[ 21.329729][ T231] ==================================================================
[ 21.330193][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 21.330463][ T231] Read of size 1 at addr ffff88800c1dc68c by task packetdrill/231
[ 21.330764][ T231]
[ 21.330862][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.330868][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.330870][ T231] Call Trace:
[ 21.330873][ T231]
[ 21.330875][ T231] dump_stack_lvl+0x82/0xc0
[ 21.330885][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 21.330893][ T231] ? kobject_put+0xbb/0xd0
[ 21.330898][ T231] print_report+0xb4/0x270
[ 21.330901][ T231] ? kobject_put+0xbb/0xd0
[ 21.330905][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 21.330908][ T231] ? kobject_put+0xbb/0xd0
[ 21.330912][ T231] kasan_report+0xca/0x100
[ 21.330916][ T231] ? kobject_put+0xbb/0xd0
[ 21.330921][ T231] kobject_put+0xbb/0xd0
[ 21.330925][ T231] netdev_run_todo+0x5f0/0xc60
[ 21.330931][ T231] ? rtnl_is_locked+0x15/0x20
[ 21.330935][ T231] ? netif_state_change+0x228/0x2c0
[ 21.330938][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 21.330941][ T231] ? generic_xdp_install+0x410/0x410
[ 21.330945][ T231] ? tun_chr_close+0xae/0x1c0
[ 21.330953][ T231] tun_chr_close+0xc0/0x1c0
[ 21.330956][ T231] __fput+0x35c/0xa70
[ 21.330965][ T231] fput_close_sync+0xdd/0x1b0
[ 21.330968][ T231] ? alloc_file_clone+0xf0/0xf0
[ 21.330972][ T231] __x64_sys_close+0x7d/0xd0
[ 21.330976][ T231] do_syscall_64+0xc1/0xfd0
[ 21.330983][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.330987][ T231] RIP: 0033:0x4901eb
[ 21.330993][ 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
[ 21.330996][ T231] RSP: 002b:00007fffd31aa100 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 21.331000][ T231] RAX: ffffffffffffffda RBX: 00007fffd31aa660 RCX: 00000000004901eb
[ 21.331002][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 21.331004][ T231] RBP: 00007fffd31aa140 R08: 0000000000000000 R09: 0000000000000000
[ 21.331006][ T231] R10: 0000000002000000 R11: 0000000000000293 R12: 00007fffd31aa5d8
[ 21.331008][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 21.331014][ T231]
[ 21.331015][ T231]
[ 21.338856][ T231] The buggy address belongs to the physical page:
[ 21.339151][ T231] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800c1dc100 pfn:0xc1dc
[ 21.339496][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 21.339677][ T231] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 21.340047][ T231] raw: ffff88800c1dc100 0000000000000000 00000001ffffffff 0000000000000000
[ 21.340338][ T231] page dumped because: kasan: bad access detected
[ 21.340563][ T231]
[ 21.340648][ T231] Memory state around the buggy address:
[ 21.340894][ T231] ffff88800c1dc580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.341146][ T231] ffff88800c1dc600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.341389][ T231] >ffff88800c1dc680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.341664][ T231] ^
[ 21.341835][ T231] ffff88800c1dc700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.342144][ T231] ffff88800c1dc780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.342477][ T231] ==================================================================
[ 21.342880][ T231] Disabling lock debugging due to kernel taint
[ 21.343475][ T231] ------------[ cut here ]------------
[ 21.343676][ T231] refcount_t: underflow; use-after-free.
[ 21.343974][ T231] WARNING: CPU: 0 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 21.344390][ T231] Modules linked in:
[ 21.344522][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.344971][ T231] Tainted: [B]=BAD_PAGE
[ 21.345139][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.345403][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 21.345731][ 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 c5 8e 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
[ 21.346601][ T231] RSP: 0018:ffffc90000b47ce8 EFLAGS: 00010282
[ 21.346807][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 21.347127][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 21.347441][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1ebe134
[ 21.347717][ T231] R10: 0000000000000003 R11: ffffc90000b47880 R12: 0000000000000001
[ 21.348084][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 21.348380][ T231] FS: 00000000244ff3c0(0000) GS:ffff88809fe1a000(0000) knlGS:0000000000000000
[ 21.348657][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.348865][ T231] CR2: 00007fb271786000 CR3: 0000000005064001 CR4: 0000000000772ef0
[ 21.349117][ T231] PKRU: 55555554
[ 21.349250][ T231] Call Trace:
[ 21.349375][ T231]
[ 21.349479][ T231] netdev_run_todo+0x5f0/0xc60
[ 21.349651][ T231] ? rtnl_is_locked+0x15/0x20
[ 21.349826][ T231] ? netif_state_change+0x228/0x2c0
[ 21.349997][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 21.350197][ T231] ? generic_xdp_install+0x410/0x410
[ 21.350382][ T231] ? tun_chr_close+0xae/0x1c0
[ 21.350591][ T231] tun_chr_close+0xc0/0x1c0
[ 21.350810][ T231] __fput+0x35c/0xa70
[ 21.350981][ T231] fput_close_sync+0xdd/0x1b0
[ 21.351181][ T231] ? alloc_file_clone+0xf0/0xf0
[ 21.351413][ T231] __x64_sys_close+0x7d/0xd0
[ 21.351636][ T231] do_syscall_64+0xc1/0xfd0
[ 21.351901][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.352250][ T231] RIP: 0033:0x4901eb
[ 21.352466][ 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
[ 21.353438][ T231] RSP: 002b:00007fffd31aa100 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 21.353825][ T231] RAX: ffffffffffffffda RBX: 00007fffd31aa660 RCX: 00000000004901eb
[ 21.354223][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 21.354480][ T231] RBP: 00007fffd31aa140 R08: 0000000000000000 R09: 0000000000000000
[ 21.354753][ T231] R10: 0000000002000000 R11: 0000000000000293 R12: 00007fffd31aa5d8
[ 21.355034][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 21.355345][ T231]
[ 21.355489][ T231] irq event stamp: 1534957
[ 21.355733][ T231] hardirqs last enabled at (1534957): [] irqentry_exit+0x3b/0x80
[ 21.356189][ T231] hardirqs last disabled at (1534956): [] handle_softirqs+0x47f/0x610
[ 21.356658][ T231] softirqs last enabled at (1534766): [] __tun_set_ebpf+0xc6/0x180
[ 21.357124][ T231] softirqs last disabled at (1534764): [] __tun_set_ebpf+0x91/0x180
[ 21.357604][ T231] ---[ end trace 0000000000000000 ]---