[ 18.022228][ T231] ==================================================================
[ 18.022571][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 18.022811][ T231] Read of size 1 at addr ffff888008cb868c by task packetdrill/231
[ 18.023045][ T231]
[ 18.023137][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 18.023144][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.023148][ T231] Call Trace:
[ 18.023155][ T231]
[ 18.023157][ T231] dump_stack_lvl+0x82/0xc0
[ 18.023166][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 18.023182][ T231] ? kobject_put+0xbb/0xd0
[ 18.023187][ T231] print_report+0xb4/0x270
[ 18.023190][ T231] ? kobject_put+0xbb/0xd0
[ 18.023193][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 18.023197][ T231] ? kobject_put+0xbb/0xd0
[ 18.023201][ T231] kasan_report+0xca/0x100
[ 18.023205][ T231] ? kobject_put+0xbb/0xd0
[ 18.023210][ T231] kobject_put+0xbb/0xd0
[ 18.023214][ T231] netdev_run_todo+0x5f0/0xc60
[ 18.023226][ T231] ? rtnl_is_locked+0x15/0x20
[ 18.023232][ T231] ? netif_state_change+0x228/0x2c0
[ 18.023235][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 18.023237][ T231] ? generic_xdp_install+0x410/0x410
[ 18.023244][ T231] ? tun_chr_close+0xae/0x1c0
[ 18.023260][ T231] tun_chr_close+0xc0/0x1c0
[ 18.023263][ T231] __fput+0x35c/0xa70
[ 18.023273][ T231] fput_close_sync+0xdd/0x1b0
[ 18.023278][ T231] ? alloc_file_clone+0xf0/0xf0
[ 18.023282][ T231] __x64_sys_close+0x7d/0xd0
[ 18.023288][ T231] do_syscall_64+0xc1/0xfd0
[ 18.023300][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 18.023312][ T231] RIP: 0033:0x4901eb
[ 18.023320][ 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
[ 18.023323][ T231] RSP: 002b:00007ffcd0a3eda0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 18.023332][ T231] RAX: ffffffffffffffda RBX: 00007ffcd0a3f300 RCX: 00000000004901eb
[ 18.023335][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 18.023337][ T231] RBP: 00007ffcd0a3ede0 R08: 0000000000000000 R09: 0000000000000000
[ 18.023339][ T231] R10: 000000002329c690 R11: 0000000000000293 R12: 00007ffcd0a3f278
[ 18.023340][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 18.023347][ T231]
[ 18.023348][ T231]
[ 18.030213][ T231] The buggy address belongs to the physical page:
[ 18.030419][ T231] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888008cb8040 pfn:0x8cb8
[ 18.030757][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 18.030939][ T231] raw: 0080000000000000 ffffea000008d608 ffff88803623bc40 0000000000000000
[ 18.031264][ T231] raw: ffff888008cb8040 0000000000000000 00000000ffffffff 0000000000000000
[ 18.031596][ T231] page dumped because: kasan: bad access detected
[ 18.031802][ T231]
[ 18.031888][ T231] Memory state around the buggy address:
[ 18.032052][ T231] ffff888008cb8580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.032309][ T231] ffff888008cb8600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.032555][ T231] >ffff888008cb8680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.032786][ T231] ^
[ 18.032905][ T231] ffff888008cb8700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.033168][ T231] ffff888008cb8780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.033412][ T231] ==================================================================
[ 18.033690][ T231] Disabling lock debugging due to kernel taint
[ 18.033889][ T231] ------------[ cut here ]------------
[ 18.034054][ T231] refcount_t: underflow; use-after-free.
[ 18.034313][ T231] WARNING: CPU: 0 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 18.034617][ T231] Modules linked in:
[ 18.034748][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 18.035161][ T231] Tainted: [B]=BAD_PAGE
[ 18.035288][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.035499][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 18.035728][ 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 e5 9b 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
[ 18.036336][ T231] RSP: 0018:ffffc90000b47ce8 EFLAGS: 00010282
[ 18.036546][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 18.036784][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 18.037008][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff38fe134
[ 18.037389][ T231] R10: 0000000000000003 R11: ffffc90000b47880 R12: 0000000000000001
[ 18.037679][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 18.037926][ T231] FS: 00000000232963c0(0000) GS:ffff88809861a000(0000) knlGS:0000000000000000
[ 18.038245][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 18.038456][ T231] CR2: 00007f4b604a2000 CR3: 0000000009abf006 CR4: 0000000000772ef0
[ 18.038702][ T231] PKRU: 55555554
[ 18.038837][ T231] Call Trace:
[ 18.038955][ T231]
[ 18.039061][ T231] netdev_run_todo+0x5f0/0xc60
[ 18.039246][ T231] ? rtnl_is_locked+0x15/0x20
[ 18.039418][ T231] ? netif_state_change+0x228/0x2c0
[ 18.039578][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 18.039767][ T231] ? generic_xdp_install+0x410/0x410
[ 18.039932][ T231] ? tun_chr_close+0xae/0x1c0
[ 18.040116][ T231] tun_chr_close+0xc0/0x1c0
[ 18.040277][ T231] __fput+0x35c/0xa70
[ 18.040421][ T231] fput_close_sync+0xdd/0x1b0
[ 18.040582][ T231] ? alloc_file_clone+0xf0/0xf0
[ 18.040734][ T231] __x64_sys_close+0x7d/0xd0
[ 18.040919][ T231] do_syscall_64+0xc1/0xfd0
[ 18.041095][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 18.041426][ T231] RIP: 0033:0x4901eb
[ 18.041562][ 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
[ 18.042280][ T231] RSP: 002b:00007ffcd0a3eda0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 18.042524][ T231] RAX: ffffffffffffffda RBX: 00007ffcd0a3f300 RCX: 00000000004901eb
[ 18.042763][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 18.043135][ T231] RBP: 00007ffcd0a3ede0 R08: 0000000000000000 R09: 0000000000000000
[ 18.043395][ T231] R10: 000000002329c690 R11: 0000000000000293 R12: 00007ffcd0a3f278
[ 18.043741][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 18.043998][ T231]
[ 18.044151][ T231] irq event stamp: 992027
[ 18.044268][ T231] hardirqs last enabled at (992027): [] irqentry_exit+0x3b/0x80
[ 18.044643][ T231] hardirqs last disabled at (992026): [] handle_softirqs+0x47f/0x610
[ 18.044933][ T231] softirqs last enabled at (991926): [] handle_softirqs+0x352/0x610
[ 18.045319][ T231] softirqs last disabled at (991919): [] irq_exit_rcu+0xab/0x100
[ 18.045596][ T231] ---[ end trace 0000000000000000 ]---