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locking/refcounts, x86/asm: Disable CONFIG_ARCH_HAS_REFCOUNT for the time being

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Mike Galbraith bisected a boot crash back to the following commit:

  7a46ec0e2f ("locking/refcounts, x86/asm: Implement fast refcount overflow protection")

The crash/hang pattern is:

 > Symptom is a few splats as below, with box finally hanging.  Network
 > comes up, but neither ssh nor console login is possible.
 >
 >  ------------[ cut here ]------------
 >  WARNING: CPU: 4 PID: 0 at net/netlink/af_netlink.c:374 netlink_sock_destruct+0x82/0xa0
 >  ...
 >  __sk_destruct()
 >  rcu_process_callbacks()
 >  __do_softirq()
 >  irq_exit()
 >  smp_apic_timer_interrupt()
 >  apic_timer_interrupt()

We are at -rc7 already, and the code has grown some dependencies, so
instead of a plain revert disable the config temporarily, in the hope
of getting real fixes.

Reported-by: Mike Galbraith <efault@gmx.de>
Tested-by: Mike Galbraith <efault@gmx.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Elena Reshetova <elena.reshetova@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/tip-7a46ec0e2f4850407de5e1d19a44edee6efa58ec@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2017-08-29 13:10:35 +02:00
parent 30d6e0a419
commit 7b3d61cc73
1 changed files with 2 additions and 1 deletions
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3
arch/x86/Kconfig
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@ -55,7 +55,8 @@ config X86
select ARCH_HAS_KCOV if X86_64
select ARCH_HAS_MMIO_FLUSH
select ARCH_HAS_PMEM_API if X86_64
select ARCH_HAS_REFCOUNT
# Causing hangs/crashes, see the commit that added this change for details.
select ARCH_HAS_REFCOUNT if BROKEN
select ARCH_HAS_UACCESS_FLUSHCACHE if X86_64
select ARCH_HAS_SET_MEMORY
select ARCH_HAS_SG_CHAIN