rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P20482/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=81933, q=66 ncpus=2)
task:syz-executor.5  state:R  running task     stack:24080 pid:20482 tgid:20479 ppid:5096   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0x1961/0x4ab0 kernel/sched/core.c:6688
 preempt_schedule_irq+0xfb/0x1b0 kernel/sched/core.c:7008
 irqentry_exit+0x5a/0x80 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:lock_acquire+0x25a/0x530 kernel/locking/lockdep.c:5758
Code: 2b 00 74 08 4c 89 f7 e8 d4 5a 7d 00 f6 44 24 61 02 0f 85 8a 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc90016626f40 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92002cc4df4 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8b6abf60 RDI: ffffffff8bbdf200
RBP: ffffc900166270a0 R08: ffffffff90dd4367 R09: 1ffffffff21ba86c
R10: dffffc0000000000 R11: fffffbfff21ba86d R12: 1ffff92002cc4df0
R13: dffffc0000000000 R14: ffffc90016626fa0 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 rcu_read_lock include/linux/rcupdate.h:747 [inline]
 percpu_ref_get_many+0x36/0x140 include/linux/percpu-refcount.h:202
 percpu_ref_get include/linux/percpu-refcount.h:222 [inline]
 css_get include/linux/cgroup_refcnt.h:11 [inline]
 mem_cgroup_commit_charge+0x9f/0x370 mm/memcontrol.c:2924
 charge_memcg+0xb1/0x160 mm/memcontrol.c:7214
 __mem_cgroup_charge+0x27/0x80 mm/memcontrol.c:7225
 mem_cgroup_charge include/linux/memcontrol.h:684 [inline]
 wp_page_copy mm/memory.c:3143 [inline]
 do_wp_page+0x1421/0x4d40 mm/memory.c:3510
 handle_pte_fault mm/memory.c:5054 [inline]
 __handle_mm_fault mm/memory.c:5179 [inline]
 handle_mm_fault+0x1b1c/0x6680 mm/memory.c:5344
 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline]
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x2ad/0x870 arch/x86/mm/fault.c:1561
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0010:rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:71
Code: 75 f1 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 <f3> a4 c3 48 89 c8 48 c1 e9 03 83 e0 07 f3 48 a5 89 c1 85 c9 75 b3
RSP: 0018:ffffc90016627978 EFLAGS: 00050206
RAX: ffff888010790001 RBX: 0000000020197e80 RCX: 0000000000000e80
RDX: 0000000000000000 RSI: ffff888010790180 RDI: 0000000020198000
RBP: ffffc90016627af8 R08: ffff888010790fff R09: 1ffff110020f21ff
R10: dffffc0000000000 R11: ffffed10020f2200 R12: 0000000000001000
R13: 0000000000001000 R14: ffffc90016627e30 R15: ffff888010790000
 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:133 [inline]
 copy_to_user_iter lib/iov_iter.c:25 [inline]
 iterate_iovec include/linux/iov_iter.h:51 [inline]
 iterate_and_advance2 include/linux/iov_iter.h:247 [inline]
 iterate_and_advance include/linux/iov_iter.h:271 [inline]
 _copy_to_iter+0x4a0/0x1cf0 lib/iov_iter.c:186
 copy_page_to_iter+0xb1/0x160 lib/iov_iter.c:381
 process_vm_rw_pages mm/process_vm_access.c:45 [inline]
 process_vm_rw_single_vec mm/process_vm_access.c:117 [inline]
 process_vm_rw_core mm/process_vm_access.c:215 [inline]
 process_vm_rw+0x86e/0xcf0 mm/process_vm_access.c:283
 __do_sys_process_vm_readv mm/process_vm_access.c:295 [inline]
 __se_sys_process_vm_readv mm/process_vm_access.c:291 [inline]
 __x64_sys_process_vm_readv+0xe0/0xf0 mm/process_vm_access.c:291
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f66bd07cae9
RSP: 002b:00007f66bdcfc0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000136
RAX: ffffffffffffffda RBX: 00007f66bd19bf80 RCX: 00007f66bd07cae9
RDX: 0000000000000002 RSI: 0000000020008400 RDI: 00000000000007fe
RBP: 00007f66bd0c847a R08: 0000000000000286 R09: 0000000000000000
R10: 0000000020008640 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f66bd19bf80 R15: 00007fffa002c098
 </TASK>
rcu: rcu_preempt kthread starved for 10522 jiffies! g81933 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:25400 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0x1961/0x4ab0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6778
 schedule_timeout+0x1bd/0x300 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x30a/0x1500 kernel/rcu/tree.c:1631
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1830
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 20497 Comm: syz-executor.1 Not tainted 6.7.0-rc3-syzkaller-00048-ge8f60209d6cf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:lock_release+0x71/0x9c0 kernel/locking/lockdep.c:5762
Code: 41 48 c7 44 24 68 fb 18 11 8d 48 c7 44 24 70 10 4b 6d 81 4c 8d 64 24 60 49 c1 ec 03 48 b8 f1 f1 f1 f1 04 f2 00 f2 4b 89 04 3c <48> b8 f2 f2 00 f3 f3 f3 f3 f3 4b 89 44 3c 08 0f 1f 44 00 00 65 8b
RSP: 0018:ffffc90003477940 EFLAGS: 00000a02
RAX: f200f204f1f1f1f1 RBX: 00007f9d187d1044 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff81d59485 RDI: ffff88802925a7a0
RBP: ffffc90003477a70 R08: ffffffff90dd4397 R09: 1ffffffff21ba872
R10: dffffc0000000000 R11: fffffbfff21ba873 R12: 1ffff9200068ef34
R13: ffffffff81d59485 R14: 00007f9d187d0d00 R15: dffffc0000000000
FS:  00007f9d187d16c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe742575198 CR3: 0000000014373000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 __copy_from_user include/linux/uaccess.h:97 [inline]
 check_xstate_in_sigframe arch/x86/kernel/fpu/signal.c:35 [inline]
 __fpu_restore_sig arch/x86/kernel/fpu/signal.c:348 [inline]
 fpu__restore_sig+0x1ab/0x1190 arch/x86/kernel/fpu/signal.c:496
 restore_sigcontext+0x67e/0x780 arch/x86/kernel/signal_64.c:95
 __do_sys_rt_sigreturn+0x17e/0x260 arch/x86/kernel/signal_64.c:263
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f9d17a7cae7
Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89
RSP: 002b:00007f9d187d10c8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00007f9d17b9bf80 RCX: 00007f9d17a7cae9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f9d17ac847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f9d17b9bf80 R15: 00007ffeb6aad068
 </TASK>
sched: RT throttling activated