[ 18.424878][ T231] ==================================================================
[ 18.425284][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 18.425526][ T231] Read of size 1 at addr ffff88800bd3468c by task packetdrill/231
[ 18.425777][ T231]
[ 18.425872][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 18.425877][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.425882][ T231] Call Trace:
[ 18.425885][ T231]
[ 18.425887][ T231] dump_stack_lvl+0x82/0xc0
[ 18.425896][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 18.425913][ T231] ? kobject_put+0xbb/0xd0
[ 18.425917][ T231] print_report+0xb4/0x270
[ 18.425921][ T231] ? kobject_put+0xbb/0xd0
[ 18.425924][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 18.425927][ T231] ? kobject_put+0xbb/0xd0
[ 18.425930][ T231] kasan_report+0xca/0x100
[ 18.425935][ T231] ? kobject_put+0xbb/0xd0
[ 18.425940][ T231] kobject_put+0xbb/0xd0
[ 18.425944][ T231] netdev_run_todo+0x5f0/0xc60
[ 18.425954][ T231] ? rtnl_is_locked+0x15/0x20
[ 18.425960][ T231] ? netif_state_change+0x228/0x2c0
[ 18.425963][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 18.425965][ T231] ? generic_xdp_install+0x410/0x410
[ 18.425970][ T231] ? tun_chr_close+0xae/0x1c0
[ 18.425983][ T231] tun_chr_close+0xc0/0x1c0
[ 18.425986][ T231] __fput+0x35c/0xa70
[ 18.425996][ T231] fput_close_sync+0xdd/0x1b0
[ 18.425999][ T231] ? alloc_file_clone+0xf0/0xf0
[ 18.426004][ T231] __x64_sys_close+0x7d/0xd0
[ 18.426008][ T231] do_syscall_64+0xc1/0xfd0
[ 18.426014][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 18.426024][ T231] RIP: 0033:0x4901eb
[ 18.426033][ 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
[ 18.426036][ T231] RSP: 002b:00007ffe6c3d2e80 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 18.426044][ T231] RAX: ffffffffffffffda RBX: 00007ffe6c3d33e0 RCX: 00000000004901eb
[ 18.426046][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 18.426048][ T231] RBP: 00007ffe6c3d2ec0 R08: 0000000000000000 R09: 0000000000000000
[ 18.426050][ T231] R10: 0000000007fc04f0 R11: 0000000000000293 R12: 00007ffe6c3d3358
[ 18.426052][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 18.426058][ T231]
[ 18.426059][ T231]
[ 18.433475][ T231] The buggy address belongs to the physical page:
[ 18.433717][ T231] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88800bd35c00 pfn:0xbd34
[ 18.434082][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 18.434269][ T231] raw: 0080000000000000 ffffea0000156c08 ffff88803623bc40 0000000000000000
[ 18.434578][ T231] raw: ffff88800bd35c00 0000000000000000 00000000ffffffff 0000000000000000
[ 18.434884][ T231] page dumped because: kasan: bad access detected
[ 18.435105][ T231]
[ 18.435192][ T231] Memory state around the buggy address:
[ 18.435360][ T231] ffff88800bd34580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.435607][ T231] ffff88800bd34600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.435861][ T231] >ffff88800bd34680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.436120][ T231] ^
[ 18.436247][ T231] ffff88800bd34700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.436498][ T231] ffff88800bd34780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.436744][ T231] ==================================================================
[ 18.437030][ T231] Disabling lock debugging due to kernel taint
[ 18.437265][ T231] ------------[ cut here ]------------
[ 18.437424][ T231] refcount_t: underflow; use-after-free.
[ 18.437659][ T231] WARNING: CPU: 0 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 18.437961][ T231] Modules linked in:
[ 18.438112][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 18.438493][ T231] Tainted: [B]=BAD_PAGE
[ 18.438624][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.438834][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 18.439051][ 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 c5 98 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
[ 18.439656][ T231] RSP: 0018:ffffc90000767ce8 EFLAGS: 00010282
[ 18.439865][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 18.440123][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 18.440368][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff32be134
[ 18.440622][ T231] R10: 0000000000000003 R11: ffffc90000767880 R12: 0000000000000001
[ 18.440868][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 18.441126][ T231] FS: 0000000007fb83c0(0000) GS:ffff88809b81a000(0000) knlGS:0000000000000000
[ 18.441415][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 18.441629][ T231] CR2: 00007f8dac691000 CR3: 00000000058de006 CR4: 0000000000772ef0
[ 18.441877][ T231] PKRU: 55555554
[ 18.442002][ T231] Call Trace:
[ 18.442138][ T231]
[ 18.442224][ T231] netdev_run_todo+0x5f0/0xc60
[ 18.442396][ T231] ? rtnl_is_locked+0x15/0x20
[ 18.442561][ T231] ? netif_state_change+0x228/0x2c0
[ 18.442726][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 18.442932][ T231] ? generic_xdp_install+0x410/0x410
[ 18.443106][ T231] ? tun_chr_close+0xae/0x1c0
[ 18.443277][ T231] tun_chr_close+0xc0/0x1c0
[ 18.443446][ T231] __fput+0x35c/0xa70
[ 18.443577][ T231] fput_close_sync+0xdd/0x1b0
[ 18.443740][ T231] ? alloc_file_clone+0xf0/0xf0
[ 18.443906][ T231] __x64_sys_close+0x7d/0xd0
[ 18.444077][ T231] do_syscall_64+0xc1/0xfd0
[ 18.444252][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 18.444455][ T231] RIP: 0033:0x4901eb
[ 18.444593][ 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
[ 18.445191][ T231] RSP: 002b:00007ffe6c3d2e80 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 18.445448][ T231] RAX: ffffffffffffffda RBX: 00007ffe6c3d33e0 RCX: 00000000004901eb
[ 18.445698][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 18.445945][ T231] RBP: 00007ffe6c3d2ec0 R08: 0000000000000000 R09: 0000000000000000
[ 18.446199][ T231] R10: 0000000007fc04f0 R11: 0000000000000293 R12: 00007ffe6c3d3358
[ 18.446454][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 18.446702][ T231]
[ 18.446825][ T231] irq event stamp: 1913903
[ 18.446994][ T231] hardirqs last enabled at (1913903): [] irqentry_exit+0x3b/0x80
[ 18.447311][ T231] hardirqs last disabled at (1913902): [] handle_softirqs+0x47f/0x610
[ 18.447618][ T231] softirqs last enabled at (1913716): [] __tun_set_ebpf+0xc6/0x180
[ 18.447905][ T231] softirqs last disabled at (1913714): [] __tun_set_ebpf+0x91/0x180
[ 18.448201][ T231] ---[ end trace 0000000000000000 ]---