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SubjectRe: Lockdep warning and kernel panic with e1000e on 2.6.33-rc4
Okay, it turned out that this was a regression in the AMD IOMMU driver :-(
I fixed it and now the issue disappeared. Sorry for the noise.

Joerg

On Fri, Jan 22, 2010 at 02:24:32PM +0100, Joerg Roedel wrote:
> Hi,
>
> I just tried to unbind a device from the e1000e driver and got the following
> output from lockdep and the kernel panic from a NULL pointer dereference. The
> kernel running on the machine is 2.6.33-rc4 + kvm patches (which shouldn't
> matter):
>
> [ 157.282671] =============================================
> [ 157.283400] [ INFO: possible recursive locking detected ]
> [ 157.283400] 2.6.33-rc4 #76
> [ 157.283400] ---------------------------------------------
> [ 157.283400] bash/3686 is trying to acquire lock:
> [ 157.283400] (s_active){++++.+}, at: [<ffffffff811543f8>] sysfs_hash_and_remove+0x53/0x6a
> [ 157.283400]
> [ 157.283400] but task is already holding lock:
> [ 157.283400] (s_active){++++.+}, at: [<ffffffff811563fd>] sysfs_get_active_two+0x24/0x4b
> [ 157.283400]
> [ 157.283400] other info that might help us debug this:
> [ 157.283400] 3 locks held by bash/3686:
> [ 157.283400] #0: (&buffer->mutex){+.+.+.}, at: [<ffffffff81154d4d>] sysfs_write_file+0x3e/0x12b
> [ 157.283400] #1: (s_active){++++.+}, at: [<ffffffff811563fd>] sysfs_get_active_two+0x24/0x4b
> [ 157.283400] #2: (s_active){++++.+}, at: [<ffffffff8115640a>] sysfs_get_active_two+0x31/0x4b
> [ 157.283400]
> [ 157.283400] stack backtrace:
> [ 157.283400] Pid: 3686, comm: bash Not tainted 2.6.33-rc4 #76
> [ 157.283400] Call Trace:
> [ 157.283400] [<ffffffff81071576>] __lock_acquire+0xcf1/0xd86
> [ 157.283400] [<ffffffff8106ff39>] ? debug_check_no_locks_freed+0x120/0x12f
> [ 157.283400] [<ffffffff8106faff>] ? trace_hardirqs_on_caller+0x11f/0x14a
> [ 157.283400] [<ffffffff810716cf>] lock_acquire+0xc4/0xe1
> [ 157.283400] [<ffffffff811543f8>] ? sysfs_hash_and_remove+0x53/0x6a
> [ 157.283400] [<ffffffff8115612a>] sysfs_addrm_finish+0xcd/0x135
> [ 157.283400] [<ffffffff811543f8>] ? sysfs_hash_and_remove+0x53/0x6a
> [ 157.283400] [<ffffffff8165ec51>] ? __mutex_lock_common+0x324/0x335
> [ 157.283400] [<ffffffff8165ed20>] ? mutex_lock_nested+0x3c/0x41
> [ 157.283400] [<ffffffff811543f8>] sysfs_hash_and_remove+0x53/0x6a
> [ 157.283400] [<ffffffff811565eb>] sysfs_remove_link+0x21/0x23
> [ 157.283400] [<ffffffff8135209f>] __device_release_driver+0x2d/0xce
> [ 157.283400] [<ffffffff81352215>] device_release_driver+0x23/0x30
> [ 157.283400] [<ffffffff81351a7e>] driver_unbind+0x5c/0x9e
> [ 157.283400] [<ffffffff81350f36>] drv_attr_store+0x2c/0x2e
> [ 157.283400] [<ffffffff81154e05>] sysfs_write_file+0xf6/0x12b
> [ 157.283400] [<ffffffff810fe635>] vfs_write+0xb0/0x10a
> [ 157.283400] [<ffffffff810fe75d>] sys_write+0x4c/0x75
> [ 157.283400] [<ffffffff81002c1b>] system_call_fastpath+0x16/0x1b
> [ 157.506592] e1000e 0000:02:00.0: PCI INT A disabled
> [ 157.511796] BUG: unable to handle kernel NULL pointer dereference at 0000000000000024
> [ 157.512464] IP: [<ffffffff81212b7c>] do_raw_spin_unlock+0xc/0x8b
> [ 157.512464] PGD 835651067 PUD 835a98067 PMD 0
> [ 157.512464] Oops: 0000 [#1] SMP
> [ 157.512464] last sysfs file: /sys/bus/pci/drivers/e1000e/unbind
> [ 157.512464] CPU 19
> [ 157.512464] Pid: 3686, comm: bash Not tainted 2.6.33-rc4 #76 Dinar/Dinar
> [ 157.512464] RIP: 0010:[<ffffffff81212b7c>] [<ffffffff81212b7c>] do_raw_spin_unlock+0xc/0x8b
> [ 157.512464] RSP: 0018:ffff88043675dcf8 EFLAGS: 00010092
> [ 157.512464] RAX: ffff880435116540 RBX: 0000000000000020 RCX: 0000000000000000
> [ 157.512464] RDX: ffffffff81023c47 RSI: 0000000000000001 RDI: 0000000000000020
> [ 157.512464] RBP: ffff88043675dd08 R08: 0000000000000086 R09: 0000000000000000
> [ 157.512464] R10: ffff88043675ddc8 R11: ffff88043675dd08 R12: 0000000000000082
> [ 157.512464] R13: 0000000000000082 R14: 0000000000000282 R15: 0000000000000005
> [ 157.512464] FS: 00007f5ddd27f6f0(0000) GS:ffff88063f440000(0000) knlGS:0000000000000000
> [ 157.512464] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 157.512464] CR2: 0000000000000024 CR3: 0000000835601000 CR4: 00000000000006e0
