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linux/arch/arc/kernel
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Vineet Gupta 3e25867ac4 ARC: stack unwinding: don't assume non-current task is sleeping 
[ Upstream commit e42404fa10 ]

To start stack unwinding (SP, PC and BLINK) are needed. When the
explicit execution context (pt_regs etc) is not available, unwinder
assumes the task is sleeping (in __switch_to()) and fetches SP and BLINK
from kernel mode stack.

But this assumption is not true, specially in a SMP system, when top
runs on 1 core, there may be active running processes on all cores.

So when unwinding non courrent tasks, ensure they are NOT running.

And while at it, handle the self unwinding case explicitly.

This came out of investigation of a customer reported hang with
rcutorture+top

Link: https://github.com/foss-for-synopsys-dwc-arc-processors/linux/issues/31
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-12-30 11:25:38 +01:00
..
.gitignore ARC: Add some .gitignore entries 2013-08-26 09:40:24 +05:30
arc_hostlink.c ARC: Hostlink Pseudo-Driver for Metaware Debugger 2013-02-15 23:16:10 +05:30
arcksyms.c ARC: export __udivdi3 for modules 2016-08-19 14:09:33 -07:00
asm-offsets.c ARCv2: [vdk] dts files and defconfig for HS38 VDK 2015-06-25 06:00:21 +05:30
ctx_sw_asm.S ARC: dw2 unwind: enable cfi pseudo ops in string lib 2016-09-30 14:48:22 -07:00
ctx_sw.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h> 2017-03-02 08:42:34 +01:00
devtree.c ARC: [plat-hsdk] initial port for HSDK board 2017-09-01 11:26:28 -07:00
disasm.c ARC: rename kconfig option for unaligned emulation 2014-10-13 14:46:15 +05:30
entry-arcv2.S ARCv2: support manual regfile save on interrupts 2019-03-23 20:09:51 +01:00
entry-compact.S ARC: typos fix in kernel/entry-compact.S 2017-08-28 15:17:36 -07:00
entry.S Revert "ARC: entry: fix potential EFA clobber when TIF_SYSCALL_TRACE" 2020-11-10 12:36:01 +01:00
fpu.c ARC: Process-creation/scheduling/idle-loop 2013-02-11 20:00:38 +05:30
head.S ARC: enable uboot support unconditionally 2019-08-06 19:06:57 +02:00
intc-arcv2.c ARCv2: support manual regfile save on interrupts 2019-03-23 20:09:51 +01:00
intc-compact.c ARCv2: SMP: Mask only private-per-core IRQ lines on boot at core intc 2017-08-28 16:11:15 -07:00
irq.c ARC: Enable machine_desc->init_per_cpu for !CONFIG_SMP 2018-06-20 16:12:06 -07:00
kgdb.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
kprobes.c bpf/error-inject/kprobes: Clear current_kprobe and enable preempt in kprobe 2018-06-21 12:33:19 +02:00
Makefile ARC: Remove empty kernel/pcibios.c 2017-08-02 14:53:35 -05:00
mcip.c ARC: mcip: update MCIP debug mask when the new cpu came online 2018-02-28 10:45:31 -08:00
module.c ARC: module: Fix !CONFIG_ARC_DW2_UNWIND builds 2017-01-18 11:17:44 -08:00
perf_event.c ARC: perf: Accommodate big-endian CPU 2019-12-01 09:17:37 +01:00
process.c ARC: clone syscall to setp r25 as thread pointer 2018-10-05 14:33:29 -07:00
ptrace.c ARCv2: ptrace: provide regset for accumulator/r30 regs 2017-05-03 11:21:31 -07:00
reset.c arc: export symbol for pm_power_off in reset.c 2013-11-06 10:41:44 +05:30
setup.c ARC: Fix ICCM & DCCM runtime size checks 2020-06-07 13:17:55 +02:00
signal.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
smp.c ARC: setup cpu possible mask according to possible-cpus dts property 2018-02-28 10:45:32 -08:00
stacktrace.c ARC: stack unwinding: don't assume non-current task is sleeping 2020-12-30 11:25:38 +01:00
sys.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
traps.c Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2018-01-30 14:18:52 -08:00
troubleshoot.c ARC: show_regs: lockdep: re-enable preemption 2019-09-16 08:22:02 +02:00
unaligned.c ARC: [arcompact] brown paper bag bug in unaligned access delay slot fixup 2017-02-07 10:02:01 -08:00
unwind.c ARC: hide unused function unw_hdr_alloc 2019-07-21 09:03:14 +02:00
vmlinux.lds.S nmi_backtrace: generate one-line reports for idle cpus 2016-10-07 18:46:30 -07:00