rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (9332 ticks this GP) idle=686/1/0x4000000000000000 softirq=12582/12583 fqs=5017 (t=10500 jiffies g=10909 q=3055) NMI backtrace for cpu 1 CPU: 1 PID: 10104 Comm: syz-executor.3 Not tainted 5.10.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x1e3/0x21e kernel/rcu/tree_stall.h:331 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline] check_cpu_stall kernel/rcu/tree_stall.h:637 [inline] rcu_pending kernel/rcu/tree.c:3694 [inline] rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567 update_process_times+0x77/0xd0 kernel/time/timer.c:1709 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline] sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:queue_work_on+0x83/0xd0 kernel/workqueue.c:1527 Code: 31 ff 89 ee e8 be 46 28 00 40 84 ed 74 46 e8 a4 4e 28 00 31 ff 48 89 de e8 0a 47 28 00 48 85 db 75 26 e8 90 4e 28 00 41 56 9d <48> 83 c4 08 44 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 76 4e 28 RSP: 0018:ffffc90000d908a0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000200 RCX: ffffffff8155a937 RDX: ffff888067e3cec0 RSI: ffffffff8147b5f0 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8ebaf747 R10: fffffbfff1d75ee8 R11: 0000000000000001 R12: ffff88802a8c15f0 R13: ffff888026261800 R14: 0000000000000246 R15: 0000000000000001 queue_work include/linux/workqueue.h:507 [inline] ieee80211_queue_work net/mac80211/util.c:931 [inline] ieee80211_queue_work+0x129/0x160 net/mac80211/util.c:924 ieee80211_rx_h_mgmt net/mac80211/rx.c:3638 [inline] ieee80211_rx_handlers+0x3b86/0xae50 net/mac80211/rx.c:3804 ieee80211_invoke_rx_handlers net/mac80211/rx.c:3834 [inline] ieee80211_prepare_and_rx_handle+0x2482/0x6360 net/mac80211/rx.c:4518 __ieee80211_rx_handle_packet net/mac80211/rx.c:4579 [inline] ieee80211_rx_list+0xdf3/0x23d0 net/mac80211/rx.c:4759 ieee80211_rx_napi+0xf7/0x3d0 net/mac80211/rx.c:4780 ieee80211_rx include/net/mac80211.h:4502 [inline] ieee80211_tasklet_handler+0xd3/0x130 net/mac80211/main.c:235 tasklet_action_common.constprop.0+0x22f/0x2d0 kernel/softirq.c:560 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x132/0x200 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x25/0x50 kernel/locking/spinlock.c:191 Code: f8 5d c3 66 90 55 48 89 fd 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 fa 3a 6e f8 48 89 ef e8 82 ef 6e f8 f6 c7 02 75 1a 53 9d 01 00 00 00 e8 91 5b 63 f8 65 8b 05 9a 05 1a 77 85 c0 74 0a 5b RSP: 0018:ffffc90001dbf300 EFLAGS: 00000216 RAX: 0000000000c06501 RBX: 0000000000000216 RCX: ffffffff8155a937 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffffffff8f0c3048 R08: 0000000000000001 R09: ffffffff8ebaf67f R10: fffffbfff1d75ecf R11: 0000000000000000 R12: ffff88806807e288 R13: dffffc0000000000 R14: 1ffff920003b7e65 R15: ffffffff894cb520 debug_object_activate+0x287/0x3e0 lib/debugobjects.c:684 debug_object_activate+0x337/0x3e0 lib/debugobjects.c:702 debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline] __call_rcu kernel/rcu/tree.c:2939 [inline] call_rcu+0x2c/0x700 kernel/rcu/tree.c:3027 put_task_struct_rcu_user+0x7f/0xb0 kernel/exit.c:178 finish_task_switch+0x548/0x7a0 kernel/sched/core.c:3652 context_switch kernel/sched/core.c:3782 [inline] __schedule+0x89b/0x2130 kernel/sched/core.c:4528 preempt_schedule_notrace+0x5b/0xd0 kernel/sched/core.c:4760 preempt_schedule_notrace_thunk+0x16/0x31 arch/x86/entry/thunk_64.S:41 __perf_sw_event+0xf8/0x130 kernel/events/core.c:9131 perf_sw_event include/linux/perf_event.h:1165 [inline] mm_account_fault mm/memory.c:4570 [inline] handle_mm_fault+0x10d3/0x55d0 mm/memory.c:4621 do_user_addr_fault+0x55b/0xb40 arch/x86/mm/fault.c:1372 handle_page_fault arch/x86/mm/fault.c:1429 [inline] exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1485 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:583 RIP: 0010:copy_user_generic_string+0x2c/0x40 arch/x86/lib/copy_user_64.S:169 Code: cb 83 fa 08 72 27 89 f9 83 e1 07 74 15 83 e9 08 f7 d9 29 ca 8a 06 88 07 48 ff c6 48 ff c7 ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 0f 1f 80 00 00 00 00 0f 01 RSP: 0018:ffffc90001dbf9d0 EFLAGS: 00050246 RAX: 0000000000000001 RBX: 0000000000008000 RCX: 00000000000001fa RDX: 0000000000000000 RSI: 0000000020f0bffb RDI: ffff888068417030 RBP: ffff888068410000 R08: 0000000000000001 R09: ffff888068417fff R10: ffffed100d082fff R11: 0000000000000000 R12: 0000000020f04fcb R13: 0000000020f0cfcb R14: 0000000000000000 R15: 0000000000000000 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline] copyin.part.0+0xe4/0x110 lib/iov_iter.c:159 copyin lib/iov_iter.c:795 [inline] _copy_from_iter_full+0x22f/0x920 lib/iov_iter.c:795 copy_from_iter_full include/linux/uio.h:155 [inline] skb_do_copy_data_nocache+0x145/0x2c0 include/net/sock.h:2036 skb_copy_to_page_nocache include/net/sock.h:2062 [inline] tcp_sendmsg_locked+0x12ea/0x2d20 net/ipv4/tcp.c:1347 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1444 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:817 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 __sys_sendto+0x21c/0x320 net/socket.c:1992 __do_sys_sendto net/socket.c:2004 [inline] __se_sys_sendto net/socket.c:2000 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2000 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45de79 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe3c6aadc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045de79 RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000005 RBP: 000000000118bf78 R08: 0000000000000000 R09: 0000000009000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffdcc36500f R14: 00007fe3c6aae9c0 R15: 000000000118bf2c