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linux/arch/mips/kernel
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Dmitry Adamushko c90e6fbb22 MIPS: Fix endless loop when processing signals for kernel tasks 
The problem occurs [1] when a kernel-mode task returns from a system
call with a pending signal.

A real-life scenario is a child of 'khelper' returning from a failed
kernel_execve() in ____call_usermodehelper() [ kernel/kmod.c ].
kernel_execve() fails due to a pending SIGKILL, which is the result of
"kill -9 -1" (at least, busybox's init does it upon reboot).

The loop is as follows:

* syscall_exit_work:
 - work_pending:            // start_of_the_loop
 - work_notifysig:
   - do_notify_resume()
     - do_signal()
       - if (!user_mode(regs)) return;
 - resume_userspace         // TIF_SIGPENDING is still set
 - work_pending             // so we call work_pending => goto
                            // start_of_the_loop

More information can be found in another LKML thread:
http://www.serverphorums.com/read.php?12,457826

[1] The problem was also reproduced on !CONFIG_VM86 x86, and the
following fix was accepted.

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=29a2e2836ff9ea65a603c89df217f4198973a74f

Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3571/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2012-12-05 19:59:00 +01:00
..
cpufreq
MIPS: Loongson 2: Sort out clock managment.
2012-08-01 18:10:06 +02:00
.gitignore
[MIPS] Ignore vmlinux.lds generated files
2008-08-26 09:10:27 +01:00
8250-platform.c
mips: remove needless include of module.h from core kernel files.
2011-10-31 19:30:57 -04:00
asm-offsets.c
MIPS: asm-offset.c: Delete unused irq_cpustat_t struct offsets.
2012-10-11 11:11:20 +02:00
binfmt_elfn32.c
…
binfmt_elfo32.c
MIPS: 64-bit: Fix o32 core dump
2009-07-03 15:45:27 +01:00
bmips_vec.S
MIPS: BMIPS: Add SMP support code for BMIPS43xx/BMIPS5000
2011-12-07 22:03:18 +00:00
branch.c
MIPS Kprobes: Refactor branch emulation
2011-12-07 22:04:03 +00:00
cevt-bcm1480.c
MIPS: irq: Remove IRQF_DISABLED
2011-12-07 22:03:45 +00:00
cevt-ds1287.c
MIPS: irq: Remove IRQF_DISABLED
2011-12-07 22:03:45 +00:00
cevt-gt641xx.c
MIPS: irq: Remove IRQF_DISABLED
2011-12-07 22:03:45 +00:00
cevt-r4k.c
MIPS: Add EIC support for GIC.
2012-09-13 15:43:49 -05:00
cevt-sb1250.c
MIPS: irq: Remove IRQF_DISABLED
2011-12-07 22:03:45 +00:00
cevt-smtc.c
MIPS: Add missing #inclusions of <linux/irq.h>
2010-10-07 14:08:54 +01:00
cevt-txx9.c
MIPS: irq: Remove IRQF_DISABLED
2011-12-07 22:03:45 +00:00
cpu-bugs64.c
Disintegrate asm/system.h for MIPS
2012-03-28 18:30:02 +01:00
cpu-probe.c
MIPS: R3000/R3081: Fix CPU detection.
2012-12-05 19:58:54 +01:00
csrc-bcm1480.c
mips: convert to clocksource_register_hz/khz
2011-02-21 13:33:50 -08:00
csrc-ioasic.c
mips: convert to clocksource_register_hz/khz
2011-02-21 13:33:50 -08:00
csrc-powertv.c
mips: convert to clocksource_register_hz/khz
2011-02-21 13:33:50 -08:00
csrc-r4k.c
mips: convert to clocksource_register_hz/khz
2011-02-21 13:33:50 -08:00
csrc-sb1250.c
mips: convert to clocksource_register_hz/khz
