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Message-ID: <4FDF706D.7080509@cisco.com> Date: Mon, 18 Jun 2012 12:16:13 -0600 From: David Ahern <daahern@...co.com> To: mitch.a.williams@...el.com CC: netdev@...r.kernel.org Subject: divide by 0 error in igbvf_set_coalesce - ab50a2a Mitch: I have a VM using a 82576 based VF. Running: $ ethtool -C eth2 rx-usecs 0 generates the following trace on console: [ 894.683322] divide error: 0000 [#1] SMP [ 894.684020] CPU 1 [ 894.684020] Modules linked in: sunrpc virtio_net igbvf virtio_blk virtio_pci virtio_ring virtio [ 894.684020] [ 894.684020] Pid: 7310, comm: ethtool Not tainted 3.5.0-rc1 #0 Bochs Bochs [ 894.684020] RIP: 0010:[<ffffffffa00259ec>] [<ffffffffa00259ec>] igbvf_set_coalesce+0x5b/0x8b [igbvf] [ 894.684020] RSP: 0018:ffff88003cd51c38 EFLAGS: 00010246 [ 894.684020] RAX: 000000003b9aca00 RBX: ffff88003aa42000 RCX: 0000000000000000 [ 894.684020] RDX: 0000000000000000 RSI: ffff88003cd51c48 RDI: ffff88003aa42780 [ 894.684020] RBP: ffff88003cd51c38 R08: 0000000000000000 R09: 0000000000000000 [ 894.684020] R10: 0000000000000000 R11: ffff88003cd51ec8 R12: ffff88003cd51c48 [ 894.684020] R13: 000000000000000f R14: 00000000ffffffff R15: 00000000fffffff2 [ 894.684020] FS: 00007f8142ccb720(0000) GS:ffff88003fd00000(0000) knlGS:0000000000000000 [ 894.684020] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 894.684020] CR2: 000000000040466c CR3: 000000003c754000 CR4: 00000000000007e0 [ 894.684020] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 894.684020] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 894.684020] Process ethtool (pid: 7310, threadinfo ffff88003cd50000, task ffff88003b984470) [ 894.684020] Stack: [ 894.684020] ffff88003cd51cb8 ffffffff8132bcf5 000000000000000f 0000000000000000 [ 894.684020] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 894.684020] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 894.684020] Call Trace: [ 894.684020] [<ffffffff8132bcf5>] ethtool_set_coalesce+0x54/0x5d [ 894.684020] [<ffffffff8132d0c9>] dev_ethtool+0x5dc/0x175b [ 894.684020] [<ffffffff81057921>] ? need_resched+0x1e/0x28 [ 894.684020] [<ffffffff81057934>] ? should_resched+0x9/0x29 [ 894.684020] [<ffffffff813be822>] ? _cond_resched+0xe/0x22 [ 894.684020] [<ffffffff8132b227>] dev_ioctl+0x517/0x684 [ 894.684020] [<ffffffff810ec91f>] ? pmd_offset+0x14/0x3b [ 894.684020] [<ffffffff81315045>] sock_do_ioctl+0x3d/0x48 [ 894.684020] [<ffffffff8131545f>] sock_ioctl+0x1f8/0x207 [ 894.684020] [<ffffffff8111f6fa>] do_vfs_ioctl+0x475/0x4b6 [ 894.684020] [<ffffffff811f8e70>] ? inode_has_perm.clone.19.clone.27+0x33/0x35 [ 894.684020] [<ffffffff811f9298>] ? file_has_perm+0x73/0x7e [ 894.684020] [<ffffffff8110f6cf>] ? fd_install+0x57/0x60 [ 894.684020] [<ffffffff8111f791>] sys_ioctl+0x56/0x79 [ 894.684020] [<ffffffff813c5de9>] system_call_fastpath+0x16/0x1b [ 894.684020] Code: 83 f8 02 77 0f c7 87 0c 03 00 00 e8 01 00 00 8b 46 04 eb 19 8d 04 8d 00 00 00 00 31 d2 89 87 0c 03 00 00 c1 e1 0a b8 00 ca 9a 3b <f7> f1 89 87 08 03 00 00 8b 97 0c 03 00 00 48 8b 87 80 03 00 00 [ 894.684020] RIP [<ffffffffa00259ec>] igbvf_set_coalesce+0x5b/0x8b [igbvf] [ 894.684020] RSP <ffff88003cd51c38> [ 894.779474] ---[ end trace 162bed6b66df758d ]--- This commit introduced the problem: commit ab50a2a430693b0961dc7b7d9fe2a4bd77d11ea6 Author: Mitch A Williams <mitch.a.williams@...el.com> Date: Sat Jan 14 08:10:50 2012 +0000 igbvf: refactor Interrupt Throttle Rate code David -- 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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