[ 10.454192][ T67] ================================================================== [ 10.454437][ T67] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.454625][ T67] Read of size 8 at addr ffff8880094c80f8 by task kworker/u16:1/67 [ 10.454803][ T67] [ 10.454870][ T67] CPU: 3 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.455057][ T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.455213][ T67] Workqueue: netns cleanup_net [ 10.455339][ T67] Call Trace: [ 10.455436][ T67] [ 10.455503][ T67] dump_stack_lvl+0x82/0xd0 [ 10.455637][ T67] print_address_description.constprop.0+0x2c/0x3b0 [ 10.455797][ T67] ? cleanup_net+0x932/0xa40 [ 10.455926][ T67] print_report+0xb4/0x270 [ 10.456053][ T67] ? kasan_addr_to_slab+0x25/0x80 [ 10.456180][ T67] kasan_report+0xbd/0xf0 [ 10.456276][ T67] ? cleanup_net+0x932/0xa40 [ 10.456405][ T67] cleanup_net+0x932/0xa40 [ 10.456531][ T67] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.456663][ T67] ? __pfx_cleanup_net+0x10/0x10 [ 10.456787][ T67] ? trace_lock_acquire+0x148/0x1f0 [ 10.456910][ T67] ? lock_acquire+0x32/0xc0 [ 10.457032][ T67] ? process_one_work+0xe0b/0x16d0 [ 10.457161][ T67] process_one_work+0xe55/0x16d0 [ 10.457289][ T67] ? __pfx___lock_release+0x10/0x10 [ 10.457415][ T67] ? __pfx_process_one_work+0x10/0x10 [ 10.457545][ T67] ? assign_work+0x16c/0x240 [ 10.457688][ T67] worker_thread+0x58c/0xce0 [ 10.457812][ T67] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.457966][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.458089][ T67] ? __pfx_worker_thread+0x10/0x10 [ 10.458218][ T67] kthread+0x28a/0x350 [ 10.458313][ T67] ? __pfx_kthread+0x10/0x10 [ 10.458436][ T67] ret_from_fork+0x31/0x70 [ 10.458561][ T67] ? __pfx_kthread+0x10/0x10 [ 10.458684][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.458815][ T67] [ 10.458911][ T67] [ 10.458974][ T67] Allocated by task 227: [ 10.459069][ T67] kasan_save_stack+0x24/0x50 [ 10.459197][ T67] kasan_save_track+0x14/0x30 [ 10.459320][ T67] __kasan_slab_alloc+0x59/0x70 [ 10.459441][ T67] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.459562][ T67] copy_net_ns+0xc6/0x340 [ 10.459655][ T67] create_new_namespaces+0x35f/0x920 [ 10.459784][ T67] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.459907][ T67] ksys_unshare+0x2a9/0x660 [ 10.460030][ T67] __x64_sys_unshare+0x31/0x40 [ 10.460153][ T67] do_syscall_64+0xc1/0x1d0 [ 10.460275][ T67] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.460426][ T67] [ 10.460491][ T67] Freed by task 67: [ 10.460585][ T67] kasan_save_stack+0x24/0x50 [ 10.460710][ T67] kasan_save_track+0x14/0x30 [ 10.460832][ T67] kasan_save_free_info+0x3b/0x60 [ 10.460955][ T67] __kasan_slab_free+0x38/0x50 [ 10.461080][ T67] kmem_cache_free+0xf8/0x330 [ 10.461206][ T67] cleanup_net+0x5a8/0xa40 [ 10.461333][ T67] process_one_work+0xe55/0x16d0 [ 10.461454][ T67] worker_thread+0x58c/0xce0 [ 10.461578][ T67] kthread+0x28a/0x350 [ 10.461673][ T67] ret_from_fork+0x31/0x70 [ 10.461794][ T67] ret_from_fork_asm+0x1a/0x30 [ 10.461919][ T67] [ 10.461982][ T67] The buggy address belongs to the object at ffff8880094c8040 [ 10.461982][ T67] which belongs to the cache net_namespace of size 5696 [ 10.462313][ T67] The buggy address is located 184 bytes inside of [ 10.462313][ T67] freed 5696-byte region [ffff8880094c8040, ffff8880094c9680) [ 10.462605][ T67] [ 10.462668][ T67] The buggy address belongs to the physical page: [ 10.462815][ T67] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880094cafc0 pfn:0x94c8 [ 10.463090][ T67] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.463277][ T67] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.463432][ T67] page_type: f5(slab) [ 10.463531][ T67] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.463749][ T67] raw: ffff8880094cafc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.463965][ T67] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.464182][ T67] head: ffff8880094cafc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.464393][ T67] head: 0080000000000003 ffffea0000253201 ffffffffffffffff 0000000000000000 [ 10.464604][ T67] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.464823][ T67] page dumped because: kasan: bad access detected [ 10.464973][ T67] [ 10.465034][ T67] Memory state around the buggy address: [ 10.465154][ T67] ffff8880094c7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 10.465329][ T67] ffff8880094c8000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.465501][ T67] >ffff8880094c8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.465686][ T67] ^ [ 10.465863][ T67] ffff8880094c8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.466036][ T67] ffff8880094c8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.466210][ T67] ================================================================== [ 10.466408][ T67] Disabling lock debugging due to kernel taint [ 11.159854][ T227] icmps-discard_i (227) used greatest stack depth: 24360 bytes left