rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (0 ticks this GP) idle=08bc/1/0x4000000000000000 softirq=64148/64148 fqs=0 rcu: (detected by 0, t=10502 jiffies, g=65029, q=286 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 11054 Comm: syz-executor Not tainted 6.13.0-rc5-syzkaller-00163-gab75170520d4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:kasan_check_range+0xc/0x290 mm/kasan/generic.c:188 Code: e3 ff 90 0f 0b 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 55 41 57 41 56 41 54 53 01 48 85 f6 0f 84 a0 01 00 00 4c 8d 04 37 49 39 f8 0f 82 56 02 RSP: 0018:ffffc90000a18b90 EFLAGS: 00000046 RAX: 48be96f6b87c0300 RBX: 0000000000000010 RCX: ffffffff84c8a8bc RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffffc90000a18c40 RBP: ffffc90000a18c40 R08: ffffffff818ceb32 R09: fffff52000143184 R10: dffffc0000000000 R11: fffff52000143184 R12: ffffc90000a18c40 R13: 1ffff92000143184 R14: 0000000000000000 R15: ffff88805e45c340 FS: 000055559126d500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555579bd9808 CR3: 000000006b588000 CR4: 0000000000350ef0 Call Trace: __asan_memset+0x23/0x50 mm/kasan/shadow.c:84 debug_object_activate+0x9c/0x580 lib/debugobjects.c:806 debug_hrtimer_activate kernel/time/hrtimer.c:428 [inline] debug_activate kernel/time/hrtimer.c:469 [inline] enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1076 __run_hrtimer kernel/time/hrtimer.c:1756 [inline] __hrtimer_run_queues+0x6cb/0xd30 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1865 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x112/0x420 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:preempt_schedule_irq+0xf6/0x1c0 kernel/sched/core.c:7078 Code: 89 f5 49 c1 ed 03 eb 0d 48 f7 03 08 00 00 00 0f 84 8b 00 00 00 bf 01 00 00 00 e8 55 a4 a3 f5 e8 a0 51 dd f5 fb bf 01 00 00 00 85 ab ff ff 43 80 7c 3d 00 00 74 08 4c 89 f7 e8 45 00 3c f6 48 RSP: 0018:ffffc900036af040 EFLAGS: 00000286 RAX: 48be96f6b87c0300 RBX: 1ffff920006d5e10 RCX: ffffffff817b378a RDX: dffffc0000000000 RSI: ffffffff8c0a98e0 RDI: 0000000000000001 RBP: ffffc900036af100 R08: ffffffff942a4a67 R09: 1ffffffff285494c R10: dffffc0000000000 R11: fffffbfff285494d R12: 1ffff920006d5e08 R13: 1ffff920006d5e0c R14: ffffc900036af060 R15: dffffc0000000000 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709 RIP: 0010:queue_work_on+0x269/0x380 kernel/workqueue.c:2395 Code: 75 19 e8 0a fc 37 00 eb 18 e8 03 fc 37 00 e8 9e 42 61 0a 48 83 7c 24 10 00 74 e7 e8 f1 fb 37 00 fb 48 c7 44 24 20 0e 36 e0 45 <4b> c7 04 37 00 00 00 00 43 c7 44 37 09 00 00 00 00 66 43 c7 44 37 RSP: 0018:ffffc900036af1c0 EFLAGS: 00000293 RAX: ffffffff8167882f RBX: 0000000000000000 RCX: ffff88802fe7da00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900036af2a8 R08: ffffffff816787ff R09: 1ffffffff285494c R10: dffffc0000000000 R11: fffffbfff285494d R12: 001fffffffc00001 R13: 0000000000000046 R14: 1ffff920006d5e3c R15: dffffc0000000000 nsim_fib_event_nb+0xe5d/0x10b0 drivers/net/netdevsim/fib.c:1043 call_fib_notifier+0x44/0x70 net/core/fib_notifier.c:24 call_fib_entry_notifier net/ipv4/fib_trie.c:90 [inline] fib_leaf_notify net/ipv4/fib_trie.c:2197 [inline] fib_table_notify net/ipv4/fib_trie.c:2215 [inline] fib_notify+0x445/0x780 net/ipv4/fib_trie.c:2238 fib_net_dump net/core/fib_notifier.c:69 [inline] register_fib_notifier+0x184/0x370 net/core/fib_notifier.c:107 nsim_fib_create+0x902/0xa70 drivers/net/netdevsim/fib.c:1596 nsim_drv_probe+0x747/0xb80 drivers/net/netdevsim/dev.c:1585 really_probe+0x2ba/0xad0 drivers/base/dd.c:658 __driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800 driver_probe_device+0x50/0x430 drivers/base/dd.c:830 __device_attach_driver+0x2d6/0x530 drivers/base/dd.c:958 bus_for_each_drv+0x250/0x2e0 drivers/base/bus.c:459 __device_attach+0x333/0x520 drivers/base/dd.c:1030 bus_probe_device+0x189/0x260 drivers/base/bus.c:534 device_add+0x856/0xbf0 drivers/base/core.c:3665 nsim_bus_dev_new drivers/net/netdevsim/bus.c:442 [inline] new_device_store+0x3f3/0x890 drivers/net/netdevsim/bus.c:173 kernfs_fop_write_iter+0x3a2/0x500 fs/kernfs/file.c:334 new_sync_write fs/read_write.c:586 [inline] vfs_write+0xaed/0xd30 fs/read_write.c:679 ksys_write+0x18f/0x2b0 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f60661847df Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48 RSP: 002b:00007ffd233dc220 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f60661847df RDX: 0000000000000003 RSI: 00007ffd233dc270 RDI: 0000000000000005 RBP: 00007f6066202d39 R08: 0000000000000000 R09: 00007ffd233dc077 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 00007ffd233dc270 R14: 00007f6066ea4620 R15: 0000000000000003 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g65029 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=27242 rcu: rcu_preempt kthread starved for 10502 jiffies! g65029 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:25976 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244