netlink: 20 bytes leftover after parsing attributes in process `syz-executor.0'. rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=c6e/1/0x4000000000000004 softirq=237051/237052 fqs=6 rcu: (t=10500 jiffies g=289181 q=237) rcu: rcu_preempt kthread starved for 10488 jiffies! g289181 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29136 10 2 0x80000000 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x4d1/0xf20 kernel/time/timer.c:1806 rcu_gp_kthread+0xcee/0x2060 kernel/rcu/tree.c:2202 kthread+0x34a/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 NMI backtrace for cpu 1 CPU: 1 PID: 26494 Comm: syz-executor.2 Not tainted 4.19.113-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+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x170/0x1bb 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+0x634/0xddc kernel/rcu/tree.c:2682 update_process_times+0x2a/0x70 kernel/time/timer.c:1638 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0x42/0x130 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x2fc/0xd50 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1521 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:preempt_count_add+0x9f/0x190 kernel/sched/core.c:3240 Code: 15 86 7e 26 0a 85 d2 75 11 65 8b 05 ab 42 bb 7e 0f b6 c0 3d f4 00 00 00 7f 64 65 8b 05 9a 42 bb 7e 25 ff ff ff 7f 39 c5 74 03 <5b> 5d c3 48 8b 5c 24 10 48 89 df e8 c1 62 09 00 85 c0 75 35 65 48 RSP: 0018:ffff8880ae707d00 EFLAGS: 00000287 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000101 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff85b0516b RDI: 0000000000000001 RBP: 0000000000000001 R08: ffff88820b4a2380 R09: ffffed1015ce4733 R10: ffffed1015ce4732 R11: ffff8880ae723993 R12: ffff888054804280 R13: 1ffff11015ce0faa R14: 0000000000000000 R15: ffff888040fe42d8 __raw_spin_lock include/linux/spinlock_api_smp.h:141 [inline] _raw_spin_lock+0xe/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] mrp_periodic_timer+0x1b/0x50 net/802/mrp.c:612 call_timer_fn+0x177/0x700 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers kernel/time/timer.c:1684 [inline] __run_timers kernel/time/timer.c:1652 [inline] run_timer_softirq+0x5d0/0x1540 kernel/time/timer.c:1697 __do_softirq+0x26c/0x93c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x17b/0x1c0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:544 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:__find_get_block+0x275/0xda0 fs/buffer.c:1293 Code: ff df 48 c1 ea 03 80 3c 02 00 0f 85 2f 0a 00 00 48 83 3d 05 89 fd 06 00 0f 84 a0 07 00 00 e8 02 d5 b2 ff fb 66 0f 1f 44 00 00 <4d> 85 f6 0f 84 be 01 00 00 e8 ed d4 b2 ff 0f 1f 44 00 00 e8 e3 d4 RSP: 0018:ffff8881f42af5b8 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: ffff88809934d000 RCX: ffffc9000a2c0000 RDX: 000000000000f0a5 RSI: ffffffff81b4cd9e RDI: ffff88820b4a2bfc RBP: 0000000000000000 R08: ffff88820b4a2380 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff88809934d000 R15: 0000000000000433 sb_find_get_block include/linux/buffer_head.h:338 [inline] recently_deleted fs/ext4/ialloc.c:685 [inline] find_inode_bit.isra.0+0x208/0x530 fs/ext4/ialloc.c:725 __ext4_new_inode+0x1645/0x5b00 fs/ext4/ialloc.c:917 ext4_create+0x209/0x5a0 fs/ext4/namei.c:2477 lookup_open+0x11f6/0x19b0 fs/namei.c:3235 do_last fs/namei.c:3327 [inline] path_openat+0x13cb/0x4200 fs/namei.c:3537 do_filp_open+0x1a1/0x280 fs/namei.c:3567 do_sys_open+0x3c0/0x500 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c849 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:00007f5b99936c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f5b999376d4 RCX: 000000000045c849 RDX: 0000000000000000 RSI: 0000800000141042 RDI: 00000000200000c0 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000771 R14: 000000000050435f R15: 000000000076bf0c