rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: (detected by 0, t=10502 jiffies, g=199589, q=892 ncpus=1)
rcu: All QSes seen, last rcu_preempt kthread activity 2204 (4295159818-4295157614), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 2204 jiffies! g199589 f0x2 RCU_GP_CLEANUP(7) ->state=R ->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:27560 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7284
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7606
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x205/0xa10 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:cond_resched_tasks_rcu_qs include/linux/rcupdate.h:226 [inline]
RIP: 0010:rcu_gp_cleanup+0x28c/0xd40 kernel/rcu/tree.c:2246
Code: 1e b6 9c 12 85 c0 74 04 90 0f 0b 90 4c 89 ff e8 0a 2f e5 09 48 8b 44 24 28 48 8b 54 24 20 0f b6 00 83 e2 07 38 d0 7f 08 84 c0 <0f> 85 78 08 00 00 65 48 8b 05 ce 73 9c 12 0f b6 80 f0 04 00 00 84
RSP: 0018:ffffc90000167cd0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000040 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8e38f6ca RDI: 0000000000000001
RBP: ffffffff8edf7d88 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8edf7d80
R13: ffffffff91458f04 R14: dffffc0000000000 R15: ffffffff8edf7d40
rcu_gp_kthread+0x18b/0x220 kernel/rcu/tree.c:2334
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 23491 Comm: syz.5.5002 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:__sanitizer_cov_trace_pc+0x5b/0x70 kernel/kcov.c:218
Code: 00 00 f0 75 35 8b 82 44 17 00 00 85 c0 74 2b 8b 82 18 17 00 00 83 f8 02 75 20 48 8b 8a 20 17 00 00 8b 92 1c 17 00 00 48 8b 01 <48> 83 c0 01 48 39 d0 73 07 48 89 01 48 89 34 c1 c3 cc cc cc cc 90
RSP: 0018:ffffc900055cfc60 EFLAGS: 00000246
RAX: 000000000007ffff RBX: ffff888028fc0000 RCX: ffffc9001c9d3000
RDX: 0000000000080000 RSI: ffffffff8261d709 RDI: ffff888028fc0000
RBP: ffffffff8c6036e0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000000a9
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888028fc0000
FS: 00007f00acdf66c0(0000) GS:ffff888123b4e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000b000 CR3: 0000000034f45000 CR4: 00000000003526f0
Call Trace:
__might_fault+0x79/0x140 mm/memory.c:7480
_inline_copy_from_user include/linux/uaccess.h:169 [inline]
_copy_from_user+0x29/0xd0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:222 [inline]
restore_sigcontext+0xcd/0x6a0 arch/x86/kernel/signal_64.c:59
__do_sys_rt_sigreturn+0x229/0x2c0 arch/x86/kernel/signal_64.c:268
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f00aeb3f519
Code: 11 06 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 0c 25
RSP: 002b:00007f00acdf5400 EFLAGS: 00000206 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f00aee25fa8 RCX: 00007f00aeb3f519
RDX: 00007f00acdf5400 RSI: 00007f00acdf5530 RDI: 0000000000000021
RBP: 00007f00aee25fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f00aee26038 R14: 00007fff54297150 R15: 00007fff54297238