[ 20.459010][ T232] ==================================================================
[ 20.459350][ T232] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 20.459590][ T232] Read of size 1 at addr ffff88800a7fc68c by task packetdrill/232
[ 20.459884][ T232]
[ 20.459976][ T232] CPU: 3 UID: 0 PID: 232 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.459984][ T232] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.459992][ T232] Call Trace:
[ 20.459997][ T232]
[ 20.460000][ T232] dump_stack_lvl+0x82/0xc0
[ 20.460011][ T232] print_address_description.constprop.0+0x2c/0x3a0
[ 20.460023][ T232] ? kobject_put+0xbb/0xd0
[ 20.460027][ T232] print_report+0xb4/0x270
[ 20.460031][ T232] ? kobject_put+0xbb/0xd0
[ 20.460034][ T232] ? kasan_addr_to_slab+0x21/0x70
[ 20.460037][ T232] ? kobject_put+0xbb/0xd0
[ 20.460040][ T232] kasan_report+0xca/0x100
[ 20.460044][ T232] ? kobject_put+0xbb/0xd0
[ 20.460050][ T232] kobject_put+0xbb/0xd0
[ 20.460053][ T232] netdev_run_todo+0x5f0/0xc60
[ 20.460062][ T232] ? rtnl_is_locked+0x15/0x20
[ 20.460066][ T232] ? netif_state_change+0x228/0x2c0
[ 20.460069][ T232] ? call_netdevice_notifiers_info+0x100/0x100
[ 20.460072][ T232] ? generic_xdp_install+0x410/0x410
[ 20.460077][ T232] ? tun_chr_close+0xae/0x1c0
[ 20.460087][ T232] tun_chr_close+0xc0/0x1c0
[ 20.460091][ T232] __fput+0x35c/0xa70
[ 20.460099][ T232] fput_close_sync+0xdd/0x1b0
[ 20.460103][ T232] ? alloc_file_clone+0xf0/0xf0
[ 20.460107][ T232] __x64_sys_close+0x7d/0xd0
[ 20.460111][ T232] do_syscall_64+0xc1/0xfd0
[ 20.460119][ T232] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.460125][ T232] RIP: 0033:0x4901eb
[ 20.460132][ T232] 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
[ 20.460135][ T232] RSP: 002b:00007ffec3404a80 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 20.460142][ T232] RAX: ffffffffffffffda RBX: 00007ffec3404fe0 RCX: 00000000004901eb
[ 20.460145][ T232] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 20.460146][ T232] RBP: 00007ffec3404ac0 R08: 0000000000000000 R09: 0000000000000000
[ 20.460148][ T232] R10: 000000001c541520 R11: 0000000000000293 R12: 00007ffec3404f58
[ 20.460150][ T232] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 20.460156][ T232]
[ 20.460157][ T232]
[ 20.467920][ T232] The buggy address belongs to the physical page:
[ 20.468154][ T232] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800a7ffd00 pfn:0xa7fc
[ 20.468503][ T232] flags: 0x80000000000000(node=0|zone=1)
[ 20.468699][ T232] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 20.469035][ T232] raw: ffff88800a7ffd00 0000000000000000 00000001ffffffff 0000000000000000
[ 20.469381][ T232] page dumped because: kasan: bad access detected
[ 20.469598][ T232]
[ 20.469691][ T232] Memory state around the buggy address:
[ 20.469871][ T232] ffff88800a7fc580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.470141][ T232] ffff88800a7fc600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.470391][ T232] >ffff88800a7fc680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.470661][ T232] ^
[ 20.470790][ T232] ffff88800a7fc700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.471043][ T232] ffff88800a7fc780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.471286][ T232] ==================================================================
[ 20.471570][ T232] Disabling lock debugging due to kernel taint
[ 20.471783][ T232] ------------[ cut here ]------------
[ 20.471958][ T232] refcount_t: underflow; use-after-free.
[ 20.472183][ T232] WARNING: CPU: 3 PID: 232 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 20.472510][ T232] Modules linked in:
[ 20.472668][ T232] CPU: 3 UID: 0 PID: 232 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.473058][ T232] Tainted: [B]=BAD_PAGE
[ 20.473199][ T232] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.473431][ T232] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 20.473688][ T232] 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 b1 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
[ 20.474374][ T232] RSP: 0018:ffffc90000b87ce8 EFLAGS: 00010282
[ 20.474608][ T232] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 20.474892][ T232] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 20.475173][ T232] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff643e134
[ 20.475445][ T232] R10: 0000000000000003 R11: ffffc90000b87880 R12: 0000000000000001
[ 20.475735][ T232] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 20.476031][ T232] FS: 000000001c5393c0(0000) GS:ffff888082d9a000(0000) knlGS:0000000000000000
[ 20.476356][ T232] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 20.476582][ T232] CR2: 00007f894866b000 CR3: 000000000906e005 CR4: 0000000000772ef0
[ 20.476841][ T232] PKRU: 55555554
[ 20.476988][ T232] Call Trace:
[ 20.477118][ T232]
[ 20.477212][ T232] netdev_run_todo+0x5f0/0xc60
[ 20.477394][ T232] ? rtnl_is_locked+0x15/0x20
[ 20.477618][ T232] ? netif_state_change+0x228/0x2c0
[ 20.477797][ T232] ? call_netdevice_notifiers_info+0x100/0x100
[ 20.478024][ T232] ? generic_xdp_install+0x410/0x410
[ 20.478193][ T232] ? tun_chr_close+0xae/0x1c0
[ 20.478367][ T232] tun_chr_close+0xc0/0x1c0
[ 20.478560][ T232] __fput+0x35c/0xa70
[ 20.478710][ T232] fput_close_sync+0xdd/0x1b0
[ 20.478897][ T232] ? alloc_file_clone+0xf0/0xf0
[ 20.479070][ T232] __x64_sys_close+0x7d/0xd0
[ 20.479238][ T232] do_syscall_64+0xc1/0xfd0
[ 20.479433][ T232] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.479677][ T232] RIP: 0033:0x4901eb
[ 20.479821][ T232] 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
[ 20.480438][ T232] RSP: 002b:00007ffec3404a80 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 20.480736][ T232] RAX: ffffffffffffffda RBX: 00007ffec3404fe0 RCX: 00000000004901eb
[ 20.481003][ T232] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 20.481274][ T232] RBP: 00007ffec3404ac0 R08: 0000000000000000 R09: 0000000000000000
[ 20.481547][ T232] R10: 000000001c541520 R11: 0000000000000293 R12: 00007ffec3404f58
[ 20.481827][ T232] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 20.482154][ T232]
[ 20.482279][ T232] irq event stamp: 1742409
[ 20.482449][ T232] hardirqs last enabled at (1742409): [] irqentry_exit+0x3b/0x80
[ 20.482760][ T232] hardirqs last disabled at (1742408): [] handle_softirqs+0x47f/0x610
[ 20.483074][ T232] softirqs last enabled at (1742218): [] __tun_set_ebpf+0xc6/0x180
[ 20.483376][ T232] softirqs last disabled at (1742216): [] __tun_set_ebpf+0x91/0x180
[ 20.483677][ T232] ---[ end trace 0000000000000000 ]---