BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 PID: 5357 Comm: syz-executor.5 Not tainted 5.8.0-rc5-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
 seqcount_lockdep_reader_access include/linux/seqlock.h:97 [inline]
 read_seqcount_begin.constprop.0+0xae/0x1f0 include/linux/seqlock.h:182
 ktime_get+0x3e/0x120 kernel/time/timekeeping.c:757
 __hrtimer_start_range_ns kernel/time/hrtimer.c:1094 [inline]
 hrtimer_start_range_ns+0x158/0x830 kernel/time/hrtimer.c:1133
 perf_swevent_start_hrtimer kernel/events/core.c:10145 [inline]
 cpu_clock_event_start kernel/events/core.c:10215 [inline]
 cpu_clock_event_add+0xbd/0xe0 kernel/events/core.c:10227
 event_sched_in+0x448/0xe10 kernel/events/core.c:2516
 group_sched_in kernel/events/core.c:2552 [inline]
 merge_sched_in+0x863/0x12f0 kernel/events/core.c:3632
 visit_groups_merge.constprop.0.isra.0+0x521/0x1080 kernel/events/core.c:3605
 ctx_flexible_sched_in kernel/events/core.c:3672 [inline]
 ctx_sched_in+0x2da/0x780 kernel/events/core.c:3717
 perf_event_sched_in+0x69/0xa0 kernel/events/core.c:2661
 perf_event_context_sched_in kernel/events/core.c:3757 [inline]
 __perf_event_task_sched_in+0x6a1/0x990 kernel/events/core.c:3796
 perf_event_task_sched_in include/linux/perf_event.h:1199 [inline]
 finish_task_switch+0x437/0x750 kernel/sched/core.c:3290
 context_switch kernel/sched/core.c:3456 [inline]
 __schedule+0x8e9/0x1eb0 kernel/sched/core.c:4178
 preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:4436
 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:lock_acquire+0x270/0xad0 kernel/locking/lockdep.c:4962
Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 f8 06 00 00 48 83 3d ad d0 5a 08 00 0f 84 a6 05 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 10 48 c7
RSP: 0000:ffffc9000d6878e0 EFLAGS: 00000282
RAX: 1ffffffff1369c10 RBX: ffff888095268540 RCX: ffffffff8c8bbe88
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000282
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8c712e2f
R10: fffffbfff18e25c5 R11: 0000000000000000 R12: 0000000000000001
R13: ffff888214e770f0 R14: 0000000000000000 R15: ffff888087d742a8
 down_read+0x96/0x420 kernel/locking/rwsem.c:1492
 snd_seq_info_dump_subscribers+0x31/0x4f0 sound/core/seq/seq_clientmgr.c:2393
 snd_seq_info_dump_ports sound/core/seq/seq_clientmgr.c:2437 [inline]
 snd_seq_info_clients_read+0x3c3/0x7c0 sound/core/seq/seq_clientmgr.c:2470
 snd_info_seq_show+0xc5/0x110 sound/core/info.c:362
 seq_read+0x432/0x1070 fs/seq_file.c:208
 pde_read fs/proc/inode.c:306 [inline]
 proc_reg_read+0x221/0x300 fs/proc/inode.c:318
 do_loop_readv_writev fs/read_write.c:734 [inline]
 do_loop_readv_writev fs/read_write.c:721 [inline]
 do_iter_read+0x48e/0x650 fs/read_write.c:955
 vfs_readv+0xe5/0x150 fs/read_write.c:1073
 do_preadv fs/read_write.c:1165 [inline]
 __do_sys_preadv fs/read_write.c:1215 [inline]
 __se_sys_preadv fs/read_write.c:1210 [inline]
 __x64_sys_preadv+0x231/0x310 fs/read_write.c:1210
 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:00007fdec2225c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00000000004fd040 RCX: 000000000045cba9
RDX: 00000000000000e3 RSI: 00000000200017c0 RDI: 0000000000000004
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000008bc R14: 00000000004cba6f R15: 00007fdec22266d4