[ 16.473885][ T231] ==================================================================
[ 16.474188][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 16.474410][ T231] Read of size 1 at addr ffff888004c9068c by task packetdrill/231
[ 16.474663][ T231]
[ 16.474754][ T231] CPU: 3 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.474759][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.474762][ T231] Call Trace:
[ 16.474764][ T231]
[ 16.474766][ T231] dump_stack_lvl+0x82/0xc0
[ 16.474772][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 16.474781][ T231] ? kobject_put+0xbb/0xd0
[ 16.474785][ T231] print_report+0xb4/0x270
[ 16.474788][ T231] ? kobject_put+0xbb/0xd0
[ 16.474791][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 16.474795][ T231] ? kobject_put+0xbb/0xd0
[ 16.474799][ T231] kasan_report+0xca/0x100
[ 16.474803][ T231] ? kobject_put+0xbb/0xd0
[ 16.474808][ T231] kobject_put+0xbb/0xd0
[ 16.474812][ T231] netdev_run_todo+0x5f0/0xc60
[ 16.474817][ T231] ? rtnl_is_locked+0x15/0x20
[ 16.474821][ T231] ? netif_state_change+0x228/0x2c0
[ 16.474824][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 16.474827][ T231] ? generic_xdp_install+0x410/0x410
[ 16.474831][ T231] ? tun_chr_close+0xae/0x1c0
[ 16.474839][ T231] tun_chr_close+0xc0/0x1c0
[ 16.474843][ T231] __fput+0x35c/0xa70
[ 16.474852][ T231] fput_close_sync+0xdd/0x1b0
[ 16.474855][ T231] ? alloc_file_clone+0xf0/0xf0
[ 16.474860][ T231] __x64_sys_close+0x7d/0xd0
[ 16.474864][ T231] do_syscall_64+0xc1/0xfd0
[ 16.474870][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.474875][ T231] RIP: 0033:0x4901eb
[ 16.474879][ 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
[ 16.474883][ T231] RSP: 002b:00007fffe746a5f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 16.474887][ T231] RAX: ffffffffffffffda RBX: 00007fffe746ab50 RCX: 00000000004901eb
[ 16.474889][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 16.474892][ T231] RBP: 00007fffe746a630 R08: 0000000000000000 R09: 0000000000000000
[ 16.474893][ T231] R10: 0000000000100000 R11: 0000000000000293 R12: 00007fffe746aac8
[ 16.474895][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 16.474902][ T231]
[ 16.474903][ T231]
[ 16.481822][ T231] The buggy address belongs to the physical page:
[ 16.482029][ T231] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888004c92800 pfn:0x4c90
[ 16.482375][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 16.482552][ T231] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 16.482865][ T231] raw: ffff888004c92800 0000000000000000 00000001ffffffff 0000000000000000
[ 16.483165][ T231] page dumped because: kasan: bad access detected
[ 16.483387][ T231]
[ 16.483471][ T231] Memory state around the buggy address:
[ 16.483638][ T231] ffff888004c90580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.483890][ T231] ffff888004c90600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.484132][ T231] >ffff888004c90680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.484381][ T231] ^
[ 16.484506][ T231] ffff888004c90700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.484750][ T231] ffff888004c90780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.485000][ T231] ==================================================================
[ 16.485261][ T231] Disabling lock debugging due to kernel taint
[ 16.485469][ T231] ------------[ cut here ]------------
[ 16.485627][ T231] refcount_t: underflow; use-after-free.
[ 16.485824][ T231] WARNING: CPU: 3 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.486125][ T231] Modules linked in:
[ 16.486264][ T231] CPU: 3 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.486637][ T231] Tainted: [B]=BAD_PAGE
[ 16.486764][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.486973][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.487190][ 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
[ 16.487787][ T231] RSP: 0018:ffffc90000ae7ce8 EFLAGS: 00010282
[ 16.487998][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.488254][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.488500][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff32be134
[ 16.488745][ T231] R10: 0000000000000003 R11: ffffc90000ae7880 R12: 0000000000000001
[ 16.488993][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.489255][ T231] FS: 00000000246ce3c0(0000) GS:ffff88809b99a000(0000) knlGS:0000000000000000
[ 16.489542][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.489747][ T231] CR2: 00007f85ca474a20 CR3: 00000000024b2003 CR4: 0000000000772ef0
[ 16.489994][ T231] PKRU: 55555554
[ 16.490120][ T231] Call Trace:
[ 16.490248][ T231]
[ 16.490337][ T231] netdev_run_todo+0x5f0/0xc60
[ 16.490511][ T231] ? rtnl_is_locked+0x15/0x20
[ 16.490687][ T231] ? netif_state_change+0x228/0x2c0
[ 16.490852][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 16.491054][ T231] ? generic_xdp_install+0x410/0x410
[ 16.491224][ T231] ? tun_chr_close+0xae/0x1c0
[ 16.491393][ T231] tun_chr_close+0xc0/0x1c0
[ 16.491558][ T231] __fput+0x35c/0xa70
[ 16.491690][ T231] fput_close_sync+0xdd/0x1b0
[ 16.491855][ T231] ? alloc_file_clone+0xf0/0xf0
[ 16.492020][ T231] __x64_sys_close+0x7d/0xd0
[ 16.492184][ T231] do_syscall_64+0xc1/0xfd0
[ 16.492357][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.492559][ T231] RIP: 0033:0x4901eb
[ 16.492690][ 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
[ 16.493293][ T231] RSP: 002b:00007fffe746a5f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 16.493542][ T231] RAX: ffffffffffffffda RBX: 00007fffe746ab50 RCX: 00000000004901eb
[ 16.493789][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 16.494041][ T231] RBP: 00007fffe746a630 R08: 0000000000000000 R09: 0000000000000000
[ 16.494297][ T231] R10: 0000000000100000 R11: 0000000000000293 R12: 00007fffe746aac8
[ 16.494543][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 16.494792][ T231]
[ 16.494917][ T231] irq event stamp: 2093077
[ 16.495083][ T231] hardirqs last enabled at (2093077): [] irqentry_exit+0x3b/0x80
[ 16.495380][ T231] hardirqs last disabled at (2093076): [] handle_softirqs+0x47f/0x610
[ 16.495668][ T231] softirqs last enabled at (2092884): [] __tun_set_ebpf+0xc6/0x180
[ 16.495952][ T231] softirqs last disabled at (2092882): [] __tun_set_ebpf+0x91/0x180
[ 16.496244][ T231] ---[ end trace 0000000000000000 ]---