loop3: detected capacity change from 0 to 64
FAT-fs (loop3): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop3): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 4027 Comm: syz-executor.7 Not tainted 5.16.0-rc5-next-20211217 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:set_task_ioprio+0x2de/0x6a0 block/blk-ioc.c:289
Code: 4c 8b ab 50 11 00 00 4d 85 ed 0f 84 9b 01 00 00 e8 97 c6 4d ff 49 8d 7d 0c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 63
RSP: 0018:ffff88804028fe90 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: ffff88800dce1ac0 RCX: ffffc90002592000
RDX: 0000000000000001 RSI: ffffffff81f56989 RDI: 000000000000000c
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff86a06817
R10: fffffbfff0d40d02 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88800dce2348 R15: ffff88800dce2c10
FS:  00007f6af281a700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000001fffff80 CR3: 000000001a6ca000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __do_sys_ioprio_set+0x588/0xad0 block/ioprio.c:124
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f6af52a4b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6af281a188 EFLAGS: 00000246 ORIG_RAX: 00000000000000fb
RAX: ffffffffffffffda RBX: 00007f6af53b7f60 RCX: 00007f6af52a4b19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f6af52fef6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcb223d10f R14: 00007f6af281a300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:set_task_ioprio+0x2de/0x6a0 block/blk-ioc.c:289
Code: 4c 8b ab 50 11 00 00 4d 85 ed 0f 84 9b 01 00 00 e8 97 c6 4d ff 49 8d 7d 0c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 63
RSP: 0018:ffff88804028fe90 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: ffff88800dce1ac0 RCX: ffffc90002592000
RDX: 0000000000000001 RSI: ffffffff81f56989 RDI: 000000000000000c
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff86a06817
R10: fffffbfff0d40d02 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88800dce2348 R15: ffff88800dce2c10
FS:  00007f6af281a700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000001fffff80 CR3: 000000001a6ca000 CR4: 0000000000350ef0
note: syz-executor.7[4027] exited with preempt_count 1
BUG: sleeping function called from invalid context at include/linux/percpu-rwsem.h:49
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 4027, name: syz-executor.7
preempt_count: 0, expected: 0
RCU nest depth: 1, expected: 0
INFO: lockdep is turned off.
CPU: 0 PID: 4027 Comm: syz-executor.7 Tainted: G      D           5.16.0-rc5-next-20211217 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106
 __might_resched.cold+0x222/0x26b kernel/sched/core.c:9583
 percpu_down_read include/linux/percpu-rwsem.h:49 [inline]
 cgroup_threadgroup_change_begin include/linux/cgroup-defs.h:722 [inline]
 exit_signals+0x21/0x8e0 kernel/signal.c:2950
 do_exit+0x618/0x2960 kernel/exit.c:788
 rewind_stack_do_exit+0x17/0x17 arch/x86/entry/entry_64.S:1439
RIP: 0033:0x7f6af52a4b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6af281a188 EFLAGS: 00000246 ORIG_RAX: 00000000000000fb
RAX: ffffffffffffffda RBX: 00007f6af53b7f60 RCX: 00007f6af52a4b19
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f6af52fef6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcb223d10f R14: 00007f6af281a300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	4c 8b ab 50 11 00 00 	mov    0x1150(%rbx),%r13
   7:	4d 85 ed             	test   %r13,%r13
   a:	0f 84 9b 01 00 00    	je     0x1ab
  10:	e8 97 c6 4d ff       	callq  0xff4dc6ac
  15:	49 8d 7d 0c          	lea    0xc(%r13),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx <-- trapping instruction
  2e:	48 89 f8             	mov    %rdi,%rax
  31:	83 e0 07             	and    $0x7,%eax
  34:	83 c0 01             	add    $0x1,%eax
  37:	38 d0                	cmp    %dl,%al
  39:	7c 08                	jl     0x43
  3b:	84 d2                	test   %dl,%dl
  3d:	0f                   	.byte 0xf
  3e:	85                   	.byte 0x85
  3f:	63                   	.byte 0x63