syzbot


upstream boot error: BUG: unable to handle kernel paging request in ext4_get_group_desc

Status: upstream: reported on 2022/08/16 08:42
Reported-by: syzbot+5a9aafd202006e109827@syzkaller.appspotmail.com
First crash: 51d, last: 51d

Sample crash report:
BUG: unable to handle page fault for address: ffffdc0000000005
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 11826067 P4D 11826067 PUD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3268 Comm: S50sshd Not tainted 5.19.0-syzkaller-14135-g6c833c0581f1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:ext4_get_group_desc+0x231/0x500 fs/ext4/balloc.c:299
Code: 8b e8 e3 12 4d ff 4d 85 e4 0f 84 3d 02 00 00 e8 35 ab 69 ff 49 8d 7c 24 28 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 86 02 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89
RSP: 0018:ffffc900033ff4d8 EFLAGS: 00010a06
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 1fffe00000000005 RSI: ffffffff82118a8b RDI: ffff000000000028
RBP: ffff88801dd4c000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff000000000000
R13: 0000000000000000 R14: ffff88801dd4c678 R15: 0000000000000001
FS:  00007f116a35e800(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffdc0000000005 CR3: 0000000020f64000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __ext4_get_inode_loc+0x1c9/0x11a0 fs/ext4/inode.c:4459
 ext4_get_inode_loc+0xba/0x160 fs/ext4/inode.c:4600
 ext4_xattr_ibody_get+0xe4/0x4a0 fs/ext4/xattr.c:602
 ext4_xattr_get+0x166/0x740 fs/ext4/xattr.c:666
 vfs_getxattr_alloc+0x1bc/0x350 fs/xattr.c:384
 ima_read_xattr+0x31/0x70 security/integrity/ima/ima_appraise.c:228
 process_measurement+0xca2/0x18b0 security/integrity/ima/ima_main.c:319
 ima_bprm_check+0xd0/0x220 security/integrity/ima/ima_main.c:492
 security_bprm_check+0x7d/0xa0 security/security.c:870
 search_binary_handler fs/exec.c:1719 [inline]
 exec_binprm fs/exec.c:1772 [inline]
 bprm_execve fs/exec.c:1841 [inline]
 bprm_execve+0x732/0x1960 fs/exec.c:1803
 do_execveat_common+0x727/0x890 fs/exec.c:1946
 do_execve fs/exec.c:2020 [inline]
 __do_sys_execve fs/exec.c:2096 [inline]
 __se_sys_execve fs/exec.c:2091 [inline]
 __x64_sys_execve+0x8f/0xc0 fs/exec.c:2091
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f116a4c8337
Code: ff ff 76 e7 f7 d8 64 41 89 00 eb df 0f 1f 80 00 00 00 00 f7 d8 64 41 89 00 eb dc 0f 1f 84 00 00 00 00 00 b8 3b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 11 1b 0f 00 f7 d8 64 89 01 48
RSP: 002b:00007ffe54ebe008 EFLAGS: 00000206 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 0000564f4f1c5e70 RCX: 00007f116a4c8337
RDX: 0000564f4f1c5e88 RSI: 0000564f4f1c5e70 RDI: 0000564f4f1c5e28
RBP: 0000564f4f1c5e28 R08: 0000564f4f1c5e88 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000206 R12: 0000564f4f1c5e88
R13: 00007f116a66dff4 R14: 0000564f4f1c5e88 R15: 0000000000000000
 </TASK>
Modules linked in:
CR2: ffffdc0000000005
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_get_group_desc+0x231/0x500 fs/ext4/balloc.c:299
Code: 8b e8 e3 12 4d ff 4d 85 e4 0f 84 3d 02 00 00 e8 35 ab 69 ff 49 8d 7c 24 28 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 86 02 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89
RSP: 0018:ffffc900033ff4d8 EFLAGS: 00010a06

RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 1fffe00000000005 RSI: ffffffff82118a8b RDI: ffff000000000028
RBP: ffff88801dd4c000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff000000000000
R13: 0000000000000000 R14: ffff88801dd4c678 R15: 0000000000000001
FS:  00007f116a35e800(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffdc0000000005 CR3: 0000000020f64000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	8b e8                	mov    %eax,%ebp
   2:	e3 12                	jrcxz  0x16
   4:	4d ff 4d 85          	rex.WRB decq -0x7b(%r13)
   8:	e4 0f                	in     $0xf,%al
   a:	84 3d 02 00 00 e8    	test   %bh,-0x17fffffe(%rip)        # 0xe8000012
  10:	35 ab 69 ff 49       	xor    $0x49ff69ab,%eax
  15:	8d 7c 24 28          	lea    0x28(%rsp),%edi
  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:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 86 02 00 00    	jne    0x2ba
  34:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  3b:	fc ff df
  3e:	4c                   	rex.WR
  3f:	89                   	.byte 0x89

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-selinux-root 2022/08/13 02:50 upstream 6c833c0581f1 8dfcaa3d .config log report upstream boot error: BUG: unable to handle kernel paging request in ext4_get_group_desc
* Struck through repros no longer work on HEAD.