Commit-ID: 7b3d61cc73a1abe4c2c7eaf00093b338c8b233b0
Gitweb: http://git.kernel.org/tip/7b3d61cc73a1abe4c2c7eaf00093b338c8b233b0
Author: Ingo Molnar <[email protected]>
AuthorDate: Tue, 29 Aug 2017 13:10:35 +0200
Committer: Ingo Molnar <[email protected]>
CommitDate: Tue, 29 Aug 2017 13:10:35 +0200
locking/refcounts, x86/asm: Disable CONFIG_ARCH_HAS_REFCOUNT for the time being
Mike Galbraith bisected a boot crash back to the following commit:
7a46ec0e2f48 ("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 <[email protected]>
Tested-by: Mike Galbraith <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Elena Reshetova <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link:
http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
---
arch/x86/Kconfig | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 6e01f58..efd9df5 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -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
