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SubjectRe: 2.6.17-mm2 hrtimer code wedges at boot?
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On Mon, 2006-06-26 at 17:41 -0400, Valdis.Kletnieks@vt.edu wrote:
> On Sat, 24 Jun 2006 06:19:14 PDT, Andrew Morton said:
> >
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.17/2.6.17-mm2/
>
> I'm seeing a 2-minute or so hang at system startup, seems to be hrtimer
> related. This is at fairly early userspace - the initrd has run, but we're not
> into /etc/rc.sysinit yet (although the root filesystem is mounted and we have
> a kjournald for it). Poking with sysrq-T and sysrq-R gets me this:
>
> [ 108.301806] Pid: 4, comm: khelper
> [ 108.330565] EIP: 0060:[<c0119f48>] CPU: 0
> [ 108.359315] EIP is at getnstimeofday+0x9e/0xb8
> [ 108.387820] EFLAGS: 00000207 Not tainted (2.6.17-mm2 #1)
> [ 108.416344] EAX: efed073c EBX: efed073c ECX: 00000000 EDX: 0f16d9ba
> [ 108.444765] ESI: a7955c5a EDI: 4a12cf06 EBP: effd0e5c DS: 007b ES: 007b
> [ 108.473303] CR0: 8005003b CR2: b7d9acb0 CR3: 2ffbc000 CR4: 000006d0
> [ 108.501579] <c0125c0c> ktime_get_ts+0x14/0x3f <c0110f84> copy_process+0x395/0x1111
> [ 108.530366] <c0111f3c> do_fork+0x8d/0x16a <c0100a27> kernel_thread+0x6c/0x74
> [ 108.559363] <c0120431> __call_usermodehelper+0x2b/0x44 <c0120982> run_workqueue+0x94/0xe9
> [ 108.588523] <c0120e64> worker_thread+0xe1/0x115 <c01232b2> kthread+0xb0/0xdc
> [ 108.617618] <c01006c5> kernel_thread_helper+0x5/0xb
> [ 115.881903] SysRq : Show Regs
> [ 115.910288]
> [ 115.938097] Pid: 4, comm: khelper
> [ 115.965908] EIP: 0060:[<c0119f48>] CPU: 0
> [ 115.993553] EIP is at getnstimeofday+0x9e/0xb8
> [ 116.020928] EFLAGS: 00000287 Not tainted (2.6.17-mm2 #1)
> [ 116.048387] EAX: efed073c EBX: efed073c ECX: 00000000 EDX: 0f16d9ba
> [ 116.075750] ESI: 9484965a EDI: 2262af5b EBP: effd0e5c DS: 007b ES: 007b
> [ 116.103240] CR0: 8005003b CR2: b7d9acb0 CR3: 2ffbc000 CR4: 000006d0
> [ 116.130449] <c0125c0c> ktime_get_ts+0x14/0x3f <c0110f84> copy_process+0x395/0x1111
> [ 116.158078] <c0111f3c> do_fork+0x8d/0x16a <c0100a27> kernel_thread+0x6c/0x74
> [ 116.185729] <c0120431> __call_usermodehelper+0x2b/0x44 <c0120982> run_workqueue+0x94/0xe9
> [ 116.213729] <c0120e64> worker_thread+0xe1/0x115 <c01232b2> kthread+0xb0/0xdc
> [ 116.241689] <c01006c5> kernel_thread_helper+0x5/0xb
>
> Looking at the body of ktime_get_ts, I see:
>
> do {
> seq = read_seqbegin(&xtime_lock);
> getnstimeofday(ts);
> tomono = wall_to_monotonic;
>
> } while (read_seqretry(&xtime_lock, seq));
>
> Which looks like a good place to get hung in a loop for a while....
>
> Eventually (after about 2 minutes, it finally unwedges and continues on.
>
> Any ideas?

It does look like something is hogging the xtime_lock. Does this occur
w/o HRT enabled?

Could you also send me your .config and dmesg please?

thanks
-john


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