rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=fab/1/0x4000000000000000 softirq=22724/22725 fqs=5248 
	(t=10502 jiffies g=30277 q=40269)
NMI backtrace for cpu 1
CPU: 1 PID: 7712 Comm: syz.0.444 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x22f/0x380 kernel/rcu/tree_stall.h:349
 print_cpu_stall+0x31d/0x5f0 kernel/rcu/tree_stall.h:633
 check_cpu_stall kernel/rcu/tree_stall.h:727 [inline]
 rcu_pending kernel/rcu/tree.c:3936 [inline]
 rcu_sched_clock_irq+0x6d8/0x1110 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:1818
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1690 [inline]
 __hrtimer_run_queues+0x4fe/0xc40 kernel/time/hrtimer.c:1754
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1816
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:768 [inline]
RIP: 0010:xfs_icwalk_ag+0x17ff/0x19a0 fs/xfs/xfs_icache.c:1685
Code: 50 e8 85 c2 8a fe e9 c5 e9 ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 5e ff ff ff e8 9b 25 cf fe 48 8b 7c 24 40 e9 4f ff ff ff <e8> 6c 31 bb 06 89 c3 31 ff 89 c6 e8 b1 c5 8a fe 85 db 74 37 e8 c8
RSP: 0018:ffffc900033279a0 EFLAGS: 00000246
RAX: ffffffff82ecec2b RBX: 0000000000000000 RCX: ffff88807b8f9dc0
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003327c40 R08: dffffc0000000000 R09: ffffed100be3fc0e
R10: ffffed100be3fc0e R11: 1ffff1100be3fc0d R12: dffffc0000000000
R13: ffffc90003327aa0 R14: 0000000000000000 R15: ffffc90003327aa0
 xfs_icwalk fs/xfs/xfs_icache.c:1773 [inline]
 xfs_reclaim_inodes+0x188/0x260 fs/xfs/xfs_icache.c:993
 xfs_unmount_flush_inodes fs/xfs/xfs_mount.c:554 [inline]
 xfs_unmountfs+0x14f/0x250 fs/xfs/xfs_mount.c:1016
 xfs_fs_put_super+0x66/0x2b0 fs/xfs/xfs_super.c:1095
 generic_shutdown_super+0x130/0x300 fs/super.c:475
 kill_block_super+0x7c/0xe0 fs/super.c:1427
 deactivate_locked_super+0x93/0xf0 fs/super.c:335
 cleanup_mnt+0x418/0x4d0 fs/namespace.c:1139
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f55aa31238a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f55a8556e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffec RBX: 00007f55a8556ef0 RCX: 00007f55aa31238a
RDX: 0000200000009600 RSI: 0000200000009640 RDI: 00007f55a8556eb0
RBP: 0000200000009600 R08: 00007f55a8556ef0 R09: 0000000000a00c40
R10: 0000000000a00c40 R11: 0000000000000246 R12: 0000200000009640
R13: 00007f55a8556eb0 R14: 000000000000968d R15: 0000200000000380
 </TASK>
sched: RT throttling activated