[ 21.267753][ T230] ==================================================================
[ 21.268291][ T230] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 21.268640][ T230] Read of size 1 at addr ffff88800a03868c by task packetdrill/230
[ 21.269034][ T230]
[ 21.269180][ T230] CPU: 0 UID: 0 PID: 230 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.269188][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.269191][ T230] Call Trace:
[ 21.269194][ T230]
[ 21.269198][ T230] dump_stack_lvl+0x82/0xc0
[ 21.269208][ T230] print_address_description.constprop.0+0x2c/0x3a0
[ 21.269219][ T230] ? kobject_put+0xbb/0xd0
[ 21.269225][ T230] print_report+0xb4/0x270
[ 21.269230][ T230] ? kobject_put+0xbb/0xd0
[ 21.269235][ T230] ? kasan_addr_to_slab+0x21/0x70
[ 21.269241][ T230] ? kobject_put+0xbb/0xd0
[ 21.269246][ T230] kasan_report+0xca/0x100
[ 21.269252][ T230] ? kobject_put+0xbb/0xd0
[ 21.269262][ T230] kobject_put+0xbb/0xd0
[ 21.269267][ T230] netdev_run_todo+0x5f0/0xc60
[ 21.269275][ T230] ? rtnl_is_locked+0x15/0x20
[ 21.269281][ T230] ? netif_state_change+0x228/0x2c0
[ 21.269286][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 21.269292][ T230] ? generic_xdp_install+0x410/0x410
[ 21.269300][ T230] ? tun_chr_close+0xae/0x1c0
[ 21.269313][ T230] tun_chr_close+0xc0/0x1c0
[ 21.269320][ T230] __fput+0x35c/0xa70
[ 21.269331][ T230] fput_close_sync+0xdd/0x1b0
[ 21.269337][ T230] ? alloc_file_clone+0xf0/0xf0
[ 21.269345][ T230] __x64_sys_close+0x7d/0xd0
[ 21.269352][ T230] do_syscall_64+0xc1/0xfd0
[ 21.269361][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.269367][ T230] RIP: 0033:0x4901eb
[ 21.269373][ 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
[ 21.269377][ T230] RSP: 002b:00007fffb7d193c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 21.269384][ T230] RAX: ffffffffffffffda RBX: 00007fffb7d19920 RCX: 00000000004901eb
[ 21.269387][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 21.269390][ T230] RBP: 00007fffb7d19400 R08: 0000000000000000 R09: 0000000000000000
[ 21.269392][ T230] R10: 0000000002000000 R11: 0000000000000293 R12: 00007fffb7d19898
[ 21.269394][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 21.269406][ T230]
[ 21.269408][ T230]
[ 21.280211][ T230] The buggy address belongs to the physical page:
[ 21.280514][ T230] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800a03b4c0 pfn:0xa038
[ 21.281049][ T230] flags: 0x80000000000000(node=0|zone=1)
[ 21.281315][ T230] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 21.281813][ T230] raw: ffff88800a03b4c0 0000000000000000 00000001ffffffff 0000000000000000
[ 21.282307][ T230] page dumped because: kasan: bad access detected
[ 21.282641][ T230]
[ 21.282784][ T230] Memory state around the buggy address:
[ 21.283051][ T230] ffff88800a038580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.283454][ T230] ffff88800a038600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.283837][ T230] >ffff88800a038680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.284229][ T230] ^
[ 21.284451][ T230] ffff88800a038700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.284849][ T230] ffff88800a038780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.285242][ T230] ==================================================================
[ 21.285700][ T230] Disabling lock debugging due to kernel taint
[ 21.286040][ T230] ------------[ cut here ]------------
[ 21.286317][ T230] refcount_t: underflow; use-after-free.
[ 21.286588][ T230] WARNING: CPU: 0 PID: 230 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 21.287036][ T230] Modules linked in:
[ 21.287234][ T230] CPU: 0 UID: 0 PID: 230 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.287808][ T230] Tainted: [B]=BAD_PAGE
[ 21.288014][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.288352][ T230] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 21.288709][ 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 65 8a 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
[ 21.289672][ T230] RSP: 0018:ffffc90000ac7ce8 EFLAGS: 00010282
[ 21.290007][ T230] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 21.290410][ T230] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 21.290819][ T230] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff15fe134
[ 21.291215][ T230] R10: 0000000000000003 R11: ffffc90000ac7880 R12: 0000000000000001
[ 21.291618][ T230] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 21.292043][ T230] FS: 0000000027d733c0(0000) GS:ffff8880a9e1a000(0000) knlGS:0000000000000000
[ 21.292517][ T230] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.292873][ T230] CR2: 00007f402d90b000 CR3: 000000000c0f7006 CR4: 0000000000772ef0
[ 21.293275][ T230] PKRU: 55555554
[ 21.293476][ T230] Call Trace:
[ 21.293672][ T230]
[ 21.293813][ T230] netdev_run_todo+0x5f0/0xc60
[ 21.294086][ T230] ? rtnl_is_locked+0x15/0x20
[ 21.294357][ T230] ? netif_state_change+0x228/0x2c0
[ 21.294619][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 21.294958][ T230] ? generic_xdp_install+0x410/0x410
[ 21.295226][ T230] ? tun_chr_close+0xae/0x1c0
[ 21.295493][ T230] tun_chr_close+0xc0/0x1c0
[ 21.295751][ T230] __fput+0x35c/0xa70
[ 21.295973][ T230] fput_close_sync+0xdd/0x1b0
[ 21.296234][ T230] ? alloc_file_clone+0xf0/0xf0
[ 21.296497][ T230] __x64_sys_close+0x7d/0xd0
[ 21.296757][ T230] do_syscall_64+0xc1/0xfd0
[ 21.297038][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.297360][ T230] RIP: 0033:0x4901eb
[ 21.297566][ 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
[ 21.298495][ T230] RSP: 002b:00007fffb7d193c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 21.298900][ T230] RAX: ffffffffffffffda RBX: 00007fffb7d19920 RCX: 00000000004901eb
[ 21.299287][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 21.299678][ T230] RBP: 00007fffb7d19400 R08: 0000000000000000 R09: 0000000000000000
[ 21.300087][ T230] R10: 0000000002000000 R11: 0000000000000293 R12: 00007fffb7d19898
[ 21.300481][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 21.300888][ T230]
[ 21.301090][ T230] irq event stamp: 1790951
[ 21.301351][ T230] hardirqs last enabled at (1790951): [] irqentry_exit+0x3b/0x80
[ 21.301820][ T230] hardirqs last disabled at (1790950): [] handle_softirqs+0x47f/0x610
[ 21.302286][ T230] softirqs last enabled at (1790766): [] __tun_set_ebpf+0xc6/0x180
[ 21.302724][ T230] softirqs last disabled at (1790764): [] __tun_set_ebpf+0x91/0x180
[ 21.303191][ T230] ---[ end trace 0000000000000000 ]---
[ 21.309906][ T230] packetdrill (230) used greatest stack depth: 23952 bytes left