[ 18.418713][ T232] ==================================================================
[ 18.419189][ T232] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 18.419544][ T232] Read of size 1 at addr ffff88800a88868c by task packetdrill/232
[ 18.419955][ T232]
[ 18.420097][ T232] CPU: 0 UID: 0 PID: 232 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 18.420106][ T232] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.420109][ T232] Call Trace:
[ 18.420113][ T232]
[ 18.420116][ T232] dump_stack_lvl+0x82/0xc0
[ 18.420127][ T232] print_address_description.constprop.0+0x2c/0x3a0
[ 18.420138][ T232] ? kobject_put+0xbb/0xd0
[ 18.420145][ T232] print_report+0xb4/0x270
[ 18.420151][ T232] ? kobject_put+0xbb/0xd0
[ 18.420156][ T232] ? kasan_addr_to_slab+0x21/0x70
[ 18.420162][ T232] ? kobject_put+0xbb/0xd0
[ 18.420168][ T232] kasan_report+0xca/0x100
[ 18.420175][ T232] ? kobject_put+0xbb/0xd0
[ 18.420185][ T232] kobject_put+0xbb/0xd0
[ 18.420191][ T232] netdev_run_todo+0x5f0/0xc60
[ 18.420200][ T232] ? rtnl_is_locked+0x15/0x20
[ 18.420206][ T232] ? netif_state_change+0x228/0x2c0
[ 18.420211][ T232] ? call_netdevice_notifiers_info+0x100/0x100
[ 18.420217][ T232] ? generic_xdp_install+0x410/0x410
[ 18.420224][ T232] ? tun_chr_close+0xae/0x1c0
[ 18.420236][ T232] tun_chr_close+0xc0/0x1c0
[ 18.420243][ T232] __fput+0x35c/0xa70
[ 18.420255][ T232] fput_close_sync+0xdd/0x1b0
[ 18.420261][ T232] ? alloc_file_clone+0xf0/0xf0
[ 18.420271][ T232] __x64_sys_close+0x7d/0xd0
[ 18.420277][ T232] do_syscall_64+0xc1/0xfd0
[ 18.420287][ T232] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 18.420294][ T232] RIP: 0033:0x4901eb
[ 18.420301][ T232] 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
[ 18.420307][ T232] RSP: 002b:00007ffd47800bf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 18.420313][ T232] RAX: ffffffffffffffda RBX: 00007ffd47801150 RCX: 00000000004901eb
[ 18.420317][ T232] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 18.420320][ T232] RBP: 00007ffd47800c30 R08: 0000000000000000 R09: 0000000000000000
[ 18.420323][ T232] R10: 0000000000000004 R11: 0000000000000293 R12: 00007ffd478010c8
[ 18.420327][ T232] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 18.420339][ T232]
[ 18.420341][ T232]
[ 18.431807][ T232] The buggy address belongs to the physical page:
[ 18.432188][ T232] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800a88af80 pfn:0xa888
[ 18.432768][ T232] flags: 0x80000000000000(node=0|zone=1)
[ 18.433081][ T232] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 18.433600][ T232] raw: ffff88800a88af80 0000000000000000 00000001ffffffff 0000000000000000
[ 18.434115][ T232] page dumped because: kasan: bad access detected
[ 18.434469][ T232]
[ 18.434604][ T232] Memory state around the buggy address:
[ 18.434876][ T232] ffff88800a888580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.435303][ T232] ffff88800a888600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.435703][ T232] >ffff88800a888680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.436111][ T232] ^
[ 18.436317][ T232] ffff88800a888700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.436747][ T232] ffff88800a888780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.437148][ T232] ==================================================================
[ 18.437586][ T232] Disabling lock debugging due to kernel taint
[ 18.437935][ T232] ------------[ cut here ]------------
[ 18.438186][ T232] refcount_t: underflow; use-after-free.
[ 18.438493][ T232] WARNING: CPU: 0 PID: 232 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 18.438974][ T232] Modules linked in:
[ 18.439188][ T232] CPU: 0 UID: 0 PID: 232 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 18.439831][ T232] Tainted: [B]=BAD_PAGE
[ 18.440050][ T232] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.440413][ T232] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 18.440796][ T232] 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 a5 9e 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
[ 18.441808][ T232] RSP: 0018:ffffc90000a97ce8 EFLAGS: 00010282
[ 18.442173][ T232] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 18.442598][ T232] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 18.443020][ T232] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3e7e134
[ 18.443416][ T232] R10: 0000000000000003 R11: ffffc90000a97880 R12: 0000000000000001
[ 18.443849][ T232] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 18.444313][ T232] FS: 000000003747c3c0(0000) GS:ffff888095a1a000(0000) knlGS:0000000000000000
[ 18.444810][ T232] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 18.445158][ T232] CR2: 00007fc6289fb000 CR3: 000000000c02e003 CR4: 0000000000772ef0
[ 18.445600][ T232] PKRU: 55555554
[ 18.445824][ T232] Call Trace:
[ 18.446022][ T232]
[ 18.446453][ T232] netdev_run_todo+0x5f0/0xc60
[ 18.446779][ T232] ? rtnl_is_locked+0x15/0x20
[ 18.447055][ T232] ? netif_state_change+0x228/0x2c0
[ 18.447352][ T232] ? call_netdevice_notifiers_info+0x100/0x100
[ 18.447685][ T232] ? generic_xdp_install+0x410/0x410
[ 18.447992][ T232] ? tun_chr_close+0xae/0x1c0
[ 18.448279][ T232] tun_chr_close+0xc0/0x1c0
[ 18.448557][ T232] __fput+0x35c/0xa70
[ 18.448783][ T232] fput_close_sync+0xdd/0x1b0
[ 18.449052][ T232] ? alloc_file_clone+0xf0/0xf0
[ 18.449356][ T232] __x64_sys_close+0x7d/0xd0
[ 18.449645][ T232] do_syscall_64+0xc1/0xfd0
[ 18.449982][ T232] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 18.450350][ T232] RIP: 0033:0x4901eb
[ 18.450578][ T232] 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
[ 18.451604][ T232] RSP: 002b:00007ffd47800bf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 18.452301][ T232] RAX: ffffffffffffffda RBX: 00007ffd47801150 RCX: 00000000004901eb
[ 18.452702][ T232] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 18.453159][ T232] RBP: 00007ffd47800c30 R08: 0000000000000000 R09: 0000000000000000
[ 18.453721][ T232] R10: 0000000000000004 R11: 0000000000000293 R12: 00007ffd478010c8
[ 18.454173][ T232] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 18.454580][ T232]
[ 18.454983][ T232] irq event stamp: 2035403
[ 18.455257][ T232] hardirqs last enabled at (2035403): [] irqentry_exit+0x3b/0x80
[ 18.455729][ T232] hardirqs last disabled at (2035402): [] sysvec_apic_timer_interrupt+0xf/0xc0
[ 18.456431][ T232] softirqs last enabled at (2035222): [] __tun_set_ebpf+0xc6/0x180
[ 18.456913][ T232] softirqs last disabled at (2035220): [] __tun_set_ebpf+0x91/0x180
[ 18.457567][ T232] ---[ end trace 0000000000000000 ]---