[ 19.448320][ T230] ==================================================================
[ 19.448604][ T230] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 19.448806][ T230] Read of size 1 at addr ffff88800c19468c by task packetdrill/230
[ 19.449037][ T230]
[ 19.449127][ T230] CPU: 3 UID: 0 PID: 230 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 19.449131][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 19.449133][ T230] Call Trace:
[ 19.449135][ T230]
[ 19.449137][ T230] dump_stack_lvl+0x82/0xc0
[ 19.449142][ T230] print_address_description.constprop.0+0x2c/0x3a0
[ 19.449151][ T230] ? kobject_put+0xbb/0xd0
[ 19.449155][ T230] print_report+0xb4/0x270
[ 19.449159][ T230] ? kobject_put+0xbb/0xd0
[ 19.449162][ T230] ? kasan_addr_to_slab+0x21/0x70
[ 19.449165][ T230] ? kobject_put+0xbb/0xd0
[ 19.449168][ T230] kasan_report+0xca/0x100
[ 19.449172][ T230] ? kobject_put+0xbb/0xd0
[ 19.449177][ T230] kobject_put+0xbb/0xd0
[ 19.449181][ T230] netdev_run_todo+0x5f0/0xc60
[ 19.449187][ T230] ? rtnl_is_locked+0x15/0x20
[ 19.449191][ T230] ? netif_state_change+0x228/0x2c0
[ 19.449195][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 19.449197][ T230] ? generic_xdp_install+0x410/0x410
[ 19.449201][ T230] ? tun_chr_close+0xae/0x1c0
[ 19.449210][ T230] tun_chr_close+0xc0/0x1c0
[ 19.449214][ T230] __fput+0x35c/0xa70
[ 19.449223][ T230] fput_close_sync+0xdd/0x1b0
[ 19.449226][ T230] ? alloc_file_clone+0xf0/0xf0
[ 19.449231][ T230] __x64_sys_close+0x7d/0xd0
[ 19.449234][ T230] do_syscall_64+0xc1/0xfd0
[ 19.449241][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 19.449245][ T230] RIP: 0033:0x4901eb
[ 19.449249][ T230] 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
[ 19.449255][ T230] RSP: 002b:00007ffe07398c40 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 19.449258][ T230] RAX: ffffffffffffffda RBX: 00007ffe073991a0 RCX: 00000000004901eb
[ 19.449261][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 19.449263][ T230] RBP: 00007ffe07398c80 R08: 0000000000000000 R09: 0000000000000000
[ 19.449264][ T230] R10: 0000000000000010 R11: 0000000000000293 R12: 00007ffe07399118
[ 19.449266][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 19.449272][ T230]
[ 19.449273][ T230]
[ 19.455694][ T230] The buggy address belongs to the physical page:
[ 19.455885][ T230] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xc194
[ 19.456176][ T230] flags: 0x80000000000000(node=0|zone=1)
[ 19.456342][ T230] raw: 0080000000000000 ffffea000031b708 ffff8880363bbc40 0000000000000000
[ 19.456621][ T230] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 19.456901][ T230] page dumped because: kasan: bad access detected
[ 19.457101][ T230]
[ 19.457179][ T230] Memory state around the buggy address:
[ 19.457329][ T230] ffff88800c194580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 19.457564][ T230] ffff88800c194600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 19.457795][ T230] >ffff88800c194680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 19.458021][ T230] ^
[ 19.458136][ T230] ffff88800c194700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 19.458362][ T230] ffff88800c194780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 19.458587][ T230] ==================================================================
[ 19.458829][ T230] Disabling lock debugging due to kernel taint
[ 19.459024][ T230] ------------[ cut here ]------------
[ 19.459170][ T230] refcount_t: underflow; use-after-free.
[ 19.459349][ T230] WARNING: CPU: 3 PID: 230 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 19.459615][ T230] Modules linked in:
[ 19.459744][ T230] CPU: 3 UID: 0 PID: 230 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 19.460090][ T230] Tainted: [B]=BAD_PAGE
[ 19.460206][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 19.460407][ T230] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 19.460606][ T230] 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 a3 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
[ 19.461151][ T230] RSP: 0018:ffffc90000b07ce8 EFLAGS: 00010282
[ 19.461354][ T230] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 19.461589][ T230] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 19.461821][ T230] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff48be134
[ 19.462050][ T230] R10: 0000000000000003 R11: ffffc90000b07880 R12: 0000000000000001
[ 19.462286][ T230] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 19.462512][ T230] FS: 0000000005c9e3c0(0000) GS:ffff88809099a000(0000) knlGS:0000000000000000
[ 19.462788][ T230] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 19.462984][ T230] CR2: 00007fe8a99b7000 CR3: 000000000b873003 CR4: 0000000000772ef0
[ 19.463213][ T230] PKRU: 55555554
[ 19.463345][ T230] Call Trace:
[ 19.463460][ T230]
[ 19.463538][ T230] netdev_run_todo+0x5f0/0xc60
[ 19.463701][ T230] ? rtnl_is_locked+0x15/0x20
[ 19.463855][ T230] ? netif_state_change+0x228/0x2c0
[ 19.464012][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 19.464199][ T230] ? generic_xdp_install+0x410/0x410
[ 19.464359][ T230] ? tun_chr_close+0xae/0x1c0
[ 19.464518][ T230] tun_chr_close+0xc0/0x1c0
[ 19.464669][ T230] __fput+0x35c/0xa70
[ 19.464790][ T230] fput_close_sync+0xdd/0x1b0
[ 19.464939][ T230] ? alloc_file_clone+0xf0/0xf0
[ 19.465093][ T230] __x64_sys_close+0x7d/0xd0
[ 19.465247][ T230] do_syscall_64+0xc1/0xfd0
[ 19.465409][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 19.465598][ T230] RIP: 0033:0x4901eb
[ 19.465719][ T230] 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
[ 19.466271][ T230] RSP: 002b:00007ffe07398c40 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 19.466514][ T230] RAX: ffffffffffffffda RBX: 00007ffe073991a0 RCX: 00000000004901eb
[ 19.466743][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 19.466968][ T230] RBP: 00007ffe07398c80 R08: 0000000000000000 R09: 0000000000000000
[ 19.467195][ T230] R10: 0000000000000010 R11: 0000000000000293 R12: 00007ffe07399118
[ 19.467437][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 19.467675][ T230]
[ 19.467791][ T230] irq event stamp: 2163783
[ 19.467945][ T230] hardirqs last enabled at (2163783): [] irqentry_exit+0x3b/0x80
[ 19.468214][ T230] hardirqs last disabled at (2163782): [] sysvec_apic_timer_interrupt+0xf/0xc0
[ 19.468525][ T230] softirqs last enabled at (2163600): [] __tun_set_ebpf+0xc6/0x180
[ 19.468790][ T230] softirqs last disabled at (2163598): [] __tun_set_ebpf+0x91/0x180
[ 19.469052][ T230] ---[ end trace 0000000000000000 ]---