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  • Ingo Molnar's avatar
    locking/refcounts, x86/asm: Disable CONFIG_ARCH_HAS_REFCOUNT for the time being · 7b3d61cc
    Ingo Molnar authored
    Mike Galbraith bisected a boot crash back to the following commit:
    
      7a46ec0e
    
     ("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: default avatarMike Galbraith <efault@gmx.de>
    Tested-by: default avatarMike 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: default avatarIngo Molnar <mingo@kernel.org>
    7b3d61cc