------------[ cut here ]------------
WARNING: CPU: 0 PID: 8560 at kernel/rcu/tree_stall.h:1001 rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:993
Modules linked in:
CPU: 0 PID: 8560 Comm: syz.2.723 Not tainted 6.6.97-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:1001
Code: ff ff ff 48 c7 c7 a0 f4 ee 96 be 04 00 00 00 e8 5a 21 6e 00 48 89 df b8 01 00 00 00 87 05 bc ce 7e 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff c0 52 d3 8c 74 47 48 c7 c0 9c c7 4a 8e 48 c1 e8 03
RSP: 0018:ffffc90000007bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8cd352c0 RCX: ffffffff817025d6
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8cd352c0
RBP: ffffc90000007e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2ddde94 R12: 0000000000002904
R13: 1ffff110171c7a6a R14: 0000000000000a02 R15: dffffc0000000000
FS:  00007f242f7116c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f242ebb6168 CR3: 00000000306bc000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 rcu_core+0x612/0x1720 kernel/rcu/tree.c:2462
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:get_current arch/x86/include/asm/current.h:41 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x60 kernel/kcov.c:215
Code: 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d ac fe c4 0c 48 89 de 5b e9 43 de 57 00 cc cc cc f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0d 80 23 7e 7e 65 8b 15 81 23 7e 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc90005527cd0 EFLAGS: 00000246
RAX: ffffffff841f8df9 RBX: 00000000000000c0 RCX: 0000000000000000
RDX: 00000000000000c0 RSI: 00007f242f710b68 RDI: ffffc90005527d60
RBP: ffffc90005527f10 R08: ffffc90005527e5f R09: 0000000000000000
R10: ffffc90005527d60 R11: fffff52000aa4fcc R12: ffffc90005527d60
R13: 1ffff92000aa4ffe R14: ffffc90005527d60 R15: 00007f242f710b68
 _copy_from_user+0x19/0xe0 lib/usercopy.c:12
 copy_from_user include/linux/uaccess.h:183 [inline]
 restore_sigcontext arch/x86/kernel/signal_64.c:59 [inline]
 __ia32_sys_rt_sigreturn+0x27a/0x7b0 arch/x86/kernel/signal_64.c:266
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f242e92ab19
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007f242f710b40 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f242ebb6168 RCX: 00007f242e92ab19
RDX: 00007f242f710b40 RSI: 00007f242f710c70 RDI: 0000000000000011
RBP: 00007f242ebb6160 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f242ebb616c
R13: 0000000000000000 R14: 00007ffc1c39c950 R15: 00007ffc1c39ca38
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	f3 0f 1e fa          	endbr64
   6:	53                   	push   %rbx
   7:	48 89 fb             	mov    %rdi,%rbx
   a:	e8 13 00 00 00       	call   0x22
   f:	48 8b 3d ac fe c4 0c 	mov    0xcc4feac(%rip),%rdi        # 0xcc4fec2
  16:	48 89 de             	mov    %rbx,%rsi
  19:	5b                   	pop    %rbx
  1a:	e9 43 de 57 00       	jmp    0x57de62
  1f:	cc                   	int3
  20:	cc                   	int3
  21:	cc                   	int3
  22:	f3 0f 1e fa          	endbr64
  26:	48 8b 04 24          	mov    (%rsp),%rax
* 2a:	65 48 8b 0d 80 23 7e 	mov    %gs:0x7e7e2380(%rip),%rcx        # 0x7e7e23b2 <-- trapping instruction
  31:	7e
  32:	65 8b 15 81 23 7e 7e 	mov    %gs:0x7e7e2381(%rip),%edx        # 0x7e7e23ba
  39:	81 e2 00 01 ff 00    	and    $0xff0100,%edx
  3f:	74                   	.byte 0x74