------------[ cut here ]------------
WARNING: CPU: 0 PID: 5836 at ./include/linux/sched/signal.h:551 restore_saved_sigmask_unless include/linux/sched/signal.h:551 [inline]
WARNING: CPU: 0 PID: 5836 at ./include/linux/sched/signal.h:551 poll_select_finish+0x560/0x5e0 fs/select.c:301
Modules linked in:
CPU: 0 UID: 0 PID: 5836 Comm: syz.0.17 Not tainted syzkaller #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:551 [inline]
RIP: 0010:poll_select_finish+0x560/0x5e0 fs/select.c:301
Code: ff e9 3f fd ff ff e8 9f fa 81 ff e9 35 fd ff ff e8 95 fa 81 ff e9 2b fd ff ff e8 8b fa 81 ff e9 21 fd ff ff e8 81 fa 81 ff 90 <0f> 0b 90 e9 79 fc ff ff e8 73 fa 81 ff 49 bc 00 00 00 00 00 fc ff
RSP: 0018:ffffc90002aefce0 EFLAGS: 00010293
RAX: ffffffff823e590f RBX: 0000000000000000 RCX: ffff888035872480
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002aefdf0 R08: ffff888035872487 R09: 1ffff11006b0e490
R10: dffffc0000000000 R11: ffffed1006b0e491 R12: dffffc0000000000
R13: 00000000fffffdfe R14: 1ffff9200055dfa0 R15: ffff888035872480
FS:  00007fb58754f6c0(0000) GS:ffff88808d301000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000186 CR3: 000000000dc5d000 CR4: 0000000000352ef0
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+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb58678e969
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:00007fb58754f038 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
RAX: ffffffffffffffda RBX: 00007fb5869b6080 RCX: 00007fb58678e969
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000200000000180
RBP: 00007fb586810ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb5869b6080 R15: 00007ffe63d910d8
 </TASK>