[ 20.472641][ T231] ==================================================================
[ 20.472983][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 20.473277][ T231] Read of size 1 at addr ffff88800843068c by task packetdrill/231
[ 20.473577][ T231]
[ 20.473672][ T231] CPU: 2 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.473677][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.473682][ T231] Call Trace:
[ 20.473686][ T231]
[ 20.473688][ T231] dump_stack_lvl+0x82/0xc0
[ 20.473698][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 20.473711][ T231] ? kobject_put+0xbb/0xd0
[ 20.473717][ T231] print_report+0xb4/0x270
[ 20.473722][ T231] ? kobject_put+0xbb/0xd0
[ 20.473726][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 20.473731][ T231] ? kobject_put+0xbb/0xd0
[ 20.473735][ T231] kasan_report+0xca/0x100
[ 20.473741][ T231] ? kobject_put+0xbb/0xd0
[ 20.473751][ T231] kobject_put+0xbb/0xd0
[ 20.473757][ T231] netdev_run_todo+0x5f0/0xc60
[ 20.473764][ T231] ? rtnl_is_locked+0x15/0x20
[ 20.473769][ T231] ? netif_state_change+0x228/0x2c0
[ 20.473774][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 20.473779][ T231] ? generic_xdp_install+0x410/0x410
[ 20.473786][ T231] ? tun_chr_close+0xae/0x1c0
[ 20.473803][ T231] tun_chr_close+0xc0/0x1c0
[ 20.473812][ T231] __fput+0x35c/0xa70
[ 20.473826][ T231] fput_close_sync+0xdd/0x1b0
[ 20.473831][ T231] ? alloc_file_clone+0xf0/0xf0
[ 20.473840][ T231] __x64_sys_close+0x7d/0xd0
[ 20.473846][ T231] do_syscall_64+0xc1/0xfd0
[ 20.473853][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.473860][ T231] RIP: 0033:0x4901eb
[ 20.473870][ 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
[ 20.473874][ T231] RSP: 002b:00007ffd4ec01440 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 20.473885][ T231] RAX: ffffffffffffffda RBX: 00007ffd4ec019a0 RCX: 00000000004901eb
[ 20.473889][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 20.473891][ T231] RBP: 00007ffd4ec01480 R08: 0000000000000000 R09: 0000000000000000
[ 20.473894][ T231] R10: 0000000002000000 R11: 0000000000000293 R12: 00007ffd4ec01918
[ 20.473897][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 20.473903][ T231]
[ 20.473904][ T231]
[ 20.481869][ T231] The buggy address belongs to the physical page:
[ 20.482131][ T231] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888008431600 pfn:0x8430
[ 20.482589][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 20.482878][ T231] raw: 0080000000000000 ffffea00002f5008 ffff88803633bc40 0000000000000000
[ 20.483224][ T231] raw: ffff888008431600 0000000000000000 00000000ffffffff 0000000000000000
[ 20.483577][ T231] page dumped because: kasan: bad access detected
[ 20.483874][ T231]
[ 20.483967][ T231] Memory state around the buggy address:
[ 20.484144][ T231] ffff888008430580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.484464][ T231] ffff888008430600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.484775][ T231] >ffff888008430680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.485100][ T231] ^
[ 20.485220][ T231] ffff888008430700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.485537][ T231] ffff888008430780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.485784][ T231] ==================================================================
[ 20.486106][ T231] Disabling lock debugging due to kernel taint
[ 20.486365][ T231] ------------[ cut here ]------------
[ 20.486578][ T231] refcount_t: underflow; use-after-free.
[ 20.486790][ T231] WARNING: CPU: 2 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 20.487184][ T231] Modules linked in:
[ 20.487372][ T231] CPU: 2 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.487895][ T231] Tainted: [B]=BAD_PAGE
[ 20.488049][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.488262][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 20.488557][ 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 8c 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
[ 20.489289][ T231] RSP: 0018:ffffc900009e7ce8 EFLAGS: 00010282
[ 20.489582][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 20.489890][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 20.490151][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff19fe134
[ 20.490423][ T231] R10: 0000000000000003 R11: ffffc900009e7880 R12: 0000000000000001
[ 20.490718][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 20.490993][ T231] FS: 000000001eaf03c0(0000) GS:ffff8880a7f1a000(0000) knlGS:0000000000000000
[ 20.491288][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 20.491587][ T231] CR2: 00007fef6f96d000 CR3: 0000000009f3f005 CR4: 0000000000772ef0
[ 20.491931][ T231] PKRU: 55555554
[ 20.492128][ T231] Call Trace:
[ 20.492311][ T231]
[ 20.492421][ T231] netdev_run_todo+0x5f0/0xc60
[ 20.492616][ T231] ? rtnl_is_locked+0x15/0x20
[ 20.492817][ T231] ? netif_state_change+0x228/0x2c0
[ 20.493036][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 20.493284][ T231] ? generic_xdp_install+0x410/0x410
[ 20.493475][ T231] ? tun_chr_close+0xae/0x1c0
[ 20.493683][ T231] tun_chr_close+0xc0/0x1c0
[ 20.493870][ T231] __fput+0x35c/0xa70
[ 20.494032][ T231] fput_close_sync+0xdd/0x1b0
[ 20.494240][ T231] ? alloc_file_clone+0xf0/0xf0
[ 20.494469][ T231] __x64_sys_close+0x7d/0xd0
[ 20.494709][ T231] do_syscall_64+0xc1/0xfd0
[ 20.494934][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.495193][ T231] RIP: 0033:0x4901eb
[ 20.495381][ 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
[ 20.496070][ T231] RSP: 002b:00007ffd4ec01440 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 20.496362][ T231] RAX: ffffffffffffffda RBX: 00007ffd4ec019a0 RCX: 00000000004901eb
[ 20.496627][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 20.496985][ T231] RBP: 00007ffd4ec01480 R08: 0000000000000000 R09: 0000000000000000
[ 20.497278][ T231] R10: 0000000002000000 R11: 0000000000000293 R12: 00007ffd4ec01918
[ 20.497568][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 20.497832][ T231]
[ 20.497979][ T231] irq event stamp: 1963613
[ 20.498165][ T231] hardirqs last enabled at (1963613): [] irqentry_exit+0x3b/0x80
[ 20.498518][ T231] hardirqs last disabled at (1963612): [] common_interrupt+0x19/0xe0
[ 20.498832][ T231] softirqs last enabled at (1963430): [] __tun_set_ebpf+0xc6/0x180
[ 20.499165][ T231] softirqs last disabled at (1963428): [] __tun_set_ebpf+0x91/0x180
[ 20.499490][ T231] ---[ end trace 0000000000000000 ]---