[ 20.758707][ T231] ==================================================================
[ 20.759220][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 20.759616][ T231] Read of size 1 at addr ffff88800592c68c by task packetdrill/231
[ 20.760033][ T231]
[ 20.760185][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.760193][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.760197][ T231] Call Trace:
[ 20.760200][ T231]
[ 20.760203][ T231] dump_stack_lvl+0x82/0xc0
[ 20.760210][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 20.760220][ T231] ? kobject_put+0xbb/0xd0
[ 20.760226][ T231] print_report+0xb4/0x270
[ 20.760232][ T231] ? kobject_put+0xbb/0xd0
[ 20.760237][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 20.760242][ T231] ? kobject_put+0xbb/0xd0
[ 20.760247][ T231] kasan_report+0xca/0x100
[ 20.760254][ T231] ? kobject_put+0xbb/0xd0
[ 20.760264][ T231] kobject_put+0xbb/0xd0
[ 20.760270][ T231] netdev_run_todo+0x5f0/0xc60
[ 20.760277][ T231] ? rtnl_is_locked+0x15/0x20
[ 20.760282][ T231] ? netif_state_change+0x228/0x2c0
[ 20.760287][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 20.760293][ T231] ? generic_xdp_install+0x410/0x410
[ 20.760300][ T231] ? tun_chr_close+0xae/0x1c0
[ 20.760312][ T231] tun_chr_close+0xc0/0x1c0
[ 20.760318][ T231] __fput+0x35c/0xa70
[ 20.760329][ T231] fput_close_sync+0xdd/0x1b0
[ 20.760334][ T231] ? alloc_file_clone+0xf0/0xf0
[ 20.760342][ T231] __x64_sys_close+0x7d/0xd0
[ 20.760347][ T231] do_syscall_64+0xc1/0xfd0
[ 20.760354][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.760360][ T231] RIP: 0033:0x4901eb
[ 20.760365][ 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
[ 20.760369][ T231] RSP: 002b:00007ffd54ddff50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 20.760375][ T231] RAX: ffffffffffffffda RBX: 00007ffd54de04b0 RCX: 00000000004901eb
[ 20.760379][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 20.760382][ T231] RBP: 00007ffd54ddff90 R08: 0000000000000000 R09: 0000000000000000
[ 20.760385][ T231] R10: 0000000000000080 R11: 0000000000000293 R12: 00007ffd54de0428
[ 20.760388][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 20.760400][ T231]
[ 20.760402][ T231]
[ 20.772048][ T231] The buggy address belongs to the physical page:
[ 20.772421][ T231] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x592c
[ 20.772944][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 20.773253][ T231] raw: 0080000000000000 ffffea0000155408 ffff88803623bc40 0000000000000000
[ 20.773779][ T231] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 20.774304][ T231] page dumped because: kasan: bad access detected
[ 20.774675][ T231]
[ 20.774823][ T231] Memory state around the buggy address:
[ 20.775109][ T231] ffff88800592c580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.775545][ T231] ffff88800592c600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.775969][ T231] >ffff88800592c680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.776402][ T231] ^
[ 20.776621][ T231] ffff88800592c700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.777041][ T231] ffff88800592c780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.777470][ T231] ==================================================================
[ 20.778164][ T231] Disabling lock debugging due to kernel taint
[ 20.778541][ T231] ------------[ cut here ]------------
[ 20.778808][ T231] refcount_t: underflow; use-after-free.
[ 20.779122][ T231] WARNING: CPU: 0 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 20.779685][ T231] Modules linked in:
[ 20.779915][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.780594][ T231] Tainted: [B]=BAD_PAGE
[ 20.780808][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.781168][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 20.781568][ 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 05 93 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
[ 20.782654][ T231] RSP: 0018:ffffc90000a97ce8 EFLAGS: 00010282
[ 20.783016][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 20.783470][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 20.783893][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff273e134
[ 20.784311][ T231] R10: 0000000000000003 R11: ffffc90000a97880 R12: 0000000000000001
[ 20.784750][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 20.785178][ T231] FS: 00000000146dd3c0(0000) GS:ffff8880a141a000(0000) knlGS:0000000000000000
[ 20.785702][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 20.786059][ T231] CR2: 00007f89b1fa5000 CR3: 000000000c213001 CR4: 0000000000772ef0
[ 20.786504][ T231] PKRU: 55555554
[ 20.786717][ T231] Call Trace:
[ 20.786933][ T231]
[ 20.787077][ T231] netdev_run_todo+0x5f0/0xc60
[ 20.787394][ T231] ? rtnl_is_locked+0x15/0x20
[ 20.787682][ T231] ? netif_state_change+0x228/0x2c0
[ 20.787962][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 20.788300][ T231] ? generic_xdp_install+0x410/0x410
[ 20.788603][ T231] ? tun_chr_close+0xae/0x1c0
[ 20.788887][ T231] tun_chr_close+0xc0/0x1c0
[ 20.789166][ T231] __fput+0x35c/0xa70
[ 20.789416][ T231] fput_close_sync+0xdd/0x1b0
[ 20.789695][ T231] ? alloc_file_clone+0xf0/0xf0
[ 20.789981][ T231] __x64_sys_close+0x7d/0xd0
[ 20.790254][ T231] do_syscall_64+0xc1/0xfd0
[ 20.790555][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.790910][ T231] RIP: 0033:0x4901eb
[ 20.791129][ 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
[ 20.792134][ T231] RSP: 002b:00007ffd54ddff50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 20.792579][ T231] RAX: ffffffffffffffda RBX: 00007ffd54de04b0 RCX: 00000000004901eb
[ 20.793001][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 20.793436][ T231] RBP: 00007ffd54ddff90 R08: 0000000000000000 R09: 0000000000000000
[ 20.793896][ T231] R10: 0000000000000080 R11: 0000000000000293 R12: 00007ffd54de0428
[ 20.794380][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 20.794829][ T231]
[ 20.795069][ T231] irq event stamp: 1956701
[ 20.795350][ T231] hardirqs last enabled at (1956701): [] irqentry_exit+0x3b/0x80
[ 20.795861][ T231] hardirqs last disabled at (1956700): [] handle_softirqs+0x47f/0x610
[ 20.796381][ T231] softirqs last enabled at (1956288): [] __tun_set_ebpf+0xc6/0x180
[ 20.796925][ T231] softirqs last disabled at (1956286): [] __tun_set_ebpf+0x91/0x180
[ 20.797432][ T231] ---[ end trace 0000000000000000 ]---