[ 21.911162][ T233] ==================================================================
[ 21.911527][ T233] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 21.911761][ T233] Read of size 1 at addr ffff888009c3468c by task packetdrill/233
[ 21.912074][ T233]
[ 21.912198][ T233] CPU: 0 UID: 0 PID: 233 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.912204][ T233] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.912207][ T233] Call Trace:
[ 21.912209][ T233]
[ 21.912212][ T233] dump_stack_lvl+0x82/0xc0
[ 21.912219][ T233] print_address_description.constprop.0+0x2c/0x3a0
[ 21.912227][ T233] ? kobject_put+0xbb/0xd0
[ 21.912231][ T233] print_report+0xb4/0x270
[ 21.912235][ T233] ? kobject_put+0xbb/0xd0
[ 21.912238][ T233] ? kasan_addr_to_slab+0x21/0x70
[ 21.912242][ T233] ? kobject_put+0xbb/0xd0
[ 21.912245][ T233] kasan_report+0xca/0x100
[ 21.912249][ T233] ? kobject_put+0xbb/0xd0
[ 21.912255][ T233] kobject_put+0xbb/0xd0
[ 21.912259][ T233] netdev_run_todo+0x5f0/0xc60
[ 21.912264][ T233] ? rtnl_is_locked+0x15/0x20
[ 21.912268][ T233] ? netif_state_change+0x228/0x2c0
[ 21.912271][ T233] ? call_netdevice_notifiers_info+0x100/0x100
[ 21.912274][ T233] ? generic_xdp_install+0x410/0x410
[ 21.912278][ T233] ? tun_chr_close+0xae/0x1c0
[ 21.912286][ T233] tun_chr_close+0xc0/0x1c0
[ 21.912290][ T233] __fput+0x35c/0xa70
[ 21.912298][ T233] fput_close_sync+0xdd/0x1b0
[ 21.912301][ T233] ? alloc_file_clone+0xf0/0xf0
[ 21.912305][ T233] __x64_sys_close+0x7d/0xd0
[ 21.912309][ T233] do_syscall_64+0xc1/0xfd0
[ 21.912316][ T233] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.912321][ T233] RIP: 0033:0x4901eb
[ 21.912328][ T233] 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
[ 21.912332][ T233] RSP: 002b:00007ffd18bd8820 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 21.912338][ T233] RAX: ffffffffffffffda RBX: 00007ffd18bd8d80 RCX: 00000000004901eb
[ 21.912341][ T233] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 21.912344][ T233] RBP: 00007ffd18bd8860 R08: 0000000000000000 R09: 0000000000000000
[ 21.912346][ T233] R10: 0000000003934cf0 R11: 0000000000000293 R12: 00007ffd18bd8cf8
[ 21.912348][ T233] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 21.912355][ T233]
[ 21.912356][ T233]
[ 21.920316][ T233] The buggy address belongs to the physical page:
[ 21.920579][ T233] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9c34
[ 21.920911][ T233] flags: 0x80000000000000(node=0|zone=1)
[ 21.921175][ T233] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 21.921506][ T233] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
[ 21.921882][ T233] page dumped because: kasan: bad access detected
[ 21.922104][ T233]
[ 21.922204][ T233] Memory state around the buggy address:
[ 21.922379][ T233] ffff888009c34580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.922672][ T233] ffff888009c34600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.922997][ T233] >ffff888009c34680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.923269][ T233] ^
[ 21.923406][ T233] ffff888009c34700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.923646][ T233] ffff888009c34780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.923923][ T233] ==================================================================
[ 21.924210][ T233] Disabling lock debugging due to kernel taint
[ 21.924430][ T233] ------------[ cut here ]------------
[ 21.924581][ T233] refcount_t: underflow; use-after-free.
[ 21.924792][ T233] WARNING: CPU: 0 PID: 233 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 21.925119][ T233] Modules linked in:
[ 21.925266][ T233] CPU: 0 UID: 0 PID: 233 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.925696][ T233] Tainted: [B]=BAD_PAGE
[ 21.925850][ T233] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.926079][ T233] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 21.926324][ T233] 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 45 a3 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
[ 21.926960][ T233] RSP: 0018:ffffc90000a57ce8 EFLAGS: 00010282
[ 21.927212][ T233] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 21.927473][ T233] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 21.927723][ T233] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff47be134
[ 21.927994][ T233] R10: 0000000000000003 R11: ffffc90000a57880 R12: 0000000000000001
[ 21.928266][ T233] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 21.928526][ T233] FS: 000000000392d3c0(0000) GS:ffff88809101a000(0000) knlGS:0000000000000000
[ 21.928846][ T233] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.929068][ T233] CR2: 00007f0303208000 CR3: 0000000009f31001 CR4: 0000000000772ef0
[ 21.929326][ T233] PKRU: 55555554
[ 21.929461][ T233] Call Trace:
[ 21.929584][ T233]
[ 21.929669][ T233] netdev_run_todo+0x5f0/0xc60
[ 21.929866][ T233] ? rtnl_is_locked+0x15/0x20
[ 21.930058][ T233] ? netif_state_change+0x228/0x2c0
[ 21.930240][ T233] ? call_netdevice_notifiers_info+0x100/0x100
[ 21.930455][ T233] ? generic_xdp_install+0x410/0x410
[ 21.930614][ T233] ? tun_chr_close+0xae/0x1c0
[ 21.930810][ T233] tun_chr_close+0xc0/0x1c0
[ 21.931013][ T233] __fput+0x35c/0xa70
[ 21.931165][ T233] fput_close_sync+0xdd/0x1b0
[ 21.931335][ T233] ? alloc_file_clone+0xf0/0xf0
[ 21.931527][ T233] __x64_sys_close+0x7d/0xd0
[ 21.931690][ T233] do_syscall_64+0xc1/0xfd0
[ 21.931908][ T233] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.932162][ T233] RIP: 0033:0x4901eb
[ 21.932295][ T233] 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
[ 21.932960][ T233] RSP: 002b:00007ffd18bd8820 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 21.933260][ T233] RAX: ffffffffffffffda RBX: 00007ffd18bd8d80 RCX: 00000000004901eb
[ 21.933512][ T233] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 21.933770][ T233] RBP: 00007ffd18bd8860 R08: 0000000000000000 R09: 0000000000000000
[ 21.934050][ T233] R10: 0000000003934cf0 R11: 0000000000000293 R12: 00007ffd18bd8cf8
[ 21.934316][ T233] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 21.934603][ T233]
[ 21.934764][ T233] irq event stamp: 1109629
[ 21.934941][ T233] hardirqs last enabled at (1109629): [] irqentry_exit+0x3b/0x80
[ 21.935286][ T233] hardirqs last disabled at (1109628): [] handle_softirqs+0x47f/0x610
[ 21.935591][ T233] softirqs last enabled at (1109434): [] __tun_set_ebpf+0xc6/0x180
[ 21.935930][ T233] softirqs last disabled at (1109432): [] __tun_set_ebpf+0x91/0x180
[ 21.936245][ T233] ---[ end trace 0000000000000000 ]---