This occurred probably during loading of the r8169 module, as an "undefined behaviour" message occurred for drivers/net/ethernet/realtek/r8169.c:6803:21 immediately thereafter. ================================================================================ kernel: UBSAN: Undefined behaviour in net/core/net_namespace.c:565:2 kernel: member access within misaligned address 0000000083513e50 for type 'struct net' kernel: which requires 64 byte alignment kernel: CPU: 5 PID: 8745 Comm: kworker/u16:0 Tainted: P O T 4.19.8-gentoo #1 kernel: Hardware name: ASUSTeK COMPUTER INC. G752VY/G752VY, BIOS G752VY.304 06/29/2017 kernel: Workqueue: netns cleanup_net kernel: Call Trace: kernel: dump_stack+0xa1/0x11b kernel: ubsan_epilogue+0x9/0x40 kernel: ubsan_type_mismatch_common+0x17b/0x190 kernel: __ubsan_handle_type_mismatch+0x43/0x60 kernel: cleanup_net+0x47c/0x640 kernel: ? _raw_spin_unlock_irq+0xa/0x20 kernel: process_one_work+0x3a3/0xd70 kernel: worker_thread+0xba/0xd90 kernel: ? __schedule+0x4b6/0x1740 kernel: ? process_one_work+0xd70/0xd70 kernel: ? process_one_work+0xd70/0xd70 kernel: kthread+0x170/0x230 kernel: ? kthread_create_worker_on_cpu+0x70/0x70 kernel: ret_from_fork+0x3a/0x50 kernel: ================================================================================ System info: Portage 2.3.51 (python 3.6.5-final-0, hardened/linux/amd64, gcc-7.3.0, glibc-2.27-r6, 4.19.8-gentoo x86_64) ================================================================= System uname: Linux-4.19.8-gentoo-x86_64-Intel-R-_Core-TM-_i7-6700HQ_CPU_@_2.60GHz-with-gentoo-2.6 KiB Mem: 40976340 total, 16220132 free KiB Swap: 0 total, 0 free Timestamp of repository gentoo: Thu, 13 Dec 2018 12:15:01 +0000 Head commit of repository gentoo: 057645ffcdb86bd24e7c965f6e1aa03db33abb4c sh bash 4.4_p12 ld GNU ld (Gentoo 2.30 p5) 2.30.0 app-shells/bash: 4.4_p12::gentoo dev-java/java-config: 2.2.0-r4::gentoo dev-lang/perl: 5.26.2::gentoo dev-lang/python: 2.7.15::gentoo, 3.4.8::gentoo, 3.5.5::gentoo, 3.6.5::gentoo dev-util/cmake: 3.12.3::gentoo dev-util/pkgconfig: 0.29.2::gentoo sys-apps/baselayout: 2.6-r1::gentoo sys-apps/openrc: 0.38.3-r1::gentoo sys-apps/sandbox: 2.13::gentoo sys-devel/autoconf: 2.13::gentoo, 2.69-r4::gentoo sys-devel/automake: 1.11.6-r3::gentoo, 1.12.6::gentoo, 1.13.4-r2::gentoo, 1.14.1::gentoo, 1.15.1-r2::gentoo sys-devel/binutils: 2.30-r4::gentoo sys-devel/gcc: 7.3.0-r3::gentoo sys-devel/gcc-config: 1.8-r1::gentoo sys-devel/libtool: 2.4.6-r3::gentoo sys-devel/make: 4.2.1-r4::gentoo sys-kernel/linux-headers: 4.13::gentoo (virtual/os-headers) sys-libs/glibc: 2.27-r6::gentoo
