[ 11.825310][ T67] ================================================================== [ 11.825678][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 11.825990][ T67] Read of size 8 at addr ffff88800b2900f8 by task kworker/u16:1/67 [ 11.826257][ T67] [ 11.826358][ T67] CPU: 0 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 11.826658][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 11.826923][ T67] Workqueue: netns cleanup_net [ 11.827155][ T67] Call Trace: [ 11.827307][ T67] [ 11.827413][ T67] dump_stack_lvl+0x82/0xd0 [ 11.827642][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 11.827919][ T67] ? cleanup_net+0x932/0xa40 [ 11.828111][ T67] print_report+0xb4/0x270 [ 11.828287][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 11.828465][ T67] kasan_report+0xbd/0xf0 [ 11.828607][ T67] ? cleanup_net+0x932/0xa40 [ 11.828790][ T67] cleanup_net+0x932/0xa40 [ 11.828969][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 11.829157][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 11.829349][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 11.829543][ T67] ? lock_acquire+0x32/0xc0 [ 11.829741][ T67] ? process_one_work+0xe0b/0x16d0 [ 11.829928][ T67] process_one_work+0xe55/0x16d0 [ 11.830114][ T67] ? __pfx___lock_release+0x10/0x10 [ 11.830289][ T67] ? __pfx_process_one_work+0x10/0x10 [ 11.830483][ T67] ? assign_work+0x16c/0x240 [ 11.830699][ T67] worker_thread+0x58c/0xce0 [ 11.830905][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 11.831164][ T67] ? __pfx_worker_thread+0x10/0x10 [ 11.831369][ T67] ? __pfx_worker_thread+0x10/0x10 [ 11.831592][ T67] kthread+0x28a/0x350 [ 11.831750][ T67] ? __pfx_kthread+0x10/0x10 [ 11.831961][ T67] ret_from_fork+0x31/0x70 [ 11.832170][ T67] ? __pfx_kthread+0x10/0x10 [ 11.832375][ T67] ret_from_fork_asm+0x1a/0x30 [ 11.832588][ T67] [ 11.832744][ T67] [ 11.832847][ T67] Allocated by task 226: [ 11.833019][ T67] kasan_save_stack+0x24/0x50 [ 11.833177][ T67] kasan_save_track+0x14/0x30 [ 11.833318][ T67] __kasan_slab_alloc+0x59/0x70 [ 11.833453][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 11.833597][ T67] copy_net_ns+0xc6/0x340 [ 11.833699][ T67] create_new_namespaces+0x35f/0x920 [ 11.833844][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 11.834030][ T67] ksys_unshare+0x2a9/0x660 [ 11.834169][ T67] __x64_sys_unshare+0x31/0x40 [ 11.834302][ T67] do_syscall_64+0xc1/0x1d0 [ 11.834432][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 11.834617][ T67] [ 11.834681][ T67] Freed by task 67: [ 11.834775][ T67] kasan_save_stack+0x24/0x50 [ 11.834947][ T67] kasan_save_track+0x14/0x30 [ 11.835130][ T67] kasan_save_free_info+0x3b/0x60 [ 11.835305][ T67] __kasan_slab_free+0x38/0x50 [ 11.835490][ T67] kmem_cache_free+0xf8/0x330 [ 11.835705][ T67] cleanup_net+0x5a8/0xa40 [ 11.835909][ T67] process_one_work+0xe55/0x16d0 [ 11.836101][ T67] worker_thread+0x58c/0xce0 [ 11.836288][ T67] kthread+0x28a/0x350 [ 11.836429][ T67] ret_from_fork+0x31/0x70 [ 11.836624][ T67] ret_from_fork_asm+0x1a/0x30 [ 11.836816][ T67] [ 11.836925][ T67] The buggy address belongs to the object at ffff88800b290040 [ 11.836925][ T67] which belongs to the cache net_namespace of size 5696 [ 11.837427][ T67] The buggy address is located 184 bytes inside of [ 11.837427][ T67] freed 5696-byte region [ffff88800b290040, ffff88800b291680) [ 11.837994][ T67] [ 11.838096][ T67] The buggy address belongs to the physical page: [ 11.838333][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800b292fc0 pfn:0xb290 [ 11.838755][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 11.839046][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 11.839303][ T67] page_type: f5(slab) [ 11.839475][ T67] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.839842][ T67] raw: ffff88800b292fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.840186][ T67] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.840512][ T67] head: ffff88800b292fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.840899][ T67] head: 0080000000000003 ffffea00002ca401 ffffffffffffffff 0000000000000000 [ 11.841260][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 11.841638][ T67] page dumped because: kasan: bad access detected [ 11.841892][ T67] [ 11.841994][ T67] Memory state around the buggy address: [ 11.842202][ T67] ffff88800b28ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 11.842473][ T67] ffff88800b290000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 11.842736][ T67] >ffff88800b290080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.843029][ T67] ^ [ 11.843296][ T67] ffff88800b290100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.843554][ T67] ffff88800b290180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.843830][ T67] ================================================================== [ 11.844140][ T67] Disabling lock debugging due to kernel taint