[ 10.402499][ T67] ================================================================== [ 10.402791][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.403041][ T67] Read of size 8 at addr ffff88800a4c00f8 by task kworker/u16:1/67 [ 10.403258][ T67] [ 10.403339][ T67] CPU: 3 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.403580][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.403764][ T67] Workqueue: netns cleanup_net [ 10.403930][ T67] Call Trace: [ 10.404065][ T67] [ 10.404147][ T67] dump_stack_lvl+0x82/0xd0 [ 10.404300][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 10.404491][ T67] ? cleanup_net+0x932/0xa40 [ 10.404642][ T67] print_report+0xb4/0x270 [ 10.404788][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 10.404934][ T67] kasan_report+0xbd/0xf0 [ 10.405043][ T67] ? cleanup_net+0x932/0xa40 [ 10.405197][ T67] cleanup_net+0x932/0xa40 [ 10.405339][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.405487][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 10.405632][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 10.405786][ T67] ? lock_acquire+0x32/0xc0 [ 10.405934][ T67] ? process_one_work+0xe0b/0x16d0 [ 10.406087][ T67] process_one_work+0xe55/0x16d0 [ 10.406233][ T67] ? __pfx___lock_release+0x10/0x10 [ 10.406377][ T67] ? __pfx_process_one_work+0x10/0x10 [ 10.406527][ T67] ? assign_work+0x16c/0x240 [ 10.406683][ T67] worker_thread+0x58c/0xce0 [ 10.406839][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.407019][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.407165][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.407317][ T67] kthread+0x28a/0x350 [ 10.407435][ T67] ? __pfx_kthread+0x10/0x10 [ 10.407584][ T67] ret_from_fork+0x31/0x70 [ 10.407735][ T67] ? __pfx_kthread+0x10/0x10 [ 10.407885][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.408069][ T67] [ 10.408198][ T67] [ 10.408278][ T67] Allocated by task 227: [ 10.408396][ T67] kasan_save_stack+0x24/0x50 [ 10.408559][ T67] kasan_save_track+0x14/0x30 [ 10.408705][ T67] __kasan_slab_alloc+0x59/0x70 [ 10.408855][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.409004][ T67] copy_net_ns+0xc6/0x340 [ 10.409109][ T67] create_new_namespaces+0x35f/0x920 [ 10.409258][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.409400][ T67] ksys_unshare+0x2a9/0x660 [ 10.409557][ T67] __x64_sys_unshare+0x31/0x40 [ 10.409698][ T67] do_syscall_64+0xc1/0x1d0 [ 10.409843][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.410025][ T67] [ 10.410101][ T67] Freed by task 67: [ 10.410208][ T67] kasan_save_stack+0x24/0x50 [ 10.410361][ T67] kasan_save_track+0x14/0x30 [ 10.410507][ T67] kasan_save_free_info+0x3b/0x60 [ 10.410658][ T67] __kasan_slab_free+0x38/0x50 [ 10.410803][ T67] kmem_cache_free+0xf8/0x330 [ 10.410947][ T67] cleanup_net+0x5a8/0xa40 [ 10.411090][ T67] process_one_work+0xe55/0x16d0 [ 10.411230][ T67] worker_thread+0x58c/0xce0 [ 10.411368][ T67] kthread+0x28a/0x350 [ 10.411478][ T67] ret_from_fork+0x31/0x70 [ 10.411630][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.411771][ T67] [ 10.411849][ T67] The buggy address belongs to the object at ffff88800a4c0040 [ 10.411849][ T67] which belongs to the cache net_namespace of size 5696 [ 10.412231][ T67] The buggy address is located 184 bytes inside of [ 10.412231][ T67] freed 5696-byte region [ffff88800a4c0040, ffff88800a4c1680) [ 10.412566][ T67] [ 10.412647][ T67] The buggy address belongs to the physical page: [ 10.412827][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800a4c2fc0 pfn:0xa4c0 [ 10.413112][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.413327][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.413509][ T67] page_type: f5(slab) [ 10.413625][ T67] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.413879][ T67] raw: ffff88800a4c2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.414152][ T67] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.414417][ T67] head: ffff88800a4c2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.414682][ T67] head: 0080000000000003 ffffea0000293001 ffffffffffffffff 0000000000000000 [ 10.414955][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.415222][ T67] page dumped because: kasan: bad access detected [ 10.415404][ T67] [ 10.415476][ T67] Memory state around the buggy address: [ 10.415629][ T67] ffff88800a4bff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 10.415842][ T67] ffff88800a4c0000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.416073][ T67] >ffff88800a4c0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.416286][ T67] ^ [ 10.416487][ T67] ffff88800a4c0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.416691][ T67] ffff88800a4c0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.416911][ T67] ================================================================== [ 10.417161][ T67] Disabling lock debugging due to kernel taint [ 11.236375][ T227] icmps-discard_i (227) used greatest stack depth: 23664 bytes left