** Description changed: + BugLink: https://bugs.launchpad.net/bugs/2120803 + [Impact] - TODO + Microsoft has reported that the following upstream commit: + + 4c262801ea60 ("hv_netvsc: Fix VF namespace also in synthetic NIC + NETDEV_REGISTER event") + + introduced a race condition in the hv_netvsc driver that can lead to a + null pointer dereference and subsequent kernel panic during a namespace + change: + + [ 231.449420] mana 7870:00:00.0 enP30832s1: Moved VF to namespace with: eth0 + [ 231.449656] BUG: kernel NULL pointer dereference, address: 0000000000000010 + [ 231.450246] #PF: supervisor read access in kernel mode + [ 231.450579] #PF: error_code(0x0000) - not-present page + [ 231.450916] PGD 17b8a8067 P4D 0 + [ 231.451163] Oops: Oops: 0000 [#1] SMP NOPTI + [ 231.451450] CPU: 82 UID: 0 PID: 1394 Comm: kworker/u768:1 Not tainted 6.16.0-rc4+ #3 VOLUNTARY + [ 231.452042] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 11/21/2024 + [ 231.452692] Workqueue: netns cleanup_net + [ 231.452947] RIP: 0010:default_device_exit_batch+0x16c/0x3f0 + [ 231.453326] Code: c0 0c f5 b3 e8 d5 db fe ff 48 85 c0 74 15 48 c7 c2 f8 fd ca b2 be 10 00 00 00 48 8d 7d c0 e8 7b 77 25 00 49 8b 86 28 01 00 00 <48> 8b 50 10 4c 8b 2a 4c 8d 62 f0 49 83 ed 10 4c 39 e0 0f 84 d6 00 + [ 231.454294] RSP: 0018:ff75fc7c9bf9fd00 EFLAGS: 00010246 + [ 231.454610] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 61c8864680b583eb + [ 231.455094] RDX: ff1fa9f71462d800 RSI: ff75fc7c9bf9fd38 RDI: 0000000030766564 + [ 231.455686] RBP: ff75fc7c9bf9fd78 R08: 0000000000000000 R09: 0000000000000000 + [ 231.456126] R10: 0000000000000001 R11: 0000000000000004 R12: ff1fa9f70088e340 + [ 231.456621] R13: ff1fa9f70088e340 R14: ffffffffb3f50c20 R15: ff1fa9f7103e6340 + [ 231.457161] FS: 0000000000000000(0000) GS:ff1faa6783a08000(0000) knlGS:0000000000000000 + [ 231.457707] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 + [ 231.458031] CR2: 0000000000000010 CR3: 0000000179ab2006 CR4: 0000000000b73ef0 + [ 231.458434] Call Trace: + [ 231.458600] <TASK> + [ 231.458777] ops_undo_list+0x100/0x220 + [ 231.459015] cleanup_net+0x1b8/0x300 + [ 231.459285] process_one_work+0x184/0x340 [Fix] - TODO + Backport the following upstream fix commit: + + 33caa208dba6 ("hv_netvsc: Fix panic during namespace deletion with VF") + + to the linux-azure trees for all affected releases. + + - Plucky, Noble, Jammy: clean cherry-picks + - Focal: simple backport due to a context conflict [Test plan] - TODO + Compile-tested only; Microsoft will perform further validation. [Where problems could occur] - TODO + Any issues here could lead to hangs or crashes during namespace change + operations for NICs within Hyper-V (particularly MANA NICs). [Other info] SF #00416493
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2120803 Title: azure: backport "hv_netvsc: Fix panic during namespace deletion with VF" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/2120803/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
