EXT4-fs error (device loop1): ext4_find_dest_de:2115: inode #12: block 7: comm syz.1.274: bad entry in directory: rec_len is too small for name_len - offset=16, inode=14, rec_len=40, size=56 fake=0
EXT4-fs (loop1): Remounting filesystem read-only
general protection fault, probably for non-canonical address 0xdffffc001fffffff: 0000 [#1] PREEMPT SMP KASAN
KASAN: probably user-memory-access in range [0x00000000fffffff8-0x00000000ffffffff]
CPU: 1 PID: 5806 Comm: syz.1.274 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:dvb_device_open+0xda/0x370 drivers/media/dvb-core/dvbdev.c:103
Code: 4c 89 e5 48 c1 ed 03 80 7c 1d 00 00 74 08 4c 89 e7 e8 ba bf 0d fb 4d 8b 2c 24 4d 85 ed 0f 84 5b 01 00 00 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ef e8 98 bf 0d fb 49 8b 7d 00 e8 df b7 a9
RSP: 0018:ffffc9000c3c77b0 EFLAGS: 00010207
RAX: 000000001fffffff RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: 1ffff11028cf3783 R08: ffffffff8d8ae26f R09: 1ffffffff1b15c4d
R10: dffffc0000000000 R11: fffffbfff1b15c4e R12: ffff88814679bc18
R13: 00000000ffffffff R14: ffff8880291b59a0 R15: ffff88814679bc00
FS:  00007f760c4486c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fe0bff8 CR3: 000000007c75f000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 chrdev_open+0x5c5/0x6a0 fs/char_dev.c:414
 do_dentry_open+0x7e9/0x10d0 fs/open.c:882
 do_open fs/namei.c:3634 [inline]
 path_openat+0x2635/0x2ee0 fs/namei.c:3791
 do_filp_open+0x1f1/0x430 fs/namei.c:3818
 do_sys_openat2+0x150/0x4b0 fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1347
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f760b55d60e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f760c447b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f760c4486c0 RCX: 00007f760b55d60e
RDX: 0000000000000002 RSI: 00007f760c447c00 RDI: ffffffffffffff9c
RBP: 00007f760c447c00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007f760b816038 R14: 00007f760b815fa0 R15: 00007ffc22cdabe8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dvb_device_open+0xda/0x370 drivers/media/dvb-core/dvbdev.c:103
Code: 4c 89 e5 48 c1 ed 03 80 7c 1d 00 00 74 08 4c 89 e7 e8 ba bf 0d fb 4d 8b 2c 24 4d 85 ed 0f 84 5b 01 00 00 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ef e8 98 bf 0d fb 49 8b 7d 00 e8 df b7 a9
RSP: 0018:ffffc9000c3c77b0 EFLAGS: 00010207
RAX: 000000001fffffff RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: 1ffff11028cf3783 R08: ffffffff8d8ae26f R09: 1ffffffff1b15c4d
R10: dffffc0000000000 R11: fffffbfff1b15c4e R12: ffff88814679bc18
R13: 00000000ffffffff R14: ffff8880291b59a0 R15: ffff88814679bc00
FS:  00007f760c4486c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f760b5ea4c0 CR3: 000000007c75f000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	4c 89 e5             	mov    %r12,%rbp
   3:	48 c1 ed 03          	shr    $0x3,%rbp
   7:	80 7c 1d 00 00       	cmpb   $0x0,0x0(%rbp,%rbx,1)
   c:	74 08                	je     0x16
   e:	4c 89 e7             	mov    %r12,%rdi
  11:	e8 ba bf 0d fb       	call   0xfb0dbfd0
  16:	4d 8b 2c 24          	mov    (%r12),%r13
  1a:	4d 85 ed             	test   %r13,%r13
  1d:	0f 84 5b 01 00 00    	je     0x17e
  23:	4c 89 e8             	mov    %r13,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 ef             	mov    %r13,%rdi
  33:	e8 98 bf 0d fb       	call   0xfb0dbfd0
  38:	49 8b 7d 00          	mov    0x0(%r13),%rdi
  3c:	e8                   	.byte 0xe8
  3d:	df                   	.byte 0xdf
  3e:	b7 a9                	mov    $0xa9,%bh