[ 21.666536][ T231] ==================================================================
[ 21.667031][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 21.667356][ T231] Read of size 1 at addr ffff8880027b468c by task packetdrill/231
[ 21.667724][ T231]
[ 21.667870][ T231] CPU: 2 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.667879][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.667882][ T231] Call Trace:
[ 21.667885][ T231]
[ 21.667889][ T231] dump_stack_lvl+0x82/0xc0
[ 21.667901][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 21.667910][ T231] ? kobject_put+0xbb/0xd0
[ 21.667916][ T231] print_report+0xb4/0x270
[ 21.667920][ T231] ? kobject_put+0xbb/0xd0
[ 21.667924][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 21.667929][ T231] ? kobject_put+0xbb/0xd0
[ 21.667933][ T231] kasan_report+0xca/0x100
[ 21.667939][ T231] ? kobject_put+0xbb/0xd0
[ 21.667948][ T231] kobject_put+0xbb/0xd0
[ 21.667954][ T231] netdev_run_todo+0x5f0/0xc60
[ 21.667962][ T231] ? rtnl_is_locked+0x15/0x20
[ 21.667967][ T231] ? netif_state_change+0x228/0x2c0
[ 21.667972][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 21.667977][ T231] ? generic_xdp_install+0x410/0x410
[ 21.667985][ T231] ? tun_chr_close+0xae/0x1c0
[ 21.667997][ T231] tun_chr_close+0xc0/0x1c0
[ 21.668003][ T231] __fput+0x35c/0xa70
[ 21.668015][ T231] fput_close_sync+0xdd/0x1b0
[ 21.668020][ T231] ? alloc_file_clone+0xf0/0xf0
[ 21.668030][ T231] __x64_sys_close+0x7d/0xd0
[ 21.668035][ T231] do_syscall_64+0xc1/0xfd0
[ 21.668044][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.668050][ T231] RIP: 0033:0x4901eb
[ 21.668056][ 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
[ 21.668061][ T231] RSP: 002b:00007fff98353d70 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 21.668067][ T231] RAX: ffffffffffffffda RBX: 00007fff983542d0 RCX: 00000000004901eb
[ 21.668071][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 21.668074][ T231] RBP: 00007fff98353db0 R08: 0000000000000000 R09: 0000000000000000
[ 21.668077][ T231] R10: 0000000000000004 R11: 0000000000000293 R12: 00007fff98354248
[ 21.668080][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 21.668093][ T231]
[ 21.668095][ T231]
[ 21.679101][ T231] The buggy address belongs to the physical page:
[ 21.679443][ T231] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27b4
[ 21.679932][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 21.680220][ T231] raw: 0080000000000000 ffffea0000092908 ffff88803073bc40 0000000000000000
[ 21.680720][ T231] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 21.681201][ T231] page dumped because: kasan: bad access detected
[ 21.681527][ T231]
[ 21.681669][ T231] Memory state around the buggy address:
[ 21.681930][ T231] ffff8880027b4580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.682335][ T231] ffff8880027b4600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.682735][ T231] >ffff8880027b4680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.683127][ T231] ^
[ 21.683325][ T231] ffff8880027b4700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.683710][ T231] ffff8880027b4780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.684110][ T231] ==================================================================
[ 21.684691][ T231] Disabling lock debugging due to kernel taint
[ 21.685043][ T231] ------------[ cut here ]------------
[ 21.685320][ T231] refcount_t: underflow; use-after-free.
[ 21.685663][ T231] WARNING: CPU: 2 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 21.686153][ T231] Modules linked in:
[ 21.686399][ T231] CPU: 2 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.687031][ T231] Tainted: [B]=BAD_PAGE
[ 21.687263][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.687642][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 21.688023][ 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 25 aa 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
[ 21.689010][ T231] RSP: 0018:ffffc90000b37ce8 EFLAGS: 00010282
[ 21.689371][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 21.689809][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 21.690231][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff557e134
[ 21.690642][ T231] R10: 0000000000000003 R11: ffffc90000b37880 R12: 0000000000000001
[ 21.691055][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 21.691496][ T231] FS: 000000003bf233c0(0000) GS:ffff88808471a000(0000) knlGS:0000000000000000
[ 21.691988][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.692355][ T231] CR2: 00007fad65dc91b4 CR3: 0000000008b26002 CR4: 0000000000772ef0
[ 21.692808][ T231] PKRU: 55555554
[ 21.693041][ T231] Call Trace:
[ 21.693269][ T231]
[ 21.693438][ T231] netdev_run_todo+0x5f0/0xc60
[ 21.693757][ T231] ? rtnl_is_locked+0x15/0x20
[ 21.694057][ T231] ? netif_state_change+0x228/0x2c0
[ 21.694364][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 21.694869][ T231] ? generic_xdp_install+0x410/0x410
[ 21.695181][ T231] ? tun_chr_close+0xae/0x1c0
[ 21.695472][ T231] tun_chr_close+0xc0/0x1c0
[ 21.695751][ T231] __fput+0x35c/0xa70
[ 21.695977][ T231] fput_close_sync+0xdd/0x1b0
[ 21.696417][ T231] ? alloc_file_clone+0xf0/0xf0
[ 21.696705][ T231] __x64_sys_close+0x7d/0xd0
[ 21.697001][ T231] do_syscall_64+0xc1/0xfd0
[ 21.697294][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.697789][ T231] RIP: 0033:0x4901eb
[ 21.698032][ 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
[ 21.699154][ T231] RSP: 002b:00007fff98353d70 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 21.699571][ T231] RAX: ffffffffffffffda RBX: 00007fff983542d0 RCX: 00000000004901eb
[ 21.700146][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 21.700573][ T231] RBP: 00007fff98353db0 R08: 0000000000000000 R09: 0000000000000000
[ 21.700982][ T231] R10: 0000000000000004 R11: 0000000000000293 R12: 00007fff98354248
[ 21.701566][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 21.701970][ T231]
[ 21.702184][ T231] irq event stamp: 1008493
[ 21.702603][ T231] hardirqs last enabled at (1008493): [] irqentry_exit+0x3b/0x80
[ 21.703083][ T231] hardirqs last disabled at (1008492): [] handle_softirqs+0x47f/0x610
[ 21.703578][ T231] softirqs last enabled at (1008380): [] handle_softirqs+0x352/0x610
[ 21.704220][ T231] softirqs last disabled at (1008373): [] irq_exit_rcu+0xab/0x100
[ 21.704661][ T231] ---[ end trace 0000000000000000 ]---