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Message-ID: <20081217111821.GH32491@kernel.dk> Date: Wed, 17 Dec 2008 12:18:21 +0100 From: Jens Axboe <jens.axboe@...cle.com> To: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com> Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Stephen Rothwell <sfr@...b.auug.org.au>, linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>, dm-devel@...hat.com, tglx@...utronix.de, mel@....ul.ie Subject: Re: [BUG] linux-next: 20081209 - kernel bug at __rcu_process_callbacks, while booting up On Wed, Dec 17 2008, Kamalesh Babulal wrote: > * Jens Axboe <jens.axboe@...cle.com> [2008-12-16 15:37:21]: > > > On Tue, Dec 16 2008, Kamalesh Babulal wrote: > > > * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> [2008-12-12 14:16:11]: > > > > > > > On Sat, Dec 13, 2008 at 01:10:26AM +0530, Kamalesh Babulal wrote: > > > > > * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> [2008-12-10 10:33:02]: > > > > > > > > > > > On Wed, Dec 10, 2008 at 11:39:36PM +0530, Kamalesh Babulal wrote: > > > > > > > * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> [2008-12-10 09:53:38]: > > > > > > > > > > > > > > > On Wed, Dec 10, 2008 at 10:00:07PM +0530, Kamalesh Babulal wrote: > > > > > > > > > * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> [2008-12-10 06:54:14]: > > > > > > > > > > > > > > > > > > > On Wed, Dec 10, 2008 at 05:27:21PM +0530, Kamalesh Babulal wrote: > > > > > > > > > > > Hi, > > > > > > > > > > > > > > > > > > > > > > Kernel bug is hit while booting up the next-20081208/09 kernels over > > > > > > > > > > > the x86_64 box. The IP is pointing to 0x0 and its stuck at > > > > > > > > > > > __rcu_process_callbacks. > > > > > > > > > > > > > > > > > > > > Kernel config? > > > > > > > > > > > > > > > > > > > > Thanx, Paul > > > > > > > > > > > > > > > > > > > Hi Paul, > > > > > > > > > > > > > > > > > > I have attached the kernel config file. > > > > > > > > > > > > > > > > Hello, Kamalesh, > > > > > > > > > > > > > > > > No significant recent changes in this area. Is this consistent? > > > > > > > > Any chance of "git bisect"? > > > > > > > > > > > > > > > > Thanx, Paul > > > > > > > > > > > > > > > Hi Paul, > > > > > > > > > > > > > > I tried reproducing it for three times and I was successfull in reproducing it thrice. > > > > > > > I have already started the git bisect, will update the results soon. > > > > > > > > > > > > Very good, looking forward to seeing the result! > > > > > > > > > > > > Thanx, Paul > > > > > > > > > > > Hi Paul, > > > > > > > > > > After a Complete round of git bisect, I was not able to reproduce the oops, > > > > > but when I tried again with complete next-20081209 patch, I am getting > > > > > different warning message altogether this time > > > > > > > > Might be that the two oopses are different manifestations of the same > > > > underlying problem, right? > > > > > > > > Thanx, Paul > > > > > > > Hi Paul, > > > > > > Your were right, those were the manifestation of the same > > > problem. Adding to it another calltrace was commonly visible > > > during the git-bisect. > > > > Did you try with a newer version? Should be fixed since last week. > > > > -- > > Jens Axboe > > > Hi Jens, > > I tried with the next-20081216 kernel, but the kernel was stuck > after loading the initrd image, passing unknown_nmi_panic=1, triggered > following call trace, > > Initializing CPU#0 > BUG: unable to handle kernel NULL pointer dereference at 0000000000000048 > IP: [<ffffffff8072c547>] init_ISA_irqs+0x20/0x5d > PGD 0 > Thread overran stack, or stack corrupted > Oops: 0002 [#1] SMP > last sysfs file: > CPU 0 > Modules linked in: > Pid: 0, comm: swapper Not tainted 2.6.28-rc8-next-20081216-autokern1 #1 > RIP: 0010:[<ffffffff8072c547>] [<ffffffff8072c547>] init_ISA_irqs+0x20/0x5d > RSP: 0018:ffffffff8071df38 EFLAGS: 00010093 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff80796e40 > RDX: 0000000000000100 RSI: 0000000000000092 RDI: 0000000000000000 > RBP: ffffffff8071df48 R08: 0000000000000000 R09: 0000000000000000 > R10: ffffffff8071df18 R11: 0000000000000070 R12: ffff88000103a040 > R13: cccccccccccccccd R14: 0000000000000000 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffffffff8070e3c0(0000) knlGS:0000000000000000 > CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b > CR2: 0000000000000048 CR3: 0000000000201000 CR4: 00000000000006a0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Process swapper (pid: 0, threadinfo ffffffff8071c000, task ffffffff806a43a0) > Stack: > cccccccccccccccd ffffffff80754aa0 ffffffff8071df68 ffffffff8072c591 > ffffffff8071df68 ffffffff8073ca50 ffffffff8071df98 ffffffff80725af2 > 0000000000000000 0000000000837a70 0000000000000000 0000000000000000 > Call Trace: > [<ffffffff8072c591>] native_init_IRQ+0xd/0x8a2 > [<ffffffff8073ca50>] ? rcu_init+0x9/0xb > [<ffffffff80725af2>] start_kernel+0x1a1/0x315 > [<ffffffff807252a0>] x86_64_start_reservations+0xaf/0xb3 > [<ffffffff807253a1>] x86_64_start_kernel+0xda/0xe1 > Code: 20 5f 6a 80 e8 63 08 cb ff c9 c3 55 48 89 e5 53 31 db 48 83 ec 08 e8 05 88 00 00 31 ff e8 cd 2f ae ff 89 df e8 4d d5 b3 ff 89 df <c7> 40 48 00 02 00 00 48 c7 40 40 00 00 00 00 c7 40 4c 01 00 00 > RIP [<ffffffff8072c547>] init_ISA_irqs+0x20/0x5d > RSP <ffffffff8071df38> > CR2: 0000000000000048 > ---[ end trace 4eaa2a86a8e2da22 ]--- > Kernel panic - not syncing: Attempted to kill the idle task! > Pid: 0, comm: swapper Tainted: G D 2.6.28-rc8-next-20081216-autokern1 #1 > Call Trace: > [<ffffffff80237e80>] panic+0xa0/0x160 > [<ffffffff803b6b40>] ? account+0xe2/0xf1 > [<ffffffff8024e065>] ? blocking_notifier_call_chain+0xf/0x11 > [<ffffffff8023ad07>] do_exit+0x7c/0x7a9 > [<ffffffff803b6cf1>] ? get_random_bytes+0x1b/0x1d > [<ffffffff80546456>] oops_end+0xb2/0xba > [<ffffffff80547cfb>] do_page_fault+0x738/0x7e7 > [<ffffffff80545a3f>] page_fault+0x1f/0x30 > [<ffffffff8072c547>] ? init_ISA_irqs+0x20/0x5d > [<ffffffff8072c545>] ? init_ISA_irqs+0x1e/0x5d > [<ffffffff8072c591>] native_init_IRQ+0xd/0x8a2 > [<ffffffff8073ca50>] ? rcu_init+0x9/0xb > [<ffffffff80725af2>] start_kernel+0x1a1/0x315 > [<ffffffff807252a0>] x86_64_start_reservations+0xaf/0xb3 > [<ffffffff807253a1>] x86_64_start_kernel+0xda/0xe1 > ------------[ cut here ]------------ > WARNING: at kernel/smp.c:299 smp_call_function_many+0x3a/0x215() > Hardware name: IBM eServer BladeCenter LS20 -[885055U]- > Modules linked in: > Pid: 0, comm: swapper Tainted: G D 2.6.28-rc8-next-20081216-autokern1 #1 > Call Trace: > [<ffffffff80237db2>] warn_slowpath+0xd3/0xf2 > [<ffffffff80238ada>] ? printk+0x67/0x69 > [<ffffffff807253a1>] ? x86_64_start_kernel+0xda/0xe1 > [<ffffffff8021eb4b>] ? touch_nmi_watchdog+0x65/0x69 > [<ffffffff8020f26e>] ? printk_address+0x2c/0x2e > [<ffffffff807253a1>] ? x86_64_start_kernel+0xda/0xe1 > [<ffffffff8020f453>] ? print_context_stack+0x97/0xaf > [<ffffffff8020e6b9>] ? dump_trace+0x26f/0x27e > [<ffffffff8025631c>] smp_call_function_many+0x3a/0x215 > [<ffffffff80212130>] ? stop_this_cpu+0x0/0x20 > [<ffffffff80256517>] smp_call_function+0x20/0x24 > [<ffffffff8021d4fb>] native_smp_send_stop+0x22/0x30 > [<ffffffff80237e94>] panic+0xb4/0x160 > [<ffffffff803b6b40>] ? account+0xe2/0xf1 > [<ffffffff8024e065>] ? blocking_notifier_call_chain+0xf/0x11 > [<ffffffff8023ad07>] do_exit+0x7c/0x7a9 > [<ffffffff803b6cf1>] ? get_random_bytes+0x1b/0x1d > [<ffffffff80546456>] oops_end+0xb2/0xba > [<ffffffff80547cfb>] do_page_fault+0x738/0x7e7 > [<ffffffff80545a3f>] page_fault+0x1f/0x30 > [<ffffffff8072c547>] ? init_ISA_irqs+0x20/0x5d > [<ffffffff8072c545>] ? init_ISA_irqs+0x1e/0x5d > [<ffffffff8072c591>] native_init_IRQ+0xd/0x8a2 > [<ffffffff8073ca50>] ? rcu_init+0x9/0xb > [<ffffffff80725af2>] start_kernel+0x1a1/0x315 > [<ffffffff807252a0>] x86_64_start_reservations+0xaf/0xb3 > [<ffffffff807253a1>] x86_64_start_kernel+0xda/0xe1 > ---[ end trace 4eaa2a86a8e2da22 ]--- Looks like bad luck for you, now you are hitting another bug :-( You should probably debug/post this seperately. -- Jens Axboe -- 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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