locked vnode / nfs... requires kill -9 in ddb

[Kostik Belousov]

On Wed, Oct 18, 2006 at 10:01:45AM -0600, John E Hein wrote:
> 6.2-PRERELEASE from 20061016 RELENG_6 sources.
> Locked vnodes
>  
> 0xc6b7bdd0: tag nfs, type VDIR
>     usecount 2, writecount 0, refcount 8 mountedhere 0
>     flags (VV_ROOT)
>     v_object 0xc9d84108 ref 0 pages 0
>      lock type nfs: EXCL (count 1) by thread 0xc8adac00 (pid 50746) with 5 pending
>         fileid 8 fsid 0x300ff06
> 
> 50746 50000 49999   600  T+                          sh
>  .
>  .
> db>db> trace 50746
> Tracing pid 50746 tid 100231 td 0xc8adac00
> sched_switch(c8adac00,0,2) at 0xc05ce0cb = sched_switch+0x173
> mi_switch(2,0) at 0xc05c2b0a = mi_switch+0x1ba
> thread_suspend_check(1,c079e04c,c8adac00,c9206b80,1,...) at 0xc05c722d = thread_suspend_check+0x191
> sleepq_catch_signals(c9206b80) at 0xc05db93f = sleepq_catch_signals+0x103
> sleepq_wait_sig(c9206b80) at 0xc05dbd96 = sleepq_wait_sig+0xe
> msleep(c9206b80,c08a6a40,153,c0813379,0) at 0xc05c2652 = msleep+0x25a
> nfs_reply(c9206b80,0,c8adac00,4,c7ea7100,...) at 0xc06c33ac = nfs_reply+0x244
> nfs_request(c6b7bdd0,c6ae2d00,1,c8adac00,c7815280,e8f3488c,e8f34890,e8f34894,c8adac00,e8f348a0) at 0xc06c40a5 = nfs_request+0x3c1
> nfs_getattr(e8f348dc) at 0xc06c912b = nfs_getattr+0x11f
> VOP_GETATTR_APV(c086c700,e8f348dc) at 0xc07b260c = VOP_GETATTR_APV+0x38
> nfsspec_access(e8f34a8c,c6bf7c94,0,e8f349a4,c060ca26,...) at 0xc06cebf1 = nfsspec_access+0x85
> nfs_access(e8f34a8c) at 0xc06c8b7a = nfs_access+0x122
> VOP_ACCESS_APV(c086c700,e8f34a8c) at 0xc07b25b0 = VOP_ACCESS_APV+0x38
> nfs_lookup(e8f34b18) at 0xc06c96ff = nfs_lookup+0xd3
> VOP_LOOKUP_APV(c086c700,e8f34b18) at 0xc07b22f7 = VOP_LOOKUP_APV+0x43
> lookup(e8f34c00) at 0xc060ee79 = lookup+0x4c1
> namei(e8f34c00) at 0xc060e71a = namei+0x39a
> kern_stat(c8adac00,806712c,0,e8f34c74) at 0xc061d3cd = kern_stat+0x35
> stat(c8adac00,e8f34d04) at 0xc061d37b = stat+0x1b
> syscall(3b,3b,3b,1,80670ec,...) at 0xc07a9363 = syscall+0x2bf
> Xint0x80_syscall() at 0xc079456f = Xint0x80_syscall+0x1f
> --- syscall (188, FreeBSD ELF32, stat), eip = 0x28196477, esp = 0xbfbfdc1c, ebp = 0xbfbfdcb8 ---
> db> kill 9 50746
> db> c

The nfs_reply is sleeping with the PCATCH set. The question is why SIGTSTP
does not cause msleep to return with EINTR.
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