> [ 157.512464] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 157.512464] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [ 157.512464] Process bash (pid: 3686, threadinfo ffff88043675c000, task ffff880435116540)
> [ 157.512464] Stack:
> [ 157.512464] 0000000000000282 0000000000000020 ffff88043675dd28 ffffffff816600ab
> [ 157.512464] <0> ffff880c35829600 ffff8808365dd088 ffff88043675dd58 ffffffff81023c47
> [ 157.512464] <0> 0000000000000005 ffff8808365dd088 0000000000000200 ffff880c359e75c0
> [ 157.512464] Call Trace:
> [ 157.512464] [<ffffffff816600ab>] _raw_spin_unlock_irqrestore+0x2c/0x4c
> [ 157.512464] [<ffffffff81023c47>] detach_device+0x90/0xc7
> [ 157.512464] [<ffffffff81025687>] device_change_notifier+0x8e/0x127
> [ 157.512464] [<ffffffff81662dda>] notifier_call_chain+0x38/0x60
> [ 157.512464] [<ffffffff81063aba>] __blocking_notifier_call_chain+0x52/0x6f
> [ 157.512464] [<ffffffff81063aeb>] blocking_notifier_call_chain+0x14/0x16
> [ 157.512464] [<ffffffff8135213b>] __device_release_driver+0xc9/0xce
> [ 157.512464] [<ffffffff81352215>] device_release_driver+0x23/0x30
> [ 157.512464] [<ffffffff81351a7e>] driver_unbind+0x5c/0x9e
> [ 157.512464] [<ffffffff81350f36>] drv_attr_store+0x2c/0x2e
> [ 157.512464] [<ffffffff81154e05>] sysfs_write_file+0xf6/0x12b
> [ 157.512464] [<ffffffff810fe635>] vfs_write+0xb0/0x10a
> [ 157.512464] [<ffffffff810fe75d>] sys_write+0x4c/0x75
> [ 157.512464] [<ffffffff81002c1b>] system_call_fastpath+0x16/0x1b
> [ 157.512464] Code: c0 4c 89 e6 48 c7 c7 9e 2a ac 81 31 c0 e8 c8 a7 44 00 e8 d8 a5 44 00 5f 5b 41 5c 41 5d c9 c3 55 48 89 e5 53 48 89 fb 48 83 ec 08 <81> 7f 04 ad 4e ad de 74 0c 48 c7 c6 4a 2a ac 81 e8 35 ff ff ff
> [ 157.512464] RIP [<ffffffff81212b7c>] do_raw_spin_unlock+0xc/0x8b
> [ 157.512464] RSP <ffff88043675dcf8>
> [ 157.512464] CR2: 0000000000000024
> [ 157.512464] ---[ end trace a773b332cbda2d29 ]---
>
> lspci of the affected card looks as follows:
>
> evelt:~# lspci -n -vv -s 02:00.0
> 02:00.0 0200: 8086:10d3
> Subsystem: 8086:a01f
> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
> Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
> Latency: 0, Cache Line Size: 64 bytes
> Interrupt: pin A routed to IRQ 32
> Region 0: Memory at ce020000 (32-bit, non-prefetchable) [size=128K]
> Region 1: Memory at ce080000 (32-bit, non-prefetchable) [size=512K]
> Region 2: I/O ports at 3000 [size=32]
> Region 3: Memory at ce000000 (32-bit, non-prefetchable) [size=16K]
> [virtual] Expansion ROM at c8200000 [disabled] [size=256K]
> Capabilities: [c8] Power Management version 2
> Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
> Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=1 PME-
> Capabilities: [d0] MSI: Enable- Count=1/1 Maskable- 64bit+
> Address: 0000000000000000 Data: 0000
> Capabilities: [e0] Express (v1) Endpoint, MSI 00
> DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <512ns, L1 <64us
> ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
> DevCtl: Report errors: Correctable+ Non-Fatal+ Fatal+ Unsupported+
> RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
> MaxPayload 128 bytes, MaxReadReq 512 bytes
> DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr+ TransPend-
> LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 <128ns, L1 <64us
> ClockPM- Surprise- LLActRep- BwNot-
> LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
> ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
> LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
> Capabilities: [a0] MSI-X: Enable+ Count=5 Masked-
> Vector table: BAR=3 offset=00000000
> PBA: BAR=3 offset=00002000
> Capabilities: [100] Advanced Error Reporting
> UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
> UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
> UESvrt: DLP+ SDES- TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
> CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
> CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
> AERCap: First Error Pointer: 00, GenCap- CGenEn- ChkCap- ChkEn-
> Capabilities: [140] Device Serial Number 00-1b-21-ff-ff-46-60-4a
> Kernel driver in use: e1000e
>
> Please let me know if you need more information.
>
> Joerg
>
>
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