rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 GPs behind) idle=553/1/0x4000000000000002 softirq=28304/28305 fqs=2100 (detected by 1, t=10505 jiffies, g=37289, q=7706) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 11013 Comm: syz.3.1505 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:trace_lock_release include/trace/events/lock.h:58 [inline] RIP: 0010:lock_release+0xae/0x8a0 kernel/locking/lockdep.c:5634 Code: 83 fb 08 0f 83 4e 05 00 00 89 d8 c1 e8 06 48 8d 3c c5 e8 ea 8a 8d be 08 00 00 00 e8 6c b9 60 00 89 d8 48 0f a3 05 9a 91 2d 0c <73> 0d e8 2b 44 07 00 84 c0 0f 84 53 05 00 00 48 c7 c0 84 1e 8b 8d RSP: 0018:ffffc9000346eb60 EFLAGS: 00000057 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff815d5944 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8d8aeae8 RBP: ffffc9000346ec70 R08: ffffffff8d8aeaef R09: 1ffffffff1b15d5d R10: dffffc0000000000 R11: fffffbfff1b15d5e R12: 1ffff9200068dd78 R13: dffffc0000000000 R14: ffff888060974118 R15: 1ffff9200068dd78 FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f62ea0bc540 CR3: 000000007b8de000 CR4: 00000000003506f0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __perf_output_begin kernel/events/ring_buffer.c:262 [inline] perf_output_begin_forward+0x793/0xa30 kernel/events/ring_buffer.c:271 __perf_event_output kernel/events/core.c:7804 [inline] perf_event_output_forward+0x19b/0x2e0 kernel/events/core.c:7822 __perf_event_overflow+0x35f/0x550 kernel/events/core.c:9515 perf_tp_event+0x324/0xbe0 kernel/events/core.c:10047 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021 perf_trace_preemptirq_template+0x2aa/0x360 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+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674 Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 c2 22 9d 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc9000346f3e0 EFLAGS: 00000206 RAX: 167509ef323da100 RBX: 1ffff9200068de80 RCX: 167509ef323da100 RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a2a40 RBP: ffffc9000346f4b0 R08: ffffffff901e90c7 R09: 1ffffffff203d218 R10: dffffc0000000000 R11: fffffbfff203d219 R12: ffffffff8c323400 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:772 [inline] __unlock_page_memcg+0xea/0x100 mm/memcontrol.c:2093 zap_pte_range mm/memory.c:1384 [inline] zap_pmd_range mm/memory.c:1505 [inline] zap_pud_range mm/memory.c:1534 [inline] zap_p4d_range mm/memory.c:1555 [inline] unmap_page_range+0xee4/0x2410 mm/memory.c:1576 unmap_vmas+0x131/0x250 mm/memory.c:1653 exit_mmap+0x3b9/0x640 mm/mmap.c:3216 __mmput+0x115/0x390 kernel/fork.c:1128 exit_mm+0x632/0x7b0 kernel/exit.c:551 do_exit+0x5b8/0x2110 kernel/exit.c:871 do_group_exit+0x12c/0x2f0 kernel/exit.c:998 get_signal+0x7eb/0x12e0 kernel/signal.c:2901 arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xee/0x180 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: 0033:0x7f252e1d1e59 Code: Unable to access opcode bytes at RIP 0x7f252e1d1e2f. RSP: 002b:00007f252c42a0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f252e459fa8 RCX: 00007f252e1d1e59 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f252e459fa8 RBP: 00007f252e459fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f252e45a038 R14: 00007ffd06b7de00 R15: 00007ffd06b7dee8