rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 GPs behind) idle=110c/1/0x4000000000000000 softirq=52592/52593 fqs=1 rcu: (detected by 0, t=10505 jiffies, g=81313, q=376 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 10639 Comm: syz.3.1067 Not tainted 6.10.0-syzkaller-12888-g5437f30d3458 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 RIP: 0010:instrument_atomic_read include/linux/instrumented.h:68 [inline] RIP: 0010:atomic64_read include/linux/atomic/atomic-instrumented.h:1610 [inline] RIP: 0010:taprio_set_budgets+0x130/0x310 net/sched/sch_taprio.c:670 Code: 10 48 8b 44 24 18 48 8d 78 20 48 89 f8 48 89 7c 24 20 48 c1 e8 03 48 89 44 24 28 e9 c1 00 00 00 e8 45 bf 69 f8 48 8b 7c 24 20 08 00 00 00 e8 f6 ed c6 f8 48 8b 44 24 28 42 80 3c 38 00 0f 85 RSP: 0018:ffffc90000a18d10 EFLAGS: 00000046 RAX: 0000000080010001 RBX: ffff88802c56bc84 RCX: ffffffff8920d173 RDX: ffff88802b973c00 RSI: ffffffff8920d06b RDI: ffff8880502e42e0 RBP: 0000000000000001 R08: 0000000000000006 R09: 0000000000000000 R10: 0000000004000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88802c56bc08 R14: 0000000004000000 R15: dffffc0000000000 FS: 00007f74d435d6c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe3052cf2d8 CR3: 0000000050e00000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: advance_sched+0x5e1/0xc60 net/sched/sch_taprio.c:977 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x20c/0xcc0 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:mutex_unlock+0x0/0x10 kernel/locking/mutex.c:543 Code: 0b fe ff ff 48 c7 c7 f4 e3 12 90 e8 aa 97 d4 f6 e9 50 fd ff ff 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 34 24 e9 93 f9 ff ff 0f 1f 00 90 90 90 90 90 90 RSP: 0018:ffffc90003557808 EFLAGS: 00000246 RAX: 0000000000040000 RBX: ffff8880229e5a00 RCX: ffffc9000e475000 RDX: 0000000000040000 RSI: ffffffff89b150f1 RDI: ffff88802b5e0d18 RBP: ffff88802b5e0800 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff88807cb7ce00 R15: ffff88802b5e0d18 __unix_dgram_recvmsg+0x829/0xe50 net/unix/af_unix.c:2528 unix_dgram_recvmsg+0xd0/0x110 net/unix/af_unix.c:2544 sock_recvmsg_nosec net/socket.c:1046 [inline] ____sys_recvmsg+0x5fe/0x6b0 net/socket.c:2814 ___sys_recvmsg+0x115/0x1a0 net/socket.c:2858 do_recvmmsg+0x2ba/0x750 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+0x239/0x290 net/socket.c:3047 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f74d3577299 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:00007f74d435d048 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007f74d3706058 RCX: 00007f74d3577299 RDX: 0000000000010106 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007f74d35e48e6 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f74d3706058 R15: 00007ffec9aefcc8 rcu: rcu_preempt kthread starved for 10500 jiffies! g81313 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:27608 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0xe37/0x5490 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6621 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2034 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2236 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 5775 Comm: kworker/u8:11 Not tainted 6.10.0-syzkaller-12888-g5437f30d3458 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:312 [inline] RIP: 0010:smp_call_function_many_cond+0x4e7/0x1420 kernel/smp.c:856 Code: 0c 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 f4 4c 89 f5 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 4b 39 0c 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 f7 0c 00 00 8b 43 08 31 RSP: 0018:ffffc90003567908 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b9344bc0 RCX: ffffffff817e568b RDX: ffff8880239d1e00 RSI: ffffffff817e5665 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffed1017268979 R13: 0000000000000001 R14: ffff8880b9344bc8 R15: ffff8880b9240000 FS: 0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0d980110be CR3: 000000000db7c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1023 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2085 [inline] text_poke_bp_batch+0x22b/0x760 arch/x86/kernel/alternative.c:2295 text_poke_flush arch/x86/kernel/alternative.c:2486 [inline] text_poke_flush arch/x86/kernel/alternative.c:2483 [inline] text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2493 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x1d7/0x400 kernel/jump_label.c:900 static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate mm/kfence/core.c:833 [inline] toggle_allocation_gate+0xf8/0x250 mm/kfence/core.c:825 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf20 kernel/workqueue.c:3390 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244