From dmesg: [49842.288770] ================================================================================ [49842.288773] UBSAN: Undefined behaviour in net/unix/garbage.c:301:2 [49842.288775] member access within misaligned address 00000000ad237f88 for type 'struct unix_sock' [49842.288776] which requires 64 byte alignment [49842.288779] CPU: 3 PID: 9668 Comm: FS Broker 9666 Tainted: P O T 4.19.8-gentoo #4 [49842.288780] Hardware name: ASUSTeK COMPUTER INC. G752VY/G752VY, BIOS G752VY.304 06/29/2017 [49842.288780] Call Trace: [49842.288789] dump_stack+0xa1/0x11b [49842.288792] ubsan_epilogue+0x9/0x40 [49842.288794] ubsan_type_mismatch_common+0x17b/0x190 [49842.288797] __ubsan_handle_type_mismatch+0x43/0x60 [49842.288800] unix_gc+0x944/0xc40 [49842.288803] unix_release_sock+0x2e1/0x660 [49842.288807] ? __sock_release+0x210/0x210 [49842.288809] unix_release+0x19/0x50 [49842.288810] __sock_release+0x6d/0x210 [49842.288813] sock_close+0xc/0x10 [49842.288816] __fput+0x163/0x5d0 [49842.288819] task_work_run+0xa1/0x140 [49842.288822] exit_to_usermode_loop+0x131/0x170 [49842.288824] do_syscall_64+0x1b2/0x280 [49842.288827] entry_SYSCALL_64_after_hwframe+0x49/0xbe [49842.288829] RIP: 0033:0x7f6d7b9866ee [49842.288831] Code: 33 34 25 28 00 00 00 75 69 48 83 c4 28 c3 66 0f 1f 44 00 00 89 7c 24 0c e8 cf fa ff ff 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 2d 89 d7 89 44 24 0c e8 0f fb ff ff 8b 44 24 [49842.288833] RSP: 002b:00007f6d38cf8be0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [49842.288835] RAX: 0000000000000000 RBX: 00000000000000a2 RCX: 00007f6d7b9866ee [49842.288836] RDX: 0000000000000000 RSI: 00007f6d38cf8b90 RDI: 000000000000009d [49842.288837] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000020 [49842.288838] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000010 [49842.288839] R13: 00007f6d38cfae90 R14: 00007f6d38cfbea0 R15: 00007f6d40ba96f0 [49842.288841] ================================================================================ 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
Detection of undefined behavior via the UndefinedBehaviorSanitizer can be reported upstream at https://bugzilla.kernel.org
