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Date: Thu, 16 Aug 2007 09:39:39 +0200 From: Peter Zijlstra <peterz@...radead.org> To: john stultz <johnstul@...ibm.com> Cc: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>, lkml <linux-kernel@...r.kernel.org> Subject: Re: [BUG -rt] circular locking deadlock On Wed, 2007-08-15 at 18:39 -0700, john stultz wrote: > Hey Ingo, Thomas, > > I was playing with the latency tracer on 2.6.23-rc2-rt2 while a "make > -j8" was going on in the background and the box hung with this on the > console: Hmm, this would have been me :-/ I'll go play... > ============================================ > [ BUG: circular locking deadlock detected! ] > -------------------------------------------- > cc1/7161 is deadlocking current task cc1/7164 > > > 1) cc1/7164 is trying to acquire this lock: > [ffff8101fa375250] {&list->lock} > ... ->owner: ffff8101ef7f7162 > ... held by: cc1: 7161 [ffff8101ef7f7160, 120] > > 2) cc1/7161 is blocked on this lock: > [ffff8102118e5900] {&list->lock} > ... ->owner: ffff8100ddb3ace2 > ... held by: cc1: 7164 [ffff8100ddb3ace0, 120] > > cc1/7161's [blocked] stackdump: > > ffff8101f9423c68 0000000000000086 0000000100000000 0000000000000002 > ffffffff82205d00 0000000000000202 ffffffff82189280 ffff8101ef7f7160 > ffff8100ddb3ace0 ffff8101f9423c10 0000000000000202 0000000000000000 > Call Trace: > [<ffffffff8100c58c>] mcount+0x2c/0x3a > [<ffffffff817e6e6b>] schedule+0x3b/0x130 > [<ffffffff817e7feb>] rt_spin_lock_slowlock+0xdb/0x210 > [<ffffffff817e8b4d>] __rt_spin_lock+0x3d/0x50 > [<ffffffff817e8b6e>] rt_spin_lock+0xe/0x10 > [<ffffffff81297a62>] __lock_list+0x42/0x70 > [<ffffffff81297b43>] lock_list_splice_init+0x33/0xb0 > [<ffffffff810bf9d8>] file_move+0xc8/0xd0 > [<ffffffff810bc99e>] __dentry_open+0xae/0x1d0 > [<ffffffff810bcb84>] nameidata_to_filp+0x44/0x60 > [<ffffffff810bcbed>] do_filp_open+0x4d/0x60 > [<ffffffff817e8ace>] __lock_text_start+0xe/0x10 > [<ffffffff810bc8a3>] get_unused_fd_flags+0x103/0x130 > [<ffffffff810bcc61>] do_sys_open+0x61/0x100 > [<ffffffff810bcd40>] sys_open+0x20/0x30 > [<ffffffff8100c9a5>] tracesys+0x151/0x1be > > --------------------------- > | preempt count: 00000002 ] > | 2-level deep critical section nesting: > ---------------------------------------- > ... [<ffffffff817e5e33>] .... __schedule+0x23/0x265 > ......[<ffffffff817e6e6b>] .. ( <= schedule+0x3b/0x130) > ... [<ffffffff817e9041>] .... __spin_lock_irq+0x21/0x40 > ......[<ffffffff817e5ec4>] .. ( <= __schedule+0xb4/0x265) > > > cc1/7164's [current] stackdump: > > > Call Trace: > [<ffffffff8100e433>] show_stack+0x13/0x20 > [<ffffffff8106c643>] debug_rt_mutex_print_deadlock+0x163/0x180 > [<ffffffff817e7fe6>] rt_spin_lock_slowlock+0xd6/0x210 > [<ffffffff817e8b4d>] __rt_spin_lock+0x3d/0x50 > [<ffffffff817e8b6e>] rt_spin_lock+0xe/0x10 > [<ffffffff81297a62>] __lock_list+0x42/0x70 > [<ffffffff81297be6>] lock_list_del_init+0x26/0x70 > [<ffffffff810bf8fa>] file_kill+0x4a/0x60 > [<ffffffff810bfb8e>] __fput+0x12e/0x1d0 > [<ffffffff810bfcc5>] fput+0x25/0x30 > [<ffffffff810bc771>] filp_close+0x61/0x90 > [<ffffffff810bded9>] sys_close+0xa9/0x100 > [<ffffffff8100c9a5>] tracesys+0x151/0x1be > > --------------------------- > | preempt count: 00000000 ] > | 0-level deep critical section nesting: > ---------------------------------------- > > [ turning off deadlock detection.Please report this trace. ] - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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