Re: [crash] BUG: unable to handle kernel NULL pointer dereferenceat 0000000000000370

From: Larry Finger
Date: Tue Jul 22 2008 - 08:52:41 EST

David Miller wrote:
From: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
Date: Tue, 22 Jul 2008 01:34:28 -0500

David Miller wrote:
From: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
Date: Mon, 21 Jul 2008 17:40:10 -0500

Sorry :(

I used the davem patch, the second version of your first one, and your second one. Both problems persist.

Still plugging away on bisection.
GIT bisecting the lockdep problem is surely going the land you on:

commit e308a5d806c852f56590ffdd3834d0df0cbed8d7
No. It landed on this one.

For the lockdep warnings?

No - this one triggers the kernel BUG as follows:

------------[ cut here ]------------
kernel BUG at net/core/dev.c:1328!
invalid opcode: 0000 [1] SMP
Modules linked in: af_packet rfkill_input nfs lockd nfs_acl sunrpc cpufreq_conservative cpufreq_userspace cpufreq_powersave powernow_k8 fuse loop dm_mod arc4 ecb crypto_blkcipher b43 firmware_class rfkill mac80211 cfg80211 led_class input_polldev k8temp sr_mod battery ac ssb button hwmon forcedeth cdrom serio_raw sg ohci_hcd ehci_hcd sd_mod usbcore edd fan thermal processor ext3 mbcache jbd pata_amd ahci libata scsi_mod dock
Pid: 2003, comm: b43 Not tainted 2.6.26-rc8-Linus-git-01424-g37437bb #43
RIP: 0010:[<ffffffff803958c6>] [<ffffffff803958c6>] __netif_schedule+0x12/0x75
RSP: 0018:ffff8100b9e33de0 EFLAGS: 00010246
RAX: ffff8100b63819c0 RBX: ffffffff80545300 RCX: ffff8100b6381980
RDX: 00000000ffffffff RSI: 0000000000000001 RDI: ffffffff80545300
RBP: ffff8100b7b45158 R08: ffff8100b89d8000 R09: ffff8100b9d26000
R10: ffff8100b7b44480 R11: ffffffffa01239ef R12: ffff8100b7b44480
R13: ffff8100b9d26000 R14: ffff8100b89d8000 R15: 0000000000000000
FS: 00007f494406a6f0(0000) GS:ffffffff8055e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 00007f49440933dc CR3: 0000000000201000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process b43 (pid: 2003, threadinfo ffff8100b9e32000, task ffff8100b4a3e480)
Stack: ffff8100b7b45158 ffff8100b89d8900 ffff8100b7b45158 ffffffffa0158455
ffff8100ba3287c0 0000000000000246 0000000000000000 0000000000000000
ffff8100b9e33e70 ffff8100b7b451b8 ffff8100ba3287c0 ffff8100b7b451b0
Call Trace:
[<ffffffffa0158455>] ? :mac80211:ieee80211_scan_completed+0x25b/0x2e1
[<ffffffffa01586d6>] ? :mac80211:ieee80211_sta_scan_work+0x0/0x1b8
[<ffffffff8023f7d7>] ? run_workqueue+0xf1/0x1f3
[<ffffffff8023f9b4>] ? worker_thread+0xdb/0xea
[<ffffffff80243017>] ? autoremove_wake_function+0x0/0x2e
[<ffffffff8023f8d9>] ? worker_thread+0x0/0xea
[<ffffffff80242cff>] ? kthread+0x47/0x73
[<ffffffff80402845>] ? trace_hardirqs_on_thunk+0x35/0x3a
[<ffffffff8020cd48>] ? child_rip+0xa/0x12
[<ffffffff8020c45f>] ? restore_args+0x0/0x30
[<ffffffff8021d3b6>] ? flat_send_IPI_mask+0x0/0x67
[<ffffffff80242c93>] ? kthreadd+0x188/0x1ad
[<ffffffff80242c93>] ? kthreadd+0x188/0x1ad
[<ffffffff80242cb8>] ? kthread+0x0/0x73
[<ffffffff8020cd3e>] ? child_rip+0x0/0x12

Code: 00 00 75 0a 55 9d 5e 5b 5d e9 32 64 eb ff e8 21 73 eb ff 55 9d 59 5b 5d c3 55 53 48 89 fb 48 83 ec 08 48 81 ff 00 53 54 80 75 04 <0f> 0b eb fe 48 8d 47 30 f0 0f ba 28 01 19 d2 85 d2 75 4c 9c 5d
RIP [<ffffffff803958c6>] __netif_schedule+0x12/0x75
RSP <ffff8100b9e33de0>
---[ end trace 396dc6bdf73da468 ]---

I'll have to trace back to see which of the bisections produced both the lockdep and the kernel bug.


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