==================================================================
BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3157 [inline]
BUG: KASAN: double-free or invalid-free in kfree+0xe5/0x5c0 mm/slub.c:4196

CPU: 0 PID: 16842 Comm: syz-executor.1 Not tainted 5.11.0-rc2-next-20210107-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230
 kasan_report_invalid_free+0x51/0x80 mm/kasan/report.c:355
 ____kasan_slab_free.part.0+0xfd/0x110 mm/kasan/common.c:344
 kasan_slab_free include/linux/kasan.h:188 [inline]
 slab_free_hook mm/slub.c:1548 [inline]
 slab_free_freelist_hook+0x82/0x1d0 mm/slub.c:1586
 slab_free mm/slub.c:3157 [inline]
 kfree+0xe5/0x5c0 mm/slub.c:4196
 bdev_free_inode+0x57/0x80 fs/block_dev.c:787
 i_callback+0x3f/0x70 fs/inode.c:223
 rcu_do_batch kernel/rcu/tree.c:2508 [inline]
 rcu_core+0x72b/0x1290 kernel/rcu/tree.c:2743
 __do_softirq+0x2a5/0x9f7 kernel/softirq.c:343
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:226 [inline]
 __irq_exit_rcu kernel/softirq.c:420 [inline]
 irq_exit_rcu+0x134/0x200 kernel/softirq.c:432
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:199
Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 8e de 68 f8 48 89 ef e8 16 93 69 f8 e8 a1 d6 88 f8 fb bf 01 00 00 00 <e8> 46 a3 5d f8 65 8b 05 6f 3d 12 77 85 c0 74 02 5d c3 e8 ab 92 10
RSP: 0018:ffffc9000193fb58 EFLAGS: 00000202
RAX: 00000000002d6c79 RBX: 0000000000000001 RCX: 1ffffffff19df109
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffff8880b9e34fc0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff81788918 R11: 0000000000000000 R12: ffff8880b9e34fc0
R13: ffff88801b83d400 R14: 0000000000000000 R15: ffff88801e7c8000
 finish_lock_switch kernel/sched/core.c:4064 [inline]
 finish_task_switch.isra.0+0x158/0x7e0 kernel/sched/core.c:4181
 context_switch kernel/sched/core.c:4315 [inline]
 __schedule+0x914/0x21a0 kernel/sched/core.c:5063
 schedule+0xcf/0x270 kernel/sched/core.c:5142
 freezable_schedule include/linux/freezer.h:172 [inline]
 do_nanosleep+0x268/0x6a0 kernel/time/hrtimer.c:1878
 hrtimer_nanosleep+0x1f9/0x430 kernel/time/hrtimer.c:1931
 __do_sys_nanosleep kernel/time/hrtimer.c:1965 [inline]
 __se_sys_nanosleep kernel/time/hrtimer.c:1952 [inline]
 __x64_sys_nanosleep+0x1dc/0x260 kernel/time/hrtimer.c:1952
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c6e1
Code: 75 14 b8 23 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 cf fb ff c3 48 83 ec 08 e8 0a 47 00 00 48 89 04 24 b8 23 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 47 00 00 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffe98fbd170 EFLAGS: 00000293 ORIG_RAX: 0000000000000023
RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 000000000045c6e1
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffe98fbd180
RBP: 00000000000a3deb R08: 0000000000000000 R09: 0000000001b5f940
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000273
R13: 000000000000000a R14: 0000000000000032 R15: 00000000000a3d4f

Allocated by task 22607:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:404 [inline]
 ____kasan_kmalloc mm/kasan/common.c:435 [inline]
 ____kasan_kmalloc.constprop.0+0xa0/0xd0 mm/kasan/common.c:407
 kmalloc include/linux/slab.h:554 [inline]
 kernfs_get_open_node fs/kernfs/file.c:571 [inline]
 kernfs_fop_open+0x957/0xd40 fs/kernfs/file.c:717
 do_dentry_open+0x4b9/0x11b0 fs/open.c:817
 do_open fs/namei.c:3254 [inline]
 path_openat+0x1b9a/0x2730 fs/namei.c:3371
 do_filp_open+0x17e/0x3c0 fs/namei.c:3398
 do_sys_openat2+0x16d/0x420 fs/open.c:1172
 do_sys_open fs/open.c:1188 [inline]
 __do_sys_open fs/open.c:1196 [inline]
 __se_sys_open fs/open.c:1192 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1192
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 22607:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
 ____kasan_slab_free.part.0+0xe1/0x110 mm/kasan/common.c:365
 kasan_slab_free include/linux/kasan.h:188 [inline]
 slab_free_hook mm/slub.c:1548 [inline]
 slab_free_freelist_hook+0x82/0x1d0 mm/slub.c:1586
 slab_free mm/slub.c:3157 [inline]
 kfree+0xe5/0x5c0 mm/slub.c:4196
 kernfs_fop_release+0xe3/0x190 fs/kernfs/file.c:779
 __fput+0x283/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x190 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345
 __call_rcu kernel/rcu/tree.c:2988 [inline]
 call_rcu+0xbb/0x740 kernel/rcu/tree.c:3063
 nf_hook_entries_free net/netfilter/core.c:88 [inline]
 nf_hook_entries_free net/netfilter/core.c:75 [inline]
 __nf_unregister_net_hook+0x36f/0x610 net/netfilter/core.c:489
 nf_unregister_net_hook net/netfilter/core.c:502 [inline]
 nf_unregister_net_hooks+0x117/0x160 net/netfilter/core.c:576
 nf_ct_netns_do_put+0x2d6/0x520 net/netfilter/nf_conntrack_proto.c:546
 nf_ct_netns_put net/netfilter/nf_conntrack_proto.c:618 [inline]
 nf_ct_netns_put+0x56/0x80 net/netfilter/nf_conntrack_proto.c:610
 nf_conncount_destroy+0x45/0x190 net/netfilter/nf_conncount.c:581
 ovs_ct_limit_exit net/openvswitch/conntrack.c:1907 [inline]
 ovs_ct_exit+0x1f5/0x480 net/openvswitch/conntrack.c:2306
 ovs_exit_net+0x1e8/0xba0 net/openvswitch/datapath.c:2532
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:187
 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:604
 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

The buggy address belongs to the object at ffff888061d8ac00
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 0 bytes inside of
 128-byte region [ffff888061d8ac00, ffff888061d8ac80)
The buggy address belongs to the page:
page:0000000061e0285b refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x61d8a
flags: 0xfff00000000200(slab)
raw: 00fff00000000200 ffffea0000527a00 0000000900000009 ffff888010041640
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888061d8ab00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888061d8ab80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888061d8ac00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888061d8ac80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888061d8ad00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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