rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=11241, q=1646 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10501 (4294958775-4294948274), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g11241 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:27728 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5258 [inline]
 __schedule+0x150e/0x5070 kernel/sched/core.c:6866
 __schedule_loop kernel/sched/core.c:6948 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6963
 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6046 Comm: syz-executor636 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:local_lock_release include/linux/local_lock_internal.h:55 [inline]
RIP: 0010:mlock_drain_local+0x415/0x480 mm/mlock.c:220
Code: e8 f0 35 17 00 e9 81 fd ff ff e8 f6 8d b0 ff 48 c7 c7 c0 3b 44 8e 4c 89 f6 e8 67 a1 c0 02 e9 b1 fd ff ff 48 c7 c1 20 94 cf 99 <80> e1 07 80 c1 03 38 c1 0f 8c dc fd ff ff 48 c7 c7 20 94 cf 99 e8
RSP: 0000:ffffc9000493dbc8 EFLAGS: 00000202
RAX: 0000000000000004 RBX: ffffffff821166e9 RCX: ffffffff99cf9420
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 0000000000000000 R08: ffffffff821166e9 R09: ffff8880b86345e0
R10: ffffc9000493ddb0 R11: fffff52000927bbe R12: dffffc0000000000
R13: ffff888025061e80 R14: ffff8880b86345e0 R15: ffffffff8dccddd0
FS:  0000000000000000(0000) GS:ffff8881259dc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff4ee48ff8 CR3: 000000002ebb6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 lru_gen_shrink_lruvec mm/vmscan.c:5017 [inline]
 shrink_lruvec+0x215/0x2980 mm/vmscan.c:5784
 shrink_node_memcgs mm/vmscan.c:6020 [inline]
 shrink_node+0xaa9/0x35b0 mm/vmscan.c:6061
 shrink_zones mm/vmscan.c:6300 [inline]
 do_try_to_free_pages+0x668/0x1960 mm/vmscan.c:6362
 try_to_free_mem_cgroup_pages+0x2ea/0x7a0 mm/vmscan.c:6690
 try_charge_memcg+0xa2d/0x1280 mm/memcontrol.c:2388
 try_charge mm/memcontrol.c:2530 [inline]
 charge_memcg+0x9f/0x180 mm/memcontrol.c:4728
 __mem_cgroup_charge+0x25/0x80 mm/memcontrol.c:4745
 mem_cgroup_charge include/linux/memcontrol.h:663 [inline]
 shmem_alloc_and_add_folio+0x790/0xf40 mm/shmem.c:1954
 shmem_get_folio_gfp+0x59d/0x1660 mm/shmem.c:2568
 shmem_get_folio mm/shmem.c:2674 [inline]
 shmem_write_begin+0x16c/0x330 mm/shmem.c:3327
 generic_perform_write+0x2c5/0x900 mm/filemap.c:4314
 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3502
 __kernel_write_iter+0x428/0x910 fs/read_write.c:619
 dump_emit_page fs/coredump.c:1298 [inline]
 dump_user_range+0x8a0/0xc90 fs/coredump.c:1372
 elf_core_dump+0x3369/0x3960 fs/binfmt_elf.c:2111
 coredump_write+0x1121/0x18b0 fs/coredump.c:1049
 do_coredump fs/coredump.c:1126 [inline]
 vfs_coredump+0x3321/0x3e60 fs/coredump.c:1200
 get_signal+0x1108/0x1340 kernel/signal.c:3019
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:75 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
 irqentry_exit+0x177/0x660 kernel/entry/common.c:196
 exc_page_fault+0xab/0x100 arch/x86/mm/fault.c:1535
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f0a29c9b144
Code: 00 e9 42 ff ff ff 41 89 45 00 e9 48 ff ff ff bf 01 00 00 00 e8 2d ba 00 00 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 83 ec 08 <64> 8b 04 25 ac ff ff ff 85 c0 75 40 48 8b 46 10 64 8b 14 25 a8 ff
RSP: 002b:00007fff4ee495b0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f0a29cdcd09
RDX: 00007fff4ee495c0 RSI: 00007fff4ee496f0 RDI: 000000000000000b
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007fff4ef47790 R14: 00007fff4ef477d0 R15: 0000000000000000
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.909 msecs