[ 20.020197][ T232] ==================================================================
[ 20.020658][ T232] BUG: KASAN: out-of-bounds in kobject_put+0xbb/0xd0
[ 20.021025][ T232] Read of size 1 at addr ffff88800c23c68c by task packetdrill/232
[ 20.021389][ T232]
[ 20.021533][ T232] CPU: 2 UID: 0 PID: 232 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.021545][ T232] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.021549][ T232] Call Trace:
[ 20.021552][ T232]
[ 20.021555][ T232] dump_stack_lvl+0x82/0xc0
[ 20.021569][ T232] print_address_description.constprop.0+0x2c/0x3a0
[ 20.021580][ T232] ? kobject_put+0xbb/0xd0
[ 20.021587][ T232] print_report+0xb4/0x270
[ 20.021592][ T232] ? kobject_put+0xbb/0xd0
[ 20.021597][ T232] ? kasan_addr_to_slab+0x21/0x70
[ 20.021604][ T232] ? kobject_put+0xbb/0xd0
[ 20.021608][ T232] kasan_report+0xca/0x100
[ 20.021615][ T232] ? kobject_put+0xbb/0xd0
[ 20.021623][ T232] kobject_put+0xbb/0xd0
[ 20.021628][ T232] netdev_run_todo+0x5f0/0xc60
[ 20.021639][ T232] ? rtnl_is_locked+0x15/0x20
[ 20.021645][ T232] ? netif_state_change+0x228/0x2c0
[ 20.021650][ T232] ? call_netdevice_notifiers_info+0x100/0x100
[ 20.021655][ T232] ? generic_xdp_install+0x410/0x410
[ 20.021662][ T232] ? tun_chr_close+0xae/0x1c0
[ 20.021674][ T232] tun_chr_close+0xc0/0x1c0
[ 20.021681][ T232] __fput+0x35c/0xa70
[ 20.021693][ T232] fput_close_sync+0xdd/0x1b0
[ 20.021698][ T232] ? alloc_file_clone+0xf0/0xf0
[ 20.021708][ T232] __x64_sys_close+0x7d/0xd0
[ 20.021714][ T232] do_syscall_64+0xc1/0xfd0
[ 20.021723][ T232] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.021733][ T232] RIP: 0033:0x4901eb
[ 20.021743][ T232] 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
[ 20.021747][ T232] RSP: 002b:00007ffd48067cd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 20.021754][ T232] RAX: ffffffffffffffda RBX: 00007ffd48068230 RCX: 00000000004901eb
[ 20.021758][ T232] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 20.021761][ T232] RBP: 00007ffd48067d10 R08: 0000000000000000 R09: 0000000000000000
[ 20.021765][ T232] R10: 0000000001000000 R11: 0000000000000293 R12: 00007ffd480681a8
[ 20.021768][ T232] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 20.021780][ T232]
[ 20.021782][ T232]
[ 20.032024][ T232] The buggy address belongs to the physical page:
[ 20.032356][ T232] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xc23c
[ 20.032890][ T232] flags: 0x80000000000000(node=0|zone=1)
[ 20.033201][ T232] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 20.033692][ T232] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
[ 20.034168][ T232] page dumped because: kasan: bad access detected
[ 20.034521][ T232]
[ 20.034657][ T232] Memory state around the buggy address:
[ 20.034921][ T232] ffff88800c23c580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.035317][ T232] ffff88800c23c600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.035702][ T232] >ffff88800c23c680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.036103][ T232] ^
[ 20.036362][ T232] ffff88800c23c700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.036740][ T232] ffff88800c23c780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.037104][ T232] ==================================================================
[ 20.037554][ T232] Disabling lock debugging due to kernel taint
[ 20.037917][ T232] ------------[ cut here ]------------
[ 20.038193][ T232] refcount_t: underflow; use-after-free.
[ 20.038595][ T232] WARNING: CPU: 2 PID: 232 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 20.039075][ T232] Modules linked in:
[ 20.039325][ T232] CPU: 2 UID: 0 PID: 232 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.039901][ T232] Tainted: [B]=BAD_PAGE
[ 20.040124][ T232] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.040459][ T232] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 20.040787][ T232] 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 8c 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
[ 20.041692][ T232] RSP: 0018:ffffc90000ae7ce8 EFLAGS: 00010282
[ 20.042015][ T232] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 20.042433][ T232] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 20.042818][ T232] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1abe134
[ 20.043228][ T232] R10: 0000000000000003 R11: ffffc90000ae7880 R12: 0000000000000001
[ 20.043621][ T232] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 20.044007][ T232] FS: 00000000154323c0(0000) GS:ffff8880a791a000(0000) knlGS:0000000000000000
[ 20.044460][ T232] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 20.044800][ T232] CR2: 00007fdc24ab9000 CR3: 000000000aade004 CR4: 0000000000772ef0
[ 20.045191][ T232] PKRU: 55555554
[ 20.045414][ T232] Call Trace:
[ 20.045629][ T232]
[ 20.045777][ T232] netdev_run_todo+0x5f0/0xc60
[ 20.046034][ T232] ? rtnl_is_locked+0x15/0x20
[ 20.046318][ T232] ? netif_state_change+0x228/0x2c0
[ 20.046582][ T232] ? call_netdevice_notifiers_info+0x100/0x100
[ 20.046907][ T232] ? generic_xdp_install+0x410/0x410
[ 20.047182][ T232] ? tun_chr_close+0xae/0x1c0
[ 20.047469][ T232] tun_chr_close+0xc0/0x1c0
[ 20.047737][ T232] __fput+0x35c/0xa70
[ 20.047958][ T232] fput_close_sync+0xdd/0x1b0
[ 20.048241][ T232] ? alloc_file_clone+0xf0/0xf0
[ 20.048514][ T232] __x64_sys_close+0x7d/0xd0
[ 20.048774][ T232] do_syscall_64+0xc1/0xfd0
[ 20.049034][ T232] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.049372][ T232] RIP: 0033:0x4901eb
[ 20.049605][ T232] 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
[ 20.050494][ T232] RSP: 002b:00007ffd48067cd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 20.050926][ T232] RAX: ffffffffffffffda RBX: 00007ffd48068230 RCX: 00000000004901eb
[ 20.051355][ T232] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 20.051762][ T232] RBP: 00007ffd48067d10 R08: 0000000000000000 R09: 0000000000000000
[ 20.052176][ T232] R10: 0000000001000000 R11: 0000000000000293 R12: 00007ffd480681a8
[ 20.052567][ T232] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 20.052975][ T232]
[ 20.053196][ T232] irq event stamp: 1802495
[ 20.053482][ T232] hardirqs last enabled at (1802495): [] irqentry_exit+0x3b/0x80
[ 20.053990][ T232] hardirqs last disabled at (1802494): [] common_interrupt+0x19/0xe0
[ 20.054463][ T232] softirqs last enabled at (1802312): [] __tun_set_ebpf+0xc6/0x180
[ 20.054921][ T232] softirqs last disabled at (1802310): [] __tun_set_ebpf+0x91/0x180
[ 20.055387][ T232] ---[ end trace 0000000000000000 ]---