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Message-ID: <AAEA33E297BCAC4B9BB20A7C2DF0AB8D15B30910@FMSMSX107.amr.corp.intel.com> Date: Mon, 18 Jun 2012 20:45:56 +0000 From: "Williams, Mitch A" <mitch.a.williams@...el.com> To: David Ahern <daahern@...co.com> CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: RE: divide by 0 error in igbvf_set_coalesce - ab50a2a > -----Original Message----- > From: David Ahern [mailto:daahern@...co.com] > Sent: Monday, June 18, 2012 11:16 AM > To: Williams, Mitch A > 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 [ Thanks for letting me know, David. I'll look into it and get a patch out soon. Shouldn't be that big of a deal to fix. In the meantime, my advice to you is, "Don't do that." -Mitch > 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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