[ 21.189368][ T230] ==================================================================
[ 21.189841][ T230] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 21.190178][ T230] Read of size 1 at addr ffff88800a49c68c by task packetdrill/230
[ 21.190607][ T230]
[ 21.190746][ T230] CPU: 2 UID: 0 PID: 230 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.190754][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.190757][ T230] Call Trace:
[ 21.190760][ T230]
[ 21.190764][ T230] dump_stack_lvl+0x82/0xc0
[ 21.190772][ T230] print_address_description.constprop.0+0x2c/0x3a0
[ 21.190783][ T230] ? kobject_put+0xbb/0xd0
[ 21.190790][ T230] print_report+0xb4/0x270
[ 21.190796][ T230] ? kobject_put+0xbb/0xd0
[ 21.190800][ T230] ? kasan_addr_to_slab+0x21/0x70
[ 21.190807][ T230] ? kobject_put+0xbb/0xd0
[ 21.190811][ T230] kasan_report+0xca/0x100
[ 21.190818][ T230] ? kobject_put+0xbb/0xd0
[ 21.190826][ T230] kobject_put+0xbb/0xd0
[ 21.190831][ T230] netdev_run_todo+0x5f0/0xc60
[ 21.190839][ T230] ? rtnl_is_locked+0x15/0x20
[ 21.190845][ T230] ? netif_state_change+0x228/0x2c0
[ 21.190851][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 21.190855][ T230] ? generic_xdp_install+0x410/0x410
[ 21.190863][ T230] ? tun_chr_close+0xae/0x1c0
[ 21.190874][ T230] tun_chr_close+0xc0/0x1c0
[ 21.190880][ T230] __fput+0x35c/0xa70
[ 21.190892][ T230] fput_close_sync+0xdd/0x1b0
[ 21.190897][ T230] ? alloc_file_clone+0xf0/0xf0
[ 21.190905][ T230] __x64_sys_close+0x7d/0xd0
[ 21.190910][ T230] do_syscall_64+0xc1/0xfd0
[ 21.190917][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.190923][ T230] RIP: 0033:0x4901eb
[ 21.190929][ 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
[ 21.190933][ T230] RSP: 002b:00007ffef2ff0ac0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 21.190939][ T230] RAX: ffffffffffffffda RBX: 00007ffef2ff1020 RCX: 00000000004901eb
[ 21.190942][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 21.190945][ T230] RBP: 00007ffef2ff0b00 R08: 0000000000000000 R09: 0000000000000000
[ 21.190948][ T230] R10: 0000000000040000 R11: 0000000000000293 R12: 00007ffef2ff0f98
[ 21.190951][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 21.190962][ T230]
[ 21.190964][ T230]
[ 21.201851][ T230] The buggy address belongs to the physical page:
[ 21.202108][ T230] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa49c
[ 21.202479][ T230] flags: 0x80000000000000(node=0|zone=1)
[ 21.202660][ T230] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 21.202990][ T230] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
[ 21.203295][ T230] page dumped because: kasan: bad access detected
[ 21.203589][ T230]
[ 21.203682][ T230] Memory state around the buggy address:
[ 21.203862][ T230] ffff88800a49c580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.204164][ T230] ffff88800a49c600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.204419][ T230] >ffff88800a49c680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.204671][ T230] ^
[ 21.204811][ T230] ffff88800a49c700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.205062][ T230] ffff88800a49c780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 21.205318][ T230] ==================================================================
[ 21.205813][ T230] Disabling lock debugging due to kernel taint
[ 21.206070][ T230] ------------[ cut here ]------------
[ 21.206253][ T230] refcount_t: underflow; use-after-free.
[ 21.206484][ T230] WARNING: CPU: 2 PID: 230 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 21.206836][ T230] Modules linked in:
[ 21.207004][ T230] CPU: 2 UID: 0 PID: 230 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 21.207423][ T230] Tainted: [B]=BAD_PAGE
[ 21.207577][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 21.207903][ T230] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 21.208180][ 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 45 93 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
[ 21.208819][ T230] RSP: 0018:ffffc90000af7ce8 EFLAGS: 00010282
[ 21.209076][ T230] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 21.209474][ T230] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 21.209797][ T230] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff27be134
[ 21.210105][ T230] R10: 0000000000000003 R11: ffffc90000af7880 R12: 0000000000000001
[ 21.210432][ T230] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 21.210790][ T230] FS: 00000000236fe3c0(0000) GS:ffff8880a111a000(0000) knlGS:0000000000000000
[ 21.211155][ T230] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.211422][ T230] CR2: 00007f022d657000 CR3: 0000000005fea001 CR4: 0000000000772ef0
[ 21.211786][ T230] PKRU: 55555554
[ 21.211952][ T230] Call Trace:
[ 21.212123][ T230]
[ 21.212270][ T230] netdev_run_todo+0x5f0/0xc60
[ 21.212516][ T230] ? rtnl_is_locked+0x15/0x20
[ 21.212723][ T230] ? netif_state_change+0x228/0x2c0
[ 21.212918][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 21.213193][ T230] ? generic_xdp_install+0x410/0x410
[ 21.213414][ T230] ? tun_chr_close+0xae/0x1c0
[ 21.213655][ T230] tun_chr_close+0xc0/0x1c0
[ 21.213883][ T230] __fput+0x35c/0xa70
[ 21.214064][ T230] fput_close_sync+0xdd/0x1b0
[ 21.214303][ T230] ? alloc_file_clone+0xf0/0xf0
[ 21.214576][ T230] __x64_sys_close+0x7d/0xd0
[ 21.214770][ T230] do_syscall_64+0xc1/0xfd0
[ 21.214965][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 21.215204][ T230] RIP: 0033:0x4901eb
[ 21.215374][ 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
[ 21.216007][ T230] RSP: 002b:00007ffef2ff0ac0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 21.216282][ T230] RAX: ffffffffffffffda RBX: 00007ffef2ff1020 RCX: 00000000004901eb
[ 21.216565][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 21.216842][ T230] RBP: 00007ffef2ff0b00 R08: 0000000000000000 R09: 0000000000000000
[ 21.217124][ T230] R10: 0000000000040000 R11: 0000000000000293 R12: 00007ffef2ff0f98
[ 21.217411][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 21.217695][ T230]
[ 21.217851][ T230] irq event stamp: 1392739
[ 21.218044][ T230] hardirqs last enabled at (1392739): [] irqentry_exit+0x3b/0x80
[ 21.218378][ T230] hardirqs last disabled at (1392738): [] handle_softirqs+0x47f/0x610
[ 21.218759][ T230] softirqs last enabled at (1392442): [] handle_softirqs+0x352/0x610
[ 21.219233][ T230] softirqs last disabled at (1392433): [] irq_exit_rcu+0xab/0x100
[ 21.219587][ T230] ---[ end trace 0000000000000000 ]---