[ 21.148974][ T233] ==================================================================
[ 21.149352][ T233] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 21.149562][ T233] Read of size 1 at addr ffff8880087e868c by task packetdrill/233
[ 21.149791][ T233]
[ 21.149877][ T233] CPU: 0 UID: 0 PID: 233 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.149883][ T233] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.149885][ T233] Call Trace:
[ 21.149888][ T233]
[ 21.149890][ T233] dump_stack_lvl+0x82/0xc0
[ 21.149896][ T233] print_address_description.constprop.0+0x2c/0x3a0
[ 21.149904][ T233] ? kobject_put+0xbb/0xd0
[ 21.149908][ T233] print_report+0xb4/0x270
[ 21.149911][ T233] ? kobject_put+0xbb/0xd0
[ 21.149915][ T233] ? kasan_addr_to_slab+0x21/0x70
[ 21.149918][ T233] ? kobject_put+0xbb/0xd0
[ 21.149921][ T233] kasan_report+0xca/0x100
[ 21.149925][ T233] ? kobject_put+0xbb/0xd0
[ 21.149931][ T233] kobject_put+0xbb/0xd0
[ 21.149934][ T233] netdev_run_todo+0x5f0/0xc60
[ 21.149940][ T233] ? rtnl_is_locked+0x15/0x20
[ 21.149944][ T233] ? netif_state_change+0x228/0x2c0
[ 21.149947][ T233] ? call_netdevice_notifiers_info+0x100/0x100
[ 21.149950][ T233] ? generic_xdp_install+0x410/0x410
[ 21.149954][ T233] ? tun_chr_close+0xae/0x1c0
[ 21.149962][ T233] tun_chr_close+0xc0/0x1c0
[ 21.149966][ T233] __fput+0x35c/0xa70
[ 21.149974][ T233] fput_close_sync+0xdd/0x1b0
[ 21.149977][ T233] ? alloc_file_clone+0xf0/0xf0
[ 21.149982][ T233] __x64_sys_close+0x7d/0xd0
[ 21.149986][ T233] do_syscall_64+0xc1/0xfd0
[ 21.149992][ T233] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.149996][ T233] RIP: 0033:0x4901eb
[ 21.150001][ T233] 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
[ 21.150003][ T233] RSP: 002b:00007ffd016c2e90 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 21.150008][ T233] RAX: ffffffffffffffda RBX: 00007ffd016c33f0 RCX: 00000000004901eb
[ 21.150012][ T233] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 21.150014][ T233] RBP: 00007ffd016c2ed0 R08: 0000000000000000 R09: 0000000000000000
[ 21.150016][ T233] R10: 0000000000000010 R11: 0000000000000293 R12: 00007ffd016c3368
[ 21.150020][ T233] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 21.150029][ T233]
[ 21.150032][ T233]
[ 21.156437][ T233] The buggy address belongs to the physical page:
[ 21.156634][ T233] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880087ebd00 pfn:0x87e8
[ 21.156953][ T233] flags: 0x80000000000000(node=0|zone=1)
[ 21.157117][ T233] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 21.157399][ T233] raw: ffff8880087ebd00 0000000000000000 00000001ffffffff 0000000000000000
[ 21.157675][ T233] page dumped because: kasan: bad access detected
[ 21.157870][ T233]
[ 21.157949][ T233] Memory state around the buggy address:
[ 21.158102][ T233] ffff8880087e8580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.158330][ T233] ffff8880087e8600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.158570][ T233] >ffff8880087e8680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.158794][ T233] ^
[ 21.158911][ T233] ffff8880087e8700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.159137][ T233] ffff8880087e8780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.159357][ T233] ==================================================================
[ 21.159612][ T233] Disabling lock debugging due to kernel taint
[ 21.159803][ T233] ------------[ cut here ]------------
[ 21.159945][ T233] refcount_t: underflow; use-after-free.
[ 21.160124][ T233] WARNING: CPU: 0 PID: 233 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 21.160404][ T233] Modules linked in:
[ 21.160529][ T233] CPU: 0 UID: 0 PID: 233 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.160877][ T233] Tainted: [B]=BAD_PAGE
[ 21.160992][ T233] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.161184][ T233] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 21.161380][ T233] 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 a5 85 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
[ 21.161935][ T233] RSP: 0018:ffffc90000ad7ce8 EFLAGS: 00010282
[ 21.162131][ T233] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 21.162357][ T233] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 21.162593][ T233] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0c7e134
[ 21.162828][ T233] R10: 0000000000000003 R11: ffffc90000ad7880 R12: 0000000000000001
[ 21.163056][ T233] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 21.163285][ T233] FS: 0000000007cbc3c0(0000) GS:ffff8880aea1a000(0000) knlGS:0000000000000000
[ 21.163559][ T233] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.163755][ T233] CR2: 00007f0d75787000 CR3: 0000000008c4b006 CR4: 0000000000772ef0
[ 21.163986][ T233] PKRU: 55555554
[ 21.164100][ T233] Call Trace:
[ 21.164214][ T233]
[ 21.164295][ T233] netdev_run_todo+0x5f0/0xc60
[ 21.164459][ T233] ? rtnl_is_locked+0x15/0x20
[ 21.164685][ T233] ? netif_state_change+0x228/0x2c0
[ 21.164842][ T233] ? call_netdevice_notifiers_info+0x100/0x100
[ 21.165031][ T233] ? generic_xdp_install+0x410/0x410
[ 21.165214][ T233] ? tun_chr_close+0xae/0x1c0
[ 21.165372][ T233] tun_chr_close+0xc0/0x1c0
[ 21.165555][ T233] __fput+0x35c/0xa70
[ 21.165676][ T233] fput_close_sync+0xdd/0x1b0
[ 21.165826][ T233] ? alloc_file_clone+0xf0/0xf0
[ 21.165986][ T233] __x64_sys_close+0x7d/0xd0
[ 21.166170][ T233] do_syscall_64+0xc1/0xfd0
[ 21.166327][ T233] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.166538][ T233] RIP: 0033:0x4901eb
[ 21.166669][ T233] 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
[ 21.167221][ T233] RSP: 002b:00007ffd016c2e90 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 21.167464][ T233] RAX: ffffffffffffffda RBX: 00007ffd016c33f0 RCX: 00000000004901eb
[ 21.167698][ T233] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 21.167928][ T233] RBP: 00007ffd016c2ed0 R08: 0000000000000000 R09: 0000000000000000
[ 21.168156][ T233] R10: 0000000000000010 R11: 0000000000000293 R12: 00007ffd016c3368
[ 21.168399][ T233] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 21.168631][ T233]
[ 21.168749][ T233] irq event stamp: 2015493
[ 21.168910][ T233] hardirqs last enabled at (2015493): [] irqentry_exit+0x3b/0x80
[ 21.169207][ T233] hardirqs last disabled at (2015492): [] handle_softirqs+0x47f/0x610
[ 21.169498][ T233] softirqs last enabled at (2015304): [] __tun_set_ebpf+0xc6/0x180
[ 21.169777][ T233] softirqs last disabled at (2015302): [] __tun_set_ebpf+0x91/0x180
[ 21.170056][ T233] ---[ end trace 0000000000000000 ]---
[ 21.177047][ T233] packetdrill (233) used greatest stack depth: 23984 bytes left