Immediately after the above, I got: kernel: Generic PHY r8169-400:00: attached PHY driver [Generic PHY] (mii_bus:phy_addr=r8169-400:00, irq=IGNORE) ================================================================================ kernel: UBSAN: Undefined behaviour in drivers/net/ethernet/realtek/r8169.c:6803:21 kernel: member access within misaligned address 00000000592e1bd8 for type 'struct rtnl_link_stats64' kernel: which requires 8 byte alignment kernel: CPU: 6 PID: 9054 Comm: ip Tainted: P O T 4.19.8-gentoo #1 kernel: Hardware name: ASUSTeK COMPUTER INC. G752VY/G752VY, BIOS G752VY.304 06/29/2017 kernel: Call Trace: kernel: dump_stack+0xa1/0x11b kernel: ubsan_epilogue+0x9/0x40 kernel: ubsan_type_mismatch_common+0x17b/0x190 kernel: __ubsan_handle_type_mismatch+0x43/0x60 kernel: rtl8169_get_stats64+0x899/0x960 [r8169] kernel: dev_get_stats+0x189/0x280 kernel: rtnl_fill_stats+0x3f/0x860 kernel: rtnl_fill_ifinfo+0x8d6/0x2880 kernel: ? __kmalloc_track_caller+0x236/0x5d0 kernel: ? __alloc_skb+0x8a/0x230 kernel: ? __kmalloc_reserve.isra.16+0x24/0x70 kernel: rtmsg_ifinfo_build_skb+0xa8/0x170 kernel: rtmsg_ifinfo_event.part.14+0x16/0x90 kernel: rtmsg_ifinfo+0x34/0x60 kernel: __dev_notify_flags+0x129/0x1c0 kernel: ? dev_change_flags+0x6b/0xe0 kernel: dev_change_flags+0x6b/0xe0 kernel: do_setlink+0x41e/0x2430 kernel: ? nla_parse+0x4f/0x2b0 kernel: rtnl_newlink+0x6b8/0x10b0 kernel: ? get_page_from_freelist+0x1899/0x3690 kernel: ? get_page_from_freelist+0x1809/0x3690 kernel: ? mem_cgroup_commit_charge+0xba/0xeb0 kernel: ? mem_cgroup_try_charge+0xfb/0x500 kernel: ? page_add_new_anon_rmap+0xb6/0x190 kernel: ? _raw_spin_unlock+0x5/0x10 kernel: ? do_anonymous_page+0x3a7/0x630 kernel: ? rtnl_link_unregister+0x170/0x170 kernel: rtnetlink_rcv_msg+0x445/0x780 kernel: ? rtnl_calcit+0x230/0x230 kernel: netlink_rcv_skb+0x9b/0x2e0 kernel: netlink_unicast+0x25d/0x440 kernel: netlink_sendmsg+0x3f1/0x8a0 kernel: ? copy_msghdr_from_user+0xdb/0x140 kernel: ___sys_sendmsg+0x360/0x710 kernel: ? __dentry_kill+0x2d1/0x610 kernel: ? __sys_sendmsg+0x76/0xe0 kernel: __sys_sendmsg+0x76/0xe0 kernel: do_syscall_64+0x85/0x280 kernel: entry_SYSCALL_64_after_hwframe+0x49/0xbe kernel: RIP: 0033:0x7f0d138cfa48 kernel: Code: 40 00 48 83 ec 38 64 48 8b 04 25 28 00 00 00 48 89 44 24 28 31 c0 48 8d 05 dd 1d 2c 00 8b 00 85 c0 75 27 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 60 48 8b 4c 24 28 64 48 33 0c 25 28 00 00 00 kernel: RSP: 002b:00007ffc9e64dbf0 EFLAGS: 00000246 ORIG_RAX: 000000000000002e kernel: RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f0d138cfa48 kernel: RDX: 0000000000000000 RSI: 00007ffc9e64dc90 RDI: 0000000000000003 kernel: RBP: 0000000000000001 R08: 0000000000000010 R09: 0000000000000000 kernel: R10: 0000000000000000 R11: 0000000000000246 R12: 000000005c34cb98 kernel: R13: 00007ffc9e64e480 R14: 00005590f3377020 R15: 0000000000000000 kernel: ================================================================================ I will file an extra bug report for the UBSAN messages regarding drivers/net/ethernet/realtek/r8169.c Stay tuned... :-)
Here is the promised bug report for r8169.c: https://bugs.gentoo.org/675078
Detection of undefined behavior via the UndefinedBehaviorSanitizer can be reported upstream at https://bugzilla.kernel.org
