rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9689/1:b..l rcu: (detected by 1, t=10502 jiffies, g=39277, q=22643 ncpus=2) task:syz.1.609 state:R running task stack:27016 pid:9689 ppid:8260 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1553/0x45a0 kernel/sched/core.c:6700 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7010 irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:lock_acquire+0x208/0x420 kernel/locking/lockdep.c:5758 Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 04 25 RSP: 0018:ffffc9000c937da0 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 5b8af914d50e1600 RDX: 0000000000000000 RSI: ffffffff8acadd60 RDI: ffffffff8b1c9860 RBP: ffffc9000c937ec0 R08: dffffc0000000000 R09: 1ffffffff2238ea0 R10: dffffc0000000000 R11: fffffbfff2238ea1 R12: 1ffff92001926fc0 R13: ffffffff8d132160 R14: 0000000000000246 R15: dffffc0000000000 rcu_lock_acquire include/linux/rcupdate.h:334 [inline] rcu_read_lock include/linux/rcupdate.h:786 [inline] __task_pid_nr_ns+0x48/0x470 kernel/pid.c:500 task_tgid_vnr include/linux/sched.h:1649 [inline] __ia32_sys_getpid+0x1d/0x20 kernel/sys.c:960 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f2d6cb96bd7 RSP: 002b:00007f2d6d993a48 EFLAGS: 00000206 ORIG_RAX: 0000000000000027 RAX: ffffffffffffffda RBX: 00007f2d6d993bb0 RCX: 00007f2d6cb96bd7 RDX: 00007f2d6d993a80 RSI: 00007f2d6d993bb0 RDI: 0000000000000021 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007f2d6ce16218 R14: 00007f2d6ce16180 R15: 00007ffd1b6e9f08