Message ID | 20240927130416.188167-1-aleksandr.mikhalitsyn@canonical.com |
---|---|
Headers | show |
Series | UBUNTU: SAUCE: fan: release rcu_read_lock on skb discard path | expand |
On 9/27/24 21:04, Alexander Mikhalitsyn wrote: > BugLink: https://bugs.launchpad.net/bugs/2064176 > > SRU Justification: > > [Impact] > > User can trigger a host crash on Jammy/Noble by launching > a container which uses Ubuntu FAN network in LXD. If the patch also applies for Noble, pls update the subject with "[J/N]". Otherwise looks you missed to send patch for Noble. Guoqing
On Mon, Sep 30, 2024 at 4:18 AM Guoqing Jiang <guoqing.jiang@canonical.com> wrote: > > > > On 9/27/24 21:04, Alexander Mikhalitsyn wrote: > > BugLink: https://bugs.launchpad.net/bugs/2064176 > > > > SRU Justification: > > > > [Impact] > > > > User can trigger a host crash on Jammy/Noble by launching > > a container which uses Ubuntu FAN network in LXD. > > If the patch also applies for Noble, pls update the subject with > "[J/N]". Otherwise looks you missed > to send patch for Noble. Patch for Noble is here https://lists.ubuntu.com/archives/kernel-team/2024-September/153551.html Kind regards, Alex > > Guoqing
On 9/30/24 16:43, Aleksandr Mikhalitsyn wrote: > On Mon, Sep 30, 2024 at 4:18 AM Guoqing Jiang > <guoqing.jiang@canonical.com> wrote: >> >> >> On 9/27/24 21:04, Alexander Mikhalitsyn wrote: >>> BugLink: https://bugs.launchpad.net/bugs/2064176 >>> >>> SRU Justification: >>> >>> [Impact] >>> >>> User can trigger a host crash on Jammy/Noble by launching >>> a container which uses Ubuntu FAN network in LXD. >> If the patch also applies for Noble, pls update the subject with >> "[J/N]". Otherwise looks you missed >> to send patch for Noble. > Patch for Noble is here > https://lists.ubuntu.com/archives/kernel-team/2024-September/153551.html Thanks for the link, I'd prefer to send it within one thread, but this works too. Thanks, Guoqing
Acked-by: Guoqing Jiang <guoqing.jiang@canonical.com> On 9/27/24 21:04, Alexander Mikhalitsyn wrote: > BugLink: https://bugs.launchpad.net/bugs/2064176 > > SRU Justification: > > [Impact] > > User can trigger a host crash on Jammy/Noble by launching > a container which uses Ubuntu FAN network in LXD. > > Aug 30 21:51:57 v1 kernel: ------------[ cut here ]------------ > Aug 30 21:51:57 v1 kernel: Voluntary context switch within RCU read-side critical section! > Aug 30 21:51:57 v1 kernel: WARNING: CPU: 1 PID: 2669 at kernel/rcu/tree_plugin.h:320 rcu_note_context_switch+0x2ce/0x2f0 > Aug 30 21:51:57 v1 kernel: Modules linked in: veth vxlan ip6_udp_tunnel udp_tunnel dummy nft_masq nft_chain_nat bridge stp llc zfs(PO) spl(O) nvme_fabrics nvme_core nvme_auth ebtable_filter ebtables ip6table_raw ip6table_mangle ip6table_nat ip6table_filter ip6_tables iptable_raw iptable_mangle iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_filter nf_tables libcrc32c vhost_vsock vhost vhost_iotlb binfmt_misc kvm_amd ccp kvm irqbypass crct10dif_pclmul crc32_pclmul polyval_clmulni polyval_generic ghash_clmulni_intel sha256_ssse3 sha1_ssse3 nls_iso8859_1 joydev aesni_intel crypto_simd cryptd virtio_gpu 9pnet_virtio virtio_dma_buf xhci_pci psmouse ahci 9pnet virtiofs libahci vmw_vsock_virtio_transport xhci_pci_renesas vmw_vsock_virtio_transport_common vsock virtio_input input_leds serio_raw efi_pstore nfnetlink dmi_sysfs virtio_rng ip_tables x_tables autofs4 > Aug 30 21:51:57 v1 kernel: CPU: 1 PID: 2669 Comm: systemd-resolve Tainted: P O 6.8.0-41-generic #41-Ubuntu > Aug 30 21:51:57 v1 kernel: Hardware name: QEMU Standard PC (Q35 + ICH9, 2009)/LXD, BIOS