------------[ cut here ]------------
do not call blocking ops when !TASK_RUNNING; state=2 set at [<ffffffff81e29fad>] prepare_to_wait_event+0x8d/0x720 kernel/sched/wait.c:317
WARNING: kernel/sched/core.c:9157 at __might_sleep+0x94/0xc0 kernel/sched/core.c:9157, CPU#0: syz.1.180/6346
Modules linked in:
CPU: 0 UID: 0 PID: 6346 Comm: syz.1.180 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__might_sleep+0x97/0xc0 kernel/sched/core.c:9157
Code: 8b 94 24 80 18 00 00 48 85 d2 75 14 48 83 c4 08 89 ee 48 89 df 31 d2 5b 5d 41 5c e9 33 fc ff ff 48 8d 3d 0c 3c 70 0f 48 89 d1 <67> 48 0f b9 3a eb db e8 bd bf a7 00 eb 9f 89 74 24 04 e8 e2 bf a7
RSP: 0018:ffffc90007817b88 EFLAGS: 00010282
RAX: dffffc0000000000 RBX: ffffffff8befd0a0 RCX: ffffffff81e29fad
RDX: ffffffff81e29fad RSI: 0000000000000002 RDI: ffffffff914651d0
RBP: 000000000000026f R08: ffffffff81fcdfa2 R09: 0000000000000000
R10: ffffc90007817d40 R11: 0000000000000000 R12: ffff88802ec78000
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffffff8ea0e030
FS:  00007fa074f3d6c0(0000) GS:ffff8880d5ba2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa074f3cff8 CR3: 000000005aebd000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __mutex_lock_common kernel/locking/mutex.c:623 [inline]
 __mutex_lock+0x10e/0x1bc0 kernel/locking/mutex.c:821
 class_mutex_constructor include/linux/mutex.h:253 [inline]
 futex_pivot_pending kernel/futex/core.c:1791 [inline]
 futex_hash_allocate+0xd22/0x1120 kernel/futex/core.c:1874
 futex_hash_prctl+0x1b8/0x390 kernel/futex/core.c:2029
 __do_sys_prctl+0x16dd/0x2270 kernel/sys.c:2885
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa073f9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa074f3d028 EFLAGS: 00000246 ORIG_RAX: 000000000000009d
RAX: ffffffffffffffda RBX: 00007fa074225fa0 RCX: 00007fa073f9e0d9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000004e
RBP: 00007fa074035024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa074226038 R14: 00007fa074225fa0 R15: 00007ffe33f5d078
 </TASK>
----------------
Code disassembly (best guess):
   0:	8b 94 24 80 18 00 00 	mov    0x1880(%rsp),%edx
   7:	48 85 d2             	test   %rdx,%rdx
   a:	75 14                	jne    0x20
   c:	48 83 c4 08          	add    $0x8,%rsp
  10:	89 ee                	mov    %ebp,%esi
  12:	48 89 df             	mov    %rbx,%rdi
  15:	31 d2                	xor    %edx,%edx
  17:	5b                   	pop    %rbx
  18:	5d                   	pop    %rbp
  19:	41 5c                	pop    %r12
  1b:	e9 33 fc ff ff       	jmp    0xfffffc53
  20:	48 8d 3d 0c 3c 70 0f 	lea    0xf703c0c(%rip),%rdi        # 0xf703c33
  27:	48 89 d1             	mov    %rdx,%rcx
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	eb db                	jmp    0xc
  31:	e8 bd bf a7 00       	call   0xa7bff3
  36:	eb 9f                	jmp    0xffffffd7
  38:	89 74 24 04          	mov    %esi,0x4(%rsp)
  3c:	e8                   	.byte 0xe8
  3d:	e2 bf                	loop   0xfffffffe
  3f:	a7                   	cmpsl  %es:(%rdi),%ds:(%rsi)