Messages in this thread | | | Date | Thu, 17 Mar 2011 13:25:08 +0100 | Subject | um: WARNING: at kernel/futex.c:786 __unqueue_futex | From | richard -rw- weinberger <> |
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Lai,
Your commit 2e12978a (futex,plist: Pass the real head of the priority list to plist_del()) triggers gazillions warnings on User Mode Linux (x86, Linus' tree as of today):
------------[ cut here ]------------ WARNING: at kernel/futex.c:786 __unqueue_futex+0x12/0x16() Modules linked in: 27d4cce8: [<081c13fe>] dump_stack+0x1c/0x20 27d4cd00: [<08071aa0>] warn_slowpath_common+0x49/0x5f 27d4cd18: [<08071acb>] warn_slowpath_null+0x15/0x19 27d4cd28: [<0808fdb8>] __unqueue_futex+0x12/0x16 27d4cd38: [<0808fef3>] futex_wait+0x137/0x1ed 27d4cdd0: [<080910c3>] do_futex+0x78/0x7c4 27d4cedc: [<080918e6>] sys_futex+0xd7/0xed 27d4cf28: [<0805abf6>] handle_syscall+0x7a/0x98 27d4cf78: [<080685d9>] userspace+0x2c9/0x370 27d4cfe0: [<08058be5>] fork_handler+0x53/0x5b 27d4cffc: [<00000000>] 0x0
---[ end trace ed7709f235f82328 ]---
!spin_is_locked(q->lock_ptr) in the WARN_ON() at line 786 triggers the warnings.
I'm not sure whether this shows a bug within UML or the WARN_ON() is wrong.
What do you think?
-- Thanks, //richard
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