[ 28.236711][ T11] ================================================================== [ 28.236950][ T11] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 28.237152][ T11] Read of size 8 at addr ffff88800d0380f8 by task kworker/u16:0/11 [ 28.237329][ T11] [ 28.237393][ T11] CPU: 2 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.12.0-virtme #1 [ 28.237597][ T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 28.237755][ T11] Workqueue: netns cleanup_net [ 28.237888][ T11] Call Trace: [ 28.237985][ T11] [ 28.238053][ T11] dump_stack_lvl+0x82/0xd0 [ 28.238190][ T11] print_address_description.constprop.0+0x2c/0x3b0 [ 28.238345][ T11] ? cleanup_net+0xa5d/0xb90 [ 28.238472][ T11] print_report+0xb4/0x270 [ 28.238597][ T11] ? kasan_addr_to_slab+0x25/0x80 [ 28.238721][ T11] kasan_report+0xbd/0xf0 [ 28.238818][ T11] ? cleanup_net+0xa5d/0xb90 [ 28.238943][ T11] cleanup_net+0xa5d/0xb90 [ 28.239069][ T11] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 28.239203][ T11] ? __pfx_cleanup_net+0x10/0x10 [ 28.239327][ T11] ? trace_lock_acquire+0x148/0x1f0 [ 28.239455][ T11] ? lock_acquire+0x32/0xc0 [ 28.239585][ T11] ? process_one_work+0xe0b/0x16d0 [ 28.239722][ T11] process_one_work+0xe55/0x16d0 [ 28.239846][ T11] ? __pfx___lock_release+0x10/0x10 [ 28.239968][ T11] ? __pfx_process_one_work+0x10/0x10 [ 28.240094][ T11] ? assign_work+0x16c/0x240 [ 28.240229][ T11] worker_thread+0x58c/0xce0 [ 28.240355][ T11] ? __pfx_worker_thread+0x10/0x10 [ 28.240484][ T11] kthread+0x28a/0x350 [ 28.240583][ T11] ? __pfx_kthread+0x10/0x10 [ 28.240710][ T11] ret_from_fork+0x31/0x70 [ 28.240838][ T11] ? __pfx_kthread+0x10/0x10 [ 28.240961][ T11] ret_from_fork_asm+0x1a/0x30 [ 28.241096][ T11] [ 28.241196][ T11] [ 28.241260][ T11] Allocated by task 550: [ 28.241356][ T11] kasan_save_stack+0x24/0x50 [ 28.241484][ T11] kasan_save_track+0x14/0x30 [ 28.241611][ T11] __kasan_slab_alloc+0x59/0x70 [ 28.241737][ T11] kmem_cache_alloc_noprof+0x10b/0x350 [ 28.241860][ T11] copy_net_ns+0xc6/0x540 [ 28.241956][ T11] create_new_namespaces+0x35f/0x920 [ 28.242082][ T11] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 28.242212][ T11] ksys_unshare+0x2c4/0x6e0 [ 28.242347][ T11] __x64_sys_unshare+0x31/0x40 [ 28.242471][ T11] do_syscall_64+0xc1/0x1d0 [ 28.242598][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 28.242773][ T11] [ 28.242841][ T11] Freed by task 11: [ 28.242936][ T11] kasan_save_stack+0x24/0x50 [ 28.243061][ T11] kasan_save_track+0x14/0x30 [ 28.243184][ T11] kasan_save_free_info+0x3b/0x60 [ 28.243308][ T11] __kasan_slab_free+0x38/0x50 [ 28.243428][ T11] kmem_cache_free+0xf8/0x330 [ 28.243551][ T11] cleanup_net+0x5a8/0xb90 [ 28.243673][ T11] process_one_work+0xe55/0x16d0 [ 28.243803][ T11] worker_thread+0x58c/0xce0 [ 28.243933][ T11] kthread+0x28a/0x350 [ 28.244029][ T11] ret_from_fork+0x31/0x70 [ 28.244159][ T11] ret_from_fork_asm+0x1a/0x30 [ 28.244290][ T11] [ 28.244363][ T11] The buggy address belongs to the object at ffff88800d038040 [ 28.244363][ T11] which belongs to the cache net_namespace of size 6528 [ 28.244704][ T11] The buggy address is located 184 bytes inside of [ 28.244704][ T11] freed 6528-byte region [ffff88800d038040, ffff88800d0399c0) [ 28.245012][ T11] [ 28.245088][ T11] The buggy address belongs to the physical page: [ 28.245253][ T11] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800d03d140 pfn:0xd038 [ 28.245514][ T11] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 28.245710][ T11] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 28.245880][ T11] page_type: f5(slab) [ 28.245984][ T11] raw: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 28.246215][ T11] raw: ffff88800d03d140 0000000000040003 00000001f5000000 0000000000000000 [ 28.246440][ T11] head: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 28.246668][ T11] head: ffff88800d03d140 0000000000040003 00000001f5000000 0000000000000000 [ 28.246904][ T11] head: 0080000000000003 ffffea0000340e01 ffffffffffffffff 0000000000000000 [ 28.247135][ T11] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 28.247368][ T11] page dumped because: kasan: bad access detected [ 28.247528][ T11] [ 28.247594][ T11] Memory state around the buggy address: [ 28.247724][ T11] ffff88800d037f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 28.247913][ T11] ffff88800d038000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 28.248104][ T11] >ffff88800d038080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.248298][ T11] ^ [ 28.248483][ T11] ffff88800d038100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.248664][ T11] ffff88800d038180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.248844][ T11] ================================================================== [ 28.249144][ T11] Disabling lock debugging due to kernel taint