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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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