rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P13543/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=86133, q=665 ncpus=2)
task:rm              state:R  running task     stack:24200 pid:13543 ppid:13497  flags:0x00004002
Call Trace:
 <TASK>
 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:mas_validate_limits lib/maple_tree.c:7118 [inline]
RIP: 0010:mt_validate+0xcb2/0x4400 lib/maple_tree.c:7231
Code: f7 4d 85 f6 0f 94 c0 44 08 e0 3c 01 0f 85 9f 00 00 00 e8 31 76 11 f7 48 89 df 4c 89 fe e8 36 78 11 f7 4c 39 fb 4c 8b 64 24 10 <0f> 87 43 01 00 00 e8 13 76 11 f7 48 8b 9c 24 20 01 00 00 4c 89 ff
RSP: 0018:ffffc90004d577a0 EFLAGS: 00000293
RAX: ffffffff8a75b56a RBX: 0000000000000000 RCX: ffff88802bcd3c00
RDX: 0000000000000000 RSI: 00007f872f90cfff RDI: 0000000000000000
RBP: ffffc90004d57950 R08: ffff88802bcd3c00 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000001
R13: ffff8880653de008 R14: 0000000000000000 R15: 00007f872f90cfff
 validate_mm+0xc6/0x450 mm/mmap.c:288
 __split_vma+0xad4/0xc60 mm/mmap.c:2425
 mprotect_fixup+0xab7/0xca0 mm/mprotect.c:650
 do_mprotect_pkey+0x7c2/0xcb0 mm/mprotect.c:819
 __do_sys_mprotect mm/mprotect.c:840 [inline]
 __se_sys_mprotect mm/mprotect.c:837 [inline]
 __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:837
 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: 0033:0x7f872fc302c7
RSP: 002b:00007ffe0ce99f98 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007f872fc43da0 RCX: 00007f872fc302c7
RDX: 0000000000000001 RSI: 0000000000002000 RDI: 00007f872fc41000
RBP: 00007ffe0ce9a260 R08: 000000003de00ec7 R09: 0000000000000000
R10: 00007f872f97cc58 R11: 0000000000000206 R12: fffffffffffffff8
R13: 000001e1e26ec3e4 R14: 0000000000000000 R15: 00007f872fc44310
 </TASK>
rcu: rcu_preempt kthread starved for 10532 jiffies! g86133 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:26536 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1553/0x45a0 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x313/0x1590 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:pv_native_safe_halt+0xf/0x10 arch/x86/kernel/paravirt.c:148
Code: 88 1f 02 c3 cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d 43 e4 3f 00 fb f4 <c3> 66 0f 1f 00 55 41 57 41 56 41 54 53 50 8b 2f eb 2e 41 89 de 80
RSP: 0018:ffffc90000187de0 EFLAGS: 000002c2
RAX: bc1ffa0d320e4d00 RBX: ffffffff8162ae21 RCX: bc1ffa0d320e4d00
RDX: 0000000000000001 RSI: ffffffff8acacbe0 RDI: ffffffff8b1c9c20
RBP: ffffc90000187f20 R08: ffff8880b8f36bab R09: 1ffff110171e6d75
R10: dffffc0000000000 R11: ffffed10171e6d76 R12: 1ffff92000030fc8
R13: dffffc0000000000 R14: 1ffff110036cd780 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c28bfde CR3: 0000000077642000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:753
 default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97
 cpuidle_idle_call kernel/sched/idle.c:178 [inline]
 do_idle+0x221/0x590 kernel/sched/idle.c:302
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:401
 start_secondary+0xee/0xf0 arch/x86/kernel/smpboot.c:323
 secondary_startup_64_no_verify+0x179/0x17b
 </TASK>