rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (1 GPs behind) idle=c12/1/0x4000000000000004 softirq=144560/144561 fqs=5092 rcu: (t=10500 jiffies g=236673 q=680) NMI backtrace for cpu 1 CPU: 1 PID: 19855 Comm: syz-executor.1 Not tainted 4.19.102-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+0x197/0x210 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x189/0x1d5 kernel/rcu/tree.c:1340 print_cpu_stall kernel/rcu/tree.c:1478 [inline] check_cpu_stall kernel/rcu/tree.c:1550 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0x5e3/0xd90 kernel/rcu/tree.c:2682 update_process_times+0x32/0x80 kernel/time/timer.c:1638 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:168 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x33b/0xdc0 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1521 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline] smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1092 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x54/0x90 kernel/locking/spinlock.c:192 Code: c0 58 57 f2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d 7d 51 9d 01 00 74 20 fb 66 0f 1f 44 00 00 01 00 00 00 e8 32 c9 f3 f9 65 8b 05 db e7 ac 78 85 c0 74 06 41 RSP: 0018:ffff8880ae907dd0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11e4aeb RBX: ffff8880609c6810 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff888041f84b3c RBP: ffff8880ae907dd8 R08: ffff888041f842c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae923a00 R13: dffffc0000000000 R14: ffffffff85d88b70 R15: ffff8880ae923a00 expire_timers kernel/time/timer.c:1362 [inline] __run_timers kernel/time/timer.c:1684 [inline] __run_timers kernel/time/timer.c:1652 [inline] run_timer_softirq+0x644/0x16a0 kernel/time/timer.c:1697 __do_softirq+0x25c/0x921 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:___might_sleep+0xd4/0x2b0 kernel/sched/core.c:6194 Code: e9 03 83 c0 03 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 aa 01 00 00 8b 05 6f df 83 08 83 e8 01 83 f8 01 76 0b 5b 41 5c 41 5d 41 5e <41> 5f 5d c3 48 c7 c0 60 79 c8 8a 48 ba 00 00 00 00 00 fc ff df 48 RSP: 0018:ffff8881f3b5fc80 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff888041f842c0 RCX: 1ffffffff1278b08 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff888041f842e4 RBP: ffff8881f3b5fc88 R08: ffff888041f842c0 R09: 0000000000000000 R10: ffff888041f84b40 R11: ffffffff8a7782e8 R12: ffffffff88aa379a R13: 00000000000001a6 R14: 0000000000000000 R15: ffff888041f842c0 __might_sleep+0x95/0x190 kernel/sched/core.c:6145 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc_trace+0x2c2/0x760 mm/slab.c:3623 kmalloc include/linux/slab.h:515 [inline] sock_alloc_inode+0x63/0x260 net/socket.c:247 alloc_inode+0x64/0x190 fs/inode.c:210 new_inode_pseudo+0x19/0xf0 fs/inode.c:910 sock_alloc+0x41/0x270 net/socket.c:547 __sock_create+0xc2/0x730 net/socket.c:1240 sock_create net/socket.c:1316 [inline] __sys_socket+0x103/0x220 net/socket.c:1346 __do_sys_socket net/socket.c:1355 [inline] __se_sys_socket net/socket.c:1353 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1353 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b399 Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f16bdfd4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f16bdfd56d4 RCX: 000000000045b399 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000000a RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000b43 R14: 00000000004cc2df R15: 000000000075bf2c