[ 11.939021][ T11] ================================================================== [ 11.939322][ T11] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 11.939541][ T11] Read of size 8 at addr ffff88800b8200f8 by task kworker/u16:0/11 [ 11.939762][ T11] [ 11.939852][ T11] CPU: 2 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.12.0-virtme #1 [ 11.940110][ T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 11.940317][ T11] Workqueue: netns cleanup_net [ 11.940500][ T11] Call Trace: [ 11.940633][ T11] [ 11.940722][ T11] dump_stack_lvl+0x82/0xd0 [ 11.940893][ T11] print_address_description.constprop.0+0x2c/0x3b0 [ 11.941108][ T11] ? cleanup_net+0x932/0xa40 [ 11.941266][ T11] print_report+0xb4/0x270 [ 11.941416][ T11] ? kasan_addr_to_slab+0x25/0x80 [ 11.941553][ T11] kasan_report+0xbd/0xf0 [ 11.941662][ T11] ? cleanup_net+0x932/0xa40 [ 11.941816][ T11] cleanup_net+0x932/0xa40 [ 11.941960][ T11] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 11.942110][ T11] ? __pfx_cleanup_net+0x10/0x10 [ 11.942253][ T11] ? trace_lock_acquire+0x148/0x1f0 [ 11.942404][ T11] ? lock_acquire+0x32/0xc0 [ 11.942550][ T11] ? process_one_work+0xe0b/0x16d0 [ 11.942707][ T11] process_one_work+0xe55/0x16d0 [ 11.942854][ T11] ? __pfx___lock_release+0x10/0x10 [ 11.943010][ T11] ? __pfx_process_one_work+0x10/0x10 [ 11.943143][ T11] ? assign_work+0x16c/0x240 [ 11.943275][ T11] worker_thread+0x58c/0xce0 [ 11.943421][ T11] ? __pfx_worker_thread+0x10/0x10 [ 11.943567][ T11] kthread+0x28a/0x350 [ 11.943684][ T11] ? __pfx_kthread+0x10/0x10 [ 11.943841][ T11] ret_from_fork+0x31/0x70 [ 11.944003][ T11] ? __pfx_kthread+0x10/0x10 [ 11.944131][ T11] ret_from_fork_asm+0x1a/0x30 [ 11.944288][ T11] [ 11.944413][ T11] [ 11.944494][ T11] Allocated by task 227: [ 11.944605][ T11] kasan_save_stack+0x24/0x50 [ 11.944755][ T11] kasan_save_track+0x14/0x30 [ 11.944894][ T11] __kasan_slab_alloc+0x59/0x70 [ 11.945034][ T11] kmem_cache_alloc_noprof+0x10b/0x350 [ 11.945168][ T11] copy_net_ns+0xc6/0x340 [ 11.945269][ T11] create_new_namespaces+0x35f/0x920 [ 11.945419][ T11] unshare_nsproxy_namespaces+0x8d/0x130 [ 11.945597][ T11] ksys_unshare+0x2a9/0x660 [ 11.945753][ T11] __x64_sys_unshare+0x31/0x40 [ 11.945895][ T11] do_syscall_64+0xc1/0x1d0 [ 11.946018][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 11.946223][ T11] [ 11.946306][ T11] Freed by task 11: [ 11.946408][ T11] kasan_save_stack+0x24/0x50 [ 11.946551][ T11] kasan_save_track+0x14/0x30 [ 11.946736][ T11] kasan_save_free_info+0x3b/0x60 [ 11.946880][ T11] __kasan_slab_free+0x38/0x50 [ 11.947048][ T11] kmem_cache_free+0xf8/0x330 [ 11.947186][ T11] cleanup_net+0x5a8/0xa40 [ 11.947322][ T11] process_one_work+0xe55/0x16d0 [ 11.947453][ T11] worker_thread+0x58c/0xce0 [ 11.947583][ T11] kthread+0x28a/0x350 [ 11.947682][ T11] ret_from_fork+0x31/0x70 [ 11.947817][ T11] ret_from_fork_asm+0x1a/0x30 [ 11.947965][ T11] [ 11.948038][ T11] The buggy address belongs to the object at ffff88800b820040 [ 11.948038][ T11] which belongs to the cache net_namespace of size 5696 [ 11.948458][ T11] The buggy address is located 184 bytes inside of [ 11.948458][ T11] freed 5696-byte region [ffff88800b820040, ffff88800b821680) [ 11.948804][ T11] [ 11.948883][ T11] The buggy address belongs to the physical page: [ 11.949044][ T11] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800b822fc0 pfn:0xb820 [ 11.949326][ T11] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 11.949528][ T11] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 11.949697][ T11] page_type: f5(slab) [ 11.949798][ T11] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.950038][ T11] raw: ffff88800b822fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.950311][ T11] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 11.950541][ T11] head: ffff88800b822fc0 0000000000050002 00000001f5000000 0000000000000000 [ 11.950787][ T11] head: 0080000000000003 ffffea00002e0801 ffffffffffffffff 0000000000000000 [ 11.951118][ T11] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 11.951474][ T11] page dumped because: kasan: bad access detected [ 11.951727][ T11] [ 11.951823][ T11] Memory state around the buggy address: [ 11.952025][ T11] ffff88800b81ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.952312][ T11] ffff88800b820000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 11.952548][ T11] >ffff88800b820080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.952723][ T11] ^ [ 11.952902][ T11] ffff88800b820100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.953075][ T11] ffff88800b820180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.953250][ T11] ================================================================== [ 11.953499][ T11] Disabling lock debugging due to kernel taint