REDHAT-BUG-984743

First published: Mon Jul 15 2013(Updated: )

Several people reported the oops: "kernel BUG at kernel/timer.c:729!" and the stack trace is: #7 [ffff880214d25c10] mod_timer+501 at ffffffff8106d905 #8 [ffff880214d25c50] br_multicast_del_pg.isra.20+261 at ffffffffa0731d25 [bridge] #9 [ffff880214d25c80] br_multicast_disable_port+88 at ffffffffa0732948 [bridge] #10 [ffff880214d25cb0] br_stp_disable_port+154 at ffffffffa072bcca [bridge] #11 [ffff880214d25ce8] br_device_event+520 at ffffffffa072a4e8 [bridge] #12 [ffff880214d25d18] notifier_call_chain+76 at ffffffff8164aafc #13 [ffff880214d25d50] raw_notifier_call_chain+22 at ffffffff810858f6 #14 [ffff880214d25d60] call_netdevice_notifiers+45 at ffffffff81536aad #15 [ffff880214d25d80] dev_close_many+183 at ffffffff81536d17 #16 [ffff880214d25dc0] rollback_registered_many+168 at ffffffff81537f68 #17 [ffff880214d25de8] rollback_registered+49 at ffffffff81538101 #18 [ffff880214d25e10] unregister_netdevice_queue+72 at ffffffff815390d8 #19 [ffff880214d25e30] __tun_detach+272 at ffffffffa074c2f0 [tun] #20 [ffff880214d25e88] tun_chr_close+45 at ffffffffa074c4bd [tun] #21 [ffff880214d25ea8] __fput+225 at ffffffff8119b1f1 #22 [ffff880214d25ef0] ____fput+14 at ffffffff8119b3fe #23 [ffff880214d25f00] task_work_run+159 at ffffffff8107cf7f #24 [ffff880214d25f30] do_notify_resume+97 at ffffffff810139e1 #25 [ffff880214d25f50] int_signal+18 at ffffffff8164f292 The bug was usually hit when shutting down a KVM guest. Upstream fix: <a href="http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c7e8e8a8f7a70b343ca1e0f90a31e35ab2d16de1">http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c7e8e8a8f7a70b343ca1e0f90a31e35ab2d16de1</a> Introduced by: <a href="http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9f00b2e7cf241fa389733d41b6">http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9f00b2e7cf241fa389733d41b6</a> Introduced in upstream version: v3.11-rc1 (but we had it in Fedora because of <a class="bz_bug_link bz_status_CLOSED bz_closed bz_public " title="CLOSED ERRATA - Unreliable guest to host multicast after upgrade to kernel 3.4.0-1.fc17.x86_64 and 3.6.3-1.fc17.x86_64" href="show_bug.cgi?id=880035">bz#880035</a>) References: <a class="bz_bug_link bz_status_CLOSED bz_closed bz_public " title="CLOSED ERRATA - fix for unreliable guest->host multicast triggers oops" href="show_bug.cgi?id=980254">https://bugzilla.redhat.com/show_bug.cgi?id=980254</a> <a href="http://pkgs.fedoraproject.org/cgit/kernel.git/commit/?h=f19&amp;id=a993279a9bb538ae524fca69ec23c5c1b428f47e">http://pkgs.fedoraproject.org/cgit/kernel.git/commit/?h=f19&amp;id=a993279a9bb538ae524fca69ec23c5c1b428f47e</a>

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