Messages in this thread | | | Date | Tue, 17 May 2005 09:55:28 -0700 | From | Chris Wright <> | Subject | Re: 2.6.12-rc4-mm2 - sleeping function called from invalid context at mm/slab.c:2502 |
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* Valdis.Kletnieks@vt.edu (Valdis.Kletnieks@vt.edu) wrote: > It threw 5 of them in short succession. Different entry points into > avc_has_perm(). Here's the tracebacks:
I'm guessing this is from my change to use single skb for audit buffer instead of a temp buffer.
> [4295584.974000] Debug: sleeping function called from invalid context at mm/slab.c:2502 > [4295584.974000] in_atomic():1, irqs_disabled():0
This is gfp_any() flag that's used here, which I think is the problem.
> [4295584.974000] [<c01035a8>] dump_stack+0x15/0x17 > [4295584.974000] [<c013ba6d>] kmem_cache_alloc+0x1e/0x6a > [4295584.974000] [<c02de4fa>] skb_clone+0x14/0x183 > [4295584.974000] [<c02ef64a>] netlink_unicast+0x7d/0x171
Here and up we are in netlink code which does netlink_trim to reduce the skb data size before queing to socket. This does skb_clone with gfp_any() flag. We aren't in softirq, so we get GFP_KERNEL flag set even though in_atomic() is true (spin_lock held I'm assuming).
> [4295584.974000] [<c0130947>] audit_log_end_fast+0xf5/0x188 > [4295584.974000] [<c01c3c56>] avc_audit+0x94d/0x958 > [4295584.974000] [<c01c3ffb>] avc_has_perm+0x3b/0x48 > [4295584.974000] [<c01c8022>] selinux_socket_unix_stream_connect+0x6f/0xa8 > [4295584.974000] [<c032b740>] unix_stream_connect+0x228/0x482 > [4295584.974000] [<c02dbab6>] sys_connect+0x6a/0x81 > [4295584.974000] [<c02dc23b>] sys_socketcall+0x6f/0x166 > [4295584.974000] [<c01026cf>] sysenter_past_esp+0x54/0x75 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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