syzbot


general protection fault in txEnd

Status: upstream: reported C repro on 2022/12/23 23:37
Labels: jfs (incorrect?)
Reported-by: syzbot+1d096d31de6a0491b55e@syzkaller.appspotmail.com
First crash: 160d, last: 7d05h

Cause bisection: failed (error log, bisect log)
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [jfs?] [fat?] general protection fault in txEnd 1 (2) 2023/03/30 10:03
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 general protection fault in txEnd jfs fat C 1 85d 152d 0/1 upstream: reported C repro on 2022/12/27 07:15
Fix bisection attempts (3)
Created Duration User Patch Repo Result
2023/05/21 20:24 24m bisect fix upstream job log (0) log
2023/04/21 04:00 52m bisect fix upstream job log (0) log
2023/03/21 23:15 26m bisect fix upstream job log (0) log

Sample crash report:
read_mapping_page failed!
ERROR: (device loop0): txAbort: 
general protection fault, probably for non-canonical address 0xdffffc0000000029: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000148-0x000000000000014f]
CPU: 0 PID: 5097 Comm: syz-executor839 Not tainted 6.2.0-rc5-syzkaller-00047-g7c46948a6e9c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
RIP: 0010:txEnd+0x21d/0x4c0 fs/jfs/jfs_txnmgr.c:534
Code: eb 0e 45 0f b7 ed 49 8d bc 24 4c 01 00 00 44 89 2d f8 63 eb 0e 48 89 fa 48 c1 ea 03 66 89 43 28 48 b8 00 00 00 00 00 fc ff df <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 30
RSP: 0018:ffffc90003f4fb18 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: ffffc90002671110 RCX: 0000000000000000
RDX: 0000000000000029 RSI: ffffffff82e8496f RDI: 000000000000014c
RBP: ffffffff8cccdde0 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000005 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000000 R15: ffffc90002671112
FS:  00007f1d980a1700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1d980a1718 CR3: 0000000076595000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 add_missing_indices fs/jfs/jfs_dtree.c:2658 [inline]
 jfs_readdir+0x2865/0x4230 fs/jfs/jfs_dtree.c:3004
 iterate_dir+0x1fd/0x6f0 fs/readdir.c:67
 __do_sys_getdents fs/readdir.c:286 [inline]
 __se_sys_getdents fs/readdir.c:271 [inline]
 __x64_sys_getdents+0x13e/0x2c0 fs/readdir.c:271
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f1d9f516729
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 15 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1d980a12f8 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007f1d9f5a17b0 RCX: 00007f1d9f516729
RDX: 000000000000004c RSI: 0000000020000100 RDI: 0000000000000004
RBP: 0030656c69662f2e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 61746f7571727375
R13: 726765746e696f6e R14: 7261637369646f6e R15: 00007f1d9f5a17b8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txEnd+0x21d/0x4c0 fs/jfs/jfs_txnmgr.c:534
Code: eb 0e 45 0f b7 ed 49 8d bc 24 4c 01 00 00 44 89 2d f8 63 eb 0e 48 89 fa 48 c1 ea 03 66 89 43 28 48 b8 00 00 00 00 00 fc ff df <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 30
RSP: 0018:ffffc90003f4fb18 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: ffffc90002671110 RCX: 0000000000000000
RDX: 0000000000000029 RSI: ffffffff82e8496f RDI: 000000000000014c
RBP: ffffffff8cccdde0 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000005 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000000 R15: ffffc90002671112
FS:  00007f1d980a1700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1d980a1718 CR3: 0000000076595000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	eb 0e                	jmp    0x10
   2:	45 0f b7 ed          	movzwl %r13w,%r13d
   6:	49 8d bc 24 4c 01 00 	lea    0x14c(%r12),%rdi
   d:	00
   e:	44 89 2d f8 63 eb 0e 	mov    %r13d,0xeeb63f8(%rip)        # 0xeeb640d
  15:	48 89 fa             	mov    %rdi,%rdx
  18:	48 c1 ea 03          	shr    $0x3,%rdx
  1c:	66 89 43 28          	mov    %ax,0x28(%rbx)
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx <-- trapping instruction
  2e:	48 89 f8             	mov    %rdi,%rax
  31:	83 e0 07             	and    $0x7,%eax
  34:	83 c0 03             	add    $0x3,%eax
  37:	38 d0                	cmp    %dl,%al
  39:	7c 08                	jl     0x43
  3b:	84 d2                	test   %dl,%dl
  3d:	0f                   	.byte 0xf
  3e:	85 30                	test   %esi,(%rax)

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Manager Title
2023/01/27 16:47 upstream 7c46948a6e9c 9dfcf09c .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-root general protection fault in txEnd
2022/12/19 23:27 upstream aeba12b26c79 c52b2efb .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs general protection fault in txEnd
2023/02/19 21:53 linux-next c068f40300a0 bcdf85f8 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root general protection fault in txEnd
* Struck through repros no longer work on HEAD.