rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P9021/1:b..l
	(detected by 0, t=10502 jiffies, g=19265, q=30 ncpus=2)
task:syz.2.1050      state:R  running task     stack:0     pid:9021  ppid:4331   flags:0x00000009
Call trace:
 __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0xdd0/0x1b0c kernel/sched/core.c:6562
 preempt_schedule_irq+0x8c/0x1ac kernel/sched/core.c:6874
 arm64_preempt_schedule_irq+0x44/0x54 arch/arm64/kernel/entry-common.c:265
 __el1_irq arch/arm64/kernel/entry-common.c:474 [inline]
 el1_interrupt+0x3c/0x54 arch/arm64/kernel/entry-common.c:486
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491
 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:581
 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline]
 lock_acquire+0x24c/0x63c kernel/locking/lockdep.c:5665
 rcu_lock_acquire+0x40/0x4c include/linux/rcupdate.h:350
 rcu_read_lock include/linux/rcupdate.h:791 [inline]
 sk_filter_trim_cap+0x1c0/0x8f8 net/core/filter.c:149
 sk_filter include/linux/filter.h:905 [inline]
 unix_dgram_sendmsg+0x740/0x1268 net/unix/af_unix.c:1979
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5c8/0x938 net/socket.c:2518
 ___sys_sendmsg net/socket.c:2572 [inline]
 __sys_sendmmsg+0x344/0x834 net/socket.c:2658
 __do_sys_sendmmsg net/socket.c:2687 [inline]
 __se_sys_sendmmsg net/socket.c:2684 [inline]
 __arm64_sys_sendmmsg+0xa0/0xbc net/socket.c:2684
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g19265 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=17334
rcu: rcu_preempt kthread starved for 10500 jiffies! g19265 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:0     pid:16    ppid:2      flags:0x00000008
Call trace:
 __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0xdd0/0x1b0c kernel/sched/core.c:6562
 schedule+0xc4/0x170 kernel/sched/core.c:6638
 schedule_timeout+0x194/0x2f4 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x2b4/0x1378 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xb4/0x2fc kernel/rcu/tree.c:1905
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 9036 Comm: syz.4.1054 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : arch_local_irq_restore+0x8/0x10 arch/arm64/include/asm/irqflags.h:131
lr : lock_is_held_type+0x140/0x198 kernel/locking/lockdep.c:5707
sp : ffff800021117aa0
x29: ffff800021117aa0 x28: 0000000000000000 x27: 0000000000000001
x26: ffff0000cc3f8000 x25: ffff800015165d00 x24: 0000ffffa5813aa0
x23: ffff0000cc3f8000 x22: dfff800000000000 x21: ffff8000153e7380
x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082d7ca0 x15: ffff0000cc3f96e0
x14: 0000ffffa5814af0 x13: 1ffff00002a42071 x12: 0000000000080000
x11: 000000000007ffff x10: ffff80002c228000 x9 : ffff80000a8db9f0
x8 : 00000000000000c0 x7 : ffff8000087e13e4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000000 x1 : ffff800011b8ebc0 x0 : 0000000000000000
Call trace:
 arch_local_irq_restore+0x8/0x10 arch/arm64/include/asm/irqflags.h:122
 lock_is_held include/linux/lockdep.h:283 [inline]
 __might_resched+0x98/0x4cc kernel/sched/core.c:9931
 __might_sleep+0x94/0x110 kernel/sched/core.c:9898
 __might_fault+0x7c/0x124 mm/memory.c:5848
 preserve_fpsimd_context arch/arm64/kernel/signal.c:184 [inline]
 setup_sigframe arch/arm64/kernel/signal.c:818 [inline]
 setup_rt_frame arch/arm64/kernel/signal.c:994 [inline]
 handle_signal arch/arm64/kernel/signal.c:1035 [inline]
 do_signal arch/arm64/kernel/signal.c:1110 [inline]
 do_notify_resume+0x134c/0x2aa4 arch/arm64/kernel/signal.c:1148
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585