syzbot


general protection fault in dir_rename_wrap

Status: upstream: reported C repro on 2024/05/25 07:40
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+20aaf59fe73fa0b87e67@syzkaller.appspotmail.com
First crash: 19d, last: 19d
Bug presence (3)
Date Name Commit Repro Result
2024/05/25 android14-6.1 (ToT) 68c821783c76 C [report] general protection fault in dir_rename_wrap
2024/05/25 lts (merge base) 883d1a956208 C Didn't crash
2024/05/25 upstream (ToT) 56fb6f92854f C Didn't crash
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-54 general protection fault in dir_rename_wrap C 1 10d 24d 0/2 upstream: reported C repro on 2024/05/20 23:47
android-5-10 general protection fault in dir_rename_wrap C 2 11d 25d 0/2 upstream: reported C repro on 2024/05/19 11:46

Sample crash report:
incfs: mount failed -22
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 395 Comm: syz-executor200 Not tainted 6.1.75-syzkaller-00026-g68c821783c76 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:dir_rename fs/incfs/vfs.c:1384 [inline]
RIP: 0010:dir_rename_wrap+0x256/0x720 fs/incfs/vfs.c:91
Code: 4c 8b 3c 24 e9 3e 04 00 00 e8 06 d2 51 ff 31 db 4c 89 6c 24 18 48 83 c3 08 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 ec d0 98 ff 4c 8b 2b 48 8b 5c 24 28
RSP: 0018:ffffc90000f77980 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000f77ab0 R08: ffffffff82239d4d R09: fffff520001eef21
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff11020128d03
R13: 1ffff11020128d05 R14: ffff888100946818 R15: ffff888100946828
FS:  00007fb70f2c76c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb70f345450 CR3: 0000000121416000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 vfs_rename+0xbf9/0xf90 fs/namei.c:4862
 do_renameat2+0xa9b/0x1400 fs/namei.c:5014
 __do_sys_renameat2 fs/namei.c:5047 [inline]
 __se_sys_renameat2 fs/namei.c:5044 [inline]
 __x64_sys_renameat2+0xdd/0xf0 fs/namei.c:5044
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fb70f309789
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb70f2c7218 EFLAGS: 00000246 ORIG_RAX: 000000000000013c
RAX: ffffffffffffffda RBX: 00007fb70f3913c8 RCX: 00007fb70f309789
RDX: 0000000000000004 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 00007fb70f3913c0 R08: 0000000000000002 R09: 0000000000000000
R10: 0000000020000080 R11: 0000000000000246 R12: 00007fb70f35e0c4
R13: 0031656c69662f2e R14: 00007fb70f35e070 R15: 676e69646e65702e
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dir_rename fs/incfs/vfs.c:1384 [inline]
RIP: 0010:dir_rename_wrap+0x256/0x720 fs/incfs/vfs.c:91
Code: 4c 8b 3c 24 e9 3e 04 00 00 e8 06 d2 51 ff 31 db 4c 89 6c 24 18 48 83 c3 08 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 ec d0 98 ff 4c 8b 2b 48 8b 5c 24 28
RSP: 0018:ffffc90000f77980 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000f77ab0 R08: ffffffff82239d4d R09: fffff520001eef21
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff11020128d03
R13: 1ffff11020128d05 R14: ffff888100946818 R15: ffff888100946828
FS:  00007fb70f2c76c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb70f345450 CR3: 0000000121416000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	4c 8b 3c 24          	mov    (%rsp),%r15
   4:	e9 3e 04 00 00       	jmp    0x447
   9:	e8 06 d2 51 ff       	call   0xff51d214
   e:	31 db                	xor    %ebx,%ebx
  10:	4c 89 6c 24 18       	mov    %r13,0x18(%rsp)
  15:	48 83 c3 08          	add    $0x8,%rbx
  19:	48 89 d8             	mov    %rbx,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	48 89 df             	mov    %rbx,%rdi
  33:	e8 ec d0 98 ff       	call   0xff98d124
  38:	4c 8b 2b             	mov    (%rbx),%r13
  3b:	48 8b 5c 24 28       	mov    0x28(%rsp),%rbx

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/25 07:39 android14-6.1 68c821783c76 a10a183e .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in dir_rename_wrap
* Struck through repros no longer work on HEAD.