[ 36.410782][ T66] ================================================================== [ 36.411063][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 36.411253][ T66] Read of size 8 at addr ffff888005ae80f8 by task kworker/u16:1/66 [ 36.411442][ T66] [ 36.411506][ T66] CPU: 2 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 36.411691][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 36.411843][ T66] Workqueue: netns cleanup_net [ 36.411975][ T66] Call Trace: [ 36.412068][ T66] [ 36.412135][ T66] dump_stack_lvl+0x82/0xd0 [ 36.412263][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 36.412417][ T66] ? cleanup_net+0xa5d/0xb90 [ 36.412542][ T66] print_report+0xb4/0x270 [ 36.412663][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 36.412784][ T66] kasan_report+0xbd/0xf0 [ 36.412877][ T66] ? cleanup_net+0xa5d/0xb90 [ 36.413001][ T66] cleanup_net+0xa5d/0xb90 [ 36.413124][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 36.413251][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 36.413373][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 36.413495][ T66] ? lock_acquire+0x32/0xc0 [ 36.413619][ T66] ? process_one_work+0xe0b/0x16d0 [ 36.413744][ T66] process_one_work+0xe55/0x16d0 [ 36.413869][ T66] ? __pfx___lock_release+0x10/0x10 [ 36.413991][ T66] ? __pfx_process_one_work+0x10/0x10 [ 36.414119][ T66] ? assign_work+0x16c/0x240 [ 36.414242][ T66] worker_thread+0x58c/0xce0 [ 36.414368][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 36.414523][ T66] ? __pfx_worker_thread+0x10/0x10 [ 36.414647][ T66] ? __pfx_worker_thread+0x10/0x10 [ 36.414770][ T66] kthread+0x28a/0x350 [ 36.414864][ T66] ? __pfx_kthread+0x10/0x10 [ 36.414987][ T66] ret_from_fork+0x31/0x70 [ 36.415112][ T66] ? __pfx_kthread+0x10/0x10 [ 36.415235][ T66] ret_from_fork_asm+0x1a/0x30 [ 36.415362][ T66] [ 36.415454][ T66] [ 36.415521][ T66] Allocated by task 259: [ 36.415617][ T66] kasan_save_stack+0x24/0x50 [ 36.415744][ T66] kasan_save_track+0x14/0x30 [ 36.415863][ T66] __kasan_slab_alloc+0x59/0x70 [ 36.415984][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 36.416108][ T66] copy_net_ns+0xc6/0x540 [ 36.416199][ T66] create_new_namespaces+0x35f/0x920 [ 36.416329][ T66] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 36.416463][ T66] ksys_unshare+0x2c4/0x6e0 [ 36.416588][ T66] __x64_sys_unshare+0x31/0x40 [ 36.416712][ T66] do_syscall_64+0xc1/0x1d0 [ 36.416835][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 36.416986][ T66] [ 36.417049][ T66] Freed by task 66: [ 36.417140][ T66] kasan_save_stack+0x24/0x50 [ 36.417264][ T66] kasan_save_track+0x14/0x30 [ 36.417385][ T66] kasan_save_free_info+0x3b/0x60 [ 36.417509][ T66] __kasan_slab_free+0x38/0x50 [ 36.417631][ T66] kmem_cache_free+0xf8/0x330 [ 36.417752][ T66] cleanup_net+0x5a8/0xb90 [ 36.417873][ T66] process_one_work+0xe55/0x16d0 [ 36.417997][ T66] worker_thread+0x58c/0xce0 [ 36.418121][ T66] kthread+0x28a/0x350 [ 36.418216][ T66] ret_from_fork+0x31/0x70 [ 36.418338][ T66] ret_from_fork_asm+0x1a/0x30 [ 36.418464][ T66] [ 36.418528][ T66] The buggy address belongs to the object at ffff888005ae8040 [ 36.418528][ T66] which belongs to the cache net_namespace of size 6528 [ 36.418847][ T66] The buggy address is located 184 bytes inside of [ 36.418847][ T66] freed 6528-byte region [ffff888005ae8040, ffff888005ae99c0) [ 36.419144][ T66] [ 36.419205][ T66] The buggy address belongs to the physical page: [ 36.419354][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5ae8 [ 36.419569][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 36.419753][ T66] flags: 0x80000000000040(head|node=0|zone=1) [ 36.419911][ T66] page_type: f5(slab) [ 36.420010][ T66] raw: 0080000000000040 ffff888001975240 ffff88800197a0a8 ffff88800197a0a8 [ 36.420234][ T66] raw: 0000000000000000 0000000000040004 00000001f5000000 0000000000000000 [ 36.420453][ T66] head: 0080000000000040 ffff888001975240 ffff88800197a0a8 ffff88800197a0a8 [ 36.420669][ T66] head: 0000000000000000 0000000000040004 00000001f5000000 0000000000000000 [ 36.420882][ T66] head: 0080000000000003 ffffea000016ba01 ffffffffffffffff 0000000000000000 [ 36.421097][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 36.421308][ T66] page dumped because: kasan: bad access detected [ 36.421457][ T66] [ 36.421517][ T66] Memory state around the buggy address: [ 36.421633][ T66] ffff888005ae7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 36.421808][ T66] ffff888005ae8000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 36.421985][ T66] >ffff888005ae8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.422159][ T66] ^ [ 36.422331][ T66] ffff888005ae8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.422505][ T66] ffff888005ae8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.422675][ T66] ================================================================== [ 36.422899][ T66] Disabling lock debugging due to kernel taint