------------[ cut here ]------------
WARNING: CPU: 1 PID: 6441 at kernel/rcu/tree_stall.h:1001 rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:993
Modules linked in:
CPU: 1 PID: 6441 Comm: syz.3.191 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:1001
Code: ff ff ff 48 c7 c7 a0 54 30 97 be 04 00 00 00 e8 7a 0d 6e 00 48 89 df b8 01 00 00 00 87 05 6c 06 bf 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff 00 70 13 8d 74 47 48 c7 c0 9c 1a 8b 8e 48 c1 e8 03
RSP: 0018:ffffc900001f0bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8d137000 RCX: ffffffff81714e26
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8d137000
RBP: ffffc900001f0e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2e60a94 R12: 0000000000002904
R13: 1ffff9200003e194 R14: 0000000000000a02 R15: dffffc0000000000
FS:  00007f9a127e36c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6b1cf0513f CR3: 000000007ca32000 CR4: 00000000003526e0
Call Trace:
 <IRQ>
 rcu_core+0x5ec/0x17f0 kernel/rcu/tree.c:2462
 handle_softirqs+0x27d/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 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:check_kcov_mode kernel/kcov.c:193 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x36/0x60 kernel/kcov.c:216
Code: e0 d2 7c 7e 65 8b 15 e1 d2 7c 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 1c 16 00 00 00 74 2c 8b 91 f8 15 00 00 <83> fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 8d 7e 01 8b 89 fc
RSP: 0018:ffffc9000bc0fea0 EFLAGS: 00000246
RAX: ffffffff81873f21 RBX: dffffc0000000000 RCX: ffff88802cf23c00
RDX: 0000000000000002 RSI: ffffffff8d177fc0 RDI: 0000000000000002
RBP: 00000000000000ca R08: ffff88802cf23c00 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000002 R12: 0000000000000002
R13: ffff88802cf23c20 R14: ffff88802cf23c00 R15: 0000000000000000
 __secure_computing+0x111/0x2f0 kernel/seccomp.c:1352
 syscall_trace_enter+0xa7/0x150 kernel/entry/common.c:72
 do_syscall_64+0x28/0xb0 arch/x86/entry/common.c:72
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9a1199ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9a127e30e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f9a11c15fa8 RCX: 00007f9a1199ce59
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f9a11c15fa8
RBP: 00007f9a11c15fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9a11c16038 R14: 00007ffcc9325550 R15: 00007ffcc9325638
 </TASK>
----------------
Code disassembly (best guess):
   0:	e0 d2                	loopne 0xffffffd4
   2:	7c 7e                	jl     0x82
   4:	65 8b 15 e1 d2 7c 7e 	mov    %gs:0x7e7cd2e1(%rip),%edx        # 0x7e7cd2ec
   b:	81 e2 00 01 ff 00    	and    $0xff0100,%edx
  11:	74 11                	je     0x24
  13:	81 fa 00 01 00 00    	cmp    $0x100,%edx
  19:	75 35                	jne    0x50
  1b:	83 b9 1c 16 00 00 00 	cmpl   $0x0,0x161c(%rcx)
  22:	74 2c                	je     0x50
  24:	8b 91 f8 15 00 00    	mov    0x15f8(%rcx),%edx
* 2a:	83 fa 02             	cmp    $0x2,%edx <-- trapping instruction
  2d:	75 21                	jne    0x50
  2f:	48 8b 91 00 16 00 00 	mov    0x1600(%rcx),%rdx
  36:	48 8b 32             	mov    (%rdx),%rsi
  39:	48 8d 7e 01          	lea    0x1(%rsi),%rdi
  3d:	8b                   	.byte 0x8b
  3e:	89 fc                	mov    %edi,%esp