BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! turning off the locking correctness validator. CPU: 0 PID: 31071 Comm: syz-executor102 Not tainted 5.6.0-rc7-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+0x1e9/0x30e lib/dump_stack.c:118 add_chain_cache kernel/locking/lockdep.c:442 [inline] lookup_chain_cache_add kernel/locking/lockdep.c:2914 [inline] validate_chain+0x3e6b/0x7be0 kernel/locking/lockdep.c:2935 __lock_acquire+0xc5a/0x1bc0 kernel/locking/lockdep.c:3954 lock_acquire+0x154/0x250 kernel/locking/lockdep.c:4484 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 update_cfs_rq_load_avg kernel/sched/fair.c:3485 [inline] update_load_avg+0x1b7/0x1060 kernel/sched/fair.c:3605 enqueue_entity+0x10d/0xea0 kernel/sched/fair.c:4023 enqueue_task_fair+0x283/0xe50 kernel/sched/fair.c:5259 enqueue_task kernel/sched/core.c:1307 [inline] activate_task+0x2e0/0x3a0 kernel/sched/core.c:1329 ttwu_do_activate kernel/sched/core.c:2260 [inline] ttwu_queue kernel/sched/core.c:2405 [inline] try_to_wake_up+0xac0/0xfe0 kernel/sched/core.c:2639 __queue_work+0x90d/0xc60 kernel/workqueue.c:1488 queue_work_on+0xcb/0x1a0 kernel/workqueue.c:1515 release_task_stack kernel/fork.c:440 [inline] put_task_stack+0x9c/0x120 kernel/fork.c:451 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3251 context_switch kernel/sched/core.c:3383 [inline] __schedule+0x7d1/0xc50 kernel/sched/core.c:4080 preempt_schedule_irq+0xca/0x150 kernel/sched/core.c:4337 retint_kernel+0x1b/0x2b RIP: 0010:compound_head include/linux/page-flags.h:176 [inline] RIP: 0010:virt_to_head_page include/linux/mm.h:723 [inline] RIP: 0010:qlink_to_cache mm/kasan/quarantine.c:128 [inline] RIP: 0010:qlist_free_all mm/kasan/quarantine.c:164 [inline] RIP: 0010:quarantine_reduce+0x13d/0x1c0 mm/kasan/quarantine.c:260 Code: 89 15 e7 53 83 09 48 c7 c7 48 a2 10 89 48 89 c6 e8 58 d7 49 06 48 89 ef e8 40 3f 84 ff 48 c1 e8 06 48 83 e0 c0 49 8b 4c 07 08 c1 01 75 1d 4c 01 f8 48 8b 70 18 48 8b 5d 00 48 89 ef e8 eb 03 RSP: 0018:ffffc900076bf608 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 000000000267ed80 RBX: ffff888099fb6918 RCX: ffffea00024fa0c8 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888099fb6918 R08: ffffffff813519dc R09: fffffbfff15dbb1a R10: fffffbfff15dbb1a R11: 0000000000000000 R12: 0000000000000880 R13: 0000000000001000 R14: 0000000000000000 R15: ffffea0000000000 __kasan_kmalloc+0x43/0x1c0 mm/kasan/common.c:496 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc mm/slab.c:3320 [inline] __do_kmalloc mm/slab.c:3654 [inline] __kmalloc+0x228/0x330 mm/slab.c:3665 kmalloc include/linux/slab.h:560 [inline] sk_prot_alloc+0xa7/0x2b0 net/core/sock.c:1603 sk_alloc+0x35/0x990 net/core/sock.c:1657 tun_chr_open+0x77/0x460 drivers/net/tun.c:3423 misc_open+0x346/0x3c0 drivers/char/misc.c:141 chrdev_open+0x498/0x580 fs/char_dev.c:414 do_dentry_open+0x828/0x10a0 fs/open.c:797 do_last fs/namei.c:3490 [inline] path_openat+0x13b5/0x40d0 fs/namei.c:3607 do_filp_open+0x191/0x3a0 fs/namei.c:3637 do_sys_openat2+0x448/0x6c0 fs/open.c:1146 do_sys_open fs/open.c:1162 [inline] __do_sys_openat fs/open.c:1176 [inline] __se_sys_openat fs/open.c:1171 [inline] __x64_sys_openat+0x1c8/0x1f0 fs/open.c:1171 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441279 Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd16066308 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441279 RDX: 0000000000000000 RSI: 0000000020000080 RDI: ffffffffffffff9c RBP: 00000000001ea318 R08: 0000000000000004 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401ff0 R13: 0000000000402080 R14: 0000000000000000 R15: 0000000000000000