syzbot

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WARNING: CPU: 0 PID: 5520 at ./include/linux/sched/signal.h:547 restore_saved_sigmask_unless include/linux/sched/signal.h:547 [inline]
WARNING: CPU: 0 PID: 5520 at ./include/linux/sched/signal.h:547 poll_select_finish+0x56b/0x5f0 fs/select.c:301
Modules linked in:
CPU: 0 UID: 0 PID: 5520 Comm: syz.0.22 Not tainted 6.15.0-rc4-syzkaller-00042-gb6ea1680d0ac #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:restore_saved_sigmask_unless include/linux/sched/signal.h:547 [inline]
RIP: 0010:poll_select_finish+0x56b/0x5f0 fs/select.c:301
Code: ff e9 3f fd ff ff e8 34 e1 87 ff e9 35 fd ff ff e8 2a e1 87 ff e9 2b fd ff ff e8 20 e1 87 ff e9 21 fd ff ff e8 16 e1 87 ff 90 <0f> 0b 90 e9 79 fc ff ff e8 08 e1 87 ff 49 bc 00 00 00 00 00 fc ff
RSP: 0018:ffffc9000cf5fd00 EFLAGS: 00010293
RAX: ffffffff8237ddba RBX: 0000000000000000 RCX: ffff88801f50a440
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000cf5fe10 R08: ffff88801f50a447 R09: 1ffff11003ea1488
R10: dffffc0000000000 R11: ffffed1003ea1489 R12: dffffc0000000000
R13: 00000000fffffdfe R14: 1ffff920019ebfa4 R15: ffff88801f50a440
FS:  00007f9833a3c6c0(0000) GS:ffff88808d6cc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000186 CR3: 0000000033e93000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __do_sys_ppoll fs/select.c:1116 [inline]
 __se_sys_ppoll+0x213/0x260 fs/select.c:1095
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9832b8e969
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9833a3c038 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
RAX: ffffffffffffffda RBX: 00007f9832db6080 RCX: 00007f9832b8e969
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000200000000180
RBP: 00007f9832c10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9832db6080 R15: 00007ffd0920d8d8
 </TASK>