[ 145.778725][ T11] ==================================================================
[ 145.779056][ T11] BUG: KASAN: slab-use-after-free in cleanup_net+0x932/0xa40
[ 145.779352][ T11] Read of size 8 at addr ffff888005cf1c38 by task kworker/u16:0/11
[ 145.779620][ T11]
[ 145.779722][ T11] CPU: 2 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.12.0-virtme #1
[ 145.780004][ T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 145.780247][ T11] Workqueue: netns cleanup_net
[ 145.780441][ T11] Call Trace:
[ 145.780588][ T11]
[ 145.780691][ T11] dump_stack_lvl+0x82/0xd0
[ 145.780891][ T11] print_address_description.constprop.0+0x2c/0x3b0
[ 145.781131][ T11] ? cleanup_net+0x932/0xa40
[ 145.781328][ T11] print_report+0xb4/0x270
[ 145.781515][ T11] ? kasan_addr_to_slab+0x25/0x80
[ 145.781711][ T11] kasan_report+0xbd/0xf0
[ 145.781849][ T11] ? cleanup_net+0x932/0xa40
[ 145.782046][ T11] cleanup_net+0x932/0xa40
[ 145.782246][ T11] ? __pfx_lock_acquire.part.0+0x10/0x10
[ 145.782439][ T11] ? __pfx_cleanup_net+0x10/0x10
[ 145.782617][ T11] ? trace_lock_acquire+0x148/0x1f0
[ 145.782815][ T11] ? lock_acquire+0x32/0xc0
[ 145.783022][ T11] ? process_one_work+0xe0b/0x16d0
[ 145.783224][ T11] process_one_work+0xe55/0x16d0
[ 145.783423][ T11] ? __pfx___lock_release+0x10/0x10
[ 145.783622][ T11] ? __pfx_process_one_work+0x10/0x10
[ 145.783820][ T11] ? assign_work+0x16c/0x240
[ 145.784010][ T11] worker_thread+0x58c/0xce0
[ 145.784199][ T11] ? __pfx_worker_thread+0x10/0x10
[ 145.784403][ T11] kthread+0x28a/0x350
[ 145.784554][ T11] ? __pfx_kthread+0x10/0x10
[ 145.784736][ T11] ret_from_fork+0x31/0x70
[ 145.784919][ T11] ? __pfx_kthread+0x10/0x10
[ 145.785104][ T11] ret_from_fork_asm+0x1a/0x30
[ 145.785304][ T11]
[ 145.785476][ T11]
[ 145.785614][ T11] Allocated by task 325:
[ 145.785753][ T11] kasan_save_stack+0x24/0x50
[ 145.785948][ T11] kasan_save_track+0x14/0x30
[ 145.786134][ T11] __kasan_slab_alloc+0x59/0x70
[ 145.786318][ T11] kmem_cache_alloc_noprof+0x10b/0x350
[ 145.786509][ T11] copy_net_ns+0xc6/0x340
[ 145.786651][ T11] create_new_namespaces+0x35f/0x920
[ 145.786843][ T11] unshare_nsproxy_namespaces+0x8d/0x130
[ 145.787023][ T11] ksys_unshare+0x2a9/0x660
[ 145.787237][ T11] __x64_sys_unshare+0x31/0x40
[ 145.787426][ T11] do_syscall_64+0xc1/0x1d0
[ 145.787620][ T11] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 145.787860][ T11]
[ 145.787964][ T11] Freed by task 11:
[ 145.788111][ T11] kasan_save_stack+0x24/0x50
[ 145.788311][ T11] kasan_save_track+0x14/0x30
[ 145.788501][ T11] kasan_save_free_info+0x3b/0x60
[ 145.788700][ T11] __kasan_slab_free+0x38/0x50
[ 145.788886][ T11] kmem_cache_free+0xf8/0x330
[ 145.789080][ T11] cleanup_net+0x5a8/0xa40
[ 145.789266][ T11] process_one_work+0xe55/0x16d0
[ 145.789482][ T11] worker_thread+0x58c/0xce0
[ 145.789681][ T11] kthread+0x28a/0x350
[ 145.789832][ T11] ret_from_fork+0x31/0x70
[ 145.790035][ T11] ret_from_fork_asm+0x1a/0x30
[ 145.790238][ T11]
[ 145.790348][ T11] The buggy address belongs to the object at ffff888005cf1b80
[ 145.790348][ T11] which belongs to the cache net_namespace of size 6592
[ 145.790883][ T11] The buggy address is located 184 bytes inside of
[ 145.790883][ T11] freed 6592-byte region [ffff888005cf1b80, ffff888005cf3540)
[ 145.791371][ T11]
[ 145.791477][ T11] The buggy address belongs to the physical page:
[ 145.791725][ T11] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888005cf5200 pfn:0x5cf0
[ 145.792182][ T11] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
[ 145.792470][ T11] flags: 0x80000000000240(workingset|head|node=0|zone=1)
[ 145.792734][ T11] page_type: f5(slab)
[ 145.792893][ T11] raw: 0080000000000240 ffff888001963240 ffff888001968088 ffff888001968088
[ 145.793237][ T11] raw: ffff888005cf5200 0000000000040003 00000001f5000000 0000000000000000
[ 145.793580][ T11] head: 0080000000000240 ffff888001963240 ffff888001968088 ffff888001968088
[ 145.793923][ T11] head: ffff888005cf5200 0000000000040003 00000001f5000000 0000000000000000
[ 145.794256][ T11] head: 0080000000000003 ffffea0000173c01 ffffffffffffffff 0000000000000000
[ 145.794596][ T11] head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
[ 145.794924][ T11] page dumped because: kasan: bad access detected
[ 145.795151][ T11]
[ 145.795249][ T11] Memory state around the buggy address:
[ 145.795434][ T11] ffff888005cf1b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 145.795768][ T11] ffff888005cf1b80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 145.796055][ T11] >ffff888005cf1c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 145.796332][ T11] ^
[ 145.796550][ T11] ffff888005cf1c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 145.796814][ T11] ffff888005cf1d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 145.797080][ T11] ==================================================================
[ 145.797479][ T11] Disabling lock debugging due to kernel taint
[ 318.839472][ T6195] iperf3[6195]: segfault at 6dbe00006574 ip 00006dbe00006574 sp 00007ffdbe898760 error 14 likely on CPU 3 (core 3, socket 0)
[ 318.839940][ T6195] Code: Unable to access opcode bytes at 0x6dbe0000654a.
[ 369.660740][ T8566] iperf3[8566]: segfault at 1 ip 00007f2ad36cdd20 sp 00007ffe390ff7b0 error 6 in libc.so.6[95d20,7f2ad3660000+175000] likely on CPU 0 (core 0, socket 0)
[ 369.661465][ T8566] Code: e9 45 ff ff ff 0f 1f 44 00 00 41 c6 04 24 00 e9 2b ff ff ff 66 0f 1f 44 00 00 48 89 ef e8 08 27 f9 ff 48 8b 05 c1 30 16 00 64 00 16 00 00 00 48 83 c4 38 31 c0 5b 5d 41 5c 41 5d c3 0f 1f 44
[ 369.664801][ T8571] iperf3[8571]: segfault at 35457c19 ip 0000000035457c19 sp 00007fff7dd99470 error 14 likely on CPU 3 (core 3, socket 0)
[ 369.665567][ T8571] Code: Unable to access opcode bytes at 0x35457bef.