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Bug 675072 - kernel 4.19.8: Undefined behaviour in net/core/dev.c:9475:2
Summary: kernel 4.19.8: Undefined behaviour in net/core/dev.c:9475:2
Status: RESOLVED UPSTREAM
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: AMD64 Linux
: Normal normal (vote)
Assignee: Gentoo Kernel Bug Wranglers and Kernel Maintainers
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-01-10 10:38 UTC by segmentation fault
Modified: 2019-06-11 11:46 UTC (History)
0 users

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Package list:
Runtime testing required: ---

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Description segmentation fault 2019-01-10 10:38:39 UTC 
Various 'undefined behaviour' messages for net/core/dev.c:

kernel: ================================================================================
kernel: UBSAN: Undefined behaviour in net/core/dev.c:9475:2
kernel: member access within misaligned address 00000000c464e914 for type 'struct net_device'
kernel: which requires 64 byte alignment
kernel: CPU: 4 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: default_device_exit+0x13b/0x1a0
kernel: ? dev_change_net_namespace+0xa50/0xa50
kernel: ops_exit_list+0x52/0x110
kernel: cleanup_net+0x293/0x640
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: ================================================================================


 ================================================================================
kernel: UBSAN: Undefined behaviour in net/core/dev.c:7941:2
kernel: member access within misaligned address 00000000ed2239aa for type 'struct net_device'
kernel: which requires 64 byte alignment
kernel: CPU: 4 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: rollback_registered_many+0x8b6/0xb80
kernel: ? printk+0x4d/0x69
kernel: ? __rtnl_unlock+0x22/0x60
kernel: ? netdev_run_todo+0xa9/0x630
kernel: unregister_netdevice_many+0x48/0x2d0
kernel: default_device_exit_batch+0x1cc/0x2f0
kernel: ? init_wait_entry+0xe0/0xe0
kernel: cleanup_net+0x293/0x640
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: ================================================================================


 ================================================================================
kernel: UBSAN: Undefined behaviour in net/core/dev.c:1495:2
kernel: member access within misaligned address 00000000578e8c1d for type 'struct net_device'
kernel: which requires 64 byte alignment
kernel: CPU: 4 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: dev_close_many+0x3ab/0x3f0
kernel: rollback_registered_many+0x21d/0xb80
kernel: ? printk+0x4d/0x69
kernel: ? __rtnl_unlock+0x22/0x60
kernel: ? netdev_run_todo+0xa9/0x630
kernel: unregister_netdevice_many+0x48/0x2d0
kernel: default_device_exit_batch+0x1cc/0x2f0
kernel: ? init_wait_entry+0xe0/0xe0
kernel: cleanup_net+0x293/0x640
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: ================================================================================


 ================================================================================
kernel: UBSAN: Undefined behaviour in net/core/dev.c:1501:2
kernel: member access within misaligned address 00000000578e8c1d for type 'struct net_device'
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: dev_close_many+0x2fb/0x3f0
kernel: rollback_registered_many+0x21d/0xb80
kernel: ? printk+0x4d/0x69
kernel: ? __rtnl_unlock+0x22/0x60
kernel: ? netdev_run_todo+0xa9/0x630
kernel: unregister_netdevice_many+0x48/0x2d0
kernel: default_device_exit_batch+0x1cc/0x2f0
kernel: ? init_wait_entry+0xe0/0xe0
kernel: cleanup_net+0x293/0x640
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
Comment 1 Mike Pagano gentoo-dev 2019-06-11 11:46:34 UTC 
Detection of undefined behavior via the UndefinedBehaviorSanitizer can be reported upstream at https://bugzilla.kernel.org