[ 15.162128][ T231] ==================================================================
[ 15.162479][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 15.162724][ T231] Read of size 1 at addr ffff88800510c68c by task packetdrill/231
[ 15.163004][ T231]
[ 15.163105][ T231] CPU: 2 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.163110][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.163112][ T231] Call Trace:
[ 15.163115][ T231]
[ 15.163116][ T231] dump_stack_lvl+0x82/0xc0
[ 15.163122][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 15.163128][ T231] ? kobject_put+0xbb/0xd0
[ 15.163132][ T231] print_report+0xb4/0x270
[ 15.163135][ T231] ? kobject_put+0xbb/0xd0
[ 15.163139][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 15.163142][ T231] ? kobject_put+0xbb/0xd0
[ 15.163145][ T231] kasan_report+0xca/0x100
[ 15.163149][ T231] ? kobject_put+0xbb/0xd0
[ 15.163155][ T231] kobject_put+0xbb/0xd0
[ 15.163158][ T231] netdev_run_todo+0x5f0/0xc60
[ 15.163163][ T231] ? rtnl_is_locked+0x15/0x20
[ 15.163166][ T231] ? netif_state_change+0x228/0x2c0
[ 15.163169][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 15.163172][ T231] ? generic_xdp_install+0x410/0x410
[ 15.163176][ T231] ? tun_chr_close+0xae/0x1c0
[ 15.163183][ T231] tun_chr_close+0xc0/0x1c0
[ 15.163187][ T231] __fput+0x35c/0xa70
[ 15.163194][ T231] fput_close_sync+0xdd/0x1b0
[ 15.163197][ T231] ? alloc_file_clone+0xf0/0xf0
[ 15.163202][ T231] __x64_sys_close+0x7d/0xd0
[ 15.163205][ T231] do_syscall_64+0xc1/0xfd0
[ 15.163210][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.163214][ T231] RIP: 0033:0x4901eb
[ 15.163218][ 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
[ 15.163222][ T231] RSP: 002b:00007ffe1f46a1f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 15.163225][ T231] RAX: ffffffffffffffda RBX: 00007ffe1f46a750 RCX: 00000000004901eb
[ 15.163227][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 15.163229][ T231] RBP: 00007ffe1f46a230 R08: 0000000000000000 R09: 0000000000000000
[ 15.163231][ T231] R10: 000000002b725c70 R11: 0000000000000293 R12: 00007ffe1f46a6c8
[ 15.163233][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 15.163239][ T231]
[ 15.163240][ T231]
[ 15.171017][ T231] The buggy address belongs to the physical page:
[ 15.171254][ T231] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x510c
[ 15.171607][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 15.171804][ T231] raw: 0080000000000000 ffffea0000155a08 ffff88803633bc40 0000000000000000
[ 15.172146][ T231] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 15.172483][ T231] page dumped because: kasan: bad access detected
[ 15.172719][ T231]
[ 15.172818][ T231] Memory state around the buggy address:
[ 15.173005][ T231] ffff88800510c580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.173285][ T231] ffff88800510c600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.173566][ T231] >ffff88800510c680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.173844][ T231] ^
[ 15.173986][ T231] ffff88800510c700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.174264][ T231] ffff88800510c780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.174544][ T231] ==================================================================
[ 15.174874][ T231] Disabling lock debugging due to kernel taint
[ 15.175154][ T231] ------------[ cut here ]------------
[ 15.175360][ T231] refcount_t: underflow; use-after-free.
[ 15.175594][ T231] WARNING: CPU: 2 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 15.175960][ T231] Modules linked in:
[ 15.176145][ T231] CPU: 2 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.176597][ T231] Tainted: [B]=BAD_PAGE
[ 15.176767][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.177037][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 15.177309][ 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 e5 88 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
[ 15.178003][ T231] RSP: 0018:ffffc90000a97ce8 EFLAGS: 00010282
[ 15.178269][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 15.178575][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 15.178878][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff12fe134
[ 15.179194][ T231] R10: 0000000000000003 R11: ffffc90000a97880 R12: 0000000000000001
[ 15.179500][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 15.179803][ T231] FS: 000000002b71b3c0(0000) GS:ffff8880ab71a000(0000) knlGS:0000000000000000
[ 15.180161][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 15.180423][ T231] CR2: 00007f0826e0c000 CR3: 00000000085ad002 CR4: 0000000000772ef0
[ 15.180733][ T231] PKRU: 55555554
[ 15.180900][ T231] Call Trace:
[ 15.181054][ T231]
[ 15.181174][ T231] netdev_run_todo+0x5f0/0xc60
[ 15.181402][ T231] ? rtnl_is_locked+0x15/0x20
[ 15.181617][ T231] ? netif_state_change+0x228/0x2c0
[ 15.181832][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 15.182099][ T231] ? generic_xdp_install+0x410/0x410
[ 15.182318][ T231] ? tun_chr_close+0xae/0x1c0
[ 15.182533][ T231] tun_chr_close+0xc0/0x1c0
[ 15.182745][ T231] __fput+0x35c/0xa70
[ 15.182915][ T231] fput_close_sync+0xdd/0x1b0
[ 15.183137][ T231] ? alloc_file_clone+0xf0/0xf0
[ 15.183357][ T231] __x64_sys_close+0x7d/0xd0
[ 15.183658][ T231] do_syscall_64+0xc1/0xfd0
[ 15.183873][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.184138][ T231] RIP: 0033:0x4901eb
[ 15.184315][ 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
[ 15.185112][ T231] RSP: 002b:00007ffe1f46a1f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 15.185509][ T231] RAX: ffffffffffffffda RBX: 00007ffe1f46a750 RCX: 00000000004901eb
[ 15.185815][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 15.186134][ T231] RBP: 00007ffe1f46a230 R08: 0000000000000000 R09: 0000000000000000
[ 15.186526][ T231] R10: 000000002b725c70 R11: 0000000000000293 R12: 00007ffe1f46a6c8
[ 15.186829][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 15.187144][ T231]
[ 15.187404][ T231] irq event stamp: 2082507
[ 15.187619][ T231] hardirqs last enabled at (2082507): [] irqentry_exit+0x3b/0x80
[ 15.187968][ T231] hardirqs last disabled at (2082506): [] handle_softirqs+0x47f/0x610
[ 15.188412][ T231] softirqs last enabled at (2082318): [] __tun_set_ebpf+0xc6/0x180
[ 15.188760][ T231] softirqs last disabled at (2082316): [] __tun_set_ebpf+0x91/0x180
[ 15.189208][ T231] ---[ end trace 0000000000000000 ]---