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Date: Thu, 26 Mar 2009 09:49:56 -0400 (EDT) From: Steven Rostedt <rostedt@...dmis.org> To: Frederic Weisbecker <fweisbec@...il.com> cc: Maneesh Soni <maneesh@...ibm.com>, linux-kernel@...r.kernel.org, mingo@...e.hu Subject: Re: [-tip] ftrace: oops at probe_wakeup_sched_switch+0xd1/0x1ae On Thu, 26 Mar 2009, Frederic Weisbecker wrote: > On Thu, Mar 26, 2009 at 05:58:07PM +0530, Maneesh Soni wrote: > > > > I hit the below oops while playing with "wakeup" tracer. Just enabled > > tracing and ran "while true; do cat trace; done" on a 8-way systems with > > -tip at commit 9e25bacc221318a29d37425e054c01047edad7f5. > > > > > > Attached the .config. > > > > Thanks > > Maneesh > > > > BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 > > IP: [<ffffffff802d2258>] probe_wakeup_sched_switch+0xd1/0x1ae > > PGD 219147067 PUD 1e449e067 PMD 0 > > Oops: 0000 [#1] SMP > > last sysfs file: /sys/devices/pci0000:0c/0000:0c:00.0/irq > > CPU 5 > > Modules linked in: autofs4 hidp rfcomm l2cap bluetooth iptable_filter ip_tables ip6t_REJECT xt_tcpudp ip6table_filter ip6_tables x_tables ipv6 dm_mirror dm_region_hash dm_log dm_multipath scsi_dh dm_mod sbs sbshc battery ac parport_pc lp parport sg sr_mod ide_cd_mod cdrom serio_raw acpi_memhotplug button tg3 libphy i2c_piix4 i2c_core pcspkr usb_storage uhci_hcd ohci_hcd ehci_hcd aacraid sd_mod scsi_mod ext3 jbd > > Pid: 5937, comm: cat Not tainted 2.6.29-tip-test #1 eserver xSeries 366-[88632RA]- > > RIP: 0010:[<ffffffff802d2258>] [<ffffffff802d2258>] probe_wakeup_sched_switch+0xd1/0x1ae > > RSP: 0000:ffff8801cf4cdea0 EFLAGS: 00010046 > > RAX: 0000000000000000 RBX: ffff88022f232820 RCX: 0000000000000046 > > RDX: ffff8800281989a0 RSI: ffffffff8020d56d RDI: ffffffff811de480 > > RBP: ffff8801cf4cded0 R08: 0000000000000000 R09: 0000000000000000 > > R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000046 > > R13: 0000000000000000 R14: ffff8801e4471820 R15: 0000000000000005 > > FS: 00007f607411c6e0(0000) GS:ffff88002818b000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > > CR2: 0000000000000008 CR3: 00000001da19a000 CR4: 00000000000006e0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > > Process cat (pid: 5937, threadinfo ffff8801cf4cc000, task ffff8801e4471820) > > Stack: > > ffff8800281989a0 ffff8802191e14b0 ffff88002819dd40 00007fff7c130640 > > 0000000000000000 ffff88002819dd40 ffff8801cf4cdf70 ffffffff806f8264 > > 0000000000000002 ffff8801cf4cdf48 ffff8801e4471820 ffff88022f232820 > > Call Trace: > > [<ffffffff806f8264>] schedule+0xd99/0x10f9 > > [<ffffffff806fb61b>] ? trace_hardirqs_on_thunk+0x3a/0x3c > > [<ffffffff8020d56d>] retint_careful+0x12/0x2e > > Code: f2 83 3d 1b b0 9f 00 00 74 77 48 3b 1d a2 de f2 00 75 6e 48 8b 4d 00 48 8b 3d 8d de f2 00 45 89 e8 48 8b 01 48 8b 71 08 4c 89 e1 <48> 8b 50 08 e8 f7 9f ff ff 48 8b 3d 70 de f2 00 45 89 e8 48 89 > > RIP [<ffffffff802d2258>] probe_wakeup_sched_switch+0xd1/0x1ae > > RSP <ffff8801cf4cdea0> > > CR2: 0000000000000008 > > ---[ end trace ab11daa90bb147ba ]--- > > > > > > I've tested the same config and ran your script with wakeup tracer but nothing > weird happened. > Though I've tested on UP so may be I should try on SMP. Yeah, that may make a difference ;-) -- Steve -- 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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