[ 15.531235][ T231] ==================================================================
[ 15.531530][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 15.531742][ T231] Read of size 1 at addr ffff8880090a468c by task packetdrill/231
[ 15.531999][ T231]
[ 15.532086][ T231] CPU: 2 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.532091][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.532093][ T231] Call Trace:
[ 15.532096][ T231]
[ 15.532098][ T231] dump_stack_lvl+0x82/0xc0
[ 15.532103][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 15.532112][ T231] ? kobject_put+0xbb/0xd0
[ 15.532116][ T231] print_report+0xb4/0x270
[ 15.532119][ T231] ? kobject_put+0xbb/0xd0
[ 15.532122][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 15.532126][ T231] ? kobject_put+0xbb/0xd0
[ 15.532129][ T231] kasan_report+0xca/0x100
[ 15.532133][ T231] ? kobject_put+0xbb/0xd0
[ 15.532138][ T231] kobject_put+0xbb/0xd0
[ 15.532142][ T231] netdev_run_todo+0x5f0/0xc60
[ 15.532148][ T231] ? rtnl_is_locked+0x15/0x20
[ 15.532152][ T231] ? netif_state_change+0x228/0x2c0
[ 15.532155][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 15.532158][ T231] ? generic_xdp_install+0x410/0x410
[ 15.532162][ T231] ? tun_chr_close+0xae/0x1c0
[ 15.532170][ T231] tun_chr_close+0xc0/0x1c0
[ 15.532174][ T231] __fput+0x35c/0xa70
[ 15.532182][ T231] fput_close_sync+0xdd/0x1b0
[ 15.532186][ T231] ? alloc_file_clone+0xf0/0xf0
[ 15.532190][ T231] __x64_sys_close+0x7d/0xd0
[ 15.532194][ T231] do_syscall_64+0xc1/0xfd0
[ 15.532201][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.532205][ T231] RIP: 0033:0x4901eb
[ 15.532209][ 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
[ 15.532212][ T231] RSP: 002b:00007fffa6976560 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 15.532216][ T231] RAX: ffffffffffffffda RBX: 00007fffa6976ac0 RCX: 00000000004901eb
[ 15.532218][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 15.532220][ T231] RBP: 00007fffa69765a0 R08: 0000000000000000 R09: 0000000000000000
[ 15.532222][ T231] R10: 000000002b414c30 R11: 0000000000000293 R12: 00007fffa6976a38
[ 15.532224][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 15.532231][ T231]
[ 15.532232][ T231]
[ 15.538998][ T231] The buggy address belongs to the physical page:
[ 15.539201][ T231] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880090a7a00 pfn:0x90a4
[ 15.539546][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 15.539729][ T231] raw: 0080000000000000 ffffea000017c808 ffff88803633bc40 0000000000000000
[ 15.540030][ T231] raw: ffff8880090a7a00 0000000000000000 00000000ffffffff 0000000000000000
[ 15.540326][ T231] page dumped because: kasan: bad access detected
[ 15.540540][ T231]
[ 15.540626][ T231] Memory state around the buggy address:
[ 15.540791][ T231] ffff8880090a4580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.541042][ T231] ffff8880090a4600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.541283][ T231] >ffff8880090a4680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.541518][ T231] ^
[ 15.541642][ T231] ffff8880090a4700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.541890][ T231] ffff8880090a4780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.542127][ T231] ==================================================================
[ 15.542433][ T231] Disabling lock debugging due to kernel taint
[ 15.542666][ T231] ------------[ cut here ]------------
[ 15.542848][ T231] refcount_t: underflow; use-after-free.
[ 15.543070][ T231] WARNING: CPU: 2 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 15.543388][ T231] Modules linked in:
[ 15.543546][ T231] CPU: 2 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.543942][ T231] Tainted: [B]=BAD_PAGE
[ 15.544098][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.544328][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 15.544561][ 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 45 b6 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
[ 15.545173][ T231] RSP: 0018:ffffc90000737ce8 EFLAGS: 00010282
[ 15.545405][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 15.545675][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 15.545945][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff6dbe134
[ 15.546222][ T231] R10: 0000000000000003 R11: ffffc90000737880 R12: 0000000000000001
[ 15.546498][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 15.546768][ T231] FS: 000000002b4083c0(0000) GS:ffff88807e11a000(0000) knlGS:0000000000000000
[ 15.547085][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 15.547312][ T231] CR2: 00007f7e87c48000 CR3: 00000000093f6006 CR4: 0000000000772ef0
[ 15.547579][ T231] PKRU: 55555554
[ 15.547725][ T231] Call Trace:
[ 15.547878][ T231]
[ 15.547987][ T231] netdev_run_todo+0x5f0/0xc60
[ 15.548188][ T231] ? rtnl_is_locked+0x15/0x20
[ 15.548376][ T231] ? netif_state_change+0x228/0x2c0
[ 15.548562][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 15.548788][ T231] ? generic_xdp_install+0x410/0x410
[ 15.548972][ T231] ? tun_chr_close+0xae/0x1c0
[ 15.549169][ T231] tun_chr_close+0xc0/0x1c0
[ 15.549356][ T231] __fput+0x35c/0xa70
[ 15.549510][ T231] fput_close_sync+0xdd/0x1b0
[ 15.549696][ T231] ? alloc_file_clone+0xf0/0xf0
[ 15.549889][ T231] __x64_sys_close+0x7d/0xd0
[ 15.550083][ T231] do_syscall_64+0xc1/0xfd0
[ 15.550270][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.550497][ T231] RIP: 0033:0x4901eb
[ 15.550652][ 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
[ 15.551270][ T231] RSP: 002b:00007fffa6976560 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 15.551541][ T231] RAX: ffffffffffffffda RBX: 00007fffa6976ac0 RCX: 00000000004901eb
[ 15.551814][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 15.552089][ T231] RBP: 00007fffa69765a0 R08: 0000000000000000 R09: 0000000000000000
[ 15.552361][ T231] R10: 000000002b414c30 R11: 0000000000000293 R12: 00007fffa6976a38
[ 15.552629][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 15.552900][ T231]
[ 15.553054][ T231] irq event stamp: 1827369
[ 15.553237][ T231] hardirqs last enabled at (1827369): [] irqentry_exit+0x3b/0x80
[ 15.553550][ T231] hardirqs last disabled at (1827368): [] handle_softirqs+0x47f/0x610
[ 15.553859][ T231] softirqs last enabled at (1827180): [] __tun_set_ebpf+0xc6/0x180
[ 15.554172][ T231] softirqs last disabled at (1827178): [] __tun_set_ebpf+0x91/0x180
[ 15.554477][ T231] ---[ end trace 0000000000000000 ]---