[ 21.263500][ T231] ==================================================================
[ 21.263857][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 21.264103][ T231] Read of size 1 at addr ffff8880029a468c by task packetdrill/231
[ 21.264374][ T231]
[ 21.264475][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.264483][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.264487][ T231] Call Trace:
[ 21.264489][ T231]
[ 21.264492][ T231] dump_stack_lvl+0x82/0xc0
[ 21.264499][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 21.264508][ T231] ? kobject_put+0xbb/0xd0
[ 21.264512][ T231] print_report+0xb4/0x270
[ 21.264516][ T231] ? kobject_put+0xbb/0xd0
[ 21.264519][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 21.264523][ T231] ? kobject_put+0xbb/0xd0
[ 21.264526][ T231] kasan_report+0xca/0x100
[ 21.264530][ T231] ? kobject_put+0xbb/0xd0
[ 21.264535][ T231] kobject_put+0xbb/0xd0
[ 21.264539][ T231] netdev_run_todo+0x5f0/0xc60
[ 21.264545][ T231] ? rtnl_is_locked+0x15/0x20
[ 21.264549][ T231] ? netif_state_change+0x228/0x2c0
[ 21.264552][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 21.264555][ T231] ? generic_xdp_install+0x410/0x410
[ 21.264559][ T231] ? tun_chr_close+0xae/0x1c0
[ 21.264567][ T231] tun_chr_close+0xc0/0x1c0
[ 21.264571][ T231] __fput+0x35c/0xa70
[ 21.264579][ T231] fput_close_sync+0xdd/0x1b0
[ 21.264582][ T231] ? alloc_file_clone+0xf0/0xf0
[ 21.264587][ T231] __x64_sys_close+0x7d/0xd0
[ 21.264591][ T231] do_syscall_64+0xc1/0xfd0
[ 21.264597][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.264602][ T231] RIP: 0033:0x4901eb
[ 21.264607][ T231] Code: 03 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 c3 78 04 00 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 21 79 04 00 8b 44
[ 21.264610][ T231] RSP: 002b:00007ffe407f2af0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 21.264615][ T231] RAX: ffffffffffffffda RBX: 00007ffe407f3050 RCX: 00000000004901eb
[ 21.264617][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 21.264619][ T231] RBP: 00007ffe407f2b30 R08: 0000000000000000 R09: 0000000000000000
[ 21.264621][ T231] R10: 0000000000000010 R11: 0000000000000293 R12: 00007ffe407f2fc8
[ 21.264623][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 21.264629][ T231]
[ 21.264631][ T231]
[ 21.271513][ T231] The buggy address belongs to the physical page:
[ 21.271728][ T231] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29a4
[ 21.272014][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 21.272194][ T231] raw: 0080000000000000 ffffea000013cf08 ffff88803623bc40 0000000000000000
[ 21.272539][ T231] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 21.272855][ T231] page dumped because: kasan: bad access detected
[ 21.273071][ T231]
[ 21.273174][ T231] Memory state around the buggy address:
[ 21.273347][ T231] ffff8880029a4580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.273649][ T231] ffff8880029a4600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.273938][ T231] >ffff8880029a4680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.274207][ T231] ^
[ 21.274336][ T231] ffff8880029a4700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.274596][ T231] ffff8880029a4780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.274860][ T231] ==================================================================
[ 21.275290][ T231] Disabling lock debugging due to kernel taint
[ 21.275542][ T231] ------------[ cut here ]------------
[ 21.275720][ T231] refcount_t: underflow; use-after-free.
[ 21.275929][ T231] WARNING: CPU: 0 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 21.276231][ T231] Modules linked in:
[ 21.276397][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.276840][ T231] Tainted: [B]=BAD_PAGE
[ 21.276983][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.277214][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 21.277461][ T231] Code: 3f 92 02 80 fb 01 0f 87 bb b9 d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 5e 3f 92 02 01 90 48 c7 c7 20 8d 65 b9 e8 32 bf 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff
[ 21.278089][ T231] RSP: 0018:ffffc90000ab7ce8 EFLAGS: 00010282
[ 21.278324][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 21.278613][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 21.278884][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff73fe134
[ 21.279169][ T231] R10: 0000000000000003 R11: ffffc90000ab7880 R12: 0000000000000001
[ 21.279453][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 21.279734][ T231] FS: 000000002258f3c0(0000) GS:ffff88807ae1a000(0000) knlGS:0000000000000000
[ 21.280108][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.280392][ T231] CR2: 00007f0e1b8af000 CR3: 000000000fe94001 CR4: 0000000000772ef0
[ 21.280726][ T231] PKRU: 55555554
[ 21.280881][ T231] Call Trace:
[ 21.281042][ T231]
[ 21.281162][ T231] netdev_run_todo+0x5f0/0xc60
[ 21.281371][ T231] ? rtnl_is_locked+0x15/0x20
[ 21.281577][ T231] ? netif_state_change+0x228/0x2c0
[ 21.281764][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 21.282027][ T231] ? generic_xdp_install+0x410/0x410
[ 21.282210][ T231] ? tun_chr_close+0xae/0x1c0
[ 21.282397][ T231] tun_chr_close+0xc0/0x1c0
[ 21.282582][ T231] __fput+0x35c/0xa70
[ 21.282733][ T231] fput_close_sync+0xdd/0x1b0
[ 21.282926][ T231] ? alloc_file_clone+0xf0/0xf0
[ 21.283150][ T231] __x64_sys_close+0x7d/0xd0
[ 21.283356][ T231] do_syscall_64+0xc1/0xfd0
[ 21.283544][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.283860][ T231] RIP: 0033:0x4901eb
[ 21.284001][ T231] Code: 03 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 c3 78 04 00 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 21 79 04 00 8b 44
[ 21.284825][ T231] RSP: 002b:00007ffe407f2af0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 21.285124][ T231] RAX: ffffffffffffffda RBX: 00007ffe407f3050 RCX: 00000000004901eb
[ 21.285507][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 21.285747][ T231] RBP: 00007ffe407f2b30 R08: 0000000000000000 R09: 0000000000000000
[ 21.286007][ T231] R10: 0000000000000010 R11: 0000000000000293 R12: 00007ffe407f2fc8
[ 21.286418][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 21.286703][ T231]
[ 21.286859][ T231] irq event stamp: 2051483
[ 21.287049][ T231] hardirqs last enabled at (2051483): [] irqentry_exit+0x3b/0x80
[ 21.287463][ T231] hardirqs last disabled at (2051482): [] handle_softirqs+0x47f/0x610
[ 21.287774][ T231] softirqs last enabled at (2051188): [] handle_softirqs+0x352/0x610
[ 21.288178][ T231] softirqs last disabled at (2051181): [] irq_exit_rcu+0xab/0x100
[ 21.288505][ T231] ---[ end trace 0000000000000000 ]---