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Date: Tue, 24 Aug 2010 15:10:14 +0200 From: Johannes Berg <johannes@...solutions.net> To: Tejun Heo <tj@...nel.org> Cc: LKML <linux-kernel@...r.kernel.org> Subject: Re: workqueue destruction BUG_ON Tejun, > From 492a242b75b0abae3b1c17b4a654ab9ef67e612d Mon Sep 17 00:00:00 2001 > From: Tejun Heo <tj@...nel.org> > Date: Tue, 24 Aug 2010 14:22:47 +0200 > Subject: [PATCH] workqueue: improve destroy_workqueue() debuggability With this patch applied I still get just the BUG_ON: [ 500.874185] ------------[ cut here ]------------ [ 500.875212] kernel BUG at kernel/workqueue.c:2849! [ 500.876224] invalid opcode: 0000 [#1] PREEMPT SMP [ 500.877256] last sysfs file: /sys/module/iwlagn/refcnt [ 500.878267] CPU 1 [ 500.878281] Modules linked in: iwlagn(-) ... [ 500.880074] [ 500.880074] Pid: 2167, comm: modprobe Not tainted 2.6.36-rc1-wl-p2p-64225-g61066fb-dirty #18 JPTR/Satellite U505 [ 500.880074] RIP: 0010:[<ffffffff81078aac>] [<ffffffff81078aac>] destroy_workqueue+0x19c/0x1e0 [ 500.880074] RSP: 0018:ffff88012587fd58 EFLAGS: 00010286 [ 500.880074] RAX: 000000000000003c RBX: 0000000000000002 RCX: 000000000000005a [ 500.880074] RDX: ffff880132783d80 RSI: 0000000000000004 RDI: 00000000ffffffff [ 500.880074] RBP: ffff88012587fd68 R08: 0000000000000000 R09: 0000000000000000 [ 500.880074] R10: 0000000000000003 R11: 0000000000000000 R12: ffff880123709240 [ 500.880074] R13: ffff880133aa6240 R14: ffff880124423258 R15: 0000000000000282 [ 500.880074] FS: 00007fcf136b2700(0000) GS:ffff88002cc00000(0000) knlGS:0000000000000000 [ 500.880074] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 500.880074] CR2: 00000000006e3aa4 CR3: 00000001231fc000 CR4: 00000000000006e0 [ 500.880074] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 500.880074] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 500.880074] Process modprobe (pid: 2167, threadinfo ffff88012587e000, task ffff8801336c4780) [ 500.880074] Stack: [ 500.880074] ffff880124422840 ffff880133aa61b0 ffff88012587fda8 ffffffffa040bc30 [ 500.880074] <0> ffff88012587fd98 ffff880133aa6240 ffff880133aa6530 ffffffffa0417980 [ 500.880074] <0> ffff880133aa61b0 0000000001c014b8 ffff88012587fdd8 ffffffff812421b4 [ 500.880074] Call Trace: [ 500.880074] [<ffffffffa040bc30>] iwl_pci_remove+0x18c/0x21f [iwlagn] [ 500.880074] [<ffffffff812421b4>] pci_device_remove+0x54/0x120 [ 500.880074] [<ffffffff812d4ab5>] __device_release_driver+0x75/0xe0 [ 500.880074] [<ffffffff812d4bf8>] driver_detach+0xd8/0xe0 [ 500.880074] [<ffffffff812d3a58>] bus_remove_driver+0x88/0xe0 [ 500.880074] [<ffffffff812d5282>] driver_unregister+0x62/0xa0 [ 500.880074] [<ffffffff81242514>] pci_unregister_driver+0x44/0xc0 [ 500.880074] [<ffffffffa040ba9d>] iwl_exit+0x15/0x1c [iwlagn] [ 500.880074] [<ffffffff810a1e32>] sys_delete_module+0x1a2/0x280 [ 500.880074] [<ffffffff8100c1b2>] system_call_fastpath+0x16/0x1b [ 500.880074] Code: 19 00 39 05 77 81 81 00 7f 06 41 8b 0c 24 eb b4 83 f8 04 89 c6 77 23 41 8b 0c 24 e9 28 ff ff ff 0f 0b eb fe 31 d2 e9 43 ff ff ff <0f> 0b eb fe 0f 0b eb fe 83 f8 04 89 c6 76 dd 41 8b 04 24 e9 c6 [ 500.880074] RIP [<ffffffff81078aac>] destroy_workqueue+0x19c/0x1e0 [ 500.880074] RSP <ffff88012587fd58> [ 500.931585] ---[ end trace 06397bea564a72fe ]--- johannes -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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