[ 16.226499][ T231] ==================================================================
[ 16.226823][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 16.227025][ T231] Read of size 1 at addr ffff88800b61868c by task packetdrill/231
[ 16.227257][ T231]
[ 16.227338][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.227343][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.227345][ T231] Call Trace:
[ 16.227347][ T231]
[ 16.227349][ T231] dump_stack_lvl+0x82/0xc0
[ 16.227354][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 16.227361][ T231] ? kobject_put+0xbb/0xd0
[ 16.227365][ T231] print_report+0xb4/0x270
[ 16.227369][ T231] ? kobject_put+0xbb/0xd0
[ 16.227372][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 16.227375][ T231] ? kobject_put+0xbb/0xd0
[ 16.227378][ T231] kasan_report+0xca/0x100
[ 16.227382][ T231] ? kobject_put+0xbb/0xd0
[ 16.227387][ T231] kobject_put+0xbb/0xd0
[ 16.227391][ T231] netdev_run_todo+0x5f0/0xc60
[ 16.227395][ T231] ? rtnl_is_locked+0x15/0x20
[ 16.227399][ T231] ? netif_state_change+0x228/0x2c0
[ 16.227402][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 16.227405][ T231] ? generic_xdp_install+0x410/0x410
[ 16.227409][ T231] ? tun_chr_close+0xae/0x1c0
[ 16.227415][ T231] tun_chr_close+0xc0/0x1c0
[ 16.227419][ T231] __fput+0x35c/0xa70
[ 16.227427][ T231] fput_close_sync+0xdd/0x1b0
[ 16.227430][ T231] ? alloc_file_clone+0xf0/0xf0
[ 16.227434][ T231] __x64_sys_close+0x7d/0xd0
[ 16.227438][ T231] do_syscall_64+0xc1/0xfd0
[ 16.227443][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.227447][ T231] RIP: 0033:0x4901eb
[ 16.227452][ 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
[ 16.227455][ T231] RSP: 002b:00007ffcfa3fbf00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 16.227459][ T231] RAX: ffffffffffffffda RBX: 00007ffcfa3fc460 RCX: 00000000004901eb
[ 16.227461][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 16.227462][ T231] RBP: 00007ffcfa3fbf40 R08: 0000000000000000 R09: 0000000000000000
[ 16.227464][ T231] R10: 0000000026d85950 R11: 0000000000000293 R12: 00007ffcfa3fc3d8
[ 16.227466][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 16.227472][ T231]
[ 16.227473][ T231]
[ 16.233900][ T231] The buggy address belongs to the physical page:
[ 16.234100][ T231] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88800b61a340 pfn:0xb618
[ 16.234432][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 16.234616][ T231] raw: 0080000000000000 ffffea00002e5508 ffff88803623bc40 0000000000000000
[ 16.234908][ T231] raw: ffff88800b61a340 0000000000000000 00000000ffffffff 0000000000000000
[ 16.235190][ T231] page dumped because: kasan: bad access detected
[ 16.235400][ T231]
[ 16.235478][ T231] Memory state around the buggy address:
[ 16.235641][ T231] ffff88800b618580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.235887][ T231] ffff88800b618600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.236124][ T231] >ffff88800b618680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.236371][ T231] ^
[ 16.236497][ T231] ffff88800b618700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.236755][ T231] ffff88800b618780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.236993][ T231] ==================================================================
[ 16.237264][ T231] Disabling lock debugging due to kernel taint
[ 16.237457][ T231] ------------[ cut here ]------------
[ 16.237604][ T231] refcount_t: underflow; use-after-free.
[ 16.237785][ T231] WARNING: CPU: 0 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.238147][ T231] Modules linked in:
[ 16.238273][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.238627][ T231] Tainted: [B]=BAD_PAGE
[ 16.238754][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.238956][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.239169][ 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 45 8e 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
[ 16.239721][ T231] RSP: 0018:ffffc90000a57ce8 EFLAGS: 00010282
[ 16.239928][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.240194][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.240431][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1dbe134
[ 16.240669][ T231] R10: 0000000000000003 R11: ffffc90000a57880 R12: 0000000000000001
[ 16.240927][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.241185][ T231] FS: 0000000026d723c0(0000) GS:ffff8880a601a000(0000) knlGS:0000000000000000
[ 16.241489][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.241713][ T231] CR2: 00007f97506ca000 CR3: 0000000005290004 CR4: 0000000000772ef0
[ 16.241980][ T231] PKRU: 55555554
[ 16.242114][ T231] Call Trace:
[ 16.242255][ T231]
[ 16.242345][ T231] netdev_run_todo+0x5f0/0xc60
[ 16.242519][ T231] ? rtnl_is_locked+0x15/0x20
[ 16.242688][ T231] ? netif_state_change+0x228/0x2c0
[ 16.242867][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 16.243085][ T231] ? generic_xdp_install+0x410/0x410
[ 16.243365][ T231] ? tun_chr_close+0xae/0x1c0
[ 16.243543][ T231] tun_chr_close+0xc0/0x1c0
[ 16.243717][ T231] __fput+0x35c/0xa70
[ 16.243851][ T231] fput_close_sync+0xdd/0x1b0
[ 16.244111][ T231] ? alloc_file_clone+0xf0/0xf0
[ 16.244284][ T231] __x64_sys_close+0x7d/0xd0
[ 16.244464][ T231] do_syscall_64+0xc1/0xfd0
[ 16.244633][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.244933][ T231] RIP: 0033:0x4901eb
[ 16.245068][ 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
[ 16.245770][ T231] RSP: 002b:00007ffcfa3fbf00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 16.246034][ T231] RAX: ffffffffffffffda RBX: 00007ffcfa3fc460 RCX: 00000000004901eb
[ 16.246307][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 16.246658][ T231] RBP: 00007ffcfa3fbf40 R08: 0000000000000000 R09: 0000000000000000
[ 16.246899][ T231] R10: 0000000026d85950 R11: 0000000000000293 R12: 00007ffcfa3fc3d8
[ 16.247222][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 16.247467][ T231]
[ 16.247587][ T231] irq event stamp: 1688415
[ 16.247747][ T231] hardirqs last enabled at (1688415): [] irqentry_exit+0x3b/0x80
[ 16.248113][ T231] hardirqs last disabled at (1688414): [] handle_softirqs+0x47f/0x610
[ 16.248385][ T231] softirqs last enabled at (1688226): [] __tun_set_ebpf+0xc6/0x180
[ 16.248751][ T231] softirqs last disabled at (1688224): [] __tun_set_ebpf+0x91/0x180
[ 16.249019][ T231] ---[ end trace 0000000000000000 ]---