Messages in this thread | | | Date | Mon, 14 Nov 2005 14:48:57 -0500 | From | john cooper <> | Subject | Re: [BUG] Softlockup detected with linux-2.6.14-rt6 |
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Luca Falavigna wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > I found this softlockup bug involving arts daemon using a > linux-2.6.14-rt6 kernel (with "Complete Preemption" and "Detect Soft > Lockups" compiled in). > This bug does not happen everytime: I was able to reproduce it only > three times in a week. Here is the oops message (obtained from my > printer because system is frozen): > > BUG: artsd:4177, possible softlockup detected on CPU#0! > [<c0146db4>] softlockup_detected+0x34/0x40 (8) > [<c0146e69>] softlockup_tick+0xa9/axb0 (20) > [<c01388a1>] timer_interrupt+0x21/0x40 (12) > [<c014724e>] handle_IRQ_event+0x63/0xf0 (12) > [<c01476a3>] __do_IRQ+0xa3/0x150 (48) > [<c0105594>] do_IRQ+0x34/0x70 (40) > [<c0103d42>] common_interrupt+0x1a/0x20 (8) > [<c0103d42>] common_interrupt+0x1a/0x20 (20) > [<c01bfcc0>] __delay+0x20/0x30 (44) > [<c91f16a4>] snd_timer_close+0x1b4/0x2b0 [snd_timer] (12) > [<c0a7f36a>] fasync_helper+0x7a/0x100 (12) > [<c91f307c>] snd_timer_user_release+0x4c/0x80 [snd_timer] (28) > [<c016c14d>] __fput+0xad/0x1a0 (24) > [<c0a6a632>] filp_close+0x52/0x90 (40) > [<c016a6e0>] sys_close+0x70/0xc0 (24) > [<c01032fd>] syscall_call+0x7/0xb (28)
We are seeing this too, particularly [IIRC exclusively] on MIPS and PPC though there isn't any obvious target architecture correlation. It appears to be a false positive as the system seems otherwise responsive to general scheduling. It's on my list to address but not a priority just yet.
Adding a sched pri/policy printk to show_task() and inserting a call to show_state() in the softlockup detect routine should shed some light.
-john
-- john.cooper@timesys.com - 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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