netlink: 20 bytes leftover after parsing attributes in process `syz-executor.4'. rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (1 GPs behind) idle=5e2/1/0x4000000000000004 softirq=55281/55283 fqs=13 rcu: (t=10501 jiffies g=73097 q=191) rcu: rcu_preempt kthread starved for 10476 jiffies! g73097 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29088 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 schedule+0x92/0x1c0 kernel/sched/core.c:3559 schedule_timeout+0x4db/0xfc0 kernel/time/timer.c:1806 rcu_gp_kthread+0xd4e/0x21c0 kernel/rcu/tree.c:2202 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 NMI backtrace for cpu 0 CPU: 0 PID: 25673 Comm: syz-executor.0 Not tainted 4.19.104-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+0x5f2/0xdbb 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:rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1081 [inline] RIP: 0010:rcu_lockdep_current_cpu_online+0x13d/0x1c0 kernel/rcu/tree.c:1068 Code: f8 48 c1 e8 03 42 80 3c 20 00 75 75 49 8b 46 68 48 85 c3 0f 84 31 ff ff ff bf 01 00 00 00 e8 8a ff ef ff 65 8b 05 33 fe a8 7e <85> c0 74 30 b8 01 00 00 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 5d c3 RSP: 0018:ffff8880ae807cc8 EFLAGS: 00000213 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000101 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000004 RSI: ffffffff836a11c8 RDI: 0000000000000001 RBP: ffff8880ae807cf0 R08: ffff888091f86280 R09: ffffed1015d04733 R10: ffffed1015d04732 R11: ffff8880ae823993 R12: dffffc0000000000 R13: ffffffff88f957c0 R14: ffffffff88f957c0 R15: 0000000000000000 rcu_read_lock_sched_held+0x97/0x130 kernel/rcu/update.c:115 trace_timer_expire_exit include/trace/events/timer.h:121 [inline] call_timer_fn+0x632/0x720 kernel/time/timer.c:1327 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+0x64f/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:544 [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:__sanitizer_cov_trace_pc+0x32/0x50 kernel/kcov.c:107 Code: 65 48 8b 04 25 40 ee 01 00 65 8b 15 48 bf 96 7e 81 e2 00 01 1f 00 75 2b 8b 90 d0 12 00 00 83 fa 02 75 20 48 8b 88 d8 12 00 00 <8b> 80 d4 12 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 RSP: 0018:ffff888032d1f3d8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff888091f86280 RBX: 0000000000000000 RCX: ffffc90005ea6000 RDX: 0000000000000002 RSI: ffffffff8175b480 RDI: 0000000000000004 RBP: ffff888032d1f3d8 R08: ffff888091f86280 R09: ffffed1015d04733 R10: ffffed1015d04732 R11: ffff8880ae823993 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 bpf_prog_kallsyms_find+0x50/0x2c0 kernel/bpf/core.c:509 is_bpf_text_address+0x78/0x170 kernel/bpf/core.c:546 kernel_text_address+0x73/0xf0 kernel/extable.c:152 __kernel_text_address+0xd/0x40 kernel/extable.c:107 unwind_get_return_address arch/x86/kernel/unwind_frame.c:18 [inline] unwind_get_return_address+0x61/0xa0 arch/x86/kernel/unwind_frame.c:13 __save_stack_trace+0x99/0x100 arch/x86/kernel/stacktrace.c:45 save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60 save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15d/0x750 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] kzalloc include/linux/slab.h:709 [inline] __list_lru_init+0xd5/0x720 mm/list_lru.c:613 alloc_super fs/super.c:269 [inline] sget_userns+0x84a/0xd30 fs/super.c:519 mount_ns+0x90/0x1d0 fs/super.c:1068 mqueue_mount+0xcd/0xf0 ipc/mqueue.c:357 mount_fs+0xa8/0x31f fs/super.c:1261 vfs_kern_mount.part.0+0x6f/0x410 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] kern_mount_data+0x5a/0xd0 fs/namespace.c:3255 mq_init_ns+0x167/0x230 ipc/mqueue.c:1548 create_ipc_ns ipc/namespace.c:58 [inline] copy_ipcs+0x26a/0x430 ipc/namespace.c:84 create_new_namespaces+0x21a/0x7b0 kernel/nsproxy.c:87 copy_namespaces+0x351/0x3f0 kernel/nsproxy.c:165 copy_process.part.0+0x39ad/0x7a60 kernel/fork.c:1900 copy_process kernel/fork.c:1694 [inline] _do_fork+0x257/0xfd0 kernel/fork.c:2207 __do_sys_clone kernel/fork.c:2314 [inline] __se_sys_clone kernel/fork.c:2308 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2308 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c6c9 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:00007fc7e31ecc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fc7e31ed6d4 RCX: 000000000045c6c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000068002100 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000074 R14: 00000000004c2f99 R15: 000000000076bf2c