------------[ cut here ]------------
WARNING: CPU: 0 PID: 14 at kernel/rcu/tasks.h:901 trc_read_check_handler+0x248/0x2e0 kernel/rcu/tasks.h:920
Modules linked in:
CPU: 0 PID: 14 Comm: rcu_preempt Not tainted 5.15.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:trc_read_check_handler+0x248/0x2e0 kernel/rcu/tasks.h:901
Code: 48 c1 ea 03 0f b6 04 02 4c 89 e2 83 e2 07 38 d0 7f 0c 84 c0 74 08 4c 89 e7 e8 84 86 5c 00 c6 83 21 04 00 00 01 e9 5a fe ff ff <0f> 0b 31 c9 ba 01 00 00 00 be 03 00 00 00 48 c7 c7 40 f6 97 8b e8
RSP: 0018:ffffc90000007f78 EFLAGS: 00010047
RAX: 0000000000000001 RBX: ffff888011ef9c80 RCX: ffffffff8160ff50
RDX: fffffbfff204bb84 RSI: 0000000000000004 RDI: ffffffff9025dc20
RBP: ffff888011ef9c80 R08: 0000000000000001 R09: 0000000000000003
R10: fffffbfff204bb84 R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b9d32ac8
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f20faeece21 CR3: 0000000050097000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 flush_smp_call_function_queue+0x34b/0x640 kernel/smp.c:663
 __sysvec_call_function_single+0x95/0x3d0 arch/x86/kernel/smp.c:248
 sysvec_call_function_single+0x8e/0xc0 arch/x86/kernel/smp.c:243
 </IRQ>
 asm_sysvec_call_function_single+0x12/0x20 arch/x86/include/asm/idtentry.h:646
RIP: 0010:rcu_gp_init+0x39e/0x12a0 kernel/rcu/tree.c:1788
Code: 43 b0 48 89 44 24 08 48 c1 e8 03 42 80 3c 20 00 0f 85 fd 0a 00 00 4d 8b 75 78 41 f6 c6 01 0f 85 5d 01 00 00 f0 83 44 24 fc 00 <48> c7 c7 00 97 98 8b e8 46 64 d6 07 4c 89 ef e8 3e 65 d6 07 48 8d
RSP: 0018:ffffc90000d37df0 EFLAGS: 00000286
RAX: 1ffffffff17311f7 RBX: ffffffff8b989008 RCX: 0000000000000000
RDX: 1ffffffff1731268 RSI: 0000000000000001 RDI: ffffffff8b989340
RBP: ffffffff8b988ffa R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000003 R11: 0000000000000001 R12: dffffc0000000000
R13: ffffffff8b988f40 R14: 0000000000000004 R15: ffff888011ef9c80
 rcu_gp_kthread+0xab/0x320 kernel/rcu/tree.c:2120
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
----------------
Code disassembly (best guess):
   0:	43 b0 48             	rex.XB mov $0x48,%r8b
   3:	89 44 24 08          	mov    %eax,0x8(%rsp)
   7:	48 c1 e8 03          	shr    $0x3,%rax
   b:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  10:	0f 85 fd 0a 00 00    	jne    0xb13
  16:	4d 8b 75 78          	mov    0x78(%r13),%r14
  1a:	41 f6 c6 01          	test   $0x1,%r14b
  1e:	0f 85 5d 01 00 00    	jne    0x181
  24:	f0 83 44 24 fc 00    	lock addl $0x0,-0x4(%rsp)
* 2a:	48 c7 c7 00 97 98 8b 	mov    $0xffffffff8b989700,%rdi <-- trapping instruction
  31:	e8 46 64 d6 07       	callq  0x7d6647c
  36:	4c 89 ef             	mov    %r13,%rdi
  39:	e8 3e 65 d6 07       	callq  0x7d6657c
  3e:	48                   	rex.W
  3f:	8d                   	.byte 0x8d