[Bug runtime/13386] New: BUG: using smp_processor_id() in preemptible code

["mjw at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13386

             Bug #: 13386
           Summary: BUG: using smp_processor_id() in preemptible code
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: mjw@redhat.com
    Classification: Unclassified


Found this in my logs:

Nov  5 13:56:49 armando kernel: [ 1353.700391] BUG: using smp_processor_id() in
preemptible [00000000] code: stapio/20061
Nov  5 13:56:49 armando kernel: [ 1353.700523] caller is
_stp_cleanup_and_exit+0x240/0x2c8 [stap_08fb73e8603c2f873ec67447b857d69_20061]
Nov  5 13:56:49 armando kernel: [ 1353.700565] Backtrace:
Nov  5 13:56:49 armando kernel: [ 1353.700677] [<c00428d0>]
(unwind_backtrace+0x0/0xe0) from [<c023e610>]
(debug_smp_processor_id+0xbc/0xf0)
Nov  5 13:56:49 armando kernel: [ 1353.700808] [<c023e610>]
(debug_smp_processor_id+0xbc/0xf0) from [<bf3cb8d4>]
(_stp_cleanup_and_exit+0x240/0x2c8
[stap_08fb73e8603c2f873ec67447b857d69_20061])
Nov  5 13:56:49 armando kernel: [ 1353.701024] [<bf3cb8d4>]
(_stp_cleanup_and_exit+0x240/0x2c8
[stap_08fb73e8603c2f873ec67447b857d69_20061]) from [<bf3cbf84>]
(_stp_ctl_write_cmd+0x628/0x950 [stap_08fb73e8603c2f873ec67447b857d69_20061])
Nov  5 13:56:49 armando kernel: [ 1353.701179] [<bf3cbf84>]
(_stp_ctl_write_cmd+0x628/0x950 [stap_08fb73e8603c2f873ec67447b857d69_20061])
from [<c01139c8>] (vfs_write+0xb0/0x178)
Nov  5 13:56:49 armando kernel: [ 1353.701267] [<c01139c8>]
(vfs_write+0xb0/0x178) from [<c0113ca8>] (sys_write+0x3c/0x68)
Nov  5 13:56:49 armando kernel: [ 1353.701359] [<c0113ca8>]
(sys_write+0x3c/0x68) from [<c003b760>] (ret_fast_syscall+0x0/0x30)

I don't immediately see where in _stp_cleanup_and_exit() we would use
smp_processor_id(), but if we do, then that would probably be a bug if we could
be preempted, which it seems we can here.

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