WARNING in read_rindex_entry

Status: upstream: reported C repro on 2026/08/19 22:49
Subsystems: mm gfs2
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+9d20c3ad7d29227de28d@syzkaller.appspotmail.com
First crash: 6d00h, last: 6d00h
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
3bec2e02 assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ✅ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in read_rindex_entry 2026/08/15 22:39 2026/08/15 22:39 2026/08/15 23:15 746171ee
Discussions (2)
Title Replies (including bot) Last reply
[PATCH] gfs2: valid the length of rgrp header 2 (2) 2026/08/21 12:54
[syzbot] [mm?] [gfs2?] WARNING in read_rindex_entry 3 (6) 2026/08/21 11:37
Last patch testing requests (2)
Created Duration User Patch Repo Result
2026/08/21 11:37 47m agruenba@redhat.com git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git ea31b5336369a76952767f1aa9f81a343de4d4ca no crash job log log
2026/08/20 01:24 2h35m eadavis@qq.com patch upstream OK job log log
Cause bisection attempts (1)
Created Duration User Patch Repo Result
2026/08/16 22:56 0m bisect upstream error

Sample crash report:
gfs2: fsid=.: Now mounting FS (format 1801)...
gfs2: fsid=..0: journal 0 mapped with 18 extents in 0ms
gfs2: fsid=..0: first mount done, others may mount
------------[ cut here ]------------
1
WARNING: mm/page_alloc.c:5280 at __alloc_frozen_pages_noprof+0x2427/0x2dc0 mm/page_alloc.c:5280, CPU#1: syz-executor256/5629
Modules linked in:
CPU: 1 UID: 0 PID: 5629 Comm: syz-executor256 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:__alloc_frozen_pages_noprof+0x2427/0x2dc0 mm/page_alloc.c:5280
Code: e9 8d fb ff ff 31 d2 be 28 12 00 00 48 c7 c7 a0 64 e1 8b e8 5b 8c 69 ff 2e 2e 2e 31 c0 e9 02 ed ff ff c6 05 54 c1 9d 0e 01 90 <0f> 0b 90 e9 6f df ff ff 48 c7 c7 80 ae d3 8e 45 89 f7 44 8b 74 24
RSP: 0018:ffffc9000345f0e0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 1ffff9200068be36 RDI: 0000000000040d40
RBP: 000000000000000b R08: 0000000000000005 R09: 0000000000000009
R10: 000000000000000b R11: 0000000000000000 R12: 0000000000040d40
R13: 1ffff9200068be74 R14: ffffffff9b759444 R15: 0000000000000001
FS:  000055556d263400(0000) GS:ffff888123ee1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055886dbe9978 CR3: 000000003394d000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
 ___kmalloc_large_node+0xe5/0x120 mm/slub.c:5274
 __kmalloc_large_node_noprof+0x1c/0x70 mm/slub.c:5305
 __do_kmalloc_node mm/slub.c:5322 [inline]
 __kmalloc_noprof+0x5a1/0x820 mm/slub.c:5359
 _kmalloc_noprof include/linux/slab.h:992 [inline]
 _kzalloc_noprof include/linux/slab.h:1309 [inline]
 compute_bitstructs fs/gfs2/rgrp.c:766 [inline]
 read_rindex_entry+0x4a1/0x1250 fs/gfs2/rgrp.c:931
 gfs2_ri_update+0x6f/0x3b0 fs/gfs2/rgrp.c:1001
 gfs2_rindex_update+0x40b/0x480 fs/gfs2/rgrp.c:1051
 init_inodes+0x1f78/0x2790 fs/gfs2/ops_fstype.c:872
 gfs2_fill_super+0x1d3d/0x2cf0 fs/gfs2/ops_fstype.c:1250
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1640
 gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1332
 vfs_get_tree+0x92/0x320 fs/super.c:1700
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3765 [inline]
 do_new_mount fs/namespace.c:3841 [inline]
 path_mount+0x7d0/0x23d0 fs/namespace.c:4161
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount fs/namespace.c:4367 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff9e8de99ea
Code: 56 53 b8 9d 00 00 00 0f 05 83 f8 ea 75 a2 c7 05 a4 30 0a 00 00 00 00 00 eb 96 e8 51 05 00 00 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc770eecc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc770eece0 RCX: 00007ff9e8de99ea
RDX: 0000200000000040 RSI: 0000200000000100 RDI: 00007ffc770eece0
RBP: 0000200000000100 R08: 00007ffc770eed20 R09: 0000000000000000
R10: 0000000000008cd3 R11: 0000000000000246 R12: 0000200000000040
R13: 0000000000000004 R14: 0000000000000003 R15: 00007ffc770eed20
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/15 22:39 upstream 15ef2f78c49d 746171ee .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-kasan-badwrites-root WARNING in read_rindex_entry
* Struck through repros no longer work on HEAD.