[ 18.967356][ T239] ==================================================================
[ 18.967920][ T239] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 18.968322][ T239] Read of size 1 at addr ffff88800c40068c by task packetdrill/239
[ 18.968761][ T239]
[ 18.968925][ T239] CPU: 2 UID: 0 PID: 239 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 18.968933][ T239] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.968937][ T239] Call Trace:
[ 18.968941][ T239]
[ 18.968944][ T239] dump_stack_lvl+0x82/0xc0
[ 18.968954][ T239] print_address_description.constprop.0+0x2c/0x3a0
[ 18.968974][ T239] ? kobject_put+0xbb/0xd0
[ 18.968981][ T239] print_report+0xb4/0x270
[ 18.968986][ T239] ? kobject_put+0xbb/0xd0
[ 18.968990][ T239] ? kasan_addr_to_slab+0x21/0x70
[ 18.968995][ T239] ? kobject_put+0xbb/0xd0
[ 18.968999][ T239] kasan_report+0xca/0x100
[ 18.969005][ T239] ? kobject_put+0xbb/0xd0
[ 18.969013][ T239] kobject_put+0xbb/0xd0
[ 18.969018][ T239] netdev_run_todo+0x5f0/0xc60
[ 18.969030][ T239] ? rtnl_is_locked+0x15/0x20
[ 18.969039][ T239] ? generic_xdp_install+0x410/0x410
[ 18.969046][ T239] ? kfree+0x21d/0x540
[ 18.969057][ T239] tun_chr_close+0xc0/0x1c0
[ 18.969067][ T239] __fput+0x35c/0xa70
[ 18.969082][ T239] task_work_run+0x12e/0x210
[ 18.969097][ T239] ? task_work_cancel+0x30/0x30
[ 18.969103][ T239] ? kmem_cache_free+0x22b/0x4b0
[ 18.969108][ T239] ? refcount_dec_and_lock+0x17/0x80
[ 18.969116][ T239] ? do_exit+0x5a2/0xeb0
[ 18.969126][ T239] do_exit+0x5a7/0xeb0
[ 18.969130][ T239] ? stack_not_used+0x80/0x80
[ 18.969134][ T239] ? find_held_lock+0x2b/0x80
[ 18.969141][ T239] ? get_signal+0x6c0/0x1b30
[ 18.969148][ T239] ? __lock_release+0x5d/0x170
[ 18.969154][ T239] do_group_exit+0xb8/0x260
[ 18.969159][ T239] get_signal+0x1970/0x1b30
[ 18.969169][ T239] ? ptrace_signal+0x670/0x670
[ 18.969175][ T239] ? do_futex+0x1b0/0x240
[ 18.969188][ T239] arch_do_signal_or_restart+0x7a/0x2f0
[ 18.969199][ T239] ? get_sigframe_size+0x20/0x20
[ 18.969205][ T239] ? __x64_sys_futex+0x177/0x440
[ 18.969212][ T239] ? find_held_lock+0x2b/0x80
[ 18.969217][ T239] ? do_futex+0x240/0x240
[ 18.969222][ T239] ? __task_pid_nr_ns+0x281/0x410
[ 18.969226][ T239] ? __lock_release+0x5d/0x170
[ 18.969232][ T239] ? rcu_is_watching+0x12/0xb0
[ 18.969241][ T239] exit_to_user_mode_loop+0x82/0xd0
[ 18.969250][ T239] do_syscall_64+0x2ee/0xfd0
[ 18.969259][ T239] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 18.969265][ T239] RIP: 0033:0x4d7f9a
[ 18.969271][ T239] Code: Unable to access opcode bytes at 0x4d7f70.
[ 18.969274][ T239] RSP: 002b:00007fa79235a090 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
[ 18.969281][ T239] RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00000000004d7f9a
[ 18.969285][ T239] RDX: 0000000000000000 RSI: 0000000000000189 RDI: 0000000026e3b690
[ 18.969288][ T239] RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000ffffffff
[ 18.969290][ T239] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[ 18.969293][ T239] R13: 0000000026e3b690 R14: 00007fa79235a0f0 R15: 0000000000000000
[ 18.969305][ T239]
[ 18.969308][ T239]
[ 18.985715][ T239] The buggy address belongs to the physical page:
[ 18.986087][ T239] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800c401000 pfn:0xc400
[ 18.986699][ T239] flags: 0x80000000000000(node=0|zone=1)
[ 18.987012][ T239] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 18.987560][ T239] raw: ffff88800c401000 0000000000000000 00000001ffffffff 0000000000000000
[ 18.988105][ T239] page dumped because: kasan: bad access detected
[ 18.988482][ T239]
[ 18.988632][ T239] Memory state around the buggy address:
[ 18.988916][ T239] ffff88800c400580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.989347][ T239] ffff88800c400600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.989778][ T239] >ffff88800c400680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.990225][ T239] ^
[ 18.990450][ T239] ffff88800c400700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.990827][ T239] ffff88800c400780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 18.991255][ T239] ==================================================================
[ 18.991781][ T239] Disabling lock debugging due to kernel taint
[ 18.992190][ T239] ------------[ cut here ]------------
[ 18.992505][ T239] refcount_t: underflow; use-after-free.
