------------[ cut here ]------------
WARNING: CPU: 0 PID: 10444 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: 10444 Comm: syz.0.1714 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:1001
Code: ff ff ff 48 c7 c7 a0 c4 ee 96 be 04 00 00 00 e8 2a a8 6c 00 48 89 df b8 01 00 00 00 87 05 4c 8f 7e 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff 00 54 d3 8c 74 47 48 c7 c0 9c b9 4a 8e 48 c1 e8 03
RSP: 0018:ffffc90000007bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8cd35400 RCX: ffffffff81703546
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8cd35400
RBP: ffffc90000007e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2ddd894 R12: 0000000000002904
R13: 1ffff110171c7a6a R14: 0000000000000a02 R15: dffffc0000000000
FS:  000055555c8ae500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d71dff8 CR3: 0000000076540000 CR4: 00000000003506f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
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_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0xa1/0xc0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723
RIP: 0010:rcu_read_unlock_special+0x88/0x4c0 kernel/rcu/tree_plugin.h:682
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 a9 4e 93 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc9001867fc00 EFLAGS: 00000206
RAX: c5592f2e17213500 RBX: 1ffff920030cff88 RCX: c5592f2e17213500
RDX: dffffc0000000000 RSI: ffffffff8aaaba40 RDI: ffffffff8afc6780
RBP: ffffc9001867fcf0 R08: ffffffff90da3537 R09: 1ffffffff21b46a6
R10: dffffc0000000000 R11: fffffbfff21b46a7 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8cd354d8
 __rcu_read_unlock+0x7c/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock+0x85/0xa0 include/linux/rcupdate.h:818
 dput+0xe6/0x1e0 fs/dcache.c:911
 __fput+0x5e5/0x970 fs/file_table.c:392
 task_work_run+0x1ce/0x250 kernel/task_work.c:239
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f686318eb69
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:00007fff7bce2708 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000004fe8d RCX: 00007f686318eb69
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f68633b7ba0 R08: 0000000000000001 R09: 0000000b7bce29ff
R10: 00007f6862e00000 R11: 0000000000000246 R12: 00007f68633b5fac
R13: 00007f68633b5fa0 R14: ffffffffffffffff R15: 00007fff7bce2820
 </TASK>
----------------
Code disassembly (best guess):
   0:	f1                   	int1
   1:	f1                   	int1
   2:	f1                   	int1
   3:	00 f2                	add    %dh,%dl
   5:	f2 f2 4a 89 04 2b    	repnz repnz mov %rax,(%rbx,%r13,1)
   b:	66 42 c7 44 2b 09 f3 	movw   $0xf3f3,0x9(%rbx,%r13,1)
  12:	f3
  13:	42 c6 44 2b 0b f3    	movb   $0xf3,0xb(%rbx,%r13,1)
  19:	65 44 8b 35 a9 4e 93 	mov    %gs:0x7e934ea9(%rip),%r14d        # 0x7e934eca
  20:	7e
  21:	41 f7 c6 00 00 f0 00 	test   $0xf00000,%r14d
  28:	74 45                	je     0x6f
* 2a:	48 c7 44 24 40 0e 36 	movq   $0x45e0360e,0x40(%rsp) <-- trapping instruction
  31:	e0 45
  33:	4a c7 04 2b 00 00 00 	movq   $0x0,(%rbx,%r13,1)
  3a:	00
  3b:	66                   	data16
  3c:	42                   	rex.X
  3d:	c7                   	.byte 0xc7
  3e:	44                   	rex.R
  3f:	2b                   	.byte 0x2b