[ 11.710552][ T66] ================================================================== [ 11.710818][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 11.711041][ T66] Read of size 8 at addr ffff88800b4580f8 by task kworker/u16:1/66 [ 11.711254][ T66] [ 11.711323][ T66] CPU: 3 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 11.711542][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 11.711730][ T66] Workqueue: netns cleanup_net [ 11.711885][ T66] Call Trace: [ 11.712007][ T66] [ 11.712083][ T66] dump_stack_lvl+0x82/0xd0 [ 11.712244][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 11.712437][ T66] ? cleanup_net+0x932/0xa40 [ 11.712583][ T66] print_report+0xb4/0x270 [ 11.712736][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 11.712875][ T66] kasan_report+0xbd/0xf0 [ 11.712981][ T66] ? cleanup_net+0x932/0xa40 [ 11.713122][ T66] cleanup_net+0x932/0xa40 [ 11.713262][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 11.713407][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 11.713556][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 11.713697][ T66] ? lock_acquire+0x32/0xc0 [ 11.713839][ T66] ? process_one_work+0xe0b/0x16d0 [ 11.713980][ T66] process_one_work+0xe55/0x16d0 [ 11.714120][ T66] ? __pfx___lock_release+0x10/0x10 [ 11.714260][ T66] ? __pfx_process_one_work+0x10/0x10 [ 11.714403][ T66] ? assign_work+0x16c/0x240 [ 11.714544][ T66] worker_thread+0x58c/0xce0 [ 11.714681][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 11.714854][ T66] ? __pfx_worker_thread+0x10/0x10 [ 11.715004][ T66] ? __pfx_worker_thread+0x10/0x10 [ 11.715139][ T66] kthread+0x28a/0x350 [ 11.715251][ T66] ? __pfx_kthread+0x10/0x10 [ 11.715392][ T66] ret_from_fork+0x31/0x70 [ 11.715537][ T66] ? __pfx_kthread+0x10/0x10 [ 11.715676][ T66] ret_from_fork_asm+0x1a/0x30 [ 11.715828][ T66] [ 11.715934][ T66] [ 11.716007][ T66] Allocated by task 228: [ 11.716141][ T66] kasan_save_stack+0x24/0x50 [ 11.716282][ T66] kasan_save_track+0x14/0x30 [ 11.716422][ T66] __kasan_slab_alloc+0x59/0x70 [ 11.716564][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 11.716711][ T66] copy_net_ns+0xc6/0x340 [ 11.716815][ T66] create_new_namespaces+0x35f/0x920 [ 11.716955][ T66] unshare_nsproxy_namespaces+0x8d/0x130 [ 11.717092][ T66] ksys_unshare+0x2a9/0x660 [ 11.717232][ T66] __x64_sys_unshare+0x31/0x40 [ 11.717368][ T66] do_syscall_64+0xc1/0x1d0 [ 11.717509][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 11.717697][ T66] [ 11.717770][ T66] Freed by task 66: [ 11.717873][ T66] kasan_save_stack+0x24/0x50 [ 11.718010][ T66] kasan_save_track+0x14/0x30 [ 11.718148][ T66] kasan_save_free_info+0x3b/0x60 [ 11.718296][ T66] __kasan_slab_free+0x38/0x50 [ 11.718452][ T66] kmem_cache_free+0xf8/0x330 [ 11.718602][ T66] cleanup_net+0x5a8/0xa40 [ 11.718745][ T66] process_one_work+0xe55/0x16d0 [ 11.718889][ T66] worker_thread+0x58c/0xce0 [ 11.719021][ T66] kthread+0x28a/0x350 [ 11.719123][ T66] ret_from_fork+0x31/0x70 [ 11.719257][ T66] ret_from_fork_asm+0x1a/0x30 [ 11.719393][ T66] [ 11.719493][ T66] The buggy address belongs to the object at ffff88800b458040 [ 11.719493][ T66] which belongs to the cache net_namespace of size 5696 [ 11.719855][ T66] The buggy address is located 184 bytes inside of [ 11.719855][ T66] freed 5696-byte region [ffff88800b458040, ffff88800b459680) [ 11.720211][ T66] [ 11.720279][ T66] The buggy address belongs to the physical page: [ 11.720482][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800b45afc0 pfn:0xb458 [ 11.720733][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 11.720930][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 11.721097][ T66] page_type: f5(slab) [ 11.721197][ T66] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.721419][ T66] raw: ffff88800b45afc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.721637][ T66] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.721856][ T66] head: ffff88800b45afc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.722078][ T66] head: 0080000000000003 ffffea00002d1601 ffffffffffffffff 0000000000000000 [ 11.722309][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 11.722520][ T66] page dumped because: kasan: bad access detected [ 11.722674][ T66] [ 11.722736][ T66] Memory state around the buggy address: [ 11.722855][ T66] ffff88800b457f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.723079][ T66] ffff88800b458000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 11.723275][ T66] >ffff88800b458080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.723469][ T66] ^ [ 11.723662][ T66] ffff88800b458100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.723852][ T66] ffff88800b458180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.724064][ T66] ================================================================== [ 11.724313][ T66] Disabling lock debugging due to kernel taint