------------[ cut here ]------------
do not call blocking ops when !TASK_RUNNING; state=1 set at [<ffffffff85b6d1eb>] hpet_read+0x21b/0x6a0 drivers/char/hpet.c:285
WARNING: kernel/sched/core.c:9187 at __might_sleep+0x94/0xc0 kernel/sched/core.c:9187, CPU#0: syz.0.873/9126
Modules linked in:
CPU: 0 UID: 0 PID: 9126 Comm: syz.0.873 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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:9187
Code: 8b 94 24 a8 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 dc 41 71 0f 48 89 d1 <67> 48 0f b9 3a eb db e8 2d 64 a8 00 eb 9f 89 74 24 04 e8 52 64 a8
RSP: 0018:ffffc90003237af0 EFLAGS: 00010286
RAX: dffffc0000000000 RBX: ffffffff8c7539a0 RCX: ffffffff85b6d1eb
RDX: ffffffff85b6d1eb RSI: 0000000000000001 RDI: ffffffff914843d0
RBP: 0000000000000135 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888027c6cb00
R13: 0000000000000000 R14: ffff88802a686540 R15: ffffed1004f8dc75
FS:  00007f00881d16c0(0000) GS:ffff8880d5b53000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005647a4805c10 CR3: 0000000025e26000 CR4: 0000000000352ef0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __might_fault+0x8b/0x140 mm/memory.c:7480
 hpet_read+0x56f/0x6a0 drivers/char/hpet.c:309
 do_loop_readv_writev fs/read_write.c:848 [inline]
 do_loop_readv_writev fs/read_write.c:836 [inline]
 vfs_readv+0x5d8/0x8d0 fs/read_write.c:1021
 do_preadv+0x1ac/0x270 fs/read_write.c:1133
 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: 0033:0x7f008739e159
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:00007f00881d1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f0087625fa0 RCX: 00007f008739e159
RDX: 0000000000000002 RSI: 0000200000000240 RDI: 0000000000000004
RBP: 00007f008743506b R08: 0000000000000000 R09: 0000000000000000
R10: 00000000d6840391 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0087626038 R14: 00007f0087625fa0 R15: 00007ffc9717caf8
 </TASK>
----------------
Code disassembly (best guess):
   0:	8b 94 24 a8 18 00 00 	mov    0x18a8(%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 dc 41 71 0f 	lea    0xf7141dc(%rip),%rdi        # 0xf714203
  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 2d 64 a8 00       	call   0xa86463
  36:	eb 9f                	jmp    0xffffffd7
  38:	89 74 24 04          	mov    %esi,0x4(%rsp)
  3c:	e8                   	.byte 0xe8
  3d:	52                   	push   %rdx
  3e:	64                   	fs
  3f:	a8                   	.byte 0xa8