[ 20.656976][ T231] ==================================================================
[ 20.657353][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 20.657623][ T231] Read of size 1 at addr ffff88800528868c by task packetdrill/231
[ 20.657914][ T231]
[ 20.658053][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.658059][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.658065][ T231] Call Trace:
[ 20.658068][ T231]
[ 20.658070][ T231] dump_stack_lvl+0x82/0xc0
[ 20.658077][ T231] print_address_description.constprop.0+0x2c/0x3a0
[ 20.658085][ T231] ? kobject_put+0xbb/0xd0
[ 20.658089][ T231] print_report+0xb4/0x270
[ 20.658093][ T231] ? kobject_put+0xbb/0xd0
[ 20.658096][ T231] ? kasan_addr_to_slab+0x21/0x70
[ 20.658100][ T231] ? kobject_put+0xbb/0xd0
[ 20.658103][ T231] kasan_report+0xca/0x100
[ 20.658107][ T231] ? kobject_put+0xbb/0xd0
[ 20.658112][ T231] kobject_put+0xbb/0xd0
[ 20.658116][ T231] netdev_run_todo+0x5f0/0xc60
[ 20.658122][ T231] ? rtnl_is_locked+0x15/0x20
[ 20.658126][ T231] ? netif_state_change+0x228/0x2c0
[ 20.658129][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 20.658132][ T231] ? generic_xdp_install+0x410/0x410
[ 20.658136][ T231] ? tun_chr_close+0xae/0x1c0
[ 20.658143][ T231] tun_chr_close+0xc0/0x1c0
[ 20.658147][ T231] __fput+0x35c/0xa70
[ 20.658156][ T231] fput_close_sync+0xdd/0x1b0
[ 20.658159][ T231] ? alloc_file_clone+0xf0/0xf0
[ 20.658163][ T231] __x64_sys_close+0x7d/0xd0
[ 20.658167][ T231] do_syscall_64+0xc1/0xfd0
[ 20.658175][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.658180][ T231] RIP: 0033:0x4901eb
[ 20.658185][ 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
[ 20.658188][ T231] RSP: 002b:00007ffc0ae2f4e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 20.658194][ T231] RAX: ffffffffffffffda RBX: 00007ffc0ae2fa40 RCX: 00000000004901eb
[ 20.658197][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 20.658198][ T231] RBP: 00007ffc0ae2f520 R08: 0000000000000000 R09: 0000000000000000
[ 20.658200][ T231] R10: 0000000000000002 R11: 0000000000000293 R12: 00007ffc0ae2f9b8
[ 20.658202][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 20.658208][ T231]
[ 20.658210][ T231]
[ 20.667371][ T231] The buggy address belongs to the physical page:
[ 20.667726][ T231] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88800528c000 pfn:0x5288
[ 20.668309][ T231] flags: 0x80000000000000(node=0|zone=1)
[ 20.668625][ T231] raw: 0080000000000000 ffffea000022c808 ffff88803623bc40 0000000000000000
[ 20.669154][ T231] raw: ffff88800528c000 0000000000000000 00000000ffffffff 0000000000000000
[ 20.669667][ T231] page dumped because: kasan: bad access detected
[ 20.670013][ T231]
[ 20.670157][ T231] Memory state around the buggy address:
[ 20.670447][ T231] ffff888005288580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.670870][ T231] ffff888005288600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.671303][ T231] >ffff888005288680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.671729][ T231] ^
[ 20.671944][ T231] ffff888005288700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.672363][ T231] ffff888005288780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.672779][ T231] ==================================================================
[ 20.673293][ T231] Disabling lock debugging due to kernel taint
[ 20.673664][ T231] ------------[ cut here ]------------
[ 20.673930][ T231] refcount_t: underflow; use-after-free.
[ 20.674516][ T231] WARNING: CPU: 0 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 20.675036][ T231] Modules linked in:
[ 20.675268][ T231] CPU: 0 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.675726][ T231] Tainted: [B]=BAD_PAGE
[ 20.675875][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.676108][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 20.676361][ 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 85 9c 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
[ 20.677033][ T231] RSP: 0018:ffffc90000ae7ce8 EFLAGS: 00010282
[ 20.677296][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 20.677644][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 20.678038][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3a3e134
[ 20.678327][ T231] R10: 0000000000000003 R11: ffffc90000ae7880 R12: 0000000000000001
[ 20.678607][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 20.678889][ T231] FS: 0000000012e733c0(0000) GS:ffff888097c1a000(0000) knlGS:0000000000000000
[ 20.679212][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 20.679472][ T231] CR2: 00007fe20cde4000 CR3: 00000000050b3005 CR4: 0000000000772ef0
[ 20.679752][ T231] PKRU: 55555554
[ 20.679894][ T231] Call Trace:
[ 20.680043][ T231]
[ 20.680138][ T231] netdev_run_todo+0x5f0/0xc60
[ 20.680340][ T231] ? rtnl_is_locked+0x15/0x20
[ 20.680580][ T231] ? netif_state_change+0x228/0x2c0
[ 20.680863][ T231] ? call_netdevice_notifiers_info+0x100/0x100
[ 20.681218][ T231] ? generic_xdp_install+0x410/0x410
[ 20.681512][ T231] ? tun_chr_close+0xae/0x1c0
[ 20.681803][ T231] tun_chr_close+0xc0/0x1c0
[ 20.682089][ T231] __fput+0x35c/0xa70
[ 20.682318][ T231] fput_close_sync+0xdd/0x1b0
[ 20.682614][ T231] ? alloc_file_clone+0xf0/0xf0
[ 20.682897][ T231] __x64_sys_close+0x7d/0xd0
[ 20.683180][ T231] do_syscall_64+0xc1/0xfd0
[ 20.683476][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.683828][ T231] RIP: 0033:0x4901eb
[ 20.684060][ 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
[ 20.685079][ T231] RSP: 002b:00007ffc0ae2f4e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 20.685509][ T231] RAX: ffffffffffffffda RBX: 00007ffc0ae2fa40 RCX: 00000000004901eb
[ 20.685918][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 20.686197][ T231] RBP: 00007ffc0ae2f520 R08: 0000000000000000 R09: 0000000000000000
[ 20.686483][ T231] R10: 0000000000000002 R11: 0000000000000293 R12: 00007ffc0ae2f9b8
[ 20.686761][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 20.687047][ T231]
[ 20.687214][ T231] irq event stamp: 1160219
[ 20.687432][ T231] hardirqs last enabled at (1160219): [] irqentry_exit+0x3b/0x80
[ 20.687772][ T231] hardirqs last disabled at (1160218): [] handle_softirqs+0x47f/0x610
[ 20.688105][ T231] softirqs last enabled at (1160020): [] __tun_set_ebpf+0xc6/0x180
[ 20.688433][ T231] softirqs last disabled at (1160018): [] __tun_set_ebpf+0x91/0x180
[ 20.688764][ T231] ---[ end trace 0000000000000000 ]---