Badari Pulavarty <[EMAIL PROTECTED]> wrote:
>
> I am not sure if this is related to your patch. But I ran into
> BUG() with sysrq-t with your patch.
>
> Thanks,
> Badari
>
> BUG: soft lockup detected on CPU#1!
>
> Modules linked in: joydev sg st floppy usbserial parport_pc lp parport
> ipv6 ohci_hcd i2c_amd756 i2c_core evdev usbcore raid0 dm_mod nls_utf8
> Pid: 15433, comm: bash Not tainted 2.6.11-mm1n
> RIP: 0010:[<ffffffff8013d094>] <ffffffff8013d094>{__do_softirq+84}
> RSP: 0018:ffff8101dff83f68 EFLAGS: 00000206
> RAX: ffffffff80651880 RBX: 0000000000000002 RCX: 0000000000000004
> RDX: 0000000000000002 RSI: 0000000000000103 RDI: ffff8101d7c77680
> RBP: ffff810177ffbe48 R08: 0000000000000002 R09: 0000000000000100
> R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
> R13: 00002aaaaaafb000 R14: 000000000000000a R15: 0000000000000001
> FS: 00002aaaab2890a0(0000) GS:ffffffff80651880(0000)
> knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 00002aaaaaafb000 CR3: 00000001bb2a0000 CR4: 00000000000006e0
>
> Call Trace:<IRQ> <ffffffff8013d165>{do_softirq+53}
> <ffffffff8010ef59>{apic_timer_interrupt+133}
> <EOI> <ffffffff80403055>{_spin_unlock_irqrestore+5}
> <ffffffff801bd357>{write_sysrq_trigger+55}
> <ffffffff80183579>{vfs_write+233}
> <ffffffff80183713>{sys_write+83}
> <ffffffff8010e5ce>{system_call+126}
That's probably just a false positive in Ingo's soft-lockup detector. Long
streams of irq-context serial console output will do that.
Ingo, we already have a touch_nmi_watchdog() in the sysrq code. It might be
worth adding a touch_softlockup_watchdog() wherever we have a
touch_nmi_watchdog().
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