[ 21.757574][ T230] ==================================================================
[ 21.758107][ T230] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 21.758449][ T230] Read of size 1 at addr ffff888004a7868c by task packetdrill/230
[ 21.758850][ T230]
[ 21.759033][ T230] CPU: 3 UID: 0 PID: 230 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.759041][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.759045][ T230] Call Trace:
[ 21.759048][ T230]
[ 21.759051][ T230] dump_stack_lvl+0x82/0xc0
[ 21.759060][ T230] print_address_description.constprop.0+0x2c/0x3a0
[ 21.759069][ T230] ? kobject_put+0xbb/0xd0
[ 21.759076][ T230] print_report+0xb4/0x270
[ 21.759081][ T230] ? kobject_put+0xbb/0xd0
[ 21.759086][ T230] ? kasan_addr_to_slab+0x21/0x70
[ 21.759092][ T230] ? kobject_put+0xbb/0xd0
[ 21.759097][ T230] kasan_report+0xca/0x100
[ 21.759103][ T230] ? kobject_put+0xbb/0xd0
[ 21.759113][ T230] kobject_put+0xbb/0xd0
[ 21.759118][ T230] netdev_run_todo+0x5f0/0xc60
[ 21.759125][ T230] ? rtnl_is_locked+0x15/0x20
[ 21.759130][ T230] ? netif_state_change+0x228/0x2c0
[ 21.759136][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 21.759141][ T230] ? generic_xdp_install+0x410/0x410
[ 21.759147][ T230] ? tun_chr_close+0xae/0x1c0
[ 21.759157][ T230] tun_chr_close+0xc0/0x1c0
[ 21.759163][ T230] __fput+0x35c/0xa70
[ 21.759174][ T230] fput_close_sync+0xdd/0x1b0
[ 21.759179][ T230] ? alloc_file_clone+0xf0/0xf0
[ 21.759188][ T230] __x64_sys_close+0x7d/0xd0
[ 21.759194][ T230] do_syscall_64+0xc1/0xfd0
[ 21.759201][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.759207][ T230] RIP: 0033:0x4901eb
[ 21.759213][ T230] 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
[ 21.759217][ T230] RSP: 002b:00007ffebcc8a350 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 21.759223][ T230] RAX: ffffffffffffffda RBX: 00007ffebcc8a8b0 RCX: 00000000004901eb
[ 21.759226][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 21.759229][ T230] RBP: 00007ffebcc8a390 R08: 0000000000000000 R09: 0000000000000000
[ 21.759233][ T230] R10: 000000003ad8fee0 R11: 0000000000000293 R12: 00007ffebcc8a828
[ 21.759236][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 21.759248][ T230]
[ 21.759250][ T230]
[ 21.770879][ T230] The buggy address belongs to the physical page:
[ 21.771239][ T230] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888004a78040 pfn:0x4a78
[ 21.771816][ T230] flags: 0x80000000000000(node=0|zone=1)
[ 21.772126][ T230] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 21.772636][ T230] raw: ffff888004a78040 0000000000000000 00000001ffffffff 0000000000000000
[ 21.773139][ T230] page dumped because: kasan: bad access detected
[ 21.773493][ T230]
[ 21.773638][ T230] Memory state around the buggy address:
[ 21.773913][ T230] ffff888004a78580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.774326][ T230] ffff888004a78600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.774733][ T230] >ffff888004a78680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.775147][ T230] ^
[ 21.775353][ T230] ffff888004a78700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.775759][ T230] ffff888004a78780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.776175][ T230] ==================================================================
[ 21.776835][ T230] Disabling lock debugging due to kernel taint
[ 21.777160][ T230] ------------[ cut here ]------------
[ 21.777499][ T230] refcount_t: underflow; use-after-free.
[ 21.777809][ T230] WARNING: CPU: 3 PID: 230 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 21.778295][ T230] Modules linked in:
[ 21.778533][ T230] CPU: 3 UID: 0 PID: 230 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.779182][ T230] Tainted: [B]=BAD_PAGE
[ 21.779437][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.779801][ T230] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 21.780169][ T230] 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 ab 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
[ 21.781177][ T230] RSP: 0018:ffffc90000a87ce8 EFLAGS: 00010282
[ 21.781549][ T230] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 21.781949][ T230] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 21.782344][ T230] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff573e134
[ 21.782761][ T230] R10: 0000000000000003 R11: ffffc90000a87880 R12: 0000000000000001
[ 21.783163][ T230] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 21.783535][ T230] FS: 000000003ad883c0(0000) GS:ffff88808959a000(0000) knlGS:0000000000000000
[ 21.783848][ T230] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.784072][ T230] CR2: 00007fc655df0000 CR3: 0000000005c00006 CR4: 0000000000772ef0
[ 21.784352][ T230] PKRU: 55555554
[ 21.784491][ T230] Call Trace:
[ 21.784627][ T230]
[ 21.784715][ T230] netdev_run_todo+0x5f0/0xc60
[ 21.784993][ T230] ? rtnl_is_locked+0x15/0x20
[ 21.785267][ T230] ? netif_state_change+0x228/0x2c0
[ 21.785553][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 21.785883][ T230] ? generic_xdp_install+0x410/0x410
[ 21.786148][ T230] ? tun_chr_close+0xae/0x1c0
[ 21.786443][ T230] tun_chr_close+0xc0/0x1c0
[ 21.786724][ T230] __fput+0x35c/0xa70
[ 21.786932][ T230] fput_close_sync+0xdd/0x1b0
[ 21.787154][ T230] ? alloc_file_clone+0xf0/0xf0
[ 21.787324][ T230] __x64_sys_close+0x7d/0xd0
[ 21.787498][ T230] do_syscall_64+0xc1/0xfd0
[ 21.787667][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.787891][ T230] RIP: 0033:0x4901eb
[ 21.788063][ T230] 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
[ 21.788763][ T230] RSP: 002b:00007ffebcc8a350 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 21.789182][ T230] RAX: ffffffffffffffda RBX: 00007ffebcc8a8b0 RCX: 00000000004901eb
[ 21.789495][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 21.789787][ T230] RBP: 00007ffebcc8a390 R08: 0000000000000000 R09: 0000000000000000
[ 21.790059][ T230] R10: 000000003ad8fee0 R11: 0000000000000293 R12: 00007ffebcc8a828
[ 21.790381][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 21.790667][ T230]
[ 21.790803][ T230] irq event stamp: 1787365
[ 21.790976][ T230] hardirqs last enabled at (1787365): [] irqentry_exit+0x3b/0x80
[ 21.791291][ T230] hardirqs last disabled at (1787364): [] handle_softirqs+0x47f/0x610
[ 21.791604][ T230] softirqs last enabled at (1787084): [] handle_softirqs+0x352/0x610
[ 21.791913][ T230] softirqs last disabled at (1787077): [] irq_exit_rcu+0xab/0x100
[ 21.792590][ T230] ---[ end trace 0000000000000000 ]---