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Date: Mon, 26 Aug 2013 08:06:37 +0200 From: Johannes Berg <johannes@...solutions.net> To: Pravin Shelar <pshelar@...ira.com> Cc: netdev <netdev@...r.kernel.org>, Jesse Gross <jesse@...ira.com> Subject: Re: [PATCH 1/2] genl: Fix genl dumpit() locking. On Fri, 2013-08-23 at 13:52 -0700, Pravin Shelar wrote: > > I'm still missing something. Kernel 3.4 had cb_mutex assign to the > > genl_mutex, but we saw the original crash there, apparently dumpit > > *wasn't* (always) locked with it? > Can you point me to original crash on 3.4? Sure, below. johannes [1389854.965295] cfg80211: Calling CRDA to update world regulatory domain [1389854.973801] Intel(R) Wireless WiFi driver for Linux, in-tree:d [1389854.973804] Copyright(c) 2003-2013 Intel Corporation [1389854.982900] cfg80211: World regulatory domain updated: [1389854.982908] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp) [1389854.982913] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) [1389854.982919] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm) [1389854.982923] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm) [1389854.982928] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) [1389854.982932] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) [1389857.247719] BUG: unable to handle kernel paging request at f8467360 [1389857.249716] IP: [<c14c56bb>] ctrl_dumpfamily+0x6b/0xe0 [1389857.251798] *pde = 2ffd7067 *pte = 00000000 [1389857.253903] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC [1389857.256002] Modules linked in: cfg80211(O) ... [1389857.265729] [1389857.268159] Pid: 20081, comm: wpa_supplicant Tainted: G W O 3.4.47-dev #1 Dell Inc. Latitude E6430/0CPWYR [1389857.270726] EIP: 0060:[<c14c56bb>] EFLAGS: 00210297 CPU: 2 [1389857.273291] EIP is at ctrl_dumpfamily+0x6b/0xe0 [1389857.275829] EAX: f8467378 EBX: f8467340 ECX: 00000000 EDX: ec1610c4 [1389857.278365] ESI: 00000001 EDI: c2077cc0 EBP: c46c3c00 ESP: c46c3bd4 [1389857.280921] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [1389857.283508] CR0: 80050033 CR2: f8467360 CR3: 26e54000 CR4: 001407d0 [1389857.286130] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [1389857.288770] DR6: ffff0ff0 DR7: 00000400 [1389857.291363] Process wpa_supplicant (pid: 20081, ti=c46c2000 task=c44640b0 task.ti=c46c2000) [1389857.294044] Stack: [1389857.296668] 00000002 caef8000 00000001 caef8000 00000000 e6ccc3c0 c1861f00 00000000 [1389857.299377] e73cd910 e6ccc3c0 caef8000 c46c3c28 c14c20bc 000000d0 00200246 00200246 [1389857.302077] e73cd910 e6ccc3c0 e73cd910 e6ccc3c0 00000000 c46c3c48 c14c3450 d0757b00 [1389857.304794] Call Trace: [1389857.307443] [<c14c20bc>] netlink_dump+0x5c/0x200 [1389857.310110] [<c14c3450>] __netlink_dump_start+0x140/0x160 [1389857.312779] [<c14c5650>] ? ctrl_fill_info+0x370/0x370 [1389857.315442] [<c14c5172>] genl_rcv_msg+0x102/0x270 [1389857.318096] [<c14c5034>] ? genl_lock+0x14/0x20 [1389857.320765] [<c15acdb2>] ? mutex_lock_nested+0x222/0x2f0 [1389857.323424] [<c15acdc2>] ? mutex_lock_nested+0x232/0x2f0 [1389857.326026] [<c14c5034>] ? genl_lock+0x14/0x20 [1389857.328621] [<c14c5650>] ? ctrl_fill_info+0x370/0x370 [1389857.331224] [<c14c5070>] ? genl_rcv+0x30/0x30 [1389857.333822] [<c14c4b5e>] netlink_rcv_skb+0x8e/0xb0 [1389857.336420] [<c14c505c>] genl_rcv+0x1c/0x30 [1389857.339014] [<c14c456b>] netlink_unicast+0x17b/0x1c0 [1389857.341617] [<c14c47d4>] netlink_sendmsg+0x224/0x370 [1389857.344215] [<c1485adf>] sock_sendmsg+0xff/0x120 [1389857.346812] [<c112ad04>] ? might_fault+0x54/0xb0 [1389857.349403] [<c112ad4e>] ? might_fault+0x9e/0xb0 [1389857.351982] [<c12de3c2>] ? _copy_from_user+0x42/0x60 [1389857.354558] [<c14926e4>] ? verify_iovec+0x44/0xb0 [1389857.357086] [<c1486b0a>] __sys_sendmsg+0x24a/0x260 [1389857.359563] [<c12e39de>] ? do_raw_spin_unlock+0x4e/0x90 [1389857.362025] [<c110af35>] ? unlock_page+0x45/0x50 [1389857.364443] [<c112aff8>] ? __do_fault+0x298/0x450 [1389857.366858] [<c112db01>] ? handle_pte_fault+0xe1/0x7d0 [1389857.369178] [<c15b3b8b>] ? do_page_fault+0xcb/0x4b0 [1389857.371403] [<c1150b45>] ? fget_light+0x1d5/0x470 [1389857.373618] [<c1487fdb>] sys_sendmsg+0x3b/0x60 [1389857.375827] [<c1488683>] sys_socketcall+0x283/0x2e0 [1389857.377946] [<c15b072d>] ? restore_all+0xf/0xf [1389857.379981] [<c15b3ac0>] ? vmalloc_fault+0x114/0x114 [1389857.381927] [<c12ddea8>] ? trace_hardirqs_on_thunk+0xc/0x10 [1389857.383796] [<c15b7c1f>] sysenter_do_call+0x12/0x38 [1389857.385644] Code: 8d 3c c5 c0 7c 07 c2 8b 04 c5 c0 7c 07 c2 39 c7 8d 58 c8 75 16 eb 71 90 81 7d ec 00 1f 86 c1 74 10 8b 43 38 39 c7 8d 58 c8 74 5d <80> 7b 20 00 74 e7 83 c6 01 3b 75 f0 7c e8 8b 55 e8 8b 42 04 8b [1389857.389897] EIP: [<c14c56bb>] ctrl_dumpfamily+0x6b/0xe0 SS:ESP 0068:c46c3bd4 [1389857.391949] CR2: 00000000f8467360 [1389857.496970] ---[ end trace 52efe903d218886a ]--- [1389857.496977] BUG: sleeping function called from invalid context at kernel/rwsem.c:20 [1389857.496982] in_atomic(): 0, irqs_disabled(): 1, pid: 20081, name: wpa_supplicant [1389857.496986] INFO: lockdep is turned off. [1389857.496989] irq event stamp: 0 [1389857.496992] hardirqs last enabled at (0): [< (null)>] (null) [1389857.496997] hardirqs last disabled at (0): [<c1031aa8>] copy_process+0x468/0x1280 [1389857.497006] softirqs last enabled at (0): [<c1031aa8>] copy_process+0x468/0x1280 [1389857.497012] softirqs last disabled at (0): [< (null)>] (null) [1389857.497019] Pid: 20081, comm: wpa_supplicant Tainted: G D W O 3.4.47-dev #1 [1389857.497022] Call Trace: [1389857.497031] [<c1067322>] __might_sleep+0x162/0x200 [1389857.497038] [<c15add80>] down_read+0x20/0x8b [1389857.497046] [<c1049f5e>] exit_signals+0x1e/0x110 [1389857.497053] [<c10381b7>] do_exit+0x97/0x9b0 [1389857.497059] [<c1035753>] ? kmsg_dump+0x193/0x270 [1389857.497065] [<c1035630>] ? kmsg_dump+0x70/0x270 [1389857.497073] [<c15a60e2>] ? printk+0x2d/0x2f [1389857.497079] [<c15b1646>] oops_end+0x96/0xd0 [1389857.497086] [<c15a5aac>] no_context+0x18c/0x194 [1389857.497098] [<c15a5bf8>] __bad_area_nosemaphore+0x144/0x14c [1389857.497106] [<c10960bb>] ? trace_hardirqs_on+0xb/0x10 [1389857.497114] [<c148c7cf>] ? sock_rmalloc+0x3f/0x90 [1389857.497122] [<c15b3ac0>] ? vmalloc_fault+0x114/0x114 [1389857.497128] [<c15a5c17>] bad_area_nosemaphore+0x17/0x19 [1389857.497135] [<c15b3d9f>] do_page_fault+0x2df/0x4b0 [1389857.497141] [<c14c2049>] ? __nlmsg_put+0x59/0x70 [1389857.497149] [<c12ec362>] ? __nla_reserve+0x42/0x60 [1389857.497154] [<c15b0e54>] ? error_code+0x68/0x74 [1389857.497160] [<c15b3ac0>] ? vmalloc_fault+0x114/0x114 [1389857.497167] [<c1093adf>] ? trace_hardirqs_off_caller+0x1f/0x130 [1389857.497176] [<c15b3ac0>] ? vmalloc_fault+0x114/0x114 [1389857.497181] [<c15b0e58>] error_code+0x6c/0x74 [1389857.497191] [<c14c56bb>] ? ctrl_dumpfamily+0x6b/0xe0 [1389857.497197] [<c14c20bc>] netlink_dump+0x5c/0x200 [1389857.497204] [<c14c3450>] __netlink_dump_start+0x140/0x160 [1389857.497210] [<c14c5650>] ? ctrl_fill_info+0x370/0x370 [1389857.497216] [<c14c5172>] genl_rcv_msg+0x102/0x270 [1389857.497222] [<c14c5034>] ? genl_lock+0x14/0x20 [1389857.497229] [<c15acdb2>] ? mutex_lock_nested+0x222/0x2f0 [1389857.497236] [<c15acdc2>] ? mutex_lock_nested+0x232/0x2f0 [1389857.497242] [<c14c5034>] ? genl_lock+0x14/0x20 [1389857.497248] [<c14c5650>] ? ctrl_fill_info+0x370/0x370 [1389857.497254] [<c14c5070>] ? genl_rcv+0x30/0x30 [1389857.497260] [<c14c4b5e>] netlink_rcv_skb+0x8e/0xb0 [1389857.497267] [<c14c505c>] genl_rcv+0x1c/0x30 [1389857.497273] [<c14c456b>] netlink_unicast+0x17b/0x1c0 [1389857.497279] [<c14c47d4>] netlink_sendmsg+0x224/0x370 [1389857.497286] [<c1485adf>] sock_sendmsg+0xff/0x120 [1389857.497294] [<c112ad04>] ? might_fault+0x54/0xb0 [1389857.497301] [<c112ad4e>] ? might_fault+0x9e/0xb0 [1389857.497308] [<c12de3c2>] ? _copy_from_user+0x42/0x60 [1389857.497313] [<c14926e4>] ? verify_iovec+0x44/0xb0 [1389857.497320] [<c1486b0a>] __sys_sendmsg+0x24a/0x260 [1389857.497326] [<c12e39de>] ? do_raw_spin_unlock+0x4e/0x90 [1389857.497333] [<c110af35>] ? unlock_page+0x45/0x50 [1389857.497340] [<c112aff8>] ? __do_fault+0x298/0x450 [1389857.497346] [<c112db01>] ? handle_pte_fault+0xe1/0x7d0 [1389857.497353] [<c15b3b8b>] ? do_page_fault+0xcb/0x4b0 [1389857.497359] [<c1150b45>] ? fget_light+0x1d5/0x470 [1389857.497366] [<c1487fdb>] sys_sendmsg+0x3b/0x60 [1389857.497372] [<c1488683>] sys_socketcall+0x283/0x2e0 [1389857.497378] [<c15b072d>] ? restore_all+0xf/0xf [1389857.497384] [<c15b3ac0>] ? vmalloc_fault+0x114/0x114 [1389857.497391] [<c12ddea8>] ? trace_hardirqs_on_thunk+0xc/0x10 [1389857.497397] [<c15b7c1f>] sysenter_do_call+0x12/0x38 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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