[ 16.065625][ T230] ==================================================================
[ 16.065936][ T230] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 16.066151][ T230] Read of size 1 at addr ffff88800c16468c by task packetdrill/230
[ 16.066407][ T230]
[ 16.066491][ T230] CPU: 2 UID: 0 PID: 230 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.066496][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.066498][ T230] Call Trace:
[ 16.066500][ T230]
[ 16.066502][ T230] dump_stack_lvl+0x82/0xc0
[ 16.066507][ T230] print_address_description.constprop.0+0x2c/0x3a0
[ 16.066514][ T230] ? kobject_put+0xbb/0xd0
[ 16.066518][ T230] print_report+0xb4/0x270
[ 16.066521][ T230] ? kobject_put+0xbb/0xd0
[ 16.066524][ T230] ? kasan_addr_to_slab+0x21/0x70
[ 16.066528][ T230] ? kobject_put+0xbb/0xd0
[ 16.066531][ T230] kasan_report+0xca/0x100
[ 16.066535][ T230] ? kobject_put+0xbb/0xd0
[ 16.066540][ T230] kobject_put+0xbb/0xd0
[ 16.066543][ T230] netdev_run_todo+0x5f0/0xc60
[ 16.066550][ T230] ? rtnl_is_locked+0x15/0x20
[ 16.066554][ T230] ? netif_state_change+0x228/0x2c0
[ 16.066556][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 16.066560][ T230] ? generic_xdp_install+0x410/0x410
[ 16.066564][ T230] ? tun_chr_close+0xae/0x1c0
[ 16.066573][ T230] tun_chr_close+0xc0/0x1c0
[ 16.066577][ T230] __fput+0x35c/0xa70
[ 16.066584][ T230] fput_close_sync+0xdd/0x1b0
[ 16.066587][ T230] ? alloc_file_clone+0xf0/0xf0
[ 16.066591][ T230] __x64_sys_close+0x7d/0xd0
[ 16.066595][ T230] do_syscall_64+0xc1/0xfd0
[ 16.066601][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.066605][ T230] RIP: 0033:0x4901eb
[ 16.066609][ 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
[ 16.066611][ T230] RSP: 002b:00007ffd7c8b1e60 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 16.066615][ T230] RAX: ffffffffffffffda RBX: 00007ffd7c8b23c0 RCX: 00000000004901eb
[ 16.066618][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 16.066619][ T230] RBP: 00007ffd7c8b1ea0 R08: 0000000000000000 R09: 0000000000000000
[ 16.066621][ T230] R10: 0000000000000004 R11: 0000000000000293 R12: 00007ffd7c8b2338
[ 16.066623][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 16.066629][ T230]
[ 16.066630][ T230]
[ 16.073053][ T230] The buggy address belongs to the physical page:
[ 16.073262][ T230] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xc164
[ 16.073539][ T230] flags: 0x80000000000000(node=0|zone=1)
[ 16.073707][ T230] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 16.073988][ T230] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
[ 16.074267][ T230] page dumped because: kasan: bad access detected
[ 16.074460][ T230]
[ 16.074536][ T230] Memory state around the buggy address:
[ 16.074686][ T230] ffff88800c164580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.074917][ T230] ffff88800c164600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.075143][ T230] >ffff88800c164680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.075371][ T230] ^
[ 16.075489][ T230] ffff88800c164700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.075713][ T230] ffff88800c164780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.075940][ T230] ==================================================================
[ 16.076244][ T230] Disabling lock debugging due to kernel taint
[ 16.076460][ T230] ------------[ cut here ]------------
[ 16.076639][ T230] refcount_t: underflow; use-after-free.
[ 16.076849][ T230] WARNING: CPU: 2 PID: 230 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.077152][ T230] Modules linked in:
[ 16.077296][ T230] CPU: 2 UID: 0 PID: 230 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.077676][ T230] Tainted: [B]=BAD_PAGE
[ 16.077823][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.078038][ T230] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.078258][ 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 45 b5 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
[ 16.078836][ T230] RSP: 0018:ffffc90000b17ce8 EFLAGS: 00010282
[ 16.079055][ T230] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.079307][ T230] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.079556][ T230] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff6bbe134
[ 16.079820][ T230] R10: 0000000000000003 R11: ffffc90000b17880 R12: 0000000000000001
[ 16.080076][ T230] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.080323][ T230] FS: 00000000112593c0(0000) GS:ffff88807951a000(0000) knlGS:0000000000000000
[ 16.080609][ T230] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.080841][ T230] CR2: 00007f82cb430000 CR3: 0000000004d65003 CR4: 0000000000772ef0
[ 16.081096][ T230] PKRU: 55555554
[ 16.081233][ T230] Call Trace:
[ 16.081375][ T230]
[ 16.081476][ T230] netdev_run_todo+0x5f0/0xc60
[ 16.081655][ T230] ? rtnl_is_locked+0x15/0x20
[ 16.081841][ T230] ? netif_state_change+0x228/0x2c0
[ 16.082016][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 16.082224][ T230] ? generic_xdp_install+0x410/0x410
[ 16.082402][ T230] ? tun_chr_close+0xae/0x1c0
[ 16.082580][ T230] tun_chr_close+0xc0/0x1c0
[ 16.082758][ T230] __fput+0x35c/0xa70
[ 16.082904][ T230] fput_close_sync+0xdd/0x1b0
[ 16.083079][ T230] ? alloc_file_clone+0xf0/0xf0
[ 16.083253][ T230] __x64_sys_close+0x7d/0xd0
[ 16.083424][ T230] do_syscall_64+0xc1/0xfd0
[ 16.083598][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.083818][ T230] RIP: 0033:0x4901eb
[ 16.083972][ 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
[ 16.084540][ T230] RSP: 002b:00007ffd7c8b1e60 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 16.084800][ T230] RAX: ffffffffffffffda RBX: 00007ffd7c8b23c0 RCX: 00000000004901eb
[ 16.085052][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 16.085298][ T230] RBP: 00007ffd7c8b1ea0 R08: 0000000000000000 R09: 0000000000000000
[ 16.085553][ T230] R10: 0000000000000004 R11: 0000000000000293 R12: 00007ffd7c8b2338
[ 16.085811][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 16.086080][ T230]
[ 16.086229][ T230] irq event stamp: 1114971
[ 16.086487][ T230] hardirqs last enabled at (1114971): [] irqentry_exit+0x3b/0x80
[ 16.086778][ T230] hardirqs last disabled at (1114970): [] handle_softirqs+0x47f/0x610
[ 16.087096][ T230] softirqs last enabled at (1114784): [] __tun_set_ebpf+0xc6/0x180
[ 16.087469][ T230] softirqs last disabled at (1114782): [] __tun_set_ebpf+0x91/0x180
[ 16.087748][ T230] ---[ end trace 0000000000000000 ]---