rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=6afc/1/0x4000000000000000 softirq=5995/5996 fqs=1 rcu: (detected by 1, t=10506 jiffies, g=7205, q=58 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 55 Comm: kworker/0:2 Not tainted 6.7.0-rc4-next-20231208-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Workqueue: events linkwatch_event RIP: 0010:kasan_check_range+0x154/0x190 mm/kasan/generic.c:189 Code: 74 11 80 38 00 74 ef 4d 8d 1c 2c 48 85 c0 48 89 c2 75 97 48 89 da 4c 89 d8 4c 29 da e9 30 ff ff ff 5b b8 01 00 00 00 5d 41 5c b8 01 00 00 00 c3 48 29 c3 48 89 da 49 89 d3 49 c1 fb 3f 49 c1 RSP: 0018:ffffc9000130fbf8 EFLAGS: 00000046 RAX: 0000000000000001 RBX: ffff88801c4be000 RCX: ffffffff887d61aa RDX: ffffed1003897c2a RSI: 0000000000000008 RDI: ffff88801c4be148 RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffed1003897c29 R10: ffff88801c4be14f R11: 0000000000000003 R12: 00000000000000bd R13: ffff88801c4be148 R14: ffff88801c4be000 R15: ffff88801c4be6b0 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005579a23f7000 CR3: 000000006bda9000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] netif_running include/linux/netdevice.h:3698 [inline] linkwatch_urgent_event+0x2a/0x380 net/core/link_watch.c:107 __linkwatch_run_queue+0xd8/0x460 net/core/link_watch.c:224 linkwatch_event+0x8f/0xc0 net/core/link_watch.c:273 process_one_work+0x8a4/0x15f0 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x8b6/0x1290 kernel/workqueue.c:2787 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 rcu: rcu_preempt kthread starved for 10500 jiffies! g7205 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 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:27888 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5399 [inline] __schedule+0xf15/0x5c80 kernel/sched/core.c:6726 __schedule_loop kernel/sched/core.c:6801 [inline] schedule+0xe7/0x270 kernel/sched/core.c:6816 schedule_timeout+0x136/0x290 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:1631 rcu_gp_kthread+0x245/0x380 kernel/rcu/tree.c:1830 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 PID: 60 Comm: kworker/u4:4 Not tainted 6.7.0-rc4-next-20231208-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:311 [inline] RIP: 0010:smp_call_function_many_cond+0x4e9/0x1570 kernel/smp.c:855 Code: 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 7e c7 0b 00 f3 90 41 0f b6 04 24 <40> 38 c5 7c 08 84 c0 0f 85 44 0e 00 00 8b 43 08 31 ff 83 e0 01 41 RSP: 0018:ffffc900015b7920 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b9844240 RCX: ffffffff817c54e8 RDX: ffff88801b2f3b80 RSI: ffffffff817c54c2 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000006 R12: ffffed1017308849 R13: 0000000000000001 R14: ffff8880b9844248 R15: ffff8880b993d8c0 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbd9ef00040 CR3: 000000000cf78000 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:2007 [inline] text_poke_bp_batch+0x22b/0x750 arch/x86/kernel/alternative.c:2217 text_poke_flush arch/x86/kernel/alternative.c:2408 [inline] text_poke_flush arch/x86/kernel/alternative.c:2405 [inline] text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2415 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x1d7/0x400 kernel/jump_label.c:829 static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:205 static_key_enable+0x1a/0x20 kernel/jump_label.c:218 toggle_allocation_gate mm/kfence/core.c:826 [inline] toggle_allocation_gate+0xf4/0x250 mm/kfence/core.c:818 process_one_work+0x8a4/0x15f0 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x8b6/0x1290 kernel/workqueue.c:2787 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242