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WARNING: CPU: 0 PID: 5504 at mm/vmscan.c:681 register_shrinker_prepared+0xe9/0x120
Modules linked in:
CPU: 0 PID: 5504 Comm: syz-executor.3 Not tainted 5.19.0-rc1-next-20220606 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:register_shrinker_prepared+0xe9/0x120
Code: 00 31 ff 89 c5 89 c6 e8 85 af e4 ff 85 ed 75 15 e8 ac b2 e4 ff 48 c7 c7 60 74 28 85 5b 5d 41 5c e9 3c 05 c8 ff e8 97 b2 e4 ff <0f> 0b eb e2 e8 ce bf 17 00 eb c0 48 89 df e8 54 c0 17 00 eb 89 e8
RSP: 0018:ffff88801b98fc30 EFLAGS: 00010212
RAX: 0000000000001814 RBX: ffff8880408d8778 RCX: ffffc900031d8000
RDX: 0000000000040000 RSI: ffffffff815f98c9 RDI: 0000000000000005
RBP: 00000000fffffff4 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000fffffff4 R11: 0000000000000001 R12: ffff888042c4a778
R13: ffff888042c4a150 R14: ffff888042c4a000 R15: ffffffff853cf320
FS:  00007f70423a7700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f70423a6f78 CR3: 0000000020464000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 sget_fc+0x5c0/0x7a0
 get_tree_nodev+0x24/0x1d0
 mqueue_get_tree+0xee/0x130
 vfs_get_tree+0x8e/0x2f0
 fc_mount+0x13/0xc0
 mq_init_ns+0x43e/0x630
 copy_ipcs+0x35e/0x5d0
 create_new_namespaces+0x210/0xb30
 unshare_nsproxy_namespaces+0xc1/0x1f0
 ksys_unshare+0x445/0x8d0
 __x64_sys_unshare+0x2d/0x40
 do_syscall_64+0x3b/0x90
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f7044e31b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f70423a7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f7044f44f60 RCX: 00007f7044e31b19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006a040400
RBP: 00007f70423a71d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffe711913ff R14: 00007f70423a7300 R15: 0000000000022000
 </TASK>
irq event stamp: 1017
hardirqs last  enabled at (1027): [<ffffffff812aeb28>] __up_console_sem+0x78/0x80
hardirqs last disabled at (1038): [<ffffffff812aeb0d>] __up_console_sem+0x5d/0x80
softirqs last  enabled at (490): [<ffffffff81166d33>] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (441): [<ffffffff81166d33>] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---