rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P12359/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=69017, q=1954 ncpus=2)
task:syz.5.1545      state:R  running task     stack:24944 pid:12359 tgid:12357 ppid:5825   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x14bc/0x5000 kernel/sched/core.c:6863
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190
 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:ma_slots lib/maple_tree.c:708 [inline]
RIP: 0010:mtree_range_walk+0x3d2/0x840 lib/maple_tree.c:2578
Code: 74 08 4c 89 f7 e8 6e a1 df f6 4d 8b 26 49 ff c4 4c 8b 74 24 38 48 8b 7c 24 30 48 c7 c6 10 5d 68 8f e8 e2 5c 79 f6 41 83 fe 01 <7f> 12 45 85 f6 74 2e 41 83 fe 01 75 1e e8 4c 57 79 f6 eb 31 41 83
RSP: 0018:ffffc9000b88f440 EFLAGS: 00000202
RAX: 0000000000000004 RBX: 0000000000000000 RCX: 0000000000000005
RDX: ffffffff8b4808ae RSI: ffffffff8f685d10 RDI: 0000000000000003
RBP: dffffc0000000000 R08: ffff888027695b80 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000002 R12: 0000000000000000
R13: 00007f0cd13f7fff R14: 0000000000000003 R15: ffff888031ce4000
 mas_state_walk lib/maple_tree.c:3298 [inline]
 mt_find+0x244/0x5e0 lib/maple_tree.c:6497
 find_vma+0xe7/0x160 mm/mmap.c:906
 lock_mm_and_find_vma+0x5f/0x300 mm/mmap_lock.c:453
 do_user_addr_fault+0x331/0x1380 arch/x86/mm/fault.c:1359
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:__put_user_nocheck_4+0x3/0x10 arch/x86/lib/putuser.S:104
Code: d9 0f 01 cb 89 01 31 c9 0f 01 ca e9 f2 fc c1 f5 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 01 cb <89> 01 31 c9 0f 01 ca e9 cc fc c1 f5 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000b88f8b8 EFLAGS: 00050202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000200000082030
RDX: ffff888027695b80 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc9000b88fa30 R08: ffffc9000b88f667 R09: 1ffff92001711ecc
R10: dffffc0000000000 R11: fffff52001711ecd R12: 0000000000000002
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000200000082000
 ____sys_recvmsg+0x2ab/0x460 net/socket.c:2825
 ___sys_recvmsg+0x1b5/0x510 net/socket.c:2854
 do_recvmmsg+0x307/0x770 net/socket.c:2949
 __sys_recvmmsg net/socket.c:3023 [inline]
 __do_sys_recvmmsg net/socket.c:3046 [inline]
 __se_sys_recvmmsg net/socket.c:3039 [inline]
 __x64_sys_recvmmsg+0x190/0x240 net/socket.c:3039
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0cd318f749
RSP: 002b:00007f0cd3f91038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f0cd33e6090 RCX: 00007f0cd318f749
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f0cd3213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0cd33e6128 R14: 00007f0cd33e6090 R15: 00007fffacac4b58
 </TASK>
rcu: rcu_preempt kthread starved for 10551 jiffies! g69017 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:27136 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x14bc/0x5000 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6960
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </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 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: ce 73 c1 f5 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 80 19 00 f3 0f 1e fa fb f4 <e9> a3 73 c1 f5 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 000002c6
RAX: 38c35a38cff4b200 RBX: ffffffff81974b6a RCX: 38c35a38cff4b200
RDX: 0000000000000001 RSI: ffffffff8d7831da RDI: ffffffff8bc00c60
RBP: ffffc90000197f10 R08: ffff8880b89336db R09: 1ffff110171266db
R10: dffffc0000000000 R11: ffffed10171266dc R12: ffffffff8f815070
R13: 1ffff11003956b70 R14: 0000000000000001 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888126184000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555825d05c8 CR3: 0000000059f47000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x1ea/0x520 kernel/sched/idle.c:332
 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:430
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x147
 </TASK>