rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11457/3:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=53253, q=189 ncpus=2)
task:syz.3.2025      state:R  running task     stack:27016 pid:11457 ppid:5796   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6866
 preempt_schedule+0xab/0xc0 kernel/sched/core.c:6890
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3a/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 filemap_map_pages+0x1069/0x1630 mm/filemap.c:3655
 do_fault_around mm/memory.c:4573 [inline]
 do_read_fault mm/memory.c:4606 [inline]
 do_fault mm/memory.c:4753 [inline]
 do_pte_missing mm/memory.c:3688 [inline]
 handle_pte_fault mm/memory.c:5025 [inline]
 __handle_mm_fault mm/memory.c:5166 [inline]
 handle_mm_fault+0x379b/0x4920 mm/memory.c:5331
 do_user_addr_fault+0xad0/0x12e0 arch/x86/mm/fault.c:1324
 handle_page_fault arch/x86/mm/fault.c:1465 [inline]
 exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7fa6e2e6f0cd
RSP: 002b:00007fff08e86930 EFLAGS: 00010202
RAX: 000000110c2f0000 RBX: 00007fa6e3d15720 RCX: 0000000000000002
RDX: 00000000000006d1 RSI: 0000000000003a9b RDI: 0000000000000004
RBP: ffffffff817ea6d1 R08: 00007fa6e31e6038 R09: 00007fa6e31d2000
R10: 00007fa6e29ff008 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff817eadf7 R15: 0000000000000138
 </TASK>
rcu: rcu_preempt kthread starved for 10523 jiffies! g53253 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:27272 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 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:
CPU: 1 PID: 11452 Comm: syz.2.2024 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:raw_spin_rq_unlock_irq+0x13/0x90 kernel/sched/sched.h:1385
Code: 0f 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 32 9a 10 09 66 90 41 57 41 56 53 66 90 e8 94 42 1a 09 e8 8f 2f 2e 00 fb 5b <41> 5e 41 5f c3 f3 0f 1e fa 49 be 00 00 00 00 00 fc ff df 49 89 ff
RSP: 0018:ffffc900039e78e8 EFLAGS: 00000282
RAX: 4b7c2e26b34ba200 RBX: ffff8880b8f3cf48 RCX: 4b7c2e26b34ba200
RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: ffffffff8afc63c0
RBP: ffffc900039e7ae8 R08: ffffffff8e4a836f R09: 1ffffffff1c9506d
R10: dffffc0000000000 R11: fffffbfff1c9506e R12: dffffc0000000000
R13: ffff8880b8f3c200 R14: ffff88802ce88000 R15: ffff88802ce88000
FS:  00007f1a50a1f6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa8471156c0 CR3: 000000007ba65000 CR4: 00000000003526e0
Call Trace:
 <TASK>
 __schedule+0x171e/0x44d0 kernel/sched/core.c:6703
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 futex_wait_queue+0x138/0x1b0 kernel/futex/waitwake.c:355
 futex_wait+0x19f/0x530 kernel/futex/waitwake.c:656
 do_futex+0x2ff/0x3e0 kernel/futex/syscalls.c:106
 __do_sys_futex kernel/futex/syscalls.c:183 [inline]
 __se_sys_futex+0x36f/0x3f0 kernel/futex/syscalls.c:164
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1a4fb8eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1a50a1f0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f1a4fde5fa8 RCX: 00007f1a4fb8eec9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1a4fde5fa8
RBP: 00007f1a4fde5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1a4fde6038 R14: 00007ffee6734c50 R15: 00007ffee6734d38
 </TASK>