2011-02-21 13:33:50 -08:00
early_printk.c
[MIPS] fix sparse warning about setup_early_printk()
2008-07-15 18:44:29 +01:00
entry.S
MIPS: Fix endless loop when processing signals for kernel tasks
2012-12-05 19:59:00 +01:00
ftrace.c
MIPS: Ftrace: Fix the CONFIG_DYNAMIC_FTRACE=n compile
2011-09-21 17:52:04 +02:00
genex.S
MIPS: Read watch registers with interrupts disabled.
2009-01-30 21:32:58 +00:00
gpio_txx9.c
[MIPS] txx9: Make gpio_txx9 entirely spinlock-safe
2008-07-15 18:44:34 +01:00
head.S
MIPS: Avoid potential hazard on Context register
2009-11-02 12:00:07 +01:00
i8253.c
MIPS: irq: Remove IRQF_DISABLED
2011-12-07 22:03:45 +00:00
i8259.c
MIPS: i8259: Mark cascade interrupt non-threaded
2011-09-21 17:52:28 +02:00
irq_cpu.c
Disintegrate asm/system.h for MIPS
2012-03-28 18:30:02 +01:00
irq_txx9.c
MIPS: Convert the irq functions to the new names
2011-03-29 14:48:07 +02:00
irq-gic.c
MIPS: Make VPE count to be one-based.
2012-09-13 15:43:51 -05:00
irq-gt641xx.c
MIPS: Convert the irq functions to the new names
2011-03-29 14:48:07 +02:00
irq-msc01.c
mips: remove needless include of module.h from core kernel files.
2011-10-31 19:30:57 -04:00
irq-rm7000.c
Disintegrate asm/system.h for MIPS
2012-03-28 18:30:02 +01:00
irq-rm9000.c
Disintegrate asm/system.h for MIPS
2012-03-28 18:30:02 +01:00
irq.c
Disintegrate asm/system.h for MIPS
2012-03-28 18:30:02 +01:00
jump_label.c
MIPS: jump label: Add MIPS support.
2011-01-18 19:30:24 +01:00
kgdb.c
mips,kgdb: fix recursive page fault with CONFIG_KPROBES
2012-10-12 06:37:34 -05:00
kprobes.c
MIPS Kprobes: Support branch instructions probing
2011-12-07 22:04:03 +00:00
linux32.c
vfs: define struct filename and have getname() return it
2012-10-12 20:14:55 -04:00
machine_kexec.c
…
Makefile
Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
2012-10-14 14:39:05 -07:00
mcount.S
MIPS: tracing: Fix the indentation of mcount.S
2010-08-05 13:26:06 +01:00
mips_ksyms.c
MIPS: Refactor 'clear_page' and 'copy_page' functions.
2012-07-19 11:23:43 +02:00
mips_machine.c
MIPS: Add generic support for multiple machines within a single kernel
2011-01-18 19:30:21 +01:00
mips-mt-fpaff.c
remove references to cpu_*_map in arch/
2012-03-29 15:38:30 +10:30
mips-mt.c
Merge branch 'master' into for-next
2012-04-08 21:48:52 +02:00
module-rela.c
MIPS: Fix module.c build for 32 bit
2012-09-28 14:31:02 +09:30
module.c
MIPS: Fix module.c build for 32 bit
2012-09-28 14:31:02 +09:30
octeon_switch.S
MIPS: Fix race condition with FPU thread task flag during context switch.
2012-07-19 11:23:43 +02:00
perf_event_mipsxx.c
MIPS: perf: Add perf functionality for BMIPS5000
2012-10-11 11:04:34 +02:00
perf_event.c
MIPS: perf: Reorganize contents of perf support files.
2011-10-24 23:34:26 +01:00
proc.c
MIPS: proc: Cleanup printing of ASEs.
2012-10-11 11:10:43 +02:00
process.c
Disintegrate asm/system.h for MIPS
2012-03-28 18:30:02 +01:00
prom.c
MIPS: Prune some target specific code out of prom.c
2012-07-23 13:54:52 +01:00
ptrace32.c
Disintegrate asm/system.h for MIPS
2012-03-28 18:30:02 +01:00
ptrace.c
seccomp: ignore secure_computing return values
2012-04-18 12:24:50 +10:00
r4k_fpu.S
