rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P14088/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=50057, q=92 ncpus=2)
task:syz.1.2703      state:R  running task     stack:25552 pid:14088 tgid:14082 ppid:5830   task_flags:0x40054c flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0x190e/0x4c90 kernel/sched/core.c:6765
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6944
 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6968
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 zap_pte_range mm/memory.c:1772 [inline]
 zap_pmd_range mm/memory.c:1834 [inline]
 zap_pud_range mm/memory.c:1863 [inline]
 zap_p4d_range mm/memory.c:1884 [inline]
 unmap_page_range+0x3a0d/0x4510 mm/memory.c:1905
 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1995
 exit_mmap+0x283/0xd40 mm/mmap.c:1284
 __mmput+0x115/0x420 kernel/fork.c:1356
 exit_mm+0x220/0x310 kernel/exit.c:570
 do_exit+0x9ad/0x28e0 kernel/exit.c:925
 do_group_exit+0x207/0x2c0 kernel/exit.c:1087
 get_signal+0x168c/0x1720 kernel/signal.c:3036
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f260118d169
RSP: 002b:00007f26020560e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f26013a6088 RCX: 00007f260118d169
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f26013a6088
RBP: 00007f26013a6080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f26013a608c
R13: 0000000000000000 R14: 00007ffecf9a1550 R15: 00007ffecf9a1638
 </TASK>
rcu: rcu_preempt kthread starved for 10501 jiffies! g50057 f0x0 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:26104 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0x190e/0x4c90 kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6857
 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2024
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2226
 kthread+0x7ab/0x920 kernel/kthread.c:464
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </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: 14094 Comm: syz.0.2690 Not tainted 6.14.0-rc4-syzkaller-00242-g7a5668899f54 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:advance_sched+0x950/0xca0
Code: 26 37 bd f7 48 81 c3 00 01 00 00 48 89 df 48 c7 c6 20 6c 04 8a e8 80 b1 a2 f7 eb 05 e8 09 37 bd f7 48 8b 44 24 20 48 89 04 24 <49> 8d 5f 80 48 8b 7c 24 18 48 83 c7 10 48 89 f8 48 c1 e8 03 42 80
RSP: 0018:ffffc90000007c70 EFLAGS: 00000006
RAX: ffffffff8a0486de RBX: 182e2fb77c000000 RCX: ffff88802979bc00
RDX: 0000000000010000 RSI: 0000000004000000 RDI: 0000000000000000
RBP: ffff8880128368c8 R08: ffffffff8a048453 R09: fffff52000000f7c
R10: dffffc0000000000 R11: fffff52000000f7c R12: dffffc0000000000
R13: ffff888012836808 R14: ffff888012836800 R15: ffff888035917340
FS:  00007fad44f296c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d316ff8 CR3: 000000003ad20000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1801 [inline]
 __hrtimer_run_queues+0x59d/0xd30 kernel/time/hrtimer.c:1865
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1927
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x112/0x420 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__skb_try_recv_datagram+0x194/0x6a0 net/core/datagram.c:263
Code: 08 48 89 44 24 58 49 c1 ef 03 4c 89 7c 24 38 4c 89 e8 4c 89 6c 24 20 49 c1 ed 03 4c 89 6c 24 68 4c 8b 74 24 28 4c 8b 6c 24 70 <4c> 89 ef e8 54 b3 44 02 48 89 c3 48 8b 74 24 40 8b 54 24 04 48 8b
RSP: 0018:ffffc9000f287600 EFLAGS: 00000212
RAX: ffff88802b1732e8 RBX: ffff88802b173180 RCX: ffffffff89c22a70
RDX: ffff88802979bc00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000f287710 R08: ffffffff89c66e1f R09: ffffc9000f287800
R10: dffffc0000000000 R11: fffffbfff2079def R12: dffffc0000000000
R13: ffff88802b173280 R14: ffffc9000f287800 R15: 1ffff92001e50ed4
 __unix_dgram_recvmsg+0x3c3/0x1320 net/unix/af_unix.c:2430
 sock_recvmsg_nosec+0x190/0x1d0 net/socket.c:1023
 ____sys_recvmsg+0x3cd/0x480 net/socket.c:2791
 ___sys_recvmsg net/socket.c:2835 [inline]
 do_recvmmsg+0x426/0xab0 net/socket.c:2930
 __sys_recvmmsg net/socket.c:3004 [inline]
 __do_sys_recvmmsg net/socket.c:3027 [inline]
 __se_sys_recvmmsg net/socket.c:3020 [inline]
 __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3020
 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: 0033:0x7fad4418d169
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:00007fad44f29038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fad443a6080 RCX: 00007fad4418d169
RDX: 0000000000010106 RSI: 00004000000000c0 RDI: 0000000000000006
RBP: 00007fad4420e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fad443a6080 R15: 00007fff13496018
 </TASK>