rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6676/3:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=18805, q=611 ncpus=2)
task:rm              state:R  running task     stack:24232 pid:6676  ppid:6650   flags:0x00004002
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: 0033:0x7f774fe43300
RSP: 002b:00007ffe701b4f28 EFLAGS: 00010206
RAX: 0000000000800000 RBX: 00007ffe701b4f38 RCX: 0000000000001180
RDX: 00007f774fea7cb0 RSI: 00007ffe701b4f38 RDI: 0000000000000022
RBP: 00007ffe701b5220 R08: 0000000000000040 R09: 000000000000000e
R10: 00007ffe701b4f50 R11: 0000000000000246 R12: fffffffffffffff8
R13: 00000051657a287b R14: 0000000000000000 R15: 00007f77500f5310
 </TASK>
rcu: rcu_preempt kthread starved for 10522 jiffies! g18805 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:27688 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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6682 Comm: syz.3.31 Not tainted 6.6.102-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:lock_release+0x11/0x8b0 kernel/locking/lockdep.c:5762
Code: e9 0e fa ff ff bb 2f 00 00 00 e9 24 fa ff ff 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 <48> 83 e4 e0 48 81 ec e0 00 00 00 49 89 f4 48 89 7c 24 18 65 48 8b
RSP: 0018:ffffc90003337c60 EFLAGS: 00000086
RAX: ffffffff81540079 RBX: ffff88805f74e5c0 RCX: ffff888021700000
RDX: 0000000000000000 RSI: ffffffff81540285 RDI: ffff88805f74e5d8
RBP: ffffc90003337c88 R08: 00007f091584d9b0 R09: 0000000004000000
R10: 00007f091592add0 R11: 0000000000000000 R12: 1ffff1100bee9d0b
R13: 0000000000000011 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f09167a16c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000030860000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:157 [inline]
 _raw_spin_unlock_irq+0x16/0x50 kernel/locking/spinlock.c:202
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x11f5/0x1400 kernel/signal.c:2905
 arch_do_signal_or_restart+0x96/0x780 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f091598ebe9
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:00007f09167a10e8 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 00007f0915bb5fa8 RCX: 00007f091598ebe9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f0915bb5fac
RBP: 00007f0915bb5fa0 R08: 0000000000745d1e R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0915bb6038 R14: 00007ffeb579fc60 R15: 00007ffeb579fd48
 </TASK>