update David Miller's old email address
2011-04-06 06:19:38 -07:00
r4k_switch.S
MIPS: Fix race condition with FPU thread task flag during context switch.
2012-07-19 11:23:43 +02:00
r2300_fpu.S
update David Miller's old email address
2011-04-06 06:19:38 -07:00
r2300_switch.S
MIPS: Fix race condition with FPU thread task flag during context switch.
2012-07-19 11:23:43 +02:00
r6000_fpu.S
update David Miller's old email address
2011-04-06 06:19:38 -07:00
relocate_kernel.S
…
reset.c
mips: migrate core kernel file from module.h --> export.h
2011-10-31 19:30:56 -04:00
rtlx.c
Disintegrate asm/system.h for MIPS
2012-03-28 18:30:02 +01:00
scall32-o32.S
MIPS: Wire kcmp syscall.
2012-09-26 11:24:28 +02:00
scall64-64.S
MIPS: Wire kcmp syscall.
2012-09-26 11:24:28 +02:00
scall64-n32.S
MIPS: N32: Fix signalfd4 syscall entry point
2012-12-05 19:58:48 +01:00
scall64-o32.S
MIPS: Wire kcmp syscall.
2012-09-26 11:24:28 +02:00
setup.c
MIPS: Merge overlapping bootmem ranges
2012-11-23 18:44:37 +01:00
signal32.c
most of set_current_blocked() callers want SIGKILL/SIGSTOP removed from set
2012-06-01 12:58:51 -04:00
signal_n32.c
most of set_current_blocked() callers want SIGKILL/SIGSTOP removed from set
2012-06-01 12:58:51 -04:00
signal-common.h
most of set_current_blocked() callers want SIGKILL/SIGSTOP removed from set
2012-06-01 12:58:51 -04:00
signal.c
MIPS: Prevent hitting do_notify_resume() with !user_mode(regs).
2012-09-22 15:47:11 +02:00
smp-bmips.c
MIPS: BMIPS: delay irq enable to ->smp_finish()
2012-07-19 11:23:44 +02:00
smp-cmp.c
MIPS: CMP: Fix physical core number calculation logic
2012-10-18 11:45:41 +02:00
smp-mt.c
MIPS: Fix build error for non-malta VSMP kernel
2012-08-22 23:46:38 +02:00
smp-up.c
cpumask: arch_send_call_function_ipi_mask: mips
2009-09-24 09:34:45 +09:30
smp.c
MIPS: Synchronize MIPS count one CPU at a time
2012-08-17 10:57:28 +02:00
smtc-asm.S
…
smtc-proc.c
Disintegrate asm/system.h for MIPS
2012-03-28 18:30:02 +01:00
smtc.c
MIPS: SMTC: Support for Multi-threaded FPUs
2012-07-23 13:55:53 +01:00
spinlock_test.c
mips: migrate core kernel file from module.h --> export.h
2011-10-31 19:30:56 -04:00
spram.c
Disintegrate asm/system.h for MIPS
2012-03-28 18:30:02 +01:00
stacktrace.c
mips: migrate core kernel file from module.h --> export.h
2011-10-31 19:30:56 -04:00
sync-r4k.c
MIPS: Synchronize MIPS count one CPU at a time
2012-08-17 10:57:28 +02:00
syscall.c
vfs: define struct filename and have getname() return it
2012-10-12 20:14:55 -04:00
time.c
mips: migrate core kernel file from module.h --> export.h
2011-10-31 19:30:56 -04:00
topology.c
MIPS: Add arch generic CPU hotplug
2009-06-24 18:34:40 +01:00
traps.c
MIPS: Add CPU support for Loongson1B
2012-07-23 13:57:04 +01:00
unaligned.c
Disintegrate asm/system.h for MIPS
2012-03-28 18:30:02 +01:00
vdso.c
coredump: remove VM_ALWAYSDUMP flag
2012-03-23 16:58:42 -07:00
vmlinux.lds.S
MIPS: Align swapper_pg_dir to 64K for better TLB Refill code.
2012-10-11 11:02:40 +02:00
vpe.c
MIPS: MT: Remove kspd.
2012-10-11 11:14:12 +02:00
watch.c
MIPS: Add HARDWARE_WATCHPOINTS definitions and support code.
2008-10-11 16:18:56 +01:00