[ 10.790566][ T11] ================================================================== [ 10.790901][ T11] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.791100][ T11] Read of size 8 at addr ffff8880090800f8 by task kworker/u16:0/11 [ 10.791291][ T11] [ 10.791374][ T11] CPU: 1 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.12.0-virtme #1 [ 10.791584][ T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.791755][ T11] Workqueue: netns cleanup_net [ 10.791895][ T11] Call Trace: [ 10.791994][ T11] [ 10.792067][ T11] dump_stack_lvl+0x82/0xd0 [ 10.792203][ T11] print_address_description.constprop.0+0x2c/0x3b0 [ 10.792377][ T11] ? cleanup_net+0x932/0xa40 [ 10.792514][ T11] print_report+0xb4/0x270 [ 10.792667][ T11] ? kasan_addr_to_slab+0x25/0x80 [ 10.792831][ T11] kasan_report+0xbd/0xf0 [ 10.792971][ T11] ? cleanup_net+0x932/0xa40 [ 10.793131][ T11] cleanup_net+0x932/0xa40 [ 10.793294][ T11] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.793442][ T11] ? __pfx_cleanup_net+0x10/0x10 [ 10.793594][ T11] ? trace_lock_acquire+0x148/0x1f0 [ 10.793736][ T11] ? lock_acquire+0x32/0xc0 [ 10.793912][ T11] ? process_one_work+0xe0b/0x16d0 [ 10.794051][ T11] process_one_work+0xe55/0x16d0 [ 10.794184][ T11] ? __pfx___lock_release+0x10/0x10 [ 10.794341][ T11] ? __pfx_process_one_work+0x10/0x10 [ 10.794497][ T11] ? assign_work+0x16c/0x240 [ 10.794634][ T11] worker_thread+0x58c/0xce0 [ 10.794787][ T11] ? __pfx_worker_thread+0x10/0x10 [ 10.794937][ T11] kthread+0x28a/0x350 [ 10.795039][ T11] ? __pfx_kthread+0x10/0x10 [ 10.795175][ T11] ret_from_fork+0x31/0x70 [ 10.795306][ T11] ? __pfx_kthread+0x10/0x10 [ 10.795439][ T11] ret_from_fork_asm+0x1a/0x30 [ 10.795590][ T11] [ 10.795690][ T11] [ 10.795757][ T11] Allocated by task 226: [ 10.795859][ T11] kasan_save_stack+0x24/0x50 [ 10.795998][ T11] kasan_save_track+0x14/0x30 [ 10.796129][ T11] __kasan_slab_alloc+0x59/0x70 [ 10.796261][ T11] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.796403][ T11] copy_net_ns+0xc6/0x340 [ 10.796502][ T11] create_new_namespaces+0x35f/0x920 [ 10.796633][ T11] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.796763][ T11] ksys_unshare+0x2a9/0x660 [ 10.796893][ T11] __x64_sys_unshare+0x31/0x40 [ 10.797026][ T11] do_syscall_64+0xc1/0x1d0 [ 10.797159][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.797322][ T11] [ 10.797391][ T11] Freed by task 11: [ 10.797492][ T11] kasan_save_stack+0x24/0x50 [ 10.797639][ T11] kasan_save_track+0x14/0x30 [ 10.797766][ T11] kasan_save_free_info+0x3b/0x60 [ 10.797925][ T11] __kasan_slab_free+0x38/0x50 [ 10.798067][ T11] kmem_cache_free+0xf8/0x330 [ 10.798211][ T11] cleanup_net+0x5a8/0xa40 [ 10.798359][ T11] process_one_work+0xe55/0x16d0 [ 10.798506][ T11] worker_thread+0x58c/0xce0 [ 10.798649][ T11] kthread+0x28a/0x350 [ 10.798761][ T11] ret_from_fork+0x31/0x70 [ 10.798920][ T11] ret_from_fork_asm+0x1a/0x30 [ 10.799066][ T11] [ 10.799143][ T11] The buggy address belongs to the object at ffff888009080040 [ 10.799143][ T11] which belongs to the cache net_namespace of size 5696 [ 10.799541][ T11] The buggy address is located 184 bytes inside of [ 10.799541][ T11] freed 5696-byte region [ffff888009080040, ffff888009081680) [ 10.799932][ T11] [ 10.800009][ T11] The buggy address belongs to the physical page: [ 10.800196][ T11] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888009082fc0 pfn:0x9080 [ 10.800497][ T11] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.800740][ T11] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.800949][ T11] page_type: f5(slab) [ 10.801095][ T11] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.801383][ T11] raw: ffff888009082fc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.801652][ T11] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.801934][ T11] head: ffff888009082fc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.802221][ T11] head: 0080000000000003 ffffea0000242001 ffffffffffffffff 0000000000000000 [ 10.802526][ T11] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.802841][ T11] page dumped because: kasan: bad access detected [ 10.803065][ T11] [ 10.803169][ T11] Memory state around the buggy address: [ 10.803340][ T11] ffff88800907ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 10.803560][ T11] ffff888009080000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.803804][ T11] >ffff888009080080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.804011][ T11] ^ [ 10.804201][ T11] ffff888009080100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.804435][ T11] ffff888009080180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.804634][ T11] ================================================================== [ 10.805023][ T11] Disabling lock debugging due to kernel taint