[ 19.011939][ T231] ==================================================================
[ 19.012461][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 19.012827][ T231] Read of size 1 at addr ffff88800bf5c68c by task packetdrill/231
[ 19.013234][ T231]
[ 19.013380][ T231] CPU: 3 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 19.013389][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 19.013393][ T231] Call Trace:
[ 19.013396][ T231]
[ 19.013400][ T231] dump_stack_lvl+0x82/0xc0
[ 19.013410][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 19.013421][ T231] ? kobject_put+0xbb/0xd0
[ 19.013428][ T231] print_report+0xb4/0x270
[ 19.013433][ T231] ? kobject_put+0xbb/0xd0
[ 19.013438][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 19.013443][ T231] ? kobject_put+0xbb/0xd0
[ 19.013448][ T231] kasan_report+0xca/0x100
[ 19.013455][ T231] ? kobject_put+0xbb/0xd0
[ 19.013465][ T231] kobject_put+0xbb/0xd0
[ 19.013471][ T231] netdev_run_todo+0x5f0/0xc60
[ 19.013479][ T231] ? rtnl_is_locked+0x15/0x20
[ 19.013485][ T231] ? netif_state_change+0x228/0x2c0
[ 19.013490][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 19.013495][ T231] ? generic_xdp_install+0x410/0x410
[ 19.013502][ T231] ? tun_chr_close+0xae/0x1c0
[ 19.013514][ T231] tun_chr_close+0xc0/0x1c0
[ 19.013521][ T231] __fput+0x35c/0xa70
[ 19.013534][ T231] fput_close_sync+0xdd/0x1b0
[ 19.013539][ T231] ? alloc_file_clone+0xf0/0xf0
[ 19.013549][ T231] __x64_sys_close+0x7d/0xd0
[ 19.013554][ T231] do_syscall_64+0xc1/0xfd0
[ 19.013562][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 19.013569][ T231] RIP: 0033:0x4901eb
[ 19.013576][ T231] 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
[ 19.013580][ T231] RSP: 002b:00007ffddf9476d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 19.013588][ T231] RAX: ffffffffffffffda RBX: 00007ffddf947c30 RCX: 00000000004901eb
[ 19.013592][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 19.013594][ T231] RBP: 00007ffddf947710 R08: 0000000000000000 R09: 0000000000000000
[ 19.013598][ T231] R10: 0000000001000000 R11: 0000000000000293 R12: 00007ffddf947ba8
[ 19.013601][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 19.013613][ T231]
[ 19.013616][ T231]
[ 19.024908][ T231] The buggy address belongs to the physical page:
[ 19.025266][ T231] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88800bf5f100 pfn:0xbf5c
[ 19.025844][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 19.026125][ T231] raw: 0080000000000000 ffffea00002f7908 ffff8880363bbc40 0000000000000000
[ 19.026613][ T231] raw: ffff88800bf5f100 0000000000000000 00000000ffffffff 0000000000000000
[ 19.027114][ T231] page dumped because: kasan: bad access detected
[ 19.027455][ T231]
[ 19.027605][ T231] Memory state around the buggy address:
[ 19.027899][ T231] ffff88800bf5c580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 19.028306][ T231] ffff88800bf5c600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 19.028712][ T231] >ffff88800bf5c680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 19.029113][ T231] ^
[ 19.029315][ T231] ffff88800bf5c700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 19.029728][ T231] ffff88800bf5c780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 19.030122][ T231] ==================================================================
[ 19.030710][ T231] Disabling lock debugging due to kernel taint
[ 19.031047][ T231] ------------[ cut here ]------------
[ 19.031309][ T231] refcount_t: underflow; use-after-free.
[ 19.031621][ T231] WARNING: CPU: 3 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 19.032126][ T231] Modules linked in:
[ 19.032344][ T231] CPU: 3 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 19.033016][ T231] Tainted: [B]=BAD_PAGE
[ 19.033234][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 19.033601][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 19.033978][ T231] 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 05 8f 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
[ 19.035029][ T231] RSP: 0018:ffffc90000af7ce8 EFLAGS: 00010282
[ 19.035414][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 19.035867][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 19.036300][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1f3e134
[ 19.036742][ T231] R10: 0000000000000003 R11: ffffc90000af7880 R12: 0000000000000001
[ 19.037142][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 19.037580][ T231] FS: 000000001a6853c0(0000) GS:ffff8880a559a000(0000) knlGS:0000000000000000
[ 19.038078][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 19.038453][ T231] CR2: 00007f2ea65f5000 CR3: 00000000090ec001 CR4: 0000000000772ef0
[ 19.038895][ T231] PKRU: 55555554
[ 19.039103][ T231] Call Trace:
[ 19.039306][ T231]
[ 19.039448][ T231] netdev_run_todo+0x5f0/0xc60
[ 19.039730][ T231] ? rtnl_is_locked+0x15/0x20
[ 19.040010][ T231] ? netif_state_change+0x228/0x2c0
[ 19.040275][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 19.040620][ T231] ? generic_xdp_install+0x410/0x410
[ 19.040898][ T231] ? tun_chr_close+0xae/0x1c0
[ 19.041179][ T231] tun_chr_close+0xc0/0x1c0
[ 19.041450][ T231] __fput+0x35c/0xa70
[ 19.041676][ T231] fput_close_sync+0xdd/0x1b0
[ 19.041966][ T231] ? alloc_file_clone+0xf0/0xf0
[ 19.042238][ T231] __x64_sys_close+0x7d/0xd0
[ 19.042521][ T231] do_syscall_64+0xc1/0xfd0
[ 19.042805][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 19.043152][ T231] RIP: 0033:0x4901eb
[ 19.043360][ T231] 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
[ 19.044357][ T231] RSP: 002b:00007ffddf9476d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 19.044783][ T231] RAX: ffffffffffffffda RBX: 00007ffddf947c30 RCX: 00000000004901eb
[ 19.045219][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 19.045678][ T231] RBP: 00007ffddf947710 R08: 0000000000000000 R09: 0000000000000000
[ 19.046102][ T231] R10: 0000000001000000 R11: 0000000000000293 R12: 00007ffddf947ba8
[ 19.046533][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 19.046977][ T231]
[ 19.047366][ T231] irq event stamp: 1935245
[ 19.047655][ T231] hardirqs last enabled at (1935245): [] irqentry_exit+0x3b/0x80
[ 19.048130][ T231] hardirqs last disabled at (1935244): [] handle_softirqs+0x47f/0x610
[ 19.048789][ T231] softirqs last enabled at (1935022): [] handle_softirqs+0x352/0x610
[ 19.049249][ T231] softirqs last disabled at (1935015): [] irq_exit_rcu+0xab/0x100
[ 19.049879][ T231] ---[ end trace 0000000000000000 ]---