[ 15.698091][ T238] ==================================================================
[ 15.698407][ T238] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 15.698630][ T238] Read of size 1 at addr ffff88800be1068c by task packetdrill/238
[ 15.698880][ T238]
[ 15.698964][ T238] CPU: 1 UID: 0 PID: 238 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.698969][ T238] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.698971][ T238] Call Trace:
[ 15.698973][ T238]
[ 15.698975][ T238] dump_stack_lvl+0x82/0xc0
[ 15.698980][ T238] print_address_description.constprop.0+0x2c/0x3a0
[ 15.698987][ T238] ? kobject_put+0xbb/0xd0
[ 15.698991][ T238] print_report+0xb4/0x270
[ 15.698994][ T238] ? kobject_put+0xbb/0xd0
[ 15.698997][ T238] ? kasan_addr_to_slab+0x21/0x70
[ 15.699001][ T238] ? kobject_put+0xbb/0xd0
[ 15.699004][ T238] kasan_report+0xca/0x100
[ 15.699008][ T238] ? kobject_put+0xbb/0xd0
[ 15.699013][ T238] kobject_put+0xbb/0xd0
[ 15.699016][ T238] netdev_run_todo+0x5f0/0xc60
[ 15.699021][ T238] ? rtnl_is_locked+0x15/0x20
[ 15.699025][ T238] ? generic_xdp_install+0x410/0x410
[ 15.699029][ T238] ? kfree+0x21d/0x540
[ 15.699036][ T238] tun_chr_close+0xc0/0x1c0
[ 15.699041][ T238] __fput+0x35c/0xa70
[ 15.699048][ T238] task_work_run+0x12e/0x210
[ 15.699054][ T238] ? task_work_cancel+0x30/0x30
[ 15.699057][ T238] ? kmem_cache_free+0x22b/0x4b0
[ 15.699060][ T238] ? refcount_dec_and_lock+0x17/0x80
[ 15.699065][ T238] ? do_exit+0x5a2/0xeb0
[ 15.699070][ T238] do_exit+0x5a7/0xeb0
[ 15.699073][ T238] ? stack_not_used+0x80/0x80
[ 15.699075][ T238] ? find_held_lock+0x2b/0x80
[ 15.699079][ T238] ? get_signal+0x6c0/0x1b30
[ 15.699083][ T238] ? __lock_release+0x5d/0x170
[ 15.699087][ T238] do_group_exit+0xb8/0x260
[ 15.699091][ T238] get_signal+0x1970/0x1b30
[ 15.699096][ T238] ? ptrace_signal+0x670/0x670
[ 15.699100][ T238] ? do_futex+0x1b0/0x240
[ 15.699106][ T238] arch_do_signal_or_restart+0x7a/0x2f0
[ 15.699113][ T238] ? get_sigframe_size+0x20/0x20
[ 15.699116][ T238] ? __x64_sys_futex+0x177/0x440
[ 15.699120][ T238] ? find_held_lock+0x2b/0x80
[ 15.699122][ T238] ? do_futex+0x240/0x240
[ 15.699125][ T238] ? __task_pid_nr_ns+0x281/0x410
[ 15.699128][ T238] ? __lock_release+0x5d/0x170
[ 15.699132][ T238] ? rcu_is_watching+0x12/0xb0
[ 15.699138][ T238] exit_to_user_mode_loop+0x82/0xd0
[ 15.699144][ T238] do_syscall_64+0x2ee/0xfd0
[ 15.699148][ T238] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.699152][ T238] RIP: 0033:0x4d7f9a
[ 15.699155][ T238] Code: Unable to access opcode bytes at 0x4d7f70.
[ 15.699157][ T238] RSP: 002b:00007fc6beac6090 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
[ 15.699160][ T238] RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00000000004d7f9a
[ 15.699162][ T238] RDX: 0000000000000000 RSI: 0000000000000189 RDI: 000000000ce3dca0
[ 15.699164][ T238] RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000ffffffff
[ 15.699166][ T238] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[ 15.699167][ T238] R13: 000000000ce3dca0 R14: 00007fc6beac60f0 R15: 0000000000000000
[ 15.699173][ T238]
[ 15.699174][ T238]
[ 15.708350][ T238] The buggy address belongs to the physical page:
[ 15.708560][ T238] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800be13bc0 pfn:0xbe10
[ 15.708891][ T238] flags: 0x80000000000000(node=0|zone=1)
[ 15.709067][ T238] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000
[ 15.709366][ T238] raw: ffff88800be13bc0 0000000000000000 00000001ffffffff 0000000000000000
[ 15.709666][ T238] page dumped because: kasan: bad access detected
[ 15.709869][ T238]
[ 15.709950][ T238] Memory state around the buggy address:
[ 15.710109][ T238] ffff88800be10580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.710347][ T238] ffff88800be10600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.710595][ T238] >ffff88800be10680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.710854][ T238] ^
[ 15.710982][ T238] ffff88800be10700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.711231][ T238] ffff88800be10780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 15.711493][ T238] ==================================================================
[ 15.711751][ T238] Disabling lock debugging due to kernel taint
[ 15.711964][ T238] ------------[ cut here ]------------
[ 15.712116][ T238] refcount_t: underflow; use-after-free.
