[ 15.874193][ T230] ==================================================================
[ 15.874546][ T230] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 15.874754][ T230] Read of size 1 at addr ffff888008e2c68c by task packetdrill/230
[ 15.874997][ T230]
[ 15.875081][ T230] CPU: 3 UID: 0 PID: 230 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.875087][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.875089][ T230] Call Trace:
[ 15.875091][ T230]
[ 15.875093][ T230] dump_stack_lvl+0x82/0xc0
[ 15.875098][ T230] print_address_description.constprop.0+0x2c/0x3a0
[ 15.875105][ T230] ? kobject_put+0xbb/0xd0
[ 15.875109][ T230] print_report+0xb4/0x270
[ 15.875112][ T230] ? kobject_put+0xbb/0xd0
[ 15.875115][ T230] ? kasan_addr_to_slab+0x21/0x70
[ 15.875119][ T230] ? kobject_put+0xbb/0xd0
[ 15.875122][ T230] kasan_report+0xca/0x100
[ 15.875126][ T230] ? kobject_put+0xbb/0xd0
[ 15.875131][ T230] kobject_put+0xbb/0xd0
[ 15.875134][ T230] netdev_run_todo+0x5f0/0xc60
[ 15.875139][ T230] ? rtnl_is_locked+0x15/0x20
[ 15.875142][ T230] ? netif_state_change+0x228/0x2c0
[ 15.875145][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 15.875148][ T230] ? generic_xdp_install+0x410/0x410
[ 15.875152][ T230] ? tun_chr_close+0xae/0x1c0
[ 15.875159][ T230] tun_chr_close+0xc0/0x1c0
[ 15.875163][ T230] __fput+0x35c/0xa70
[ 15.875170][ T230] fput_close_sync+0xdd/0x1b0
[ 15.875173][ T230] ? alloc_file_clone+0xf0/0xf0
[ 15.875177][ T230] __x64_sys_close+0x7d/0xd0
[ 15.875181][ T230] do_syscall_64+0xc1/0xfd0
[ 15.875186][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.875190][ T230] RIP: 0033:0x4901eb
[ 15.875194][ 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
[ 15.875197][ T230] RSP: 002b:00007ffcf1da7b80 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 15.875201][ T230] RAX: ffffffffffffffda RBX: 00007ffcf1da80e0 RCX: 00000000004901eb
[ 15.875203][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 15.875205][ T230] RBP: 00007ffcf1da7bc0 R08: 0000000000000000 R09: 0000000000000000
[ 15.875207][ T230] R10: 0000000037095260 R11: 0000000000000293 R12: 00007ffcf1da8058
[ 15.875209][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 15.875215][ T230]
[ 15.875216][ T230]
[ 15.881741][ T230] The buggy address belongs to the physical page:
[ 15.881938][ T230] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8e2c
[ 15.882234][ T230] flags: 0x80000000000000(node=0|zone=1)
[ 15.882401][ T230] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 15.882686][ T230] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
[ 15.882969][ T230] page dumped because: kasan: bad access detected
[ 15.883169][ T230]
[ 15.883248][ T230] Memory state around the buggy address:
[ 15.883408][ T230] ffff888008e2c580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.883659][ T230] ffff888008e2c600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.883890][ T230] >ffff888008e2c680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.884145][ T230] ^
[ 15.884263][ T230] ffff888008e2c700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.884496][ T230] ffff888008e2c780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.884723][ T230] ==================================================================
[ 15.884982][ T230] Disabling lock debugging due to kernel taint
[ 15.885196][ T230] ------------[ cut here ]------------
[ 15.885348][ T230] refcount_t: underflow; use-after-free.
[ 15.885526][ T230] WARNING: CPU: 3 PID: 230 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 15.885961][ T230] Modules linked in:
[ 15.886094][ T230] CPU: 3 UID: 0 PID: 230 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.886447][ T230] Tainted: [B]=BAD_PAGE
[ 15.886567][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.886780][ T230] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 15.886985][ 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 a5 a5 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
[ 15.887557][ T230] RSP: 0018:ffffc90000ae7ce8 EFLAGS: 00010282
[ 15.887765][ T230] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 15.888007][ T230] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 15.888246][ T230] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff4c7e134
[ 15.888477][ T230] R10: 0000000000000003 R11: ffffc90000ae7880 R12: 0000000000000001
[ 15.888720][ T230] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 15.888956][ T230] FS: 000000003708d3c0(0000) GS:ffff888088f9a000(0000) knlGS:0000000000000000
[ 15.889230][ T230] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 15.889424][ T230] CR2: 00007fe26a44c000 CR3: 000000000977d005 CR4: 0000000000772ef0
[ 15.889665][ T230] PKRU: 55555554
[ 15.889782][ T230] Call Trace:
[ 15.889904][ T230]
[ 15.889982][ T230] netdev_run_todo+0x5f0/0xc60
[ 15.890144][ T230] ? rtnl_is_locked+0x15/0x20
[ 15.890304][ T230] ? netif_state_change+0x228/0x2c0
[ 15.890462][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 15.890664][ T230] ? generic_xdp_install+0x410/0x410
[ 15.890820][ T230] ? tun_chr_close+0xae/0x1c0
[ 15.890977][ T230] tun_chr_close+0xc0/0x1c0
[ 15.891132][ T230] __fput+0x35c/0xa70
[ 15.891256][ T230] fput_close_sync+0xdd/0x1b0
[ 15.891410][ T230] ? alloc_file_clone+0xf0/0xf0
[ 15.891567][ T230] __x64_sys_close+0x7d/0xd0
[ 15.891727][ T230] do_syscall_64+0xc1/0xfd0
[ 15.891883][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.892089][ T230] RIP: 0033:0x4901eb
[ 15.892215][ 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
[ 15.892783][ T230] RSP: 002b:00007ffcf1da7b80 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 15.893028][ T230] RAX: ffffffffffffffda RBX: 00007ffcf1da80e0 RCX: 00000000004901eb
[ 15.893270][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 15.893506][ T230] RBP: 00007ffcf1da7bc0 R08: 0000000000000000 R09: 0000000000000000
[ 15.893749][ T230] R10: 0000000037095260 R11: 0000000000000293 R12: 00007ffcf1da8058
[ 15.894004][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 15.894242][ T230]
[ 15.894364][ T230] irq event stamp: 2009053
[ 15.894531][ T230] hardirqs last enabled at (2009053): [] irqentry_exit+0x3b/0x80
[ 15.894825][ T230] hardirqs last disabled at (2009052): [] handle_softirqs+0x47f/0x610
[ 15.895101][ T230] softirqs last enabled at (2008862): [] __tun_set_ebpf+0xc6/0x180
[ 15.895368][ T230] softirqs last disabled at (2008860): [] __tun_set_ebpf+0x91/0x180
[ 15.895646][ T230] ---[ end trace 0000000000000000 ]---