------------[ cut here ]------------
WARNING: CPU: 1 PID: 3620 at kernel/sched/wait.c:245 __wake_up_pollfree+0x40/0x50 kernel/sched/wait.c:246
Modules linked in:
CPU: 1 PID: 3620 Comm: syz-executor.2 Not tainted 5.16.0-rc8-next-20220104-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__wake_up_pollfree+0x40/0x50 kernel/sched/wait.c:245
Code: f3 ff ff 48 8d 6b 40 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00 75 11 48 8b 43 40 48 39 c5 75 03 5b 5d c3 <0f> 0b 5b 5d c3 48 89 ef e8 13 d8 69 00 eb e5 cc 48 c1 e7 06 48 63
RSP: 0018:ffffc9000285f9f8 EFLAGS: 00010002
RAX: ffff888049926df0 RBX: ffff888057f0ef48 RCX: 0000000000000000
RDX: 1ffff1100afe1df1 RSI: 0000000000000004 RDI: 0000000000000001
RBP: ffff888057f0ef88 R08: 0000000000000000 R09: ffff888057f0ef4b
R10: ffffed100afe1de9 R11: 0000000000000000 R12: ffff888057f0ef40
R13: ffff88801943d7c0 R14: dffffc0000000000 R15: ffff88801f39a880
FS:  0000555556c7a400(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2db27000 CR3: 000000005a144000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 wake_up_pollfree include/linux/wait.h:271 [inline]
 signalfd_cleanup+0x42/0x60 fs/signalfd.c:38
 __cleanup_sighand kernel/fork.c:1596 [inline]
 __cleanup_sighand+0x72/0xb0 kernel/fork.c:1593
 __exit_signal kernel/exit.c:159 [inline]
 release_task+0xc02/0x17e0 kernel/exit.c:200
 wait_task_zombie kernel/exit.c:1117 [inline]
 wait_consider_task+0x2fa6/0x3b80 kernel/exit.c:1344
 do_wait_thread kernel/exit.c:1407 [inline]
 do_wait+0x6ca/0xce0 kernel/exit.c:1524
 kernel_wait4+0x14c/0x260 kernel/exit.c:1687
 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1715
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f9b92a0c337
Code: 89 7c 24 10 48 89 4c 24 18 e8 35 50 02 00 4c 8b 54 24 18 8b 54 24 14 41 89 c0 48 8b 74 24 08 8b 7c 24 10 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 89 44 24 10 e8 65 50 02 00 8b 44
RSP: 002b:00007fffa757e570 EFLAGS: 00000293 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 000000000000064d RCX: 00007f9b92a0c337
RDX: 0000000040000001 RSI: 00007fffa757e5fc RDI: 00000000ffffffff
RBP: 00007fffa757e5fc R08: 0000000000000000 R09: 00007fffa75f3080
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032
R13: 000000000008e2ca R14: 000000000000000a R15: 00007fffa757e660
 </TASK>