rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 GPs behind) idle=006c/1/0x4000000000000000 softirq=142911/142912 fqs=56 rcu: (detected by 0, t=10504 jiffies, g=204425, q=116 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 7766 Comm: syz-executor.3 Not tainted 6.3.0-syzkaller-12378-gc8c655c34e33 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 RIP: 0010:advance_sched+0x149/0xd20 net/sched/sch_taprio.c:932 Code: 9d bb cf 01 31 ff 41 89 c4 89 c6 e8 21 09 45 f9 45 85 e4 0f 85 b2 06 00 00 e8 f3 0c 45 f9 48 8d 43 f0 48 89 c2 48 89 44 24 50 <48> b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 02 0b RSP: 0018:ffffc900003e8d90 EFLAGS: 00000046 RAX: ffff8880251b8330 RBX: ffff8880251b8340 RCX: 0000000000000000 RDX: ffff8880251b8330 RSI: ffffffff883e71cd RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001 R13: ffff8880b992b940 R14: ffff8880b992b840 R15: ffffffff883e7090 FS: 00007f7803582700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7803582718 CR3: 000000002ef59000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x5fa/0xbe0 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x320/0x7b0 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x14a/0x430 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x92/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x3c/0x70 kernel/locking/spinlock.c:194 Code: 74 24 10 e8 e6 74 53 f7 48 89 ef e8 0e e3 53 f7 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 cf b6 45 f7 65 8b 05 20 16 f2 75 85 c0 74 0a 5b 5d c3 e8 8c 75 RSP: 0018:ffffc900038d7a60 EFLAGS: 00000206 RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff1cf30c1 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffff888079af9088 R08: 0000000000000001 R09: 0000000000000001 R10: fffffbfff1cf36ca R11: 0000000000000000 R12: dffffc0000000000 R13: 1937fd84b21fb5b1 R14: 175b2734b21fb5b1 R15: ffff888079af9088 spin_unlock_irqrestore include/linux/spinlock.h:405 [inline] timerfd_clock_was_set+0x166/0x310 fs/timerfd.c:113 clock_was_set+0x1b1/0x810 kernel/time/hrtimer.c:980 timekeeping_inject_offset+0x4b4/0x620 kernel/time/timekeeping.c:1395 do_adjtimex+0x333/0xa40 kernel/time/timekeeping.c:2444 do_clock_adjtime kernel/time/posix-timers.c:1122 [inline] __do_sys_clock_adjtime+0x163/0x270 kernel/time/posix-timers.c:1134 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f780288c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7803582168 EFLAGS: 00000246 ORIG_RAX: 0000000000000131 RAX: ffffffffffffffda RBX: 00007f78029ac050 RCX: 00007f780288c169 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00007f78028e7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdb578bdbf R14: 00007f7803582300 R15: 0000000000022000 rcu: rcu_preempt kthread starved for 10220 jiffies! g204425 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:28208 pid:15 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5343 [inline] __schedule+0xc9a/0x5880 kernel/sched/core.c:6669 schedule+0xde/0x1a0 kernel/sched/core.c:6745 schedule_timeout+0x14e/0x2b0 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1609 rcu_gp_kthread+0x23a/0x360 kernel/rcu/tree.c:1808 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 PID: 1925 Comm: kworker/0:3 Not tainted 6.3.0-syzkaller-12378-gc8c655c34e33 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Workqueue: events bpf_prog_free_deferred RIP: 0010:csd_lock_wait kernel/smp.c:285 [inline] RIP: 0010:smp_call_function_many_cond+0x67f/0x15a0 kernel/smp.c:828 Code: 89 ee e8 04 3f 0b 00 85 ed 74 48 48 8b 44 24 08 49 89 c4 83 e0 07 49 c1 ec 03 48 89 c5 4d 01 f4 83 c5 03 e8 c3 42 0b 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 ad 0c 00 00 8b 43 08 31 RSP: 0018:ffffc90003e47948 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b9941a60 RCX: 0000000000000000 RDX: ffff88804e954080 RSI: ffffffff81783bfd RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffed101732834d R13: 0000000000000001 R14: dffffc0000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555557151848 CR3: 000000007a1d5000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x5a/0xa0 kernel/smp.c:996 __purge_vmap_area_lazy+0x207/0x1e60 mm/vmalloc.c:1750 _vm_unmap_aliases.part.0+0x78/0x550 mm/vmalloc.c:2262 _vm_unmap_aliases mm/vmalloc.c:2236 [inline] vm_reset_perms mm/vmalloc.c:2709 [inline] vfree+0x565/0x7e0 mm/vmalloc.c:2788 bpf_prog_unlock_free include/linux/filter.h:891 [inline] bpf_jit_free include/linux/filter.h:1180 [inline] bpf_prog_free_deferred+0x544/0x730 kernel/bpf/core.c:2590 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308