syzbot


general protection fault in do_renameat2

Status: upstream: reported C repro on 2023/09/24 22:41
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+3983560c9946a34ea12c@syzkaller.appspotmail.com
First crash: 219d, last: 14d
Bug presence (3)
Date Name Commit Repro Result
2023/09/24 android13-5.15-lts (ToT) ea586874d2f9 C [report] general protection fault in do_renameat2
2023/09/24 lts (merge base) aff03380bda4 C Didn't crash
2023/09/24 upstream (ToT) 6465e260f487 C Didn't crash
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-10 general protection fault in do_renameat2 C 12 1h29m 212d 0/2 upstream: reported C repro on 2023/09/15 06:30
android-6-1 general protection fault in do_renameat2 origin:downstream C done 6 6h11m 210d 0/2 upstream: reported C repro on 2023/09/17 05:40
Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/03/10 22:24 5m retest repro android13-5.15-lts report log
Fix bisection attempts (4)
Created Duration User Patch Repo Result
2024/02/03 08:17 32m bisect fix android13-5.15-lts job log (0) log
2023/12/31 13:55 37m bisect fix android13-5.15-lts job log (0) log
2023/12/01 07:42 35m bisect fix android13-5.15-lts job log (0) log
2023/10/31 11:46 52m bisect fix android13-5.15-lts job log (0) log

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 298 Comm: syz-executor287 Not tainted 5.15.148-syzkaller-00718-g993bed180178 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:__d_entry_type include/linux/dcache.h:404 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:409 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:455 [inline]
RIP: 0010:do_renameat2+0x677/0x1400 fs/namei.c:4919
Code: 89 f2 e8 dc f1 fe ff 48 89 c3 48 3d 01 f0 ff ff 72 11 e8 9c 0c b2 ff 41 89 de 48 8b 1c 24 e9 63 05 00 00 49 89 de 49 c1 ee 03 <43> 0f b6 04 26 84 c0 0f 85 6e 07 00 00 48 89 5c 24 30 8b 1b be 00
RSP: 0018:ffffc900009e7c40 EFLAGS: 00010246
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffff88811e36a780
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000
RBP: ffffc900009e7ef8 R08: ffffffff81c04f00 R09: ffffed10238272d8
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff8881001c01e0 R14: 0000000000000000 R15: ffff88811c139690
FS:  00007f3698f3e6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2a51019308 CR3: 000000011e217000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __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: 0033:0x7f3698f9d479
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:00007f3698f3e218 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f369902a3f8 RCX: 00007f3698f9d479
RDX: 00007f3698f9d479 RSI: 0000000020000140 RDI: 0000000020000100
RBP: 00007f369902a3f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3698ff701c
R13: 00007f3698ff7038 R14: 00007ffcdef6fa10 R15: 0030656c69662f30
 </TASK>
Modules linked in:
---[ end trace 3cce31a358b5a5b1 ]---
RIP: 0010:__d_entry_type include/linux/dcache.h:404 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:409 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:455 [inline]
RIP: 0010:do_renameat2+0x677/0x1400 fs/namei.c:4919
Code: 89 f2 e8 dc f1 fe ff 48 89 c3 48 3d 01 f0 ff ff 72 11 e8 9c 0c b2 ff 41 89 de 48 8b 1c 24 e9 63 05 00 00 49 89 de 49 c1 ee 03 <43> 0f b6 04 26 84 c0 0f 85 6e 07 00 00 48 89 5c 24 30 8b 1b be 00
RSP: 0018:ffffc900009e7c40 EFLAGS: 00010246
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffff88811e36a780
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000
RBP: ffffc900009e7ef8 R08: ffffffff81c04f00 R09: ffffed10238272d8
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff8881001c01e0 R14: 0000000000000000 R15: ffff88811c139690
FS:  00007f3698f3e6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcdef95020 CR3: 000000011e217000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	89 f2                	mov    %esi,%edx
   2:	e8 dc f1 fe ff       	call   0xfffef1e3
   7:	48 89 c3             	mov    %rax,%rbx
   a:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
  10:	72 11                	jb     0x23
  12:	e8 9c 0c b2 ff       	call   0xffb20cb3
  17:	41 89 de             	mov    %ebx,%r14d
  1a:	48 8b 1c 24          	mov    (%rsp),%rbx
  1e:	e9 63 05 00 00       	jmp    0x586
  23:	49 89 de             	mov    %rbx,%r14
  26:	49 c1 ee 03          	shr    $0x3,%r14
* 2a:	43 0f b6 04 26       	movzbl (%r14,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 6e 07 00 00    	jne    0x7a5
  37:	48 89 5c 24 30       	mov    %rbx,0x30(%rsp)
  3c:	8b 1b                	mov    (%rbx),%ebx
  3e:	be                   	.byte 0xbe

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/02/25 22:21 android13-5.15-lts 993bed180178 8d446f15 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in do_renameat2
2023/09/24 22:32 android13-5.15-lts ea586874d2f9 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in do_renameat2
2024/03/31 15:10 android13-5.15-lts 993bed180178 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in do_renameat2
2024/03/28 03:56 android13-5.15-lts 993bed180178 120789fd .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in do_renameat2
2024/03/25 10:05 android13-5.15-lts 993bed180178 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in do_renameat2
2024/03/16 18:05 android13-5.15-lts 993bed180178 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in do_renameat2
2023/10/01 00:55 android13-5.15-lts ea586874d2f9 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in do_renameat2
2023/09/08 09:35 android13-5.15-lts ea586874d2f9 72324844 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in do_renameat2
* Struck through repros no longer work on HEAD.