[ 19.990528][ T233] ==================================================================
[ 19.990934][ T233] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 19.991283][ T233] Read of size 1 at addr ffff88800248c68c by task packetdrill/233
[ 19.991547][ T233]
[ 19.991684][ T233] CPU: 0 UID: 0 PID: 233 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 19.991689][ T233] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 19.991693][ T233] Call Trace:
[ 19.991695][ T233]
[ 19.991697][ T233] dump_stack_lvl+0x82/0xc0
[ 19.991705][ T233] print_address_description.constprop.0+0x2c/0x3a0
[ 19.991713][ T233] ? kobject_put+0xbb/0xd0
[ 19.991718][ T233] print_report+0xb4/0x270
[ 19.991721][ T233] ? kobject_put+0xbb/0xd0
[ 19.991725][ T233] ? kasan_addr_to_slab+0x21/0x70
[ 19.991728][ T233] ? kobject_put+0xbb/0xd0
[ 19.991731][ T233] kasan_report+0xca/0x100
[ 19.991735][ T233] ? kobject_put+0xbb/0xd0
[ 19.991741][ T233] kobject_put+0xbb/0xd0
[ 19.991744][ T233] netdev_run_todo+0x5f0/0xc60
[ 19.991751][ T233] ? rtnl_is_locked+0x15/0x20
[ 19.991755][ T233] ? netif_state_change+0x228/0x2c0
[ 19.991758][ T233] ? call_netdevice_notifiers_info+0x100/0x100
[ 19.991761][ T233] ? generic_xdp_install+0x410/0x410
[ 19.991766][ T233] ? tun_chr_close+0xae/0x1c0
[ 19.991774][ T233] tun_chr_close+0xc0/0x1c0
[ 19.991778][ T233] __fput+0x35c/0xa70
[ 19.991786][ T233] fput_close_sync+0xdd/0x1b0
[ 19.991790][ T233] ? alloc_file_clone+0xf0/0xf0
[ 19.991794][ T233] __x64_sys_close+0x7d/0xd0
[ 19.991798][ T233] do_syscall_64+0xc1/0xfd0
[ 19.991804][ T233] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 19.991809][ T233] RIP: 0033:0x4901eb
[ 19.991815][ T233] 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
[ 19.991817][ T233] RSP: 002b:00007ffd59e71920 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 19.991822][ T233] RAX: ffffffffffffffda RBX: 00007ffd59e71e80 RCX: 00000000004901eb
[ 19.991824][ T233] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 19.991826][ T233] RBP: 00007ffd59e71960 R08: 0000000000000000 R09: 0000000000000000
[ 19.991827][ T233] R10: 0000000033e11260 R11: 0000000000000293 R12: 00007ffd59e71df8
[ 19.991829][ T233] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 19.991836][ T233]
[ 19.991837][ T233]
[ 19.999529][ T233] The buggy address belongs to the physical page:
[ 19.999773][ T233] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88800248df00 pfn:0x248c
[ 20.000167][ T233] flags: 0x80000000000000(node=0|zone=1)
[ 20.000390][ T233] raw: 0080000000000000 ffffea000032f108 ffff88803083bc40 0000000000000000
[ 20.000733][ T233] raw: ffff88800248df00 0000000000000000 00000000ffffffff 0000000000000000
[ 20.001072][ T233] page dumped because: kasan: bad access detected
[ 20.001340][ T233]
[ 20.001451][ T233] Memory state around the buggy address:
[ 20.001637][ T233] ffff88800248c580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.001913][ T233] ffff88800248c600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.002249][ T233] >ffff88800248c680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.002543][ T233] ^
[ 20.002681][ T233] ffff88800248c700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.002959][ T233] ffff88800248c780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.003258][ T233] ==================================================================
[ 20.003680][ T233] Disabling lock debugging due to kernel taint
[ 20.003913][ T233] ------------[ cut here ]------------
[ 20.004115][ T233] refcount_t: underflow; use-after-free.
[ 20.004342][ T233] WARNING: CPU: 0 PID: 233 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 20.004684][ T233] Modules linked in:
[ 20.004833][ T233] CPU: 0 UID: 0 PID: 233 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.005278][ T233] Tainted: [B]=BAD_PAGE
[ 20.005428][ T233] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.005670][ T233] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 20.005941][ T233] 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 c5 85 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
[ 20.006622][ T233] RSP: 0018:ffffc90000aa7ce8 EFLAGS: 00010282
[ 20.006856][ T233] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 20.007151][ T233] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 20.007440][ T233] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff0cbe134
[ 20.007718][ T233] R10: 0000000000000003 R11: ffffc90000aa7880 R12: 0000000000000001
[ 20.008009][ T233] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 20.008305][ T233] FS: 0000000033e093c0(0000) GS:ffff8880a8e1a000(0000) knlGS:0000000000000000
[ 20.008631][ T233] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 20.008867][ T233] CR2: 00007f86d8675000 CR3: 0000000001d8a004 CR4: 0000000000772ef0
[ 20.009169][ T233] PKRU: 55555554
[ 20.009346][ T233] Call Trace:
[ 20.009505][ T233]
[ 20.009609][ T233] netdev_run_todo+0x5f0/0xc60
[ 20.009806][ T233] ? rtnl_is_locked+0x15/0x20
[ 20.010027][ T233] ? netif_state_change+0x228/0x2c0
[ 20.010218][ T233] ? call_netdevice_notifiers_info+0x100/0x100
[ 20.010482][ T233] ? generic_xdp_install+0x410/0x410
[ 20.010669][ T233] ? tun_chr_close+0xae/0x1c0
[ 20.010868][ T233] tun_chr_close+0xc0/0x1c0
[ 20.011079][ T233] __fput+0x35c/0xa70
[ 20.011253][ T233] fput_close_sync+0xdd/0x1b0
[ 20.011528][ T233] ? alloc_file_clone+0xf0/0xf0
[ 20.011756][ T233] __x64_sys_close+0x7d/0xd0
[ 20.011936][ T233] do_syscall_64+0xc1/0xfd0
[ 20.012226][ T233] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.012461][ T233] RIP: 0033:0x4901eb
[ 20.012611][ T233] 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
[ 20.013374][ T233] RSP: 002b:00007ffd59e71920 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 20.013665][ T233] RAX: ffffffffffffffda RBX: 00007ffd59e71e80 RCX: 00000000004901eb
[ 20.014044][ T233] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 20.014358][ T233] RBP: 00007ffd59e71960 R08: 0000000000000000 R09: 0000000000000000
[ 20.014726][ T233] R10: 0000000033e11260 R11: 0000000000000293 R12: 00007ffd59e71df8
[ 20.015118][ T233] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 20.015436][ T233]
[ 20.015577][ T233] irq event stamp: 1984567
[ 20.015859][ T233] hardirqs last enabled at (1984567): [] irqentry_exit+0x3b/0x80
[ 20.016204][ T233] hardirqs last disabled at (1984566): [] handle_softirqs+0x47f/0x610
[ 20.016621][ T233] softirqs last enabled at (1984228): [] __tun_set_ebpf+0xc6/0x180
[ 20.016937][ T233] softirqs last disabled at (1984226): [] __tun_set_ebpf+0x91/0x180
[ 20.017289][ T233] ---[ end trace 0000000000000000 ]---