not preemptible while walking the IRQ and exception stacks on 64-bit. (32-bit stack dumping is preemption safe.) Signed-off-by: Ingo Molnar <mingo@elte.hu>		2009-11-26 08:29:10 +01:00
..
boot	x86: Document linker script ASSERT() quirk	2009-10-16 07:18:46 +02:00
configs	tracing: Rename FTRACE_SYSCALLS for tracepoints	2009-08-26 00:17:35 +02:00
crypto	crypto: aesni-intel - Fix irq_fpu_usable usage	2009-10-20 16:20:47 +09:00
ia32	x86-64: Fix register leak in 32-bit syscall audting	2009-10-26 16:23:26 +01:00
include/asm	Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-10-29 08:10:38 -07:00
kernel	x86: dumpstack, 64-bit: Disable preemption when walking the IRQ/exception stacks	2009-11-26 08:29:10 +01:00
kvm	KVM: MMU: fix pointer cast	2009-10-16 12:30:26 -03:00
lguest	lguest: move panic notifier registration to its expected place.	2009-09-23 22:26:44 +09:30
lib	x86: Don't generate cmpxchg8b_emu if CONFIG_X86_CMPXCHG64=y	2009-10-01 08:42:24 +02:00
math-emu
mm	x86: Suppress stack overrun message for init_task	2009-11-23 11:45:34 +01:00
oprofile	perf: Do the big rename: Performance Counters -> Performance Events	2009-09-21 14:28:04 +02:00
pci	const: mark struct vm_struct_operations	2009-09-27 11:39:25 -07:00
power	x86: Remove final bits of CONFIG_X86_OLD_MCE	2009-09-18 08:31:23 +02:00
vdso	kbuild: rename ld-option to cc-ldoption	2009-09-20 12:27:42 +02:00
video
xen	xen: set up mmu_ops before trying to set any ptes	2009-10-27 16:54:19 -07:00
Kbuild
Kconfig	x86: Remove STACKPROTECTOR_ALL	2009-10-23 16:35:23 +02:00
Kconfig.cpu	x86: Side-step lguest problem by only building cmpxchg8b_emu for pre-Pentium	2009-10-26 12:33:02 +01:00
Kconfig.debug	kmemcheck: make kconfig accessible for other architectures	2009-06-15 15:49:17 +02:00
Makefile	x86: Remove STACKPROTECTOR_ALL	2009-10-23 16:35:23 +02:00
Makefile_32.cpu	x86: add specific support for Intel Atom architecture	2009-08-23 11:20:02 +02:00