[ 11.323610][ T274] gro (274) used greatest stack depth: 24008 bytes left [ 11.661923][ T66] ================================================================== [ 11.662133][ T66] BUG: KASAN: slab-use-after-free in cleanup_net+0xa5d/0xb90 [ 11.662326][ T66] Read of size 8 at addr ffff88800c931bf8 by task kworker/u16:1/66 [ 11.662505][ T66] [ 11.662578][ T66] CPU: 1 UID: 0 PID: 66 Comm: kworker/u16:1 Not tainted 6.12.0-virtme #1 [ 11.662767][ T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 11.662923][ T66] Workqueue: netns cleanup_net [ 11.663059][ T66] Call Trace: [ 11.663155][ T66] [ 11.663220][ T66] dump_stack_lvl+0x82/0xd0 [ 11.663353][ T66] print_address_description.constprop.0+0x2c/0x3b0 [ 11.663509][ T66] ? cleanup_net+0xa5d/0xb90 [ 11.663638][ T66] print_report+0xb4/0x270 [ 11.663761][ T66] ? kasan_addr_to_slab+0x25/0x80 [ 11.663888][ T66] kasan_report+0xbd/0xf0 [ 11.663982][ T66] ? cleanup_net+0xa5d/0xb90 [ 11.664106][ T66] cleanup_net+0xa5d/0xb90 [ 11.664227][ T66] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 11.664352][ T66] ? __pfx_cleanup_net+0x10/0x10 [ 11.664476][ T66] ? trace_lock_acquire+0x148/0x1f0 [ 11.664600][ T66] ? lock_acquire+0x32/0xc0 [ 11.664722][ T66] ? process_one_work+0xe0b/0x16d0 [ 11.664847][ T66] process_one_work+0xe55/0x16d0 [ 11.664973][ T66] ? __pfx___lock_release+0x10/0x10 [ 11.665101][ T66] ? __pfx_process_one_work+0x10/0x10 [ 11.665227][ T66] ? assign_work+0x16c/0x240 [ 11.665351][ T66] worker_thread+0x58c/0xce0 [ 11.665476][ T66] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 11.665629][ T66] ? __pfx_worker_thread+0x10/0x10 [ 11.665754][ T66] ? __pfx_worker_thread+0x10/0x10 [ 11.665878][ T66] kthread+0x28a/0x350 [ 11.665973][ T66] ? __pfx_kthread+0x10/0x10 [ 11.666096][ T66] ret_from_fork+0x31/0x70 [ 11.666219][ T66] ? __pfx_kthread+0x10/0x10 [ 11.666344][ T66] ret_from_fork_asm+0x1a/0x30 [ 11.666473][ T66] [ 11.666568][ T66] [ 11.666632][ T66] Allocated by task 270: [ 11.666731][ T66] kasan_save_stack+0x24/0x50 [ 11.666859][ T66] kasan_save_track+0x14/0x30 [ 11.666982][ T66] __kasan_slab_alloc+0x59/0x70 [ 11.667103][ T66] kmem_cache_alloc_noprof+0x10b/0x350 [ 11.667236][ T66] copy_net_ns+0xc6/0x540 [ 11.667330][ T66] create_new_namespaces+0x35f/0x920 [ 11.667454][ T66] unshare_nsproxy_namespaces+0x8a/0x1b0 [ 11.667577][ T66] ksys_unshare+0x2c4/0x6e0 [ 11.667700][ T66] __x64_sys_unshare+0x31/0x40 [ 11.667824][ T66] do_syscall_64+0xc1/0x1d0 [ 11.667947][ T66] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 11.668099][ T66] [ 11.668161][ T66] Freed by task 66: [ 11.668253][ T66] kasan_save_stack+0x24/0x50 [ 11.668384][ T66] kasan_save_track+0x14/0x30 [ 11.668506][ T66] kasan_save_free_info+0x3b/0x60 [ 11.668629][ T66] __kasan_slab_free+0x38/0x50 [ 11.668752][ T66] kmem_cache_free+0xf8/0x330 [ 11.668883][ T66] cleanup_net+0x5a8/0xb90 [ 11.669004][ T66] process_one_work+0xe55/0x16d0 [ 11.669125][ T66] worker_thread+0x58c/0xce0 [ 11.669257][ T66] kthread+0x28a/0x350 [ 11.669357][ T66] ret_from_fork+0x31/0x70 [ 11.669480][ T66] ret_from_fork_asm+0x1a/0x30 [ 11.669603][ T66] [ 11.669667][ T66] The buggy address belongs to the object at ffff88800c931b40 [ 11.669667][ T66] which belongs to the cache net_namespace of size 6528 [ 11.669990][ T66] The buggy address is located 184 bytes inside of [ 11.669990][ T66] freed 6528-byte region [ffff88800c931b40, ffff88800c9334c0) [ 11.670289][ T66] [ 11.670354][ T66] The buggy address belongs to the physical page: [ 11.670503][ T66] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800c933640 pfn:0xc930 [ 11.670750][ T66] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 11.670936][ T66] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 11.671095][ T66] page_type: f5(slab) [ 11.671193][ T66] raw: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 11.671414][ T66] raw: ffff88800c933640 0000000000040002 00000001f5000000 0000000000000000 [ 11.671629][ T66] head: 0080000000000240 ffff888001975240 ffff88800197a088 ffff88800197a088 [ 11.671847][ T66] head: ffff88800c933640 0000000000040002 00000001f5000000 0000000000000000 [ 11.672064][ T66] head: 0080000000000003 ffffea0000324c01 ffffffffffffffff 0000000000000000 [ 11.672282][ T66] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 [ 11.672505][ T66] page dumped because: kasan: bad access detected [ 11.672660][ T66] [ 11.672723][ T66] Memory state around the buggy address: [ 11.672844][ T66] ffff88800c931a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 11.673024][ T66] ffff88800c931b00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 11.673199][ T66] >ffff88800c931b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.673378][ T66] ^ [ 11.673558][ T66] ffff88800c931c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.673736][ T66] ffff88800c931c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 11.673911][ T66] ================================================================== [ 11.674138][ T66] Disabling lock debugging due to kernel taint