rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (0 ticks this GP) idle=433/1/0x4000000000000002 softirq=32252/32252 fqs=5249 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P12241 (detected by 1, t=10502 jiffies, g=43637, q=784) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 12241 Comm: syz.0.1949 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:331 [inline] RIP: 0010:rcu_is_watching+0xc/0xa0 kernel/rcu/tree.c:1123 Code: 5d c3 e8 b7 3e 45 08 41 f7 c7 00 02 00 00 75 b8 eb b7 e8 97 3e 45 08 0f 1f 80 00 00 00 00 41 57 41 56 53 65 ff 05 7c c0 9e 7e 8f 4e 45 08 89 c3 83 f8 08 73 5c 49 bf 00 00 00 00 00 fc ff df RSP: 0018:ffffc90002d3f520 EFLAGS: 00000007 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff815bf8bb RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8d698de8 RBP: ffffc90002d3f658 R08: dffffc0000000000 R09: fffffbfff1ad31be R10: fffffbfff1ad31be R11: 1ffffffff1ad31bd R12: ffffffff8c11c460 R13: 1ffff920005a7eb4 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000555593de0500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000024d29000 CR4: 00000000003506f0 DR0: 0000200000000380 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0xcd/0x3f0 kernel/locking/lockdep.c:5594 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:312 rcu_read_lock include/linux/rcupdate.h:739 [inline] __perf_event_output kernel/events/core.c:7800 [inline] perf_event_output_forward+0x9e/0x280 kernel/events/core.c:7822 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515 perf_tp_event+0x32c/0xb50 kernel/events/core.c:10047 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021 perf_trace_preemptirq_template+0x2be/0x380 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713 RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:674 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 dd 13 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc90002d3fcc0 EFLAGS: 00000206 RAX: 8cddc4f0b8b24700 RBX: 1ffff920005a7f9c RCX: 8cddc4f0b8b24700 RDX: dffffc0000000000 RSI: ffffffff8a0b1620 RDI: ffffffff8a59a240 RBP: ffffc90002d3fd88 R08: dffffc0000000000 R09: fffffbfff1ff761a R10: fffffbfff1ff761a R11: 1ffffffff1ff7619 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8c1209a0 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock+0x85/0x90 include/linux/rcupdate.h:771 dput+0xc0/0x1a0 fs/dcache.c:886 __fput+0x5ee/0x930 fs/file_table.c:319 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: 0033:0x7f791ffb6be9 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:00007ffd16667a38 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 000000000004d4d9 RCX: 00007f791ffb6be9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f79201efda0 R08: 0000000000000001 R09: 0000001e16667d2f R10: 0000001b2d220000 R11: 0000000000000246 R12: 00007f79201edfac R13: 00007f79201edfa0 R14: ffffffffffffffff R15: 00007ffd16667b50 task:syz.0.1949 state:R running task stack:27360 pid:12241 ppid: 9777 flags:0x0000400c Call Trace: