general protection fault in lmWriteRecord

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision
c42e8b1e	assessment-security	DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	general protection fault in lmWriteRecord	2026/08/28 00:02	2026/08/28 00:02	2026/08/28 00:09	bd6de8ec

Kernel	Title	Rank 🛈	Repro	Fix bisect	Count	Last	Reported	Patched	Status
linux-5.15	general protection fault in lmWriteRecord	2			1	590d	590d	0/3	auto-obsoleted due to no activity on 2025/04/26 22:02
linux-6.1	KASAN: use-after-free Read in lmWriteRecord	19			1	21d	21d	0/3	upstream: reported on 2026/08/09 01:11
linux-6.1	KASAN: slab-out-of-bounds Read in lmWriteRecord	19			2	246d	275d	0/3	auto-obsoleted due to no activity on 2026/04/06 10:48
linux-5.15	KASAN: slab-out-of-bounds Read in lmWriteRecord origin:upstream	19	syz, C	error	5	66d	227d	0/3	upstream: reported C repro on 2026/01/15 07:37

Kernel

Title

Rank 🛈

linux-5.15

general protection fault in lmWriteRecord

590d

0/3

auto-obsoleted due to no activity on 2025/04/26 22:02

linux-6.1

KASAN: use-after-free Read in lmWriteRecord

21d

0/3

upstream: reported on 2026/08/09 01:11

linux-6.1

KASAN: slab-out-of-bounds Read in lmWriteRecord

246d

275d

0/3

auto-obsoleted due to no activity on 2026/04/06 10:48

linux-5.15

KASAN: slab-out-of-bounds Read in lmWriteRecord origin:upstream

syz, C

error

66d

227d

0/3

upstream: reported C repro on 2026/01/15 07:37

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f] CPU: 1 UID: 0 PID: 7107 Comm: syz.1.253 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:lmWriteRecord+0x71/0x1ad0 fs/jfs/jfs_logmgr.c:366 Code: 44 24 50 42 80 3c 38 00 74 08 48 89 df e8 57 d5 cb fe 48 89 5c 24 30 48 8b 03 48 89 44 24 40 48 8d 58 38 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 30 d5 cb fe 4c 89 b4 24 98 00 00 RSP: 0018:ffffc9000b8d7600 EFLAGS: 00010202 RAX: 0000000000000007 RBX: 0000000000000038 RCX: 0000000000080000 RDX: ffffc90012f47000 RSI: 000000000000039f RDI: 00000000000003a0 RBP: 0000000000000100 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1f63b50 R12: ffffc9000b8d7888 R13: ffffc90003831640 R14: ffffc9000b8d7888 R15: dffffc0000000000 FS: 00007fed6dfa46c0(0000) GS:ffff888125cde000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32123ffc CR3: 00000000331ae000 CR4: 00000000003526f0 Call Trace: <TASK> lmLog+0x6dc/0xa10 fs/jfs/jfs_logmgr.c:312 dtLog fs/jfs/jfs_txnmgr.c:1620 [inline] txLog fs/jfs/jfs_txnmgr.c:1402 [inline] txCommit+0x1c92/0x54a0 fs/jfs/jfs_txnmgr.c:1266 add_missing_indices+0x7e5/0xb30 fs/jfs/jfs_dtree.c:2671 jfs_readdir+0x1d15/0x33f0 fs/jfs/jfs_dtree.c:3028 wrap_directory_iterator+0x99/0xe0 fs/readdir.c:67 iterate_dir+0x2f1/0x4e0 fs/readdir.c:110 __do_sys_getdents fs/readdir.c:319 [inline] __se_sys_getdents+0xf1/0x270 fs/readdir.c:304 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fed6fd8e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fed6dfa4028 EFLAGS: 00000246 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 00007fed70016180 RCX: 00007fed6fd8e0d9 RDX: 00000000000000b8 RSI: 0000200000000100 RDI: 0000000000000006 RBP: 00007fed6fe25024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fed70016218 R14: 00007fed70016180 R15: 00007ffe5c81f618 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:lmWriteRecord+0x71/0x1ad0 fs/jfs/jfs_logmgr.c:366 Code: 44 24 50 42 80 3c 38 00 74 08 48 89 df e8 57 d5 cb fe 48 89 5c 24 30 48 8b 03 48 89 44 24 40 48 8d 58 38 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 30 d5 cb fe 4c 89 b4 24 98 00 00 RSP: 0018:ffffc9000b8d7600 EFLAGS: 00010202 RAX: 0000000000000007 RBX: 0000000000000038 RCX: 0000000000080000 RDX: ffffc90012f47000 RSI: 000000000000039f RDI: 00000000000003a0 RBP: 0000000000000100 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1f63b50 R12: ffffc9000b8d7888 R13: ffffc90003831640 R14: ffffc9000b8d7888 R15: dffffc0000000000 FS: 00007fed6dfa46c0(0000) GS:ffff888125cde000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32123ffc CR3: 00000000331ae000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 44 24 50 rex.R and $0x50,%al 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 57 d5 cb fe call 0xfecbd569 12: 48 89 5c 24 30 mov %rbx,0x30(%rsp) 17: 48 8b 03 mov (%rbx),%rax 1a: 48 89 44 24 40 mov %rax,0x40(%rsp) 1f: 48 8d 58 38 lea 0x38(%rax),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 30 d5 cb fe call 0xfecbd569 39: 4c rex.WR 3a: 89 .byte 0x89 3b: b4 24 mov $0x24,%ah 3d: 98 cwtl

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/08/26 09:49	upstream	45c13f3f9e3b	6a91adb4	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-fs	general protection fault in lmWriteRecord

Crashes (1):

Assets (help?)