loop4: detected capacity change from 0 to 66
general protection fault, probably for non-canonical address 0xdffffc0004000008: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: probably user-memory-access in range [0x0000000020000040-0x0000000020000047]
FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
CPU: 0 PID: 5030 Comm: syz-executor.1 Not tainted 6.3.0-rc3-next-20230327 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:do_iter_read+0x481/0x750
Code: 00 0f 85 52 02 00 00 4d 8b 7c 24 28 e8 48 2c c6 ff 48 8b 44 24 18 80 38 00 0f 85 1c 02 00 00 48 8b 43 18 48 89 c2 48 c1 ea 03 <42> 80 3c 32 00 0f 85 ef 01 00 00 48 8b 4c 24 20 48 8b 30 80 39 00
RSP: 0018:ffff888044df7c78 EFLAGS: 00010212
RAX: 0000000020000040 RBX: ffff888044df7d60 RCX: ffffc900007cf000
RDX: 0000000004000008 RSI: ffffffff81855c98 RDI: 0000000000000007
RBP: 00000000000000c1 R08: 0000000000000007 R09: 0000000000000000
R10: 00000000000000c1 R11: 0000000000000001 R12: ffff88801c75aa00
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffffff84ca58c0
FS:  00007f2671eb9700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2674a501d8 CR3: 000000000f204000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 vfs_readv+0xe5/0x160
FAT-fs (loop4): Directory bread(block 66) failed
 __x64_sys_preadv+0x233/0x310
 do_syscall_64+0x3f/0x90
FAT-fs (loop4): Directory bread(block 67) failed
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
FAT-fs (loop4): Directory bread(block 68) failed
RIP: 0033:0x7f2674943b19
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
FAT-fs (loop4): Directory bread(block 69) failed
RSP: 002b:00007f2671eb9188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f2674a56f60 RCX: 00007f2674943b19
FAT-fs (loop4): Directory bread(block 70) failed
RDX: 0000000000000001 RSI: 0000000020000300 RDI: 0000000000000003
RBP: 00007f267499df6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000312 R11: 0000000000000246 R12: 0000000000000000
FAT-fs (loop4): Directory bread(block 71) failed
R13: 00007ffc0e599d8f R14: 00007f2671eb9300 R15: 0000000000022000
FAT-fs (loop4): Directory bread(block 72) failed
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:do_iter_read+0x481/0x750
Code: 00 0f 85 52 02 00 00 4d 8b 7c 24 28 e8 48 2c c6 ff 48 8b 44 24 18 80 38 00 0f 85 1c 02 00 00 48 8b 43 18 48 89 c2 48 c1 ea 03 <42> 80 3c 32 00 0f 85 ef 01 00 00 48 8b 4c 24 20 48 8b 30 80 39 00
FAT-fs (loop4): Directory bread(block 73) failed
FAT-fs (loop4): Directory bread(block 74) failed
RSP: 0018:ffff888044df7c78 EFLAGS: 00010212
RAX: 0000000020000040 RBX: ffff888044df7d60 RCX: ffffc900007cf000
RDX: 0000000004000008 RSI: ffffffff81855c98 RDI: 0000000000000007
FAT-fs (loop4): Directory bread(block 75) failed
RBP: 00000000000000c1 R08: 0000000000000007 R09: 0000000000000000
R10: 00000000000000c1 R11: 0000000000000001 R12: ffff88801c75aa00
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffffff84ca58c0
FS:  00007f2671eb9700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2674a501d8 CR3: 000000000f204000 CR4: 0000000000350ef0
loop6: detected capacity change from 0 to 189
loop6: detected capacity change from 0 to 189
syz-executor.4 calls setitimer() with new_value NULL pointer. Misfeature support will be removed
audit: type=1400 audit(1679921056.514:13): avc:  denied  { read } for  pid=5291 comm="syz-executor.4" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1
----------------
Code disassembly (best guess):
   0:	00 0f                	add    %cl,(%rdi)
   2:	85 52 02             	test   %edx,0x2(%rdx)
   5:	00 00                	add    %al,(%rax)
   7:	4d 8b 7c 24 28       	mov    0x28(%r12),%r15
   c:	e8 48 2c c6 ff       	callq  0xffc62c59
  11:	48 8b 44 24 18       	mov    0x18(%rsp),%rax
  16:	80 38 00             	cmpb   $0x0,(%rax)
  19:	0f 85 1c 02 00 00    	jne    0x23b
  1f:	48 8b 43 18          	mov    0x18(%rbx),%rax
  23:	48 89 c2             	mov    %rax,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	42 80 3c 32 00       	cmpb   $0x0,(%rdx,%r14,1) <-- trapping instruction
  2f:	0f 85 ef 01 00 00    	jne    0x224
  35:	48 8b 4c 24 20       	mov    0x20(%rsp),%rcx
  3a:	48 8b 30             	mov    (%rax),%rsi
  3d:	80 39 00             	cmpb   $0x0,(%rcx)