rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P18736/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=107361, q=252 ncpus=2)
task:syz.2.3613      state:R  running task     stack:22968 pid:18736 tgid:18733 ppid:17506  flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5763
Code: 2b 00 74 08 4c 89 f7 e8 fa d6 87 00 f6 44 24 61 02 0f 85 85 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: 0000:ffffc9000e3cf340 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92001c79e74 RCX: 988aee897bfc4000
RDX: dffffc0000000000 RSI: ffffffff8beae6e0 RDI: ffffffff8c3f9980
RBP: ffffc9000e3cf488 R08: ffffffff934f4847 R09: 1ffffffff269e908
R10: dffffc0000000000 R11: fffffbfff269e909 R12: 1ffff92001c79e70
R13: dffffc0000000000 R14: ffffc9000e3cf3a0 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
 rcu_read_lock include/linux/rcupdate.h:838 [inline]
 count_memcg_event_mm+0xb1/0x420 include/linux/memcontrol.h:1017
 mm_account_fault mm/memory.c:5698 [inline]
 handle_mm_fault+0x149a/0x1880 mm/memory.c:5858
 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:__put_user_nocheck_4+0x7/0x20 arch/x86/lib/putuser.S:97
Code: d9 0f 01 cb 89 01 31 c9 0f 01 ca c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 01 cb <89> 01 31 c9 0f 01 ca c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00
RSP: 0000:ffffc9000e3cf8f8 EFLAGS: 00050202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000020108030
RDX: ffff88802a1bda00 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc9000e3cfa70 R08: ffffffff8971c733 R09: 1ffff92001c79ed0
R10: dffffc0000000000 R11: fffff52001c79ed1 R12: dffffc0000000000
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000020108000
 ____sys_recvmsg+0x2b9/0x470 net/socket.c:2829
 ___sys_recvmsg net/socket.c:2858 [inline]
 do_recvmmsg+0x474/0xae0 net/socket.c:2952
 __sys_recvmmsg net/socket.c:3031 [inline]
 __do_sys_recvmmsg net/socket.c:3054 [inline]
 __se_sys_recvmmsg net/socket.c:3047 [inline]
 __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3047
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6a6b579e79
RSP: 002b:00007f6a6c3db038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f6a6b716058 RCX: 00007f6a6b579e79
RDX: 0000000000010106 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00007f6a6b5e7916 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f6a6b716058 R15: 00007ffeb6de8068
 </TASK>