BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 0 PID: 16479 Comm: syz-executor.2 Not tainted 5.8.0-rc5-next-20200716-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+0x18f/0x20d lib/dump_stack.c:118
 add_chain_cache kernel/locking/lockdep.c:3063 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3162 [inline]
 validate_chain kernel/locking/lockdep.c:3183 [inline]
 __lock_acquire.cold+0x11/0x3f8 kernel/locking/lockdep.c:4380
 lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:4959
 write_seqcount_begin_nested include/linux/seqlock.h:408 [inline]
 write_seqcount_begin include/linux/seqlock.h:413 [inline]
 psi_group_change+0xd3/0x750 kernel/sched/psi.c:707
 psi_task_change+0x142/0x220 kernel/sched/psi.c:807
 psi_enqueue kernel/sched/stats.h:82 [inline]
 enqueue_task kernel/sched/core.c:1293 [inline]
 activate_task kernel/sched/core.c:1319 [inline]
 ttwu_do_activate+0x278/0x4b0 kernel/sched/core.c:2239
 ttwu_queue kernel/sched/core.c:2404 [inline]
 try_to_wake_up+0x5f4/0x1360 kernel/sched/core.c:2655
 wake_up_worker kernel/workqueue.c:837 [inline]
 insert_work+0x298/0x370 kernel/workqueue.c:1340
 __queue_work+0x5fa/0xff0 kernel/workqueue.c:1491
 queue_work_on+0x18b/0x200 kernel/workqueue.c:1518
 queue_work include/linux/workqueue.h:507 [inline]
 schedule_work include/linux/workqueue.h:568 [inline]
 __vfree_deferred mm/vmalloc.c:2292 [inline]
 vfree_atomic+0xac/0xe0 mm/vmalloc.c:2310
 free_thread_stack kernel/fork.c:290 [inline]
 release_task_stack kernel/fork.c:425 [inline]
 put_task_stack+0x223/0x450 kernel/fork.c:436
 finish_task_switch+0x52a/0x750 kernel/sched/core.c:3316
 context_switch kernel/sched/core.c:3448 [inline]
 __schedule+0x8bc/0x1e80 kernel/sched/core.c:4169
 preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:4427
 idtentry_exit_cond_resched arch/x86/entry/common.c:663 [inline]
 idtentry_exit_cond_rcu+0xc0/0xf0 arch/x86/entry/common.c:710
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:765 [inline]
RIP: 0010:kfree+0x1e0/0x2c0 mm/slab.c:3757
Code: 4e 7e 0f 85 55 fe ff ff e8 5c 14 4d ff e9 4b fe ff ff e8 c3 94 c6 ff 48 83 3d 3b 9d 01 08 00 0f 84 d2 00 00 00 48 89 df 57 9d <0f> 1f 44 00 00 5b 5d 41 5c 41 5d c3 65 ff 05 9d 99 4e 7e 48 8b 05
RSP: 0018:ffffc900084a77d0 EFLAGS: 00000286
RAX: 00000000000018ef RBX: 0000000000000286 RCX: 0000000000000006
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000286
RBP: ffff8880a25e6d80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880aa000200
R13: ffffffff814ca531 R14: ffff88809f542928 R15: ffff88809f542820
 apply_wqattrs_cleanup kernel/workqueue.c:3890 [inline]
 apply_workqueue_attrs_locked+0xe1/0x140 kernel/workqueue.c:4032
 apply_workqueue_attrs kernel/workqueue.c:4063 [inline]
 alloc_and_link_pwqs kernel/workqueue.c:4181 [inline]
 alloc_workqueue+0x9e0/0xe50 kernel/workqueue.c:4295
 ucma_open+0x71/0x270 drivers/infiniband/core/ucma.c:1800
 misc_open+0x372/0x4a0 drivers/char/misc.c:141
 chrdev_open+0x266/0x770 fs/char_dev.c:414
 do_dentry_open+0x4b9/0x11b0 fs/open.c:822
 do_open fs/namei.c:3249 [inline]
 path_openat+0x1b97/0x2720 fs/namei.c:3366
 do_filp_open+0x17e/0x3c0 fs/namei.c:3393
 do_sys_openat2+0x16d/0x3e0 fs/open.c:1173
 do_sys_open fs/open.c:1189 [inline]
 __do_sys_openat fs/open.c:1203 [inline]
 __se_sys_openat fs/open.c:1198 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1198
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f24f336cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000004fa8c0 RCX: 000000000045cba9
RDX: 0000000000000002 RSI: 0000000020000040 RDI: ffffffffffffff9c
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000081e R14: 00000000004caf77 R15: 00007f24f336d6d4