Messages in this thread | | | Date | Tue, 7 Apr 2009 15:32:25 +0530 | From | Maneesh Soni <> | Subject | Re: [PATCH][GIT PULL] tracing/wakeup: move access to wakeup_cpu into spinlock |
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On Thu, Apr 02, 2009 at 09:18:35AM -0400, Steven Rostedt wrote: [..] > > > > > BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 > > IP: [<ffffffff80292349>] probe_wakeup_sched_switch+0x11f/0x1e8 > > PGD 0 > > Oops: 0000 [#1] SMP > > last sysfs file: /sys/devices/pci0000:01/0000:01:01.1/irq > > CPU 3 > > 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: 16589, comm: sshd Not tainted 2.6.29-tip-test #3 eserver xSeries 366-[88632RA]- > > RIP: 0010:[<ffffffff80292349>] [<ffffffff80292349>] probe_wakeup_sched_switch+0x11f/0x1e8 > > RSP: 0018:ffff8801da1b5e90 EFLAGS: 00010046 > > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000046 > > RDX: 0000000000000000 RSI: ffffffff8020bf85 RDI: ffffffff80d6f460 > > RBP: ffff8801da1b5ed0 R08: 0000000000000000 R09: 0000000100000003 > > R10: ffff8801da1b5ed0 R11: ffff88022d152078 R12: 0000000000000046 > > R13: ffff88022f352040 R14: 0000000000000000 R15: 0000000000000003 > > FS: 00007f748364d710(0000) GS:ffff880028155000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > > CR2: 0000000000000008 CR3: 00000001cfd8e000 CR4: 00000000000006e0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: ffffffff80d91980 DR6: 00000000ffff0ff0 DR7: 0000000000000600 > > Process sshd (pid: 16589, threadinfo ffff8801da1b4000, task ffff88022d152040) > > Stack: > > ffff88022d152040 ffff88022d152040 ffff880028162960 ffff880224d79810 > > ffff880028167d00 00007fff8b6c7190 0000000000000005 00007fff8b6c7190 > > ffff8801da1b5f70 ffffffff805210b7 ffff8802295b8558 0000000000000001 > > Call Trace: > > [<ffffffff805210b7>] schedule+0x82f/0xb39 > > [<ffffffff802d95a4>] ? sys_write+0x72/0x8d > > [<ffffffff8020bf85>] sysret_careful+0xd/0x10 > > This is what I was afraid of. Your other crashes were intret_careful, > now we are hitting sysret_careful. I'm going to pull out all references to > CALLER_ADDR2. The above patch was simply me manually putting in a call > frame in intret_careful. But this is unreliable, any caller from an > interrupt (or syscall) to schedule will cause an error. I'm not sure we > need the CALLER_ADDR2 anyway. >
I had also tested with passing 0 instead of CALLER_ADDR2 and didn't see any crash.
Thanks Maneesh
-- Maneesh Soni Linux Technology Center IBM India Systems and Technology Lab, Bangalore, India.
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