[ 10.989057][ T67] ================================================================== [ 10.989343][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.989569][ T67] Read of size 8 at addr ffff888004e200f8 by task kworker/u16:1/67 [ 10.989784][ T67] [ 10.989861][ T67] CPU: 1 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.990077][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.990257][ T67] Workqueue: netns cleanup_net [ 10.990419][ T67] Call Trace: [ 10.990535][ T67] [ 10.990612][ T67] dump_stack_lvl+0x82/0xd0 [ 10.990758][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 10.990938][ T67] ? cleanup_net+0x932/0xa40 [ 10.991084][ T67] print_report+0xb4/0x270 [ 10.991224][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 10.991381][ T67] kasan_report+0xbd/0xf0 [ 10.991492][ T67] ? cleanup_net+0x932/0xa40 [ 10.991639][ T67] cleanup_net+0x932/0xa40 [ 10.991782][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.991931][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 10.992077][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 10.992229][ T67] ? lock_acquire+0x32/0xc0 [ 10.992442][ T67] ? process_one_work+0xe0b/0x16d0 [ 10.992613][ T67] process_one_work+0xe55/0x16d0 [ 10.992760][ T67] ? __pfx___lock_release+0x10/0x10 [ 10.992936][ T67] ? __pfx_process_one_work+0x10/0x10 [ 10.993084][ T67] ? assign_work+0x16c/0x240 [ 10.993263][ T67] worker_thread+0x58c/0xce0 [ 10.993421][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.993600][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.993746][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.993886][ T67] kthread+0x28a/0x350 [ 10.993992][ T67] ? __pfx_kthread+0x10/0x10 [ 10.994175][ T67] ret_from_fork+0x31/0x70 [ 10.994418][ T67] ? __pfx_kthread+0x10/0x10 [ 10.994581][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.994775][ T67] [ 10.994889][ T67] [ 10.994998][ T67] Allocated by task 226: [ 10.995124][ T67] kasan_save_stack+0x24/0x50 [ 10.995276][ T67] kasan_save_track+0x14/0x30 [ 10.995429][ T67] __kasan_slab_alloc+0x59/0x70 [ 10.995606][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.995785][ T67] copy_net_ns+0xc6/0x340 [ 10.995892][ T67] create_new_namespaces+0x35f/0x920 [ 10.996035][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.996175][ T67] ksys_unshare+0x2a9/0x660 [ 10.996318][ T67] __x64_sys_unshare+0x31/0x40 [ 10.996485][ T67] do_syscall_64+0xc1/0x1d0 [ 10.996613][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.996787][ T67] [ 10.996853][ T67] Freed by task 67: [ 10.996973][ T67] kasan_save_stack+0x24/0x50 [ 10.997107][ T67] kasan_save_track+0x14/0x30 [ 10.997256][ T67] kasan_save_free_info+0x3b/0x60 [ 10.997394][ T67] __kasan_slab_free+0x38/0x50 [ 10.997520][ T67] kmem_cache_free+0xf8/0x330 [ 10.997646][ T67] cleanup_net+0x5a8/0xa40 [ 10.997787][ T67] process_one_work+0xe55/0x16d0 [ 10.997917][ T67] worker_thread+0x58c/0xce0 [ 10.998043][ T67] kthread+0x28a/0x350 [ 10.998141][ T67] ret_from_fork+0x31/0x70 [ 10.998270][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.998410][ T67] [ 10.998475][ T67] The buggy address belongs to the object at ffff888004e20040 [ 10.998475][ T67] which belongs to the cache net_namespace of size 5696 [ 10.998876][ T67] The buggy address is located 184 bytes inside of [ 10.998876][ T67] freed 5696-byte region [ffff888004e20040, ffff888004e21680) [ 10.999190][ T67] [ 10.999256][ T67] The buggy address belongs to the physical page: [ 10.999423][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888004e22fc0 pfn:0x4e20 [ 10.999720][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.999946][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 11.000110][ T67] page_type: f5(slab) [ 11.000213][ T67] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.000446][ T67] raw: ffff888004e22fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.000678][ T67] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.000950][ T67] head: ffff888004e22fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.001210][ T67] head: 0080000000000003 ffffea0000138801 ffffffffffffffff 0000000000000000 [ 11.001458][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 11.001691][ T67] page dumped because: kasan: bad access detected [ 11.001897][ T67] [ 11.001972][ T67] Memory state around the buggy address: [ 11.002112][ T67] ffff888004e1ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.002361][ T67] ffff888004e20000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 11.002546][ T67] >ffff888004e20080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.002790][ T67] ^ [ 11.002994][ T67] ffff888004e20100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.003198][ T67] ffff888004e20180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.003432][ T67] ================================================================== [ 11.003999][ T67] Disabling lock debugging due to kernel taint [ 11.342884][ C2] TCP: request_sock_TCPv6: Possible SYN flooding on port [2001:db8:254::1]:7010. Sending cookies. [ 12.487209][ T226] rst_ipv6 (226) used greatest stack depth: 23664 bytes left