[ 16.532270][ T231] ==================================================================
[ 16.532543][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 16.532741][ T231] Read of size 1 at addr ffff88800a67c68c by task packetdrill/231
[ 16.532968][ T231]
[ 16.533047][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.533052][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.533054][ T231] Call Trace:
[ 16.533056][ T231]
[ 16.533058][ T231] dump_stack_lvl+0x82/0xc0
[ 16.533063][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 16.533069][ T231] ? kobject_put+0xbb/0xd0
[ 16.533073][ T231] print_report+0xb4/0x270
[ 16.533077][ T231] ? kobject_put+0xbb/0xd0
[ 16.533080][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 16.533083][ T231] ? kobject_put+0xbb/0xd0
[ 16.533086][ T231] kasan_report+0xca/0x100
[ 16.533090][ T231] ? kobject_put+0xbb/0xd0
[ 16.533095][ T231] kobject_put+0xbb/0xd0
[ 16.533099][ T231] netdev_run_todo+0x5f0/0xc60
[ 16.533103][ T231] ? rtnl_is_locked+0x15/0x20
[ 16.533107][ T231] ? netif_state_change+0x228/0x2c0
[ 16.533110][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 16.533113][ T231] ? generic_xdp_install+0x410/0x410
[ 16.533117][ T231] ? tun_chr_close+0xae/0x1c0
[ 16.533124][ T231] tun_chr_close+0xc0/0x1c0
[ 16.533127][ T231] __fput+0x35c/0xa70
[ 16.533135][ T231] fput_close_sync+0xdd/0x1b0
[ 16.533138][ T231] ? alloc_file_clone+0xf0/0xf0
[ 16.533142][ T231] __x64_sys_close+0x7d/0xd0
[ 16.533146][ T231] do_syscall_64+0xc1/0xfd0
[ 16.533154][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.533157][ T231] RIP: 0033:0x4901eb
[ 16.533162][ 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
[ 16.533164][ T231] RSP: 002b:00007ffd26b14f70 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 16.533168][ T231] RAX: ffffffffffffffda RBX: 00007ffd26b154d0 RCX: 00000000004901eb
[ 16.533170][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 16.533172][ T231] RBP: 00007ffd26b14fb0 R08: 0000000000000000 R09: 0000000000000000
[ 16.533174][ T231] R10: 000000000b5bc570 R11: 0000000000000293 R12: 00007ffd26b15448
[ 16.533176][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 16.533182][ T231]
[ 16.533183][ T231]
[ 16.539470][ T231] The buggy address belongs to the physical page:
[ 16.539663][ T231] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa67c
[ 16.539938][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 16.540106][ T231] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 16.540383][ T231] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
[ 16.540660][ T231] page dumped because: kasan: bad access detected
[ 16.540848][ T231]
[ 16.540925][ T231] Memory state around the buggy address:
[ 16.541074][ T231] ffff88800a67c580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.541302][ T231] ffff88800a67c600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.541524][ T231] >ffff88800a67c680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.541754][ T231] ^
[ 16.541868][ T231] ffff88800a67c700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.542090][ T231] ffff88800a67c780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.542315][ T231] ==================================================================
[ 16.542778][ T231] Disabling lock debugging due to kernel taint
[ 16.542968][ T231] ------------[ cut here ]------------
[ 16.543109][ T231] refcount_t: underflow; use-after-free.
[ 16.543287][ T231] WARNING: CPU: 0 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.543574][ T231] Modules linked in:
[ 16.543696][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.544032][ T231] Tainted: [B]=BAD_PAGE
[ 16.544147][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.544345][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.544543][ 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 05 8c 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
[ 16.545074][ T231] RSP: 0018:ffffc90000737ce8 EFLAGS: 00010282
[ 16.545270][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.545499][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.545722][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff193e134
[ 16.545944][ T231] R10: 0000000000000003 R11: ffffc90000737880 R12: 0000000000000001
[ 16.546171][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.546398][ T231] FS: 000000000b5b53c0(0000) GS:ffff8880a281a000(0000) knlGS:0000000000000000
[ 16.546662][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.546850][ T231] CR2: 00007f9279f97000 CR3: 000000000abc3006 CR4: 0000000000772ef0
[ 16.547075][ T231] PKRU: 55555554
[ 16.547196][ T231] Call Trace:
[ 16.547309][ T231]
[ 16.547386][ T231] netdev_run_todo+0x5f0/0xc60
[ 16.547545][ T231] ? rtnl_is_locked+0x15/0x20
[ 16.547695][ T231] ? netif_state_change+0x228/0x2c0
[ 16.547848][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 16.548031][ T231] ? generic_xdp_install+0x410/0x410
[ 16.548189][ T231] ? tun_chr_close+0xae/0x1c0
[ 16.548341][ T231] tun_chr_close+0xc0/0x1c0
[ 16.548503][ T231] __fput+0x35c/0xa70
[ 16.548622][ T231] fput_close_sync+0xdd/0x1b0
[ 16.548772][ T231] ? alloc_file_clone+0xf0/0xf0
[ 16.548924][ T231] __x64_sys_close+0x7d/0xd0
[ 16.549072][ T231] do_syscall_64+0xc1/0xfd0
[ 16.549229][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.549417][ T231] RIP: 0033:0x4901eb
[ 16.549534][ 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
[ 16.550063][ T231] RSP: 002b:00007ffd26b14f70 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 16.550295][ T231] RAX: ffffffffffffffda RBX: 00007ffd26b154d0 RCX: 00000000004901eb
[ 16.550520][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 16.550743][ T231] RBP: 00007ffd26b14fb0 R08: 0000000000000000 R09: 0000000000000000
[ 16.550987][ T231] R10: 000000000b5bc570 R11: 0000000000000293 R12: 00007ffd26b15448
[ 16.551217][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 16.551447][ T231]
[ 16.551559][ T231] irq event stamp: 2055925
[ 16.551720][ T231] hardirqs last enabled at (2055925): [] irqentry_exit+0x3b/0x80
[ 16.551977][ T231] hardirqs last disabled at (2055924): [] handle_softirqs+0x47f/0x610
[ 16.552240][ T231] softirqs last enabled at (2055398): [] handle_softirqs+0x352/0x610
[ 16.552500][ T231] softirqs last disabled at (2054479): [] irq_exit_rcu+0xab/0x100
[ 16.552770][ T231] ---[ end trace 0000000000000000 ]---