rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6986/1:b..l rcu: (detected by 0, t=10502 jiffies, g=18049, q=22200 ncpus=2) task:syz.2.186 state:R running task stack:24912 pid:6986 tgid:6985 ppid:6270 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x18af/0x4bd0 kernel/sched/core.c:6690 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7012 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:preempt_schedule+0x4/0xf0 kernel/sched/core.c:6886 Code: e7 93 f5 e9 59 fa 20 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <55> 48 89 e5 41 57 41 56 41 54 53 48 83 e4 e0 48 83 ec 60 65 48 8b RSP: 0018:ffffc9000b7a7290 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff8880882eb5a0 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001 RBP: ffffc9000b7a72e0 R08: ffff8880882eb5a3 R09: 1ffff1101105d6b4 R10: dffffc0000000000 R11: ffffed101105d6b5 R12: dffffc0000000000 R13: 000000110c35e000 R14: ffffc9000b7a7501 R15: ffffc9000b7a75a0 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] zap_pte_range mm/memory.c:1691 [inline] zap_pmd_range mm/memory.c:1739 [inline] zap_pud_range mm/memory.c:1768 [inline] zap_p4d_range mm/memory.c:1789 [inline] unmap_page_range+0x36b1/0x40e0 mm/memory.c:1810 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1900 exit_mmap+0x275/0xc40 mm/mmap.c:1912 __mmput+0x115/0x390 kernel/fork.c:1347 exit_mm+0x220/0x310 kernel/exit.c:571 do_exit+0x9b2/0x28e0 kernel/exit.c:926 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 get_signal+0x16a3/0x1740 kernel/signal.c:2917 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f080d37e719 RSP: 002b:00007f080e0f6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000cb RAX: 0000000000000000 RBX: 00007f080d535f80 RCX: 00007f080d37e719 RDX: 0000000020000040 RSI: 0000000000000008 RDI: 0000000000000000 RBP: 00007f080d3f132e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f080d535f80 R15: 00007fffdd9a7eb8