rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P22718/1:b..l rcu: (detected by 1, t=10502 jiffies, g=96797, q=637 ncpus=2) task:syz-executor state:R running task stack:22144 pid:22718 tgid:22718 ppid:22699 task_flags:0x400140 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5510 [inline] __schedule+0x16dc/0x5500 kernel/sched/core.c:7234 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline] irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:lock_release+0x2d7/0x3c0 kernel/locking/lockdep.c:5893 Code: 8b fc 10 00 00 00 00 eb b5 e8 35 5b a0 09 f7 c3 00 02 00 00 74 b9 65 48 8b 05 05 46 fc 10 48 3b 44 24 28 75 44 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 02 da 11 RSP: 0018:ffffc9000e367090 EFLAGS: 00000286 RAX: 57db660b2e977200 RBX: 0000000000000206 RCX: 0000000000000046 RDX: 00000000675db4b6 RSI: ffffffff8daf088d RDI: ffffffff8bca5f80 RBP: ffff88806150aba8 R08: ffffffff8b43a9a0 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8e1c3000 R12: 0000000000000005 R13: 0000000000000005 R14: ffff88813ffafd58 R15: ffff888061509f00 rt_spin_unlock+0x29/0x200 kernel/locking/spinlock_rt.c:80 spin_unlock_irqrestore include/linux/spinlock_rt.h:129 [inline] __slab_free+0x20a/0x2a0 mm/slub.c:-1 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4612 [inline] slab_alloc_node mm/slub.c:4945 [inline] kmem_cache_alloc_noprof+0x355/0x650 mm/slub.c:4959 ptlock_alloc+0x20/0x70 mm/memory.c:7531 ptlock_init include/linux/mm.h:3775 [inline] pagetable_pte_ctor include/linux/mm.h:3824 [inline] __pte_alloc_one_noprof include/asm-generic/pgalloc.h:79 [inline] pte_alloc_one+0x7e/0x380 arch/x86/mm/pgtable.c:18 __pte_alloc+0x25/0x1a0 mm/memory.c:453 copy_pte_range mm/memory.c:1253 [inline] copy_pmd_range+0x4b01/0x53e0 mm/memory.c:1408 copy_pud_range mm/memory.c:1445 [inline] copy_p4d_range mm/memory.c:1469 [inline] copy_page_range+0xb34/0x1160 mm/memory.c:1555 dup_mmap+0xf2d/0x1d40 mm/mmap.c:1840 dup_mm kernel/fork.c:1543 [inline] copy_mm+0x11a/0x480 kernel/fork.c:1595 copy_process+0x1e46/0x4390 kernel/fork.c:2289 kernel_clone+0x2d2/0x8d0 kernel/fork.c:2748 __do_sys_clone kernel/fork.c:2889 [inline] __se_sys_clone kernel/fork.c:2873 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2873 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f598d0c68d2 RSP: 002b:00007ffeafd2aa00 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffeafd2aa00 RCX: 00007f598d0c68d2 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffeafd2ab8c R08: 0000000000000000 R09: 0000000000000001 R10: 000055556b3ff7d0 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000000927c0 R14: 0000000000139de3 R15: 00007ffeafd2abe0