syzbot


general protection fault in vfs_rename

Status: upstream: reported C repro on 2023/10/15 16:52
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+a80f1dcaba9e162cda54@syzkaller.appspotmail.com
First crash: 278d, last: 8d01h
Bug presence (3)
Date Name Commit Repro Result
2023/10/15 android13-5.15-lts (ToT) 754f8cc9b7de C [report] general protection fault in vfs_rename
2023/10/15 lts (merge base) 35ecaa3632bf C Didn't crash
2023/10/15 upstream (ToT) 11d3f7261395 C Didn't crash
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-10 general protection fault in vfs_rename C inconclusive 10 7d11h 278d 0/2 upstream: reported C repro on 2023/10/15 16:27
android-6-1 general protection fault in vfs_rename origin:downstream C done 8 2d01h 272d 0/2 upstream: reported C repro on 2023/10/22 15:59
upstream BUG: unable to handle kernel paging request in vfs_rename overlayfs 6 528d 530d 0/27 auto-obsoleted due to no activity on 2023/06/08 14:12
Last patch testing requests (3)
Created Duration User Patch Repo Result
2024/07/12 14:23 5m retest repro android13-5.15-lts report log
2024/05/17 14:14 8m retest repro android13-5.15-lts report log
2024/04/02 15:15 7m retest repro android13-5.15-lts report log
Fix bisection attempts (5)
Created Duration User Patch Repo Result
2024/05/03 11:56 2h05m bisect fix android13-5.15-lts OK (0) job log log
2024/02/23 23:57 35m bisect fix android13-5.15-lts OK (0) job log log
2024/01/15 03:05 33m bisect fix android13-5.15-lts OK (0) job log log
2023/12/15 11:40 38m bisect fix android13-5.15-lts OK (0) job log log
2023/11/14 21:58 53m bisect fix android13-5.15-lts OK (0) job log log

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
CPU: 1 PID: 296 Comm: syz-executor390 Not tainted 5.15.148-syzkaller-00718-g993bed180178 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:vfs_rename+0x1a8/0xf90 fs/namei.c:4726
Code: c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 00 36 f4 ff 48 8b 03 48 89 44 24 58 4c 89 6c 24 18 4d 8d 75 30 4d 89 f5 49 c1 ed 03 <43> 80 7c 3d 00 00 74 08 4c 89 f7 e8 d8 35 f4 ff 49 8b 06 48 89 44
RSP: 0018:ffffc900009b7ae0 EFLAGS: 00010203
RAX: ffff88810fab0000 RBX: ffff88811b57a030 RCX: ffffc900009b7e80
RDX: ffff88811e9c4f00 RSI: 0000000000400000 RDI: 0000000000200000
RBP: ffffc900009b7c30 R08: ffffffff81bdfc01 R09: ffffed102369f02e
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88810fb74480
R13: 0000000000000007 R14: 000000000000003c R15: dffffc0000000000
FS:  00007f05c8e556c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020007000 CR3: 000000011e810000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_renameat2+0xa9b/0x1400 fs/namei.c:4971
 __do_sys_rename fs/namei.c:5017 [inline]
 __se_sys_rename fs/namei.c:5015 [inline]
 __x64_sys_rename+0x86/0x90 fs/namei.c:5015
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f05c8ed5939
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 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:00007f05c8e55218 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f05c8f66408 RCX: 00007f05c8ed5939
RDX: 00007f05c8eb30a6 RSI: 0000000020000140 RDI: 0000000020000100
RBP: 00007f05c8f66400 R08: 00007ffe99b47be7 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f05c8f330a4
R13: 000000000000006e R14: 0030656c69662f30 R15: 00007f05c8f310a0
 </TASK>
Modules linked in:
---[ end trace b46954b0e616de18 ]---
RIP: 0010:vfs_rename+0x1a8/0xf90 fs/namei.c:4726
Code: c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 00 36 f4 ff 48 8b 03 48 89 44 24 58 4c 89 6c 24 18 4d 8d 75 30 4d 89 f5 49 c1 ed 03 <43> 80 7c 3d 00 00 74 08 4c 89 f7 e8 d8 35 f4 ff 49 8b 06 48 89 44
RSP: 0018:ffffc900009b7ae0 EFLAGS: 00010203
RAX: ffff88810fab0000 RBX: ffff88811b57a030 RCX: ffffc900009b7e80
RDX: ffff88811e9c4f00 RSI: 0000000000400000 RDI: 0000000000200000
RBP: ffffc900009b7c30 R08: ffffffff81bdfc01 R09: ffffed102369f02e
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88810fb74480
R13: 0000000000000007 R14: 000000000000003c R15: dffffc0000000000
FS:  00007f05c8e556c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f05c8e76d58 CR3: 000000011e810000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c1 e8 03             	shr    $0x3,%eax
   3:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
   8:	74 08                	je     0x12
   a:	48 89 df             	mov    %rbx,%rdi
   d:	e8 00 36 f4 ff       	call   0xfff43612
  12:	48 8b 03             	mov    (%rbx),%rax
  15:	48 89 44 24 58       	mov    %rax,0x58(%rsp)
  1a:	4c 89 6c 24 18       	mov    %r13,0x18(%rsp)
  1f:	4d 8d 75 30          	lea    0x30(%r13),%r14
  23:	4d 89 f5             	mov    %r14,%r13
  26:	49 c1 ed 03          	shr    $0x3,%r13
* 2a:	43 80 7c 3d 00 00    	cmpb   $0x0,0x0(%r13,%r15,1) <-- trapping instruction
  30:	74 08                	je     0x3a
  32:	4c 89 f7             	mov    %r14,%rdi
  35:	e8 d8 35 f4 ff       	call   0xfff43612
  3a:	49 8b 06             	mov    (%r14),%rax
  3d:	48                   	rex.W
  3e:	89                   	.byte 0x89
  3f:	44                   	rex.R

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/19 14:11 android13-5.15-lts 993bed180178 e104824c .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in vfs_rename
2023/10/15 16:50 android13-5.15-lts 754f8cc9b7de f757a323 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in vfs_rename
2024/06/27 23:04 android13-5.15-lts 9044d25b8ff5 6ef39602 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in vfs_rename
2024/06/27 23:04 android13-5.15-lts 9044d25b8ff5 6ef39602 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in vfs_rename
2024/05/27 16:44 android13-5.15-lts 424f92bcbe8f 761766e6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in vfs_rename
2024/05/27 07:13 android13-5.15-lts 424f92bcbe8f a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in vfs_rename
* Struck through repros no longer work on HEAD.