WARNING in blk_validate_limits

Status: upstream: reported syz repro on 2026/08/08 20:10
Subsystems: block
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+ac00e7bf7ac8c91af921@syzkaller.appspotmail.com
First crash: 2d22h, last: 6h06m
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
5162d7c1 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in blk_validate_limits 2026/08/09 01:33 2026/08/09 01:33 2026/08/09 02:18 5d63f80b
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [block?] WARNING in blk_validate_limits 0 (1) 2026/08/08 20:10

Sample crash report:
F2FS-fs (loop0): f2fs_disable_checkpoint: call f2fs_write_checkpoint(), meta: 0, node: 0, data: 0
F2FS-fs (loop0): Start checkpoint disabled!
F2FS-fs (loop0): f2fs_disable_checkpoint finishes, err:0
F2FS-fs (loop0): Mounted with checkpoint version = 48b305e6
------------[ cut here ]------------
lim->dma_alignment > PAGE_SIZE
WARNING: block/blk-settings.c:497 at blk_validate_limits+0x1676/0x2270 block/blk-settings.c:497, CPU#0: syz.0.17/5832
Modules linked in:
CPU: 0 UID: 0 PID: 5832 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:blk_validate_limits+0x1676/0x2270 block/blk-settings.c:497
Code: e8 ef 7e 11 fd 90 0f 0b 90 eb 8f e8 e4 7e 11 fd 90 0f 0b 90 eb 84 e8 d9 7e 11 fd 90 0f 0b 90 e9 76 ff ff ff e8 cb 7e 11 fd 90 <0f> 0b 90 e9 68 ff ff ff e8 bd 7e 11 fd 90 0f 0b 90 e9 81 00 00 00
RSP: 0018:ffffc90003b2ee60 EFLAGS: 00010293
RAX: ffffffff84b60635 RBX: ffffc90003b2f0f0 RCX: ffff888032388000
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000001000
RBP: 00000000ffffffff R08: ffff8880580ddd1f R09: 1ffff1100b01bba3
R10: dffffc0000000000 R11: ffffed100b01bba4 R12: ffffc90003b2f040
R13: dffffc0000000000 R14: 1ffff92000765e1e R15: dffffc0000000000
FS:  000055558839e500(0000) GS:ffff888124f0c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f518a78dd30 CR3: 000000007ff22000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 queue_limits_commit_update+0x87/0x390 block/blk-settings.c:552
 loop_configure+0x7f1/0xdc0 drivers/block/loop.c:1086
 lo_ioctl+0xad5/0x2150 drivers/block/loop.c:1564
 blkdev_ioctl+0x5e3/0x740 block/ioctl.c:798
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x510 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fac8cb9e0d9
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:00007ffc2306ebe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fac8ce25fa0 RCX: 00007fac8cb9e0d9
RDX: 00002000000005c0 RSI: 0000000000004c0a RDI: 0000000000000003
RBP: 00007fac8cc35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fac8ce25fac R14: 00007fac8ce25fa0 R15: 00007fac8ce25fa0
 </TASK>

Crashes (23):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/08 23:16 linux-next 6b8c8af514d7 5d63f80b .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/08 22:01 linux-next 6b8c8af514d7 5d63f80b .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/08 20:43 linux-next 6b8c8af514d7 5d63f80b .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/08 19:22 linux-next 6b8c8af514d7 5d63f80b .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/07 09:43 linux-next 1701fda2f58e c38879ea .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/07 08:55 linux-next 1701fda2f58e c38879ea .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/07 08:17 linux-next 1701fda2f58e c38879ea .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/07 07:40 linux-next 1701fda2f58e c38879ea .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/07 06:24 linux-next 1701fda2f58e c38879ea .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/09 12:12 linux-next 6b8c8af514d7 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/08 18:11 linux-next 6b8c8af514d7 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/08 18:10 linux-next 6b8c8af514d7 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/08 18:08 linux-next 6b8c8af514d7 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/08 18:05 linux-next 6b8c8af514d7 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/08 18:03 linux-next 6b8c8af514d7 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/07 04:22 linux-next 1701fda2f58e c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/07 04:21 linux-next 1701fda2f58e c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/07 01:17 linux-next 1701fda2f58e c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/06 21:58 linux-next 1701fda2f58e c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/06 20:00 linux-next 1701fda2f58e c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/06 19:59 linux-next 1701fda2f58e c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/06 19:59 linux-next 1701fda2f58e c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/06 19:59 linux-next 1701fda2f58e c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
* Struck through repros no longer work on HEAD.