=============================
[ BUG: Invalid wait context ]
5.7.0-rc6-next-20200519-syzkaller #0 Not tainted
-----------------------------
swapper/0/1 is trying to lock:
ffff8880ae737518 (&pool->lock){..-.}-{3:3}, at: spin_lock include/linux/spinlock.h:353 [inline]
ffff8880ae737518 (&pool->lock){..-.}-{3:3}, at: __queue_work+0x2bf/0x1350 kernel/workqueue.c:1448
other info that might help us debug this:
context-{2:2}
4 locks held by swapper/0/1:
 #0: ffffffff89c082a8 (event_mutex){+.+.}-{4:4}, at: early_event_add_tracer kernel/trace/trace_events.c:3290 [inline]
 #0: ffffffff89c082a8 (event_mutex){+.+.}-{4:4}, at: event_trace_init+0x2d8/0x502 kernel/trace/trace_events.c:3456
 #1: ffffffff89c02830 (trace_event_sem){+.+.}-{4:4}, at: early_event_add_tracer kernel/trace/trace_events.c:3296 [inline]
 #1: ffffffff89c02830 (trace_event_sem){+.+.}-{4:4}, at: event_trace_init+0x309/0x502 kernel/trace/trace_events.c:3456
 #2: ffff8880a9c2f150 (&sb->s_type->i_mutex_key#5){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:801 [inline]
 #2: ffff8880a9c2f150 (&sb->s_type->i_mutex_key#5){+.+.}-{4:4}, at: start_creating.part.0+0x4e/0x200 fs/tracefs/inode.c:332
 #3: ffffffff89bc0040 (rcu_read_lock){....}-{1:3}, at: __queue_work+0x175/0x1350 kernel/workqueue.c:1411
stack backtrace:
CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.7.0-rc6-next-20200519-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 print_lock_invalid_wait_context kernel/locking/lockdep.c:3988 [inline]
 check_wait_context kernel/locking/lockdep.c:4049 [inline]
 __lock_acquire.cold+0x26c/0x458 kernel/locking/lockdep.c:4286
 lock_acquire+0x20e/0x960 kernel/locking/lockdep.c:4915
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:353 [inline]
 __queue_work+0x2bf/0x1350 kernel/workqueue.c:1448
 queue_work_on+0x18b/0x200 kernel/workqueue.c:1517
 tick_nohz_activate kernel/time/tick-sched.c:1244 [inline]
 tick_nohz_activate kernel/time/tick-sched.c:1237 [inline]
 tick_setup_sched_timer+0x20e/0x380 kernel/time/tick-sched.c:1378
 hrtimer_switch_to_hres kernel/time/hrtimer.c:739 [inline]
 hrtimer_run_queues+0x327/0x3e0 kernel/time/hrtimer.c:1746
 run_local_timers+0x49/0x130 kernel/time/timer.c:1798
 update_process_times+0x1e/0x60 kernel/time/timer.c:1725
 tick_periodic+0x79/0x170 kernel/time/tick-common.c:99
 tick_handle_periodic+0x41/0x130 kernel/time/tick-common.c:111
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 smp_apic_timer_interrupt+0x1ad/0x6a0 arch/x86/kernel/apic/apic.c:1105
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:828
 </IRQ>
RIP: 0010:unwind_next_frame+0x940/0x1df0 arch/x86/kernel/unwind_orc.c:462
Code: 80 3c 02 00 0f 85 0f 13 00 00 4c 89 c0 49 8b 57 38 48 b9 00 00 00 00 00 fc ff df 48 c1 e8 03 0f b6 34 08 49 8d 40 01 48 89 c7 <48> c1 ef 03 0f b6 0c 0f 4c 89 c7 83 e7 07 40 38 fe 40 0f 9e c7 40
RSP: 0000:ffffc90000c7f250 EFLAGS: 00000a03 ORIG_RAX: ffffffffffffff13
RAX: ffffffff8b1fd235 RBX: 1ffff9200018fe52 RCX: dffffc0000000000
RDX: ffffc90000c7f660 RSI: 0000000000000000 RDI: ffffffff8b1fd235
RBP: 0000000000000001 R08: ffffffff8b1fd234 R09: ffffffff8b1fd238
R10: 00000000000291fd R11: 000000000007201f R12: ffffc90000c7f370
R13: ffffc90000c7f35d R14: ffffc90000c7f378 R15: ffffc90000c7f328
 arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc mm/kasan/common.c:494 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467
 slab_post_alloc_hook mm/slab.h:587 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x11b/0x760 mm/slab.c:3484
 __d_alloc+0x2a/0x920 fs/dcache.c:1709
 d_alloc+0x4a/0x240 fs/dcache.c:1788
 d_alloc_parallel+0xf6/0x1b70 fs/dcache.c:2540
 __lookup_slow+0x193/0x490 fs/namei.c:1515
 lookup_one_len+0x163/0x190 fs/namei.c:2548
 start_creating.part.0+0xd3/0x200 fs/tracefs/inode.c:336
 start_creating fs/tracefs/inode.c:321 [inline]
 tracefs_create_file+0xc6/0x4a0 fs/tracefs/inode.c:403
 trace_create_file+0x2f/0x50 kernel/trace/trace.c:8226
 event_create_dir+0x3c4/0x15e0 kernel/trace/trace_events.c:2212
 __trace_early_add_event_dirs kernel/trace/trace_events.c:3129 [inline]
 early_event_add_tracer kernel/trace/trace_events.c:3297 [inline]
 event_trace_init+0x396/0x502 kernel/trace/trace_events.c:3456
 tracer_init_tracefs+0xf7/0x26e kernel/trace/trace.c:9064
 do_one_initcall+0x126/0x820 init/main.c:1198
 do_initcall_level init/main.c:1271 [inline]
 do_initcalls init/main.c:1287 [inline]
 do_basic_setup init/main.c:1307 [inline]
 kernel_init_freeable+0x501/0x5b0 init/main.c:1493
 kernel_init+0xd/0x1bb init/main.c:1398
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351
random: fast init done
random: 7 urandom warning(s) missed due to ratelimiting