[ 18.992829][ T239] WARNING: CPU: 2 PID: 239 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 18.993401][ T239] Modules linked in:
[ 18.993657][ T239] CPU: 2 UID: 0 PID: 239 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 18.994335][ T239] Tainted: [B]=BAD_PAGE
[ 18.994591][ T239] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 18.994991][ T239] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 18.995408][ T239] 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 a5 9f 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
[ 18.996473][ T239] RSP: 0018:ffffc90000ac79f0 EFLAGS: 00010286
[ 18.996870][ T239] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 18.997317][ T239] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 18.997764][ T239] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff407e134
[ 18.998235][ T239] R10: 0000000000000003 R11: ffffc90000ac7580 R12: 0000000000000001
[ 18.998707][ T239] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 18.999193][ T239] FS: 0000000000000000(0000) GS:ffff888094b1a000(0000) knlGS:0000000000000000
[ 18.999724][ T239] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 19.000111][ T239] CR2: 00007f09f5cfd000 CR3: 0000000030b35002 CR4: 0000000000772ef0
[ 19.000562][ T239] PKRU: 55555554
[ 19.000808][ T239] Call Trace:
[ 19.001064][ T239]
[ 19.001244][ T239] netdev_run_todo+0x5f0/0xc60
[ 19.001575][ T239] ? rtnl_is_locked+0x15/0x20
[ 19.001883][ T239] ? generic_xdp_install+0x410/0x410
[ 19.002197][ T239] ? kfree+0x21d/0x540
[ 19.002446][ T239] tun_chr_close+0xc0/0x1c0
[ 19.002758][ T239] __fput+0x35c/0xa70
[ 19.003012][ T239] task_work_run+0x12e/0x210
[ 19.003349][ T239] ? task_work_cancel+0x30/0x30
[ 19.003667][ T239] ? kmem_cache_free+0x22b/0x4b0
[ 19.003988][ T239] ? refcount_dec_and_lock+0x17/0x80
[ 19.004317][ T239] ? do_exit+0x5a2/0xeb0
[ 19.004564][ T239] do_exit+0x5a7/0xeb0
[ 19.004793][ T239] ? stack_not_used+0x80/0x80
[ 19.005110][ T239] ? find_held_lock+0x2b/0x80
[ 19.005423][ T239] ? get_signal+0x6c0/0x1b30
[ 19.005742][ T239] ? __lock_release+0x5d/0x170
[ 19.006068][ T239] do_group_exit+0xb8/0x260
[ 19.006400][ T239] get_signal+0x1970/0x1b30
[ 19.006711][ T239] ? ptrace_signal+0x670/0x670
[ 19.007031][ T239] ? do_futex+0x1b0/0x240
[ 19.007286][ T239] arch_do_signal_or_restart+0x7a/0x2f0
[ 19.007606][ T239] ? get_sigframe_size+0x20/0x20
[ 19.007917][ T239] ? __x64_sys_futex+0x177/0x440
[ 19.008242][ T239] ? find_held_lock+0x2b/0x80
[ 19.008545][ T239] ? do_futex+0x240/0x240
[ 19.008802][ T239] ? __task_pid_nr_ns+0x281/0x410
[ 19.009119][ T239] ? __lock_release+0x5d/0x170
[ 19.009411][ T239] ? rcu_is_watching+0x12/0xb0
[ 19.009734][ T239] exit_to_user_mode_loop+0x82/0xd0
[ 19.010045][ T239] do_syscall_64+0x2ee/0xfd0
[ 19.010378][ T239] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 19.010746][ T239] RIP: 0033:0x4d7f9a
[ 19.010925][ T239] Code: Unable to access opcode bytes at 0x4d7f70.
[ 19.011340][ T239] RSP: 002b:00007fa79235a090 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
[ 19.011807][ T239] RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00000000004d7f9a
[ 19.012240][ T239] RDX: 0000000000000000 RSI: 0000000000000189 RDI: 0000000026e3b690
[ 19.012709][ T239] RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000ffffffff
[ 19.013163][ T239] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[ 19.013640][ T239] R13: 0000000026e3b690 R14: 00007fa79235a0f0 R15: 0000000000000000
[ 19.014123][ T239]
[ 19.014381][ T239] irq event stamp: 13671
[ 19.014609][ T239] hardirqs last enabled at (13671): [] irqentry_exit+0x3b/0x80
[ 19.015178][ T239] hardirqs last disabled at (13670): [] handle_softirqs+0x47f/0x610
[ 19.015709][ T239] softirqs last enabled at (13482): [] __tun_set_ebpf+0xc6/0x180
[ 19.016262][ T239] softirqs last disabled at (13480): [] __tun_set_ebpf+0x91/0x180
[ 19.016781][ T239] ---[ end trace 0000000000000000 ]---