[ 18.794792][ T231] ==================================================================
[ 18.795237][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 18.795553][ T231] Read of size 1 at addr ffff88800a2b868c by task packetdrill/231
[ 18.795914][ T231]
[ 18.796045][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 18.796052][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.796056][ T231] Call Trace:
[ 18.796058][ T231]
[ 18.796061][ T231] dump_stack_lvl+0x82/0xc0
[ 18.796069][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 18.796077][ T231] ? kobject_put+0xbb/0xd0
[ 18.796083][ T231] print_report+0xb4/0x270
[ 18.796088][ T231] ? kobject_put+0xbb/0xd0
[ 18.796092][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 18.796098][ T231] ? kobject_put+0xbb/0xd0
[ 18.796102][ T231] kasan_report+0xca/0x100
[ 18.796108][ T231] ? kobject_put+0xbb/0xd0
[ 18.796117][ T231] kobject_put+0xbb/0xd0
[ 18.796122][ T231] netdev_run_todo+0x5f0/0xc60
[ 18.796129][ T231] ? rtnl_is_locked+0x15/0x20
[ 18.796134][ T231] ? netif_state_change+0x228/0x2c0
[ 18.796138][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 18.796143][ T231] ? generic_xdp_install+0x410/0x410
[ 18.796149][ T231] ? tun_chr_close+0xae/0x1c0
[ 18.796158][ T231] tun_chr_close+0xc0/0x1c0
[ 18.796164][ T231] __fput+0x35c/0xa70
[ 18.796174][ T231] fput_close_sync+0xdd/0x1b0
[ 18.796179][ T231] ? alloc_file_clone+0xf0/0xf0
[ 18.796188][ T231] __x64_sys_close+0x7d/0xd0
[ 18.796193][ T231] do_syscall_64+0xc1/0xfd0
[ 18.796200][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 18.796205][ T231] RIP: 0033:0x4901eb
[ 18.796211][ 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
[ 18.796216][ T231] RSP: 002b:00007ffc5316fce0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 18.796221][ T231] RAX: ffffffffffffffda RBX: 00007ffc53170240 RCX: 00000000004901eb
[ 18.796224][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 18.796226][ T231] RBP: 00007ffc5316fd20 R08: 0000000000000000 R09: 0000000000000000
[ 18.796229][ T231] R10: 0000000002000000 R11: 0000000000000293 R12: 00007ffc531701b8
[ 18.796231][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 18.796243][ T231]
[ 18.796245][ T231]
[ 18.805851][ T231] The buggy address belongs to the physical page:
[ 18.806141][ T231] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800a2b8700 pfn:0xa2b8
[ 18.806613][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 18.806862][ T231] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 18.807281][ T231] raw: ffff88800a2b8700 0000000000000000 00000001ffffffff 0000000000000000
[ 18.807688][ T231] page dumped because: kasan: bad access detected
[ 18.807969][ T231]
[ 18.808093][ T231] Memory state around the buggy address:
[ 18.808267][ T231] ffff88800a2b8580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.808522][ T231] ffff88800a2b8600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.808816][ T231] >ffff88800a2b8680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.809144][ T231] ^
[ 18.809324][ T231] ffff88800a2b8700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.809657][ T231] ffff88800a2b8780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.809988][ T231] ==================================================================
[ 18.810355][ T231] Disabling lock debugging due to kernel taint
[ 18.810633][ T231] ------------[ cut here ]------------
[ 18.810875][ T231] refcount_t: underflow; use-after-free.
[ 18.811415][ T231] WARNING: CPU: 0 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 18.811821][ T231] Modules linked in:
[ 18.811999][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 18.812548][ T231] Tainted: [B]=BAD_PAGE
[ 18.812722][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.813006][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 18.813318][ 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 85 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
[ 18.814155][ T231] RSP: 0018:ffffc90000a67ce8 EFLAGS: 00010282
[ 18.814450][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 18.814794][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 18.815146][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0bfe134
[ 18.815489][ T231] R10: 0000000000000003 R11: ffffc90000a67880 R12: 0000000000000001
[ 18.815834][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 18.816179][ T231] FS: 0000000029d053c0(0000) GS:ffff8880aee1a000(0000) knlGS:0000000000000000
[ 18.816579][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 18.816865][ T231] CR2: 00007f7da3b74000 CR3: 0000000005754005 CR4: 0000000000772ef0
[ 18.817220][ T231] PKRU: 55555554
[ 18.817432][ T231] Call Trace:
[ 18.817616][ T231]
[ 18.817741][ T231] netdev_run_todo+0x5f0/0xc60
[ 18.817986][ T231] ? rtnl_is_locked+0x15/0x20
[ 18.818239][ T231] ? netif_state_change+0x228/0x2c0
[ 18.818488][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 18.818763][ T231] ? generic_xdp_install+0x410/0x410
[ 18.818996][ T231] ? tun_chr_close+0xae/0x1c0
[ 18.819212][ T231] tun_chr_close+0xc0/0x1c0
[ 18.819364][ T231] __fput+0x35c/0xa70
[ 18.819490][ T231] fput_close_sync+0xdd/0x1b0
[ 18.819665][ T231] ? alloc_file_clone+0xf0/0xf0
[ 18.819879][ T231] __x64_sys_close+0x7d/0xd0
[ 18.820112][ T231] do_syscall_64+0xc1/0xfd0
[ 18.820353][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 18.820626][ T231] RIP: 0033:0x4901eb
[ 18.820807][ 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
[ 18.821657][ T231] RSP: 002b:00007ffc5316fce0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 18.822012][ T231] RAX: ffffffffffffffda RBX: 00007ffc53170240 RCX: 00000000004901eb
[ 18.822386][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 18.822725][ T231] RBP: 00007ffc5316fd20 R08: 0000000000000000 R09: 0000000000000000
[ 18.823071][ T231] R10: 0000000002000000 R11: 0000000000000293 R12: 00007ffc531701b8
[ 18.823421][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 18.823763][ T231]
[ 18.823934][ T231] irq event stamp: 1065395
[ 18.824165][ T231] hardirqs last enabled at (1065395): [] irqentry_exit+0x3b/0x80
[ 18.824564][ T231] hardirqs last disabled at (1065394): [] handle_softirqs+0x47f/0x610
[ 18.824954][ T231] softirqs last enabled at (1065204): [] __tun_set_ebpf+0xc6/0x180
[ 18.825351][ T231] softirqs last disabled at (1065202): [] __tun_set_ebpf+0x91/0x180
[ 18.825734][ T231] ---[ end trace 0000000000000000 ]---