[ 15.478449][ T231] ==================================================================
[ 15.478749][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 15.478960][ T231] Read of size 1 at addr ffff8880050e868c by task packetdrill/231
[ 15.479213][ T231]
[ 15.479303][ T231] CPU: 2 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.479308][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.479310][ T231] Call Trace:
[ 15.479312][ T231]
[ 15.479314][ T231] dump_stack_lvl+0x82/0xc0
[ 15.479319][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 15.479326][ T231] ? kobject_put+0xbb/0xd0
[ 15.479330][ T231] print_report+0xb4/0x270
[ 15.479333][ T231] ? kobject_put+0xbb/0xd0
[ 15.479336][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 15.479339][ T231] ? kobject_put+0xbb/0xd0
[ 15.479343][ T231] kasan_report+0xca/0x100
[ 15.479346][ T231] ? kobject_put+0xbb/0xd0
[ 15.479352][ T231] kobject_put+0xbb/0xd0
[ 15.479355][ T231] netdev_run_todo+0x5f0/0xc60
[ 15.479359][ T231] ? rtnl_is_locked+0x15/0x20
[ 15.479363][ T231] ? netif_state_change+0x228/0x2c0
[ 15.479366][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 15.479368][ T231] ? generic_xdp_install+0x410/0x410
[ 15.479373][ T231] ? tun_chr_close+0xae/0x1c0
[ 15.479379][ T231] tun_chr_close+0xc0/0x1c0
[ 15.479383][ T231] __fput+0x35c/0xa70
[ 15.479390][ T231] fput_close_sync+0xdd/0x1b0
[ 15.479393][ T231] ? alloc_file_clone+0xf0/0xf0
[ 15.479398][ T231] __x64_sys_close+0x7d/0xd0
[ 15.479401][ T231] do_syscall_64+0xc1/0xfd0
[ 15.479407][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.479411][ T231] RIP: 0033:0x4901eb
[ 15.479414][ 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
[ 15.479417][ T231] RSP: 002b:00007ffc9c5f7540 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 15.479422][ T231] RAX: ffffffffffffffda RBX: 00007ffc9c5f7aa0 RCX: 00000000004901eb
[ 15.479424][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 15.479426][ T231] RBP: 00007ffc9c5f7580 R08: 0000000000000000 R09: 0000000000000000
[ 15.479427][ T231] R10: 0000000000000010 R11: 0000000000000293 R12: 00007ffc9c5f7a18
[ 15.479429][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 15.479435][ T231]
[ 15.479437][ T231]
[ 15.486346][ T231] The buggy address belongs to the physical page:
[ 15.486555][ T231] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880050ee940 pfn:0x50e8
[ 15.486900][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 15.487077][ T231] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 15.487383][ T231] raw: ffff8880050ee940 0000000000000000 00000001ffffffff 0000000000000000
[ 15.487682][ T231] page dumped because: kasan: bad access detected
[ 15.487892][ T231]
[ 15.487976][ T231] Memory state around the buggy address:
[ 15.488142][ T231] ffff8880050e8580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.488418][ T231] ffff8880050e8600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.488678][ T231] >ffff8880050e8680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.488929][ T231] ^
[ 15.489058][ T231] ffff8880050e8700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.489306][ T231] ffff8880050e8780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.489546][ T231] ==================================================================
[ 15.489850][ T231] Disabling lock debugging due to kernel taint
[ 15.490082][ T231] ------------[ cut here ]------------
[ 15.490285][ T231] refcount_t: underflow; use-after-free.
[ 15.490489][ T231] WARNING: CPU: 2 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 15.490819][ T231] Modules linked in:
[ 15.490974][ T231] CPU: 2 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.491393][ T231] Tainted: [B]=BAD_PAGE
[ 15.491542][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.491780][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 15.492024][ 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 65 8b 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
[ 15.492647][ T231] RSP: 0018:ffffc90000b17ce8 EFLAGS: 00010282
[ 15.492978][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 15.493264][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 15.493536][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff17fe134
[ 15.493900][ T231] R10: 0000000000000003 R11: ffffc90000b17880 R12: 0000000000000001
[ 15.494183][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 15.494542][ T231] FS: 00000000075103c0(0000) GS:ffff8880a8f1a000(0000) knlGS:0000000000000000
[ 15.494862][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 15.495103][ T231] CR2: 00007f2a3e72d000 CR3: 000000000c6b1005 CR4: 0000000000772ef0
[ 15.495478][ T231] PKRU: 55555554
[ 15.495625][ T231] Call Trace:
[ 15.495779][ T231]
[ 15.495892][ T231] netdev_run_todo+0x5f0/0xc60
[ 15.496083][ T231] ? rtnl_is_locked+0x15/0x20
[ 15.496375][ T231] ? netif_state_change+0x228/0x2c0
[ 15.496562][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 15.496790][ T231] ? generic_xdp_install+0x410/0x410
[ 15.496982][ T231] ? tun_chr_close+0xae/0x1c0
[ 15.497274][ T231] tun_chr_close+0xc0/0x1c0
[ 15.497459][ T231] __fput+0x35c/0xa70
[ 15.497610][ T231] fput_close_sync+0xdd/0x1b0
[ 15.497802][ T231] ? alloc_file_clone+0xf0/0xf0
[ 15.498079][ T231] __x64_sys_close+0x7d/0xd0
[ 15.498285][ T231] do_syscall_64+0xc1/0xfd0
[ 15.498473][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.498709][ T231] RIP: 0033:0x4901eb
[ 15.498959][ 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
[ 15.499675][ T231] RSP: 002b:00007ffc9c5f7540 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 15.499956][ T231] RAX: ffffffffffffffda RBX: 00007ffc9c5f7aa0 RCX: 00000000004901eb
[ 15.500245][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 15.500608][ T231] RBP: 00007ffc9c5f7580 R08: 0000000000000000 R09: 0000000000000000
[ 15.500887][ T231] R10: 0000000000000010 R11: 0000000000000293 R12: 00007ffc9c5f7a18
[ 15.501164][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 15.501528][ T231]
[ 15.501674][ T231] irq event stamp: 2108387
[ 15.501876][ T231] hardirqs last enabled at (2108387): [] irqentry_exit+0x3b/0x80
[ 15.502286][ T231] hardirqs last disabled at (2108386): [] handle_softirqs+0x47f/0x610
[ 15.502596][ T231] softirqs last enabled at (2108198): [] __tun_set_ebpf+0xc6/0x180
[ 15.502996][ T231] softirqs last disabled at (2108196): [] __tun_set_ebpf+0x91/0x180
[ 15.503322][ T231] ---[ end trace 0000000000000000 ]---