rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10810 jiffies, g=39069, q=673 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10810 (4294976782-4294965972), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10810 jiffies! g39069 f0x2 RCU_GP_WAIT_FQS(5) ->state=R ->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:27552 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5830 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x1230 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9c/0x340 kernel/rcu/tree.c:2330
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 10300 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:190 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4f/0x80 kernel/kcov.c:223
Code: 01 00 0f 81 fe 00 01 00 00 40 0f 95 c6 81 fa 00 00 00 10 0f 93 c2 40 08 f2 75 35 83 b9 44 17 00 00 00 74 2c 8b 91 18 17 00 00 <83> fa 02 75 21 48 8b 91 20 17 00 00 48 8b 32 48 8d 7e 01 8b 89 1c
RSP: 0018:ffffc9000326f2b8 EFLAGS: 00000246
RAX: ffffffff8226a197 RBX: 0000000000000000 RCX: ffff88802d0c8000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000326f550 R08: ffff88807b5a8423 R09: 1ffff1100f6b5084
R10: dffffc0000000000 R11: ffffed100f6b5085 R12: 00007feb323a4000
R13: 00007feb32400000 R14: 800000004bdab027 R15: dffffc0000000000
FS:  00005555669e4500(0000) GS:ffff888123513000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feb33a25f40 CR3: 0000000076c4a000 CR4: 00000000003526f0
DR0: 0000200000000b40 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 copy_pte_range mm/memory.c:1340 [inline]
 copy_pmd_range+0x8b7/0x5c00 mm/memory.c:1453
 copy_pud_range mm/memory.c:1490 [inline]
 copy_p4d_range mm/memory.c:1514 [inline]
 copy_page_range+0xcc2/0x12b0 mm/memory.c:1600
 dup_mmap+0xf70/0x1e10 mm/mmap.c:1819
 dup_mm kernel/fork.c:1542 [inline]
 copy_mm+0x115/0x470 kernel/fork.c:1594
 copy_process+0x1ecc/0x44b0 kernel/fork.c:2320
 kernel_clone+0x2d7/0x940 kernel/fork.c:2784
 __do_sys_clone kernel/fork.c:2926 [inline]
 __se_sys_clone kernel/fork.c:2910 [inline]
 __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2910
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feb337c7fd2
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffd2acd9270 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffd2acd9270 RCX: 00007feb337c7fd2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007feb33a267b8 R08: 0000000000000000 R09: 0000000000000000
R10: 00005555669e47d0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000003 R14: 00007ffd2acd95f8 R15: 0000000000000000
 </TASK>