[ 12.094845][ T11] ================================================================== [ 12.095183][ T11] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 12.095395][ T11] Read of size 8 at addr ffff888004e380f8 by task kworker/u16:0/11 [ 12.095635][ T11] [ 12.095713][ T11] CPU: 0 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.12.0-virtme #1 [ 12.095943][ T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 12.096109][ T11] Workqueue: netns cleanup_net [ 12.096296][ T11] Call Trace: [ 12.096399][ T11] [ 12.096486][ T11] dump_stack_lvl+0x82/0xd0 [ 12.096625][ T11] print_address_description.constprop.0+0x2c/0x3b0 [ 12.096816][ T11] ? cleanup_net+0x932/0xa40 [ 12.096957][ T11] print_report+0xb4/0x270 [ 12.097084][ T11] ? kasan_addr_to_slab+0x25/0x80 [ 12.097241][ T11] kasan_report+0xbd/0xf0 [ 12.097360][ T11] ? cleanup_net+0x932/0xa40 [ 12.097503][ T11] cleanup_net+0x932/0xa40 [ 12.097645][ T11] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 12.097787][ T11] ? __pfx_cleanup_net+0x10/0x10 [ 12.097945][ T11] ? trace_lock_acquire+0x148/0x1f0 [ 12.098109][ T11] ? lock_acquire+0x32/0xc0 [ 12.098249][ T11] ? process_one_work+0xe0b/0x16d0 [ 12.098400][ T11] process_one_work+0xe55/0x16d0 [ 12.098536][ T11] ? __pfx___lock_release+0x10/0x10 [ 12.098670][ T11] ? __pfx_process_one_work+0x10/0x10 [ 12.098825][ T11] ? assign_work+0x16c/0x240 [ 12.098979][ T11] worker_thread+0x58c/0xce0 [ 12.099133][ T11] ? __pfx_worker_thread+0x10/0x10 [ 12.099303][ T11] kthread+0x28a/0x350 [ 12.099438][ T11] ? __pfx_kthread+0x10/0x10 [ 12.099597][ T11] ret_from_fork+0x31/0x70 [ 12.099772][ T11] ? __pfx_kthread+0x10/0x10 [ 12.099927][ T11] ret_from_fork_asm+0x1a/0x30 [ 12.100097][ T11] [ 12.100239][ T11] [ 12.100324][ T11] Allocated by task 228: [ 12.100424][ T11] kasan_save_stack+0x24/0x50 [ 12.100580][ T11] kasan_save_track+0x14/0x30 [ 12.100740][ T11] __kasan_slab_alloc+0x59/0x70 [ 12.100887][ T11] kmem_cache_alloc_noprof+0x10b/0x350 [ 12.101030][ T11] copy_net_ns+0xc6/0x340 [ 12.101143][ T11] create_new_namespaces+0x35f/0x920 [ 12.101309][ T11] unshare_nsproxy_namespaces+0x8d/0x130 [ 12.101450][ T11] ksys_unshare+0x2a9/0x660 [ 12.101599][ T11] __x64_sys_unshare+0x31/0x40 [ 12.101746][ T11] do_syscall_64+0xc1/0x1d0 [ 12.101877][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.102045][ T11] [ 12.102112][ T11] Freed by task 11: [ 12.102218][ T11] kasan_save_stack+0x24/0x50 [ 12.102363][ T11] kasan_save_track+0x14/0x30 [ 12.102501][ T11] kasan_save_free_info+0x3b/0x60 [ 12.102630][ T11] __kasan_slab_free+0x38/0x50 [ 12.102757][ T11] kmem_cache_free+0xf8/0x330 [ 12.102891][ T11] cleanup_net+0x5a8/0xa40 [ 12.103035][ T11] process_one_work+0xe55/0x16d0 [ 12.103170][ T11] worker_thread+0x58c/0xce0 [ 12.103316][ T11] kthread+0x28a/0x350 [ 12.103417][ T11] ret_from_fork+0x31/0x70 [ 12.103547][ T11] ret_from_fork_asm+0x1a/0x30 [ 12.103674][ T11] [ 12.103740][ T11] The buggy address belongs to the object at ffff888004e38040 [ 12.103740][ T11] which belongs to the cache net_namespace of size 5696 [ 12.104069][ T11] The buggy address is located 184 bytes inside of [ 12.104069][ T11] freed 5696-byte region [ffff888004e38040, ffff888004e39680) [ 12.104387][ T11] [ 12.104453][ T11] The buggy address belongs to the physical page: [ 12.104604][ T11] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888004e3afc0 pfn:0x4e38 [ 12.104865][ T11] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 12.105063][ T11] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 12.105226][ T11] page_type: f5(slab) [ 12.105328][ T11] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 12.105561][ T11] raw: ffff888004e3afc0 0000000000050002 00000001f5000000 0000000000000000 [ 12.105792][ T11] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 12.106021][ T11] head: ffff888004e3afc0 0000000000050002 00000001f5000000 0000000000000000 [ 12.106254][ T11] head: 0080000000000003 ffffea0000138e01 ffffffffffffffff 0000000000000000 [ 12.106471][ T11] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 12.106700][ T11] page dumped because: kasan: bad access detected [ 12.106884][ T11] [ 12.106959][ T11] Memory state around the buggy address: [ 12.107096][ T11] ffff888004e37f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 12.107299][ T11] ffff888004e38000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 12.107482][ T11] >ffff888004e38080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.107688][ T11] ^ [ 12.107883][ T11] ffff888004e38100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.108091][ T11] ffff888004e38180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 12.108316][ T11] ================================================================== [ 12.108554][ T11] Disabling lock debugging due to kernel taint [ 12.486056][ C2] TCP: request_sock_TCPv6: Possible SYN flooding on port [2001:db8:254::1]:7010. Sending cookies.