rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (0 ticks this GP) idle=0da4/1/0x4000000000000000 softirq=89743/89743 fqs=0 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P19405 P19488/1:b..l rcu: (detected by 1, t=10502 jiffies, g=129269, q=251 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 19405 Comm: syz-executor.1 Not tainted 6.9.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 RIP: 0010:__sanitizer_cov_trace_cmp8+0x0/0x90 kernel/kcov.c:283 Code: 10 48 89 74 0a 18 4c 89 44 0a 20 c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 4c 8b 04 24 65 48 8b 0c 25 80 d3 03 00 65 8b 05 80 c9 RSP: 0018:ffffc90000007d20 EFLAGS: 00000046 RAX: ffffffff8b70a763 RBX: 0000000000000001 RCX: ffff88802d468000 RDX: 0000000000010404 RSI: ffff888069e1d340 RDI: 0000000000000001 RBP: dffffc0000000000 R08: ffffffff8183883c R09: 1ffffffff1f4f99d R10: dffffc0000000000 R11: fffffbfff1f4f99e R12: 1ffff1100d3c3a68 R13: ffff888069e1d340 R14: ffff8880b942c9d0 R15: ffff8880b942c880 FS: 0000555583f9e480(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200029c0 CR3: 000000001cf16000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: timerqueue_del+0x48/0x100 lib/timerqueue.c:55 __remove_hrtimer kernel/time/hrtimer.c:1123 [inline] __run_hrtimer kernel/time/hrtimer.c:1672 [inline] __hrtimer_run_queues+0x3da/0xd50 kernel/time/hrtimer.c:1756 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1818 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 5e 0b 75 f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 03 56 e3 f5 65 8b 05 54 7a 81 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc900051b6f40 EFLAGS: 00000206 RAX: 1cadf919e21c0000 RBX: 1ffff92000a36dec RCX: ffffffff8172f68a RDX: dffffc0000000000 RSI: ffffffff8bcab860 RDI: 0000000000000001 RBP: ffffc900051b6fd0 R08: ffffffff92efe5bf R09: 1ffffffff25dfcb7 R10: dffffc0000000000 R11: fffffbfff25dfcb8 R12: dffffc0000000000 R13: 1ffff92000a36de8 R14: ffffc900051b6f60 R15: 0000000000000246 __mod_timer+0xb89/0xeb0 kernel/time/timer.c:1187 sctp_addr_wq_mgmt+0x482/0x720 net/sctp/protocol.c:770 sctp_inet6addr_event+0x594/0x730 net/sctp/ipv6.c:106 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93 atomic_notifier_call_chain+0xdb/0x180 kernel/notifier.c:231 addrconf_ifdown+0xef7/0x1bc0 net/ipv6/addrconf.c:3979 addrconf_notify+0x3cb/0x1020 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:1988 [inline] call_netdevice_notifiers net/core/dev.c:2002 [inline] dev_close_many+0x33c/0x4c0 net/core/dev.c:1543 unregister_netdevice_many_notify+0x544/0x16e0 net/core/dev.c:11080 unregister_netdevice_many net/core/dev.c:11163 [inline] unregister_netdevice_queue+0x303/0x370 net/core/dev.c:11042 unregister_netdevice include/linux/netdevice.h:3115 [inline] nsim_destroy+0x13a/0x260 drivers/net/netdevsim/netdev.c:456 __nsim_dev_port_del+0x14b/0x1b0 drivers/net/netdevsim/dev.c:1425 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1437 [inline] nsim_dev_reload_destroy+0x28a/0x490 drivers/net/netdevsim/dev.c:1658 nsim_drv_remove+0x58/0x160 drivers/net/netdevsim/dev.c:1673 device_remove drivers/base/dd.c:566 [inline] __device_release_driver drivers/base/dd.c:1270 [inline] device_release_driver_internal+0x4a9/0x7c0 drivers/base/dd.c:1293 bus_remove_device+0x34f/0x420 drivers/base/bus.c:574 device_del+0x57a/0x9e0 drivers/base/core.c:3909 device_unregister+0x20/0xc0 drivers/base/core.c:3950 nsim_bus_dev_del drivers/net/netdevsim/bus.c:462 [inline] del_device_store+0x363/0x480 drivers/net/netdevsim/bus.c:226 kernfs_fop_write_iter+0x3a1/0x500 fs/kernfs/file.c:334 call_write_iter include/linux/fs.h:2110 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa84/0xcb0 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7faaf0e7caaf Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 b9 80 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 0c 81 02 00 48 RSP: 002b:00007ffcccb33c70 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007faaf0e7caaf RDX: 0000000000000001 RSI: 00007ffcccb33cc0 RDI: 0000000000000005 RBP: 00007faaf0eca043 R08: 0000000000000000 R09: 00007ffcccb33ac7 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 00007ffcccb33cc0 R14: 00007faaf1ad4620 R15: 0000000000000003 task:syz-executor.0 state:R running task stack:27064 pid:19488 tgid:19487 ppid:18956 flags:0x00000002 Call Trace: context_switch kernel/sched/core.c:5409 [inline] __schedule+0x1796/0x4a00 kernel/sched/core.c:6746 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7068 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:67 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:103 [inline] RIP: 0010:lock_is_held_type+0x67/0x190 kernel/locking/lockdep.c:5821 Code: f1 00 00 00 65 4c 8b 2c 25 80 d3 03 00 41 83 bd d4 0a 00 00 00 0f 85 da 00 00 00 41 89 f6 49 89 ff 48 c7 04 24 00 00 00 00 9c <8f> 04 24 4c 8b 24 24 fa 48 c7 c7 40 c5 ca 8b e8 55 1b 00 00 65 ff RSP: 0000:ffffc90009967d30 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 00000000ffffffff RCX: 0000000080000000 RDX: ffffc9000a249000 RSI: 00000000ffffffff RDI: ffffffff8e362478 RBP: ffffc90009967e70 R08: ffffffff81dfc269 R09: 1ffffffff25dfca0 R10: dffffc0000000000 R11: fffffbfff25dfca1 R12: ffff888028c28000 R13: ffff888025ac0000 R14: 00000000ffffffff R15: ffffffff8e362478 lock_is_held include/linux/lockdep.h:231 [inline] task_css include/linux/cgroup.h:434 [inline] mem_cgroup_from_task+0x77/0x120 mm/memcontrol.c:1056 count_memcg_event_mm+0x195/0x420 include/linux/memcontrol.h:1119 mm_account_fault mm/memory.c:5475 [inline] handle_mm_fault+0x3d5/0x770 mm/memory.c:5622 do_user_addr_fault arch/x86/mm/fault.c:1331 [inline] handle_page_fault arch/x86/mm/fault.c:1474 [inline] exc_page_fault+0x446/0x8a0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f6c1c629786 RSP: 002b:00007f6c1d44a530 EFLAGS: 00010206 RAX: 000000000023a001 RBX: 00007f6c1d44a5d0 RCX: 000000000000000a RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007f6c1d44a670 RBP: 0000000000000102 R08: 00007f6c12400000 R09: 000000000023a000 R10: 0000000000000000 R11: 00007f6c1d44a5e0 R12: 0000000000000001 R13: 00007f6c1c6ecfe0 R14: 0000000000000000 R15: 00007f6c1d44a670 task:syz-executor.1 state:R running task stack:20984 pid:19405 tgid:19405 ppid:19394 flags:0x0000400a Call Trace: rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g129269 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=56477 rcu: rcu_preempt kthread starved for 10502 jiffies! g129269 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26256 pid:16 tgid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5409 [inline] __schedule+0x1796/0x4a00 kernel/sched/core.c:6746 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6838 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2582 rcu_gp_fqs_loop+0x2df/0x1370 kernel/rcu/tree.c:1663 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1862 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244