[ 15.712299][ T238] WARNING: CPU: 1 PID: 238 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 15.712587][ T238] Modules linked in:
[ 15.712720][ T238] CPU: 1 UID: 0 PID: 238 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 15.713098][ T238] Tainted: [B]=BAD_PAGE
[ 15.713234][ T238] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.713458][ T238] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 15.713670][ T238] 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 05 8e 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
[ 15.714273][ T238] RSP: 0018:ffffc90000b179f0 EFLAGS: 00010286
[ 15.714490][ T238] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 15.714730][ T238] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 15.714982][ T238] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff1d3e134
[ 15.715238][ T238] R10: 0000000000000003 R11: ffffc90000b17580 R12: 0000000000000001
[ 15.715496][ T238] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 15.715747][ T238] FS: 0000000000000000(0000) GS:ffff8880a649a000(0000) knlGS:0000000000000000
[ 15.716030][ T238] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 15.716232][ T238] CR2: 00007f8ac8552a20 CR3: 0000000025b35006 CR4: 0000000000772ef0
[ 15.716470][ T238] PKRU: 55555554
[ 15.716605][ T238] Call Trace:
[ 15.716737][ T238]
[ 15.716827][ T238] netdev_run_todo+0x5f0/0xc60
[ 15.716996][ T238] ? rtnl_is_locked+0x15/0x20
[ 15.717172][ T238] ? generic_xdp_install+0x410/0x410
[ 15.717331][ T238] ? kfree+0x21d/0x540
[ 15.717473][ T238] tun_chr_close+0xc0/0x1c0
[ 15.717639][ T238] __fput+0x35c/0xa70
[ 15.717772][ T238] task_work_run+0x12e/0x210
[ 15.717943][ T238] ? task_work_cancel+0x30/0x30
[ 15.718199][ T238] ? kmem_cache_free+0x22b/0x4b0
[ 15.718370][ T238] ? refcount_dec_and_lock+0x17/0x80
[ 15.718536][ T238] ? do_exit+0x5a2/0xeb0
[ 15.718657][ T238] do_exit+0x5a7/0xeb0
[ 15.718789][ T238] ? stack_not_used+0x80/0x80
[ 15.718960][ T238] ? find_held_lock+0x2b/0x80
[ 15.719122][ T238] ? get_signal+0x6c0/0x1b30
[ 15.719279][ T238] ? __lock_release+0x5d/0x170
[ 15.719439][ T238] do_group_exit+0xb8/0x260
[ 15.719706][ T238] get_signal+0x1970/0x1b30
[ 15.719875][ T238] ? ptrace_signal+0x670/0x670
[ 15.720031][ T238] ? do_futex+0x1b0/0x240
[ 15.720154][ T238] arch_do_signal_or_restart+0x7a/0x2f0
[ 15.720413][ T238] ? get_sigframe_size+0x20/0x20
[ 15.720574][ T238] ? __x64_sys_futex+0x177/0x440
[ 15.720732][ T238] ? find_held_lock+0x2b/0x80
[ 15.720896][ T238] ? do_futex+0x240/0x240
[ 15.721114][ T238] ? __task_pid_nr_ns+0x281/0x410
[ 15.721271][ T238] ? __lock_release+0x5d/0x170
[ 15.721427][ T238] ? rcu_is_watching+0x12/0xb0
[ 15.721588][ T238] exit_to_user_mode_loop+0x82/0xd0
[ 15.721853][ T238] do_syscall_64+0x2ee/0xfd0
[ 15.722016][ T238] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 15.722210][ T238] RIP: 0033:0x4d7f9a
[ 15.722342][ T238] Code: Unable to access opcode bytes at 0x4d7f70.
[ 15.722644][ T238] RSP: 002b:00007fc6beac6090 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
[ 15.722913][ T238] RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00000000004d7f9a
[ 15.723154][ T238] RDX: 0000000000000000 RSI: 0000000000000189 RDI: 000000000ce3dca0
[ 15.723485][ T238] RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000ffffffff
[ 15.723733][ T238] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[ 15.724072][ T238] R13: 000000000ce3dca0 R14: 00007fc6beac60f0 R15: 0000000000000000
[ 15.724320][ T238]
[ 15.724439][ T238] irq event stamp: 12511
[ 15.724564][ T238] hardirqs last enabled at (12511): [] irqentry_exit+0x3b/0x80
[ 15.724938][ T238] hardirqs last disabled at (12510): [] sysvec_apic_timer_interrupt+0xf/0xc0
[ 15.725249][ T238] softirqs last enabled at (12328): [] __tun_set_ebpf+0xc6/0x180
[ 15.725636][ T238] softirqs last disabled at (12326): [] __tun_set_ebpf+0x91/0x180
[ 15.725917][ T238] ---[ end trace 0000000000000000 ]---