WARNING in blk_validate_limits

Status: upstream: reported C repro on 2026/08/08 20:10
Subsystems: f2fs block
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+ac00e7bf7ac8c91af921@syzkaller.appspotmail.com
Fix commit: e52349a5ea6a loop, zloop: fix dma_alignment for large or unreported limits
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-upstream ci-qemu-upstream-386 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu-native-arm64-kvm ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-upstream-gce-arm64 ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root]
First crash: 36d, last: 2d11h
✨ 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 (2)
Title Replies (including bot) Last reply
[PATCH] loop, zloop: fix dma_alignment for large or unreported limits 3 (3) 2026/09/01 14:44
[syzbot] [block?] WARNING in blk_validate_limits 0 (2) 2026/08/30 05:08
Cause bisection attempts (1)
Created Duration User Patch Repo Result
2026/09/02 02:48 0m bisect linux-next error

Sample crash report:
F2FS-fs (loop0): f2fs_disable_checkpoint finishes, err:0
F2FS-fs (loop0): Mounted with checkpoint version = