[syzbot] [jfs?] general protection fault in txCommit (2)

[syzbot] [jfs?] general protection fault in txCommit (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    8bb886cb8f3a Merge tag 'edac_urgent_for_v6.18_rc5' of git:..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1207c114580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833
dashboard link: https://syzkaller.appspot.com/bug?extid=9489c9f9f3d437221ea2
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1033d012580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11ea1bcd980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/393661e2054b/disk-8bb886cb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ba628b757c6a/vmlinux-8bb886cb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/15255c2cc8ad/bzImage-8bb886cb.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/5ffcac92a4cf/mount_0.gz
  fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=125bf932580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9489c9f9f3d437221ea2@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
UFO tlock:0xffffc900034fa[  113.512606][ T5985] UFO tlock:0xffffc900034fa1b0
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 0 UID: 0 PID: 5985 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:txLog fs/jfs/jfs_txnmgr.c:1390 [inline]
RIP: 0010:txCommit+0xafb/0x5430 fs/jfs/jfs_txnmgr.c:1265
Code: 3c 10 00 74 12 4c 89 f7 e8 f2 cb e2 fe 48 ba 00 00 00 00 00 fc ff df 4c 89 74 24 68 4d 8b 36 4d 8d 7e 28 4c 89 f8 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 ff e8 c7 cb e2 fe 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc90003fc74e0 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000948 RCX: 1ffff9200069fd48
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003fc76b0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1dac5ef R12: 0000000000000002
R13: ffffc900034fa000 R14: 0000000000000000 R15: 0000000000000028
FS:  0000555570e52500(0000) GS:ffff888126df9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000038f28000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 jfs_create+0x865/0xa80 fs/jfs/namei.c:156
 lookup_open fs/namei.c:3796 [inline]
 open_last_lookups fs/namei.c:3895 [inline]
 path_openat+0x1500/0x3840 fs/namei.c:4131
 do_filp_open+0x1fa/0x410 fs/namei.c:4161
 do_sys_openat2+0x121/0x1c0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_creat fs/open.c:1530 [inline]
 __se_sys_creat fs/open.c:1524 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1524
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f575dbcf6c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff260cfb28 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f575de25fa0 RCX: 00007f575dbcf6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000580
RBP: 00007f575dc51f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f575de25fa0 R14: 00007f575de25fa0 R15: 0000000000000002
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txLog fs/jfs/jfs_txnmgr.c:1390 [inline]
RIP: 0010:txCommit+0xafb/0x5430 fs/jfs/jfs_txnmgr.c:1265
Code: 3c 10 00 74 12 4c 89 f7 e8 f2 cb e2 fe 48 ba 00 00 00 00 00 fc ff df 4c 89 74 24 68 4d 8b 36 4d 8d 7e 28 4c 89 f8 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 ff e8 c7 cb e2 fe 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc90003fc74e0 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000948 RCX: 1ffff9200069fd48
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003fc76b0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1dac5ef R12: 0000000000000002
R13: ffffc900034fa000 R14: 0000000000000000 R15: 0000000000000028
FS:  0000555570e52500(0000) GS:ffff888126df9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000038f28000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	3c 10                	cmp    $0x10,%al
   2:	00 74 12 4c          	add    %dh,0x4c(%rdx,%rdx,1)
   6:	89 f7                	mov    %esi,%edi
   8:	e8 f2 cb e2 fe       	call   0xfee2cbff
   d:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  14:	fc ff df
  17:	4c 89 74 24 68       	mov    %r14,0x68(%rsp)
  1c:	4d 8b 36             	mov    (%r14),%r14
  1f:	4d 8d 7e 28          	lea    0x28(%r14),%r15
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 10 00          	cmpb   $0x0,(%rax,%rdx,1) <-- trapping instruction
  2e:	74 12                	je     0x42
  30:	4c 89 ff             	mov    %r15,%rdi
  33:	e8 c7 cb e2 fe       	call   0xfee2cbff
  38:	48                   	rex.W
  39:	ba 00 00 00 00       	mov    $0x0,%edx
  3e:	00 fc                	add    %bh,%ah


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Re: [syzbot] [jfs?] general protection fault in txCommit (2)

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to apply patch:
checking file fs/jfs/jfs_txnmgr.c
Hunk #1 FAILED at 1073.
1 out of 1 hunk FAILED



Tested on:

commit:         e811c33b Merge tag 'drm-fixes-2025-11-08' of https://g..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833
dashboard link: https://syzkaller.appspot.com/bug?extid=9489c9f9f3d437221ea2
compiler:       
patch:          https://syzkaller.appspot.com/x/patch.diff?x=177f4412580000

Re: [syzbot] [jfs?] general protection fault in txCommit (2)

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
UBSAN: array-index-out-of-bounds in dtInsertEntry

loop0: detected capacity change from 0 to 32768
UFO tlock:0xffffc900034f91f8
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:3700:8
index -1 is out of range for type 'struct dtslot[128]'
CPU: 1 UID: 0 PID: 6705 Comm: syz.0.55 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x40 lib/ubsan.c:233
 __ubsan_handle_out_of_bounds+0xe9/0xf0 lib/ubsan.c:455
 dtInsertEntry+0x936/0x1430 fs/jfs/jfs_dtree.c:3700
 dtInsert+0x931/0x5f40 fs/jfs/jfs_dtree.c:894
 jfs_create+0x6c8/0xa80 fs/jfs/namei.c:137
 lookup_open fs/namei.c:3796 [inline]
 open_last_lookups fs/namei.c:3895 [inline]
 path_openat+0x1500/0x3840 fs/namei.c:4131
 do_filp_open+0x1fa/0x410 fs/namei.c:4161
 do_sys_openat2+0x121/0x1c0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_creat fs/open.c:1530 [inline]
 __se_sys_creat fs/open.c:1524 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1524
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f67e06af6c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f67dfd16038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f67e0905fa0 RCX: 00007f67e06af6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000580
RBP: 00007f67e0731f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f67e0906038 R14: 00007f67e0905fa0 R15: 00007fff0aaff588
 </TASK>
---[ end trace ]---


Tested on:

commit:         e811c33b Merge tag 'drm-fixes-2025-11-08' of https://g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11cf0b42580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833
dashboard link: https://syzkaller.appspot.com/bug?extid=9489c9f9f3d437221ea2
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=17eaaa92580000

Re: [syzbot] [jfs?] general protection fault in txCommit (2)

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
UBSAN: array-index-out-of-bounds in dtInsertEntry

loop0: detected capacity change from 0 to 32768
UFO tlock:0xffffc900034d11f8
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:3707:8
index -1 is out of range for type 'struct dtslot[128]'
CPU: 0 UID: 0 PID: 6833 Comm: syz.0.56 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x40 lib/ubsan.c:233
 __ubsan_handle_out_of_bounds+0xe9/0xf0 lib/ubsan.c:455
 dtInsertEntry+0x936/0x1430 fs/jfs/jfs_dtree.c:3707
 dtInsert+0x931/0x6000 fs/jfs/jfs_dtree.c:894
 jfs_create+0x6c8/0xa80 fs/jfs/namei.c:137
 lookup_open fs/namei.c:3796 [inline]
 open_last_lookups fs/namei.c:3895 [inline]
 path_openat+0x1500/0x3840 fs/namei.c:4131
 do_filp_open+0x1fa/0x410 fs/namei.c:4161
 do_sys_openat2+0x121/0x1c0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_creat fs/open.c:1530 [inline]
 __se_sys_creat fs/open.c:1524 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1524
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc0cd3bf6c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc0cca2e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007fc0cd615fa0 RCX: 00007fc0cd3bf6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000580
RBP: 00007fc0cd441f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc0cd616038 R14: 00007fc0cd615fa0 R15: 00007ffc096fa2d8
 </TASK>
---[ end trace ]---


Tested on:

commit:         e9a6fb0b Linux 6.18-rc5
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=108a1a92580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833
dashboard link: https://syzkaller.appspot.com/bug?extid=9489c9f9f3d437221ea2
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=13df260a580000

Re: [syzbot] [jfs?] general protection fault in txCommit (2)

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
UBSAN: array-index-out-of-bounds in dtInsertEntry

loop0: detected capacity change from 0 to 32768
UFO tlock:0xffffc900034f9048
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:3707:8
index -1 is out of range for type 'struct dtslot[128]'
CPU: 0 UID: 0 PID: 6833 Comm: syz.0.58 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x40 lib/ubsan.c:233
 __ubsan_handle_out_of_bounds+0xe9/0xf0 lib/ubsan.c:455
 dtInsertEntry+0x936/0x1430 fs/jfs/jfs_dtree.c:3707
 dtInsert+0x931/0x6000 fs/jfs/jfs_dtree.c:894
 jfs_create+0x6c8/0xa80 fs/jfs/namei.c:137
 lookup_open fs/namei.c:3796 [inline]
 open_last_lookups fs/namei.c:3895 [inline]
 path_openat+0x1500/0x3840 fs/namei.c:4131
 do_filp_open+0x1fa/0x410 fs/namei.c:4161
 do_sys_openat2+0x121/0x1c0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_creat fs/open.c:1530 [inline]
 __se_sys_creat fs/open.c:1524 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1524
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2c965f6c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa2c8cce038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007fa2c98b5fa0 RCX: 00007fa2c965f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000580
RBP: 00007fa2c96e1f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa2c98b6038 R14: 00007fa2c98b5fa0 R15: 00007ffe646c1968
 </TASK>
---[ end trace ]---


Tested on:

commit:         e9a6fb0b Linux 6.18-rc5
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17265412580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833
dashboard link: https://syzkaller.appspot.com/bug?extid=9489c9f9f3d437221ea2
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=11bbb084580000

Re: [syzbot] [jfs?] general protection fault in txCommit (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+9489c9f9f3d437221ea2@syzkaller.appspotmail.com
Tested-by: syzbot+9489c9f9f3d437221ea2@syzkaller.appspotmail.com

Tested on:

commit:         6da43bbe Merge tag 'vfio-v6.18-rc6' of https://github...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=126bb60a580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833
dashboard link: https://syzkaller.appspot.com/bug?extid=9489c9f9f3d437221ea2
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=133db532580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [jfs?] general protection fault in txCommit (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+9489c9f9f3d437221ea2@syzkaller.appspotmail.com
Tested-by: syzbot+9489c9f9f3d437221ea2@syzkaller.appspotmail.com

Tested on:

commit:         6da43bbe Merge tag 'vfio-v6.18-rc6' of https://github...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1187bc12580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833
dashboard link: https://syzkaller.appspot.com/bug?extid=9489c9f9f3d437221ea2
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=13cbb60a580000

Note: testing is done by a robot and is best-effort only.