------------[ cut here ]------------
WARNING: CPU: 1 PID: 9242 at kernel/signal.c:376 task_participate_group_stop+0x2c0/0x370 kernel/signal.c:376
Modules linked in:
CPU: 1 PID: 9242 Comm: 3 Not tainted 5.14.0-rc5-next-20210813-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:task_participate_group_stop+0x2c0/0x370 kernel/signal.c:376
Code: 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 9d 00 00 00 48 8b ab 00 05 00 00 e9 d0 fd ff ff e8 b0 d7 2d 00 <0f> 0b e9 81 fe ff ff 48 89 ef e8 41 8d 73 00 e9 4b fe ff ff e8 97
RSP: 0018:ffffc90002eefc50 EFLAGS: 00010093
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88805d609c80 RSI: ffffffff8147f9b0 RDI: 0000000000000003
RBP: ffff888024ba75a8 R08: 0000000000000000 R09: 0000000000000003
R10: ffffffff8147f820 R11: 0000000000000000 R12: ffff888024ba7500
R13: ffff88805d60a180 R14: 0000000000040000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000ffefa93b CR3: 0000000060910000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_signal_stop+0x1f1/0x850 kernel/signal.c:2436
 get_signal+0xc84/0x2160 kernel/signal.c:2696
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0023:0xb7000000
Code: Unable to access opcode bytes at RIP 0xb6ffffd6.
RSP: 002b:00000000ffefa860 EFLAGS: 00000200 ORIG_RAX: 000000000000000b
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
----------------
Code disassembly (best guess), 7 bytes skipped:
   0:	df 4c 89 ea          	fisttps -0x16(%rcx,%rcx,4)
   4:	48 c1 ea 03          	shr    $0x3,%rdx
   8:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   c:	0f 85 9d 00 00 00    	jne    0xaf
  12:	48 8b ab 00 05 00 00 	mov    0x500(%rbx),%rbp
  19:	e9 d0 fd ff ff       	jmpq   0xfffffdee
  1e:	e8 b0 d7 2d 00       	callq  0x2dd7d3
  23:	0f 0b                	ud2     <-- trapping instruction
  25:	e9 81 fe ff ff       	jmpq   0xfffffeab
  2a:	48 89 ef             	mov    %rbp,%rdi
  2d:	e8 41 8d 73 00       	callq  0x738d73
  32:	e9 4b fe ff ff       	jmpq   0xfffffe82
  37:	e8                   	.byte 0xe8
  38:	97                   	xchg   %eax,%edi