rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P29716/1:b.el rcu: (detected by 1, t=10002 jiffies, g=36009, q=3278 ncpus=2) task:syz.8.9672 state:R running task stack:0 pid:29716 tgid:29714 ppid:29240 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5945 [inline] __schedule+0x1322/0x1df0 kernel/sched/core.c:7791 preempt_schedule_common+0x2d/0x60 kernel/sched/core.c:7974 preempt_schedule+0xb0/0xd0 kernel/sched/core.c:7998 preempt_schedule_thunk+0x1a/0x40 arch/x86/entry/thunk.S:12 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_unlock+0x5c/0x60 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] zap_pte_range mm/memory.c:1715 [inline] zap_pmd_range mm/memory.c:1763 [inline] zap_pud_range mm/memory.c:1792 [inline] zap_p4d_range mm/memory.c:1813 [inline] unmap_page_range+0x35b4/0x3f80 mm/memory.c:1834 unmap_single_vma mm/memory.c:1880 [inline] unmap_vmas+0x2c5/0x3e0 mm/memory.c:1924 exit_mmap+0x25b/0xb60 mm/mmap.c:1962 __mmput+0x93/0x320 kernel/fork.c:1349 mmput+0x55/0x170 kernel/fork.c:1372 exit_mm kernel/exit.c:574 [inline] do_exit+0x918/0x2630 kernel/exit.c:940 do_group_exit+0x22a/0x300 kernel/exit.c:1095 get_signal+0x139d/0x14f0 kernel/signal.c:2933 arch_do_signal_or_restart+0x96/0x720 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+0x58/0xb0 kernel/entry/common.c:218 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7ff62f78ec29 RSP: 002b:00007ff62e1f70e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007ff62f9d6098 RCX: 00007ff62f78ec29 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007ff62f9d6098 RBP: 00007ff62f9d6090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff62f9d6128 R14: 00007ffdabb8d880 R15: 00007ffdabb8d968