unknown 2/2/2022 > Aug 30 21:51:57 v1 kernel: RIP: 0010:rcu_note_context_switch+0x2ce/0x2f0 > Aug 30 21:51:57 v1 kernel: Code: fe ff ff ba 02 00 00 00 be 01 00 00 00 e8 fa d0 fe ff e9 6b fe ff ff 48 c7 c7 60 7d a6 a8 c6 05 ab 99 61 02 01 e8 d2 0d f2 ff <0f> 0b e9 96 fd ff ff 0f 0b e9 36 ff ff ff 0f 0b e9 18 ff ff ff 66 > Aug 30 21:51:57 v1 kernel: RSP: 0018:ffffb611812bbd80 EFLAGS: 00010046 > Aug 30 21:51:57 v1 kernel: RAX: 0000000000000000 RBX: ffff9613faeb5a00 RCX: 0000000000000000 > Aug 30 21:51:57 v1 kernel: RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > Aug 30 21:51:57 v1 kernel: RBP: ffffb611812bbda0 R08: 0000000000000000 R09: 0000000000000000 > Aug 30 21:51:57 v1 kernel: R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > Aug 30 21:51:57 v1 kernel: R13: ffff9613b89dd200 R14: 0000000000000000 R15: 0000000000000000 > Aug 30 21:51:57 v1 kernel: FS: 00007ec3a402c5c0(0000) GS:ffff9613fae80000(0000) knlGS:0000000000000000 > Aug 30 21:51:57 v1 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > Aug 30 21:51:57 v1 kernel: CR2: 000062592dc892b8 CR3: 000000013890a000 CR4: 00000000007506f0 > Aug 30 21:51:57 v1 kernel: PKRU: 55555554 > Aug 30 21:51:57 v1 kernel: Call Trace: > Aug 30 21:51:57 v1 kernel: <TASK> > Aug 30 21:51:57 v1 kernel: ? show_regs+0x6d/0x80 > Aug 30 21:51:57 v1 kernel: ? __warn+0x89/0x160 > Aug 30 21:51:57 v1 kernel: ? rcu_note_context_switch+0x2ce/0x2f0 > Aug 30 21:51:57 v1 kernel: ? report_bug+0x17e/0x1b0 > Aug 30 21:51:57 v1 kernel: ? handle_bug+0x51/0xa0 > Aug 30 21:51:57 v1 kernel: ? exc_invalid_op+0x18/0x80 > Aug 30 21:51:57 v1 kernel: ? asm_exc_invalid_op+0x1b/0x20 > Aug 30 21:51:57 v1 kernel: ? rcu_note_context_switch+0x2ce/0x2f0 > Aug 30 21:51:57 v1 kernel: __schedule+0x81/0x6b0 > Aug 30 21:51:57 v1 kernel: schedule+0x33/0x110 > Aug 30 21:51:57 v1 kernel: syscall_exit_to_user_mode+0x22d/0x260 > Aug 30 21:51:57 v1 kernel: do_syscall_64+0x8c/0x180 > Aug 30 21:51:57 v1 kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Aug 30 21:51:57 v1 kernel: ? syscall_exit_to_user_mode+0x89/0x260 > Aug 30 21:51:57 v1 kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Aug 30 21:51:57 v1 kernel: ? do_syscall_64+0x8c/0x180 > Aug 30 21:51:57 v1 kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Aug 30 21:51:57 v1 kernel: ? irqentry_exit_to_user_mode+0x7e/0x260 > Aug 30 21:51:57 v1 kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Aug 30 21:51:57 v1 kernel: ? irqentry_exit+0x43/0x50 > Aug 30 21:51:57 v1 kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Aug 30 21:51:57 v1 kernel: ? exc_page_fault+0x94/0x1b0 > Aug 30 21:51:57 v1 kernel: entry_SYSCALL_64_after_hwframe+0x78/0x80 > Aug 30 21:51:57 v1 kernel: RIP: 0033:0x7ec3a3f14887 > Aug 30 21:51:57 v1 kernel: Code: 10 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24 > Aug 30 21:51:57 v1 kernel: RSP: 002b:00007ffcbb32de08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > Aug 30 21:51:57 v1 kernel: RAX: 000000000000002d RBX: 000062592dc882b0 RCX: 00007ec3a3f14887 > Aug 30 21:51:57 v1 kernel: RDX: 000000000000002d RSI: 000062592dc88360 RDI: 0000000000000011 > Aug 30 21:51:57 v1 kernel: RBP: 000062592dc7e690 R08: 00007ffcbb32dde4 R09: 0000000000000000 > Aug 30 21:51:57 v1 kernel: R10: 00000000000005aa R11: 0000000000000246 R12: 0000000000000011 > Aug 30 21:51:57 v1 kernel: R13: 0000000000000002 R14: 000000000000002d R15: 000062592dc88360 > Aug 30 21:51:57 v1 kernel: </TASK> > Aug 30 21:51:57 v1 kernel: ---[ end trace 0000000000000000 ]--- > > [Fix] > > A first proposed patch fixes RCU locking by releasing rcu_read_lock > on the