[ 10.776246][ T66] ================================================================== [ 10.776590][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40 [ 10.776896][ T66] Read of size 8 at addr ffff8880091f00f8 by task kworker/u16:1/66 [ 10.777217][ T66] [ 10.777322][ T66] CPU: 0 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 10.777659][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.777933][ T66] Workqueue: netns cleanup_net [ 10.778160][ T66] Call Trace: [ 10.778314][ T66] [ 10.778432][ T66] dump_stack_lvl+0x82/0xd0 [ 10.778637][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 10.778919][ T66] ? cleanup_net+0x932/0xa40 [ 10.779209][ T66] print_report+0xb4/0x270 [ 10.779409][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 10.779611][ T66] kasan_report+0xbd/0xf0 [ 10.779766][ T66] ? cleanup_net+0x932/0xa40 [ 10.779968][ T66] cleanup_net+0x932/0xa40 [ 10.780165][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.780381][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 10.780580][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 10.780783][ T66] ? lock_acquire+0x32/0xc0 [ 10.780982][ T66] ? process_one_work+0xe0b/0x16d0 [ 10.781188][ T66] process_one_work+0xe55/0x16d0 [ 10.781396][ T66] ? __pfx___lock_release+0x10/0x10 [ 10.781596][ T66] ? __pfx_process_one_work+0x10/0x10 [ 10.781804][ T66] ? assign_work+0x16c/0x240 [ 10.782002][ T66] worker_thread+0x58c/0xce0 [ 10.782203][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.782456][ T66] ? __pfx_worker_thread+0x10/0x10 [ 10.782656][ T66] ? __pfx_worker_thread+0x10/0x10 [ 10.782852][ T66] kthread+0x28a/0x350 [ 10.783045][ T66] ? __pfx_kthread+0x10/0x10 [ 10.783252][ T66] ret_from_fork+0x31/0x70 [ 10.783460][ T66] ? __pfx_kthread+0x10/0x10 [ 10.783671][ T66] ret_from_fork_asm+0x1a/0x30 [ 10.783884][ T66] [ 10.784034][ T66] [ 10.784137][ T66] Allocated by task 227: [ 10.784290][ T66] kasan_save_stack+0x24/0x50 [ 10.784502][ T66] kasan_save_track+0x14/0x30 [ 10.784709][ T66] __kasan_slab_alloc+0x59/0x70 [ 10.784934][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 10.785150][ T66] copy_net_ns+0xc6/0x340 [ 10.785306][ T66] create_new_namespaces+0x35f/0x920 [ 10.785520][ T66] unshare_nsproxy_namespaces+0x8d/0x130 [ 10.785741][ T66] ksys_unshare+0x2a9/0x660 [ 10.785950][ T66] __x64_sys_unshare+0x31/0x40 [ 10.786152][ T66] do_syscall_64+0xc1/0x1d0 [ 10.786376][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.786649][ T66] [ 10.786761][ T66] Freed by task 66: [ 10.786917][ T66] kasan_save_stack+0x24/0x50 [ 10.787122][ T66] kasan_save_track+0x14/0x30 [ 10.787333][ T66] kasan_save_free_info+0x3b/0x60 [ 10.787546][ T66] __kasan_slab_free+0x38/0x50 [ 10.787762][ T66] kmem_cache_free+0xf8/0x330 [ 10.787991][ T66] cleanup_net+0x5a8/0xa40 [ 10.788192][ T66] process_one_work+0xe55/0x16d0 [ 10.788394][ T66] worker_thread+0x58c/0xce0 [ 10.788595][ T66] kthread+0x28a/0x350 [ 10.788849][ T66] ret_from_fork+0x31/0x70 [ 10.789084][ T66] ret_from_fork_asm+0x1a/0x30 [ 10.789312][ T66] [ 10.789429][ T66] The buggy address belongs to the object at ffff8880091f0040 [ 10.789429][ T66] which belongs to the cache net_namespace of size 5696 [ 10.790036][ T66] The buggy address is located 184 bytes inside of [ 10.790036][ T66] freed 5696-byte region [ffff8880091f0040, ffff8880091f1680) [ 10.790587][ T66] [ 10.790703][ T66] The buggy address belongs to the physical page: [ 10.790984][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880091f2fc0 pfn:0x91f0 [ 10.791439][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 10.791764][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 10.792064][ T66] page_type: f5(slab) [ 10.792244][ T66] raw: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.792637][ T66] raw: ffff8880091f2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.793035][ T66] head: 0080000000000240 ffff88800195f240 ffff888001962088 ffff888001962088 [ 10.793431][ T66] head: ffff8880091f2fc0 0000000000050002 00000001f5000000 0000000000000000 [ 10.793843][ T66] head: 0080000000000003 ffffea0000247c01 ffffffffffffffff 0000000000000000 [ 10.794237][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 10.794636][ T66] page dumped because: kasan: bad access detected [ 10.794930][ T66] [ 10.795046][ T66] Memory state around the buggy address: [ 10.795280][ T66] ffff8880091eff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 10.795602][ T66] ffff8880091f0000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 10.795910][ T66] >ffff8880091f0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.796226][ T66] ^ [ 10.796567][ T66] ffff8880091f0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.796896][ T66] ffff8880091f0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 10.797217][ T66] ================================================================== [ 10.797593][ T66] Disabling lock debugging due to kernel taint