skb discard codepath. > > Second patch just use a proper way (dev_core_stats_tx_dropped_inc() function) > to increase netdev's tx_dropped statistic value. > > [Test Plan] > > As provided by Max Asnaashari: > > # Install LXD from channel latest/stable > snap install lxd --channel latest/stable > > # Configure LXD > lxd init --auto > > # Create a FAN network > lxc network create lxdfan0 bridge.mode=fan ipv4.nat=true > > # Launch a container using the FAN network > lxc launch ubuntu-minimal:22.04 c1 --network lxdfan0 > > # Try to interact with LXD > lxc ls > > [Where problems could occur] > > Change is local and only related to Ubuntu FAN code. I would not expect > any problems with this patchset. > > Link: https://github.com/canonical/lxd/issues/14025 > Link: https://lists.ubuntu.com/archives/kernel-team/2024-September/153551.html > Reported-by: Max Asnaashari <max.asnaashari@canonical.com> > Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com> > > Alexander Mikhalitsyn (1): > UBUNTU: SAUCE: fan: release rcu_read_lock on skb discard path > > drivers/net/vxlan/vxlan_core.c | 1 + > 1 file changed, 1 insertion(+) >
BugLink: https://bugs.launchpad.net/bugs/2064176 SRU Justification: [Impact] User can trigger a host crash on Jammy/Noble by launching a container which uses Ubuntu FAN network in LXD. Aug 30 21:51:57 v1 kernel: ------------[ cut here ]------------ Aug 30 21:51:57 v1 kernel: Voluntary context switch within RCU read-side critical section! Aug 30 21:51:57 v1 kernel: WARNING: CPU: 1 PID: 2669 at kernel/rcu/tree_plugin.h:320 rcu_note_context_switch+0x2ce/0x2f0 Aug 30 21:51:57 v1 kernel: Modules linked in: veth vxlan ip6_udp_tunnel udp_tunnel dummy nft_masq nft_chain_nat bridge stp llc zfs(PO) spl(O) nvme_fabrics nvme_core nvme_auth ebtable_filter ebtables ip6table_raw ip6table_mangle ip6table_nat ip6table_filter ip6_tables iptable_raw iptable_mangle iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_filter nf_tables libcrc32c vhost_vsock vhost vhost_iotlb binfmt_misc kvm_amd ccp kvm irqbypass crct10dif_pclmul crc32_pclmul polyval_clmulni polyval_generic ghash_clmulni_intel sha256_ssse3 sha1_ssse3 nls_iso8859_1 joydev aesni_intel crypto_simd cryptd virtio_gpu 9pnet_virtio virtio_dma_buf xhci_pci psmouse ahci 9pnet virtiofs libahci vmw_vsock_virtio_transport xhci_pci_renesas vmw_vsock_virtio_transport_common vsock virtio_input input_leds serio_raw efi_pstore nfnetlink dmi_sysfs virtio_rng ip_tables x_tables autofs4 Aug 30 21:51:57 v1 kernel: CPU: 1 PID: 2669 Comm: systemd-resolve Tainted: P O 6.8.0-41-generic #41-Ubuntu Aug 30 21:51:57 v1 kernel: Hardware name: QEMU Standard PC (Q35 + ICH9, 2009)/LXD, BIOS unknown 2/2/2022 Aug 30 21:51:57 v1 kernel: RIP: 0010:rcu_note_context_switch+0x2ce/0x2f0 Aug 30 21:51:57 v1 kernel: Code: fe ff ff ba 02 00 00 00 be 01 00 00 00 e8 fa d0 fe ff e9 6b fe ff ff 48 c7 c7 60 7d a6 a8 c6 05 ab 99 61 02 01 e8 d2 0d f2 ff <0f> 0b e9 96 fd ff ff 0f 0b e9 36 ff ff ff 0f 0b e9 18 ff ff ff 66 Aug 30 21:51:57 v1 kernel: RSP: 0018:ffffb611812bbd80 EFLAGS: 00010046 Aug 30 21:51:57 v1 kernel: RAX: 0000000000000000 RBX: ffff9613faeb5a00 RCX: 0000000000000000 Aug 30 21:51:57 v1 kernel: RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 Aug 30 21:51:57 v1 kernel: RBP: ffffb611812bbda0 R08: 0000000000000000 R09: 0000000000000000 Aug 30 21:51:57 v1 kernel: R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 Aug 30 21:51:57 v1 kernel: R13: ffff9613b89dd200 R14: 0000000000000000 R15: 0000000000000000 Aug 30 21:51:57 v1 kernel: FS: 00007ec3a402c5c0(0000) GS:ffff9613fae80000(0000) knlGS:0000000000000000 Aug 30 21:51:57 v1 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Aug 30 21:51:57 v1 kernel: CR2: 000062592dc892b8 CR3: 000000013890a000 CR4: 00000000007506f0 Aug 30 21:51:57 v1 kernel: PKRU: 55555554 Aug 30 21:51:57 v1 kernel: Call Trace: Aug 30 21:51:57 v1 kernel: <TASK> Aug 30 21:51:57 v1 kernel: ? show_regs+0x6d/0x80 Aug 30 21:51:57 v1 kernel: ? __warn+0x89/0x160 Aug 30 21:51:57 v1 kernel: ? rcu_note_context_switch+0x2ce/0x2f0 Aug 30 21:51:57 v1 kernel: ? report_bug+0x17e/0x1b0 Aug 30 21:51:57 v1 kernel: ? handle_bug+0x51/0xa0 Aug 30 21:51:57 v1 kernel: ? exc_invalid_op+0x18/0x80 Aug 30 21:51:57 v1 kernel: ? asm_exc_invalid_op+0x1b/0x20 Aug 30 21:51:57 v1 kernel: ? rcu_note_context_switch+0x2ce/0x2f0 Aug 30 21:51:57 v1 kernel: __schedule+0x81/0x6b0 Aug 30 21:51:57 v1 kernel: schedule+0x33/0x110 Aug 30 21:51:57 v1 kernel: syscall_exit_to_user_mode+0x22d/0x260 Aug 30 21:51:57 v1 kernel: do_syscall_64+0x8c/0x180 Aug 30 21:51:57 v1 kernel: ? srso_alias_return_thunk+0x5/0xfbef5 Aug 30 21:51:57 v1 kernel: ? syscall_exit_to_user_mode+0x89/0x260 Aug 30 21:51:57 v1 kernel: ? srso_alias_return_thunk+0x5/0xfbef5 Aug 30 21:51:57 v1 kernel: ? do_syscall_64+0x8c/0x180 Aug 30 21:51:57 v1 kernel: ? srso_alias_return_thunk+0x5/0xfbef5 Aug 30 21:51:57 v1 kernel: ? irqentry_exit_to_user_mode+0x7e/0x260 Aug 30 21:51:57 v1 kernel: ? srso_alias_return_thunk+0x5/0xfbef5 Aug 30 21:51:57 v1 kernel: ? irqentry_exit+0x43/0x50 Aug 30 21:51:57 v1 kernel: ? srso_alias_return_thunk+0x5/0xfbef5 Aug 30 21:51:57 v1 kernel: ? exc_page_fault+0x94/0x1b0 Aug 30 21:51:57 v1 kernel: entry_SYSCALL_64_after_hwframe+0x78/0x80 Aug 30 21:51:57 v1 kernel: RIP: 0033:0x7ec3a3f14887 Aug 30 21:51:57 v1 kernel: Code: 10 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24 Aug 30 21:51:57 v1 kernel: RSP: 002b:00007ffcbb32de08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 Aug 30 21:51:57 v1 kernel: RAX: 000000000000002d RBX: 000062592dc882b0 RCX: 00007ec3a3f14887 Aug 30 21:51:57 v1 kernel: RDX: 000000000000002d RSI: 000062592dc88360 RDI: 0000000000000011 Aug 30 21:51:57 v1 kernel: RBP: 000062592dc7e690 R08: 00007ffcbb32dde4 R09: 0000000000000000 Aug 30 21:51:57 v1 kernel: R10: 00000000000005aa R11: 0000000000000246 R12: 0000000000000011 Aug 30 21:51:57 v1 kernel: R13: 0000000000000002 R14: 000000000000002d R15: 000062592dc88360 Aug 30 21:51:57 v1 kernel: </TASK> Aug 30 21:51:57 v1 kernel: ---[ end trace 0000000000000000 ]--- [Fix] A first proposed patch fixes RCU locking by releasing rcu_read_lock on the skb discard codepath. Second patch just use a proper way (dev_core_stats_tx_dropped_inc() function) to increase netdev's tx_dropped statistic value. [Test Plan] As provided by Max Asnaashari: # Install LXD from channel latest/stable snap install lxd --channel latest/stable # Configure LXD lxd init --auto # Create a FAN network lxc network create lxdfan0 bridge.mode=fan ipv4.nat=true # Launch a container using the FAN network lxc launch ubuntu-minimal:22.04 c1 --network lxdfan0 # Try to interact with LXD lxc ls [Where problems could occur] Change is local and only related to Ubuntu FAN code. I would not expect any problems with this patchset. Link: https://github.com/canonical/lxd/issues/14025 Link: https://lists.ubuntu.com/archives/kernel-team/2024-September/153551.html Reported-by: Max Asnaashari <max.asnaashari@canonical.com> Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com> Alexander Mikhalitsyn (1): UBUNTU: SAUCE: fan: release rcu_read_lock on skb discard path drivers/net/vxlan/vxlan_core.c | 1 + 1 file changed, 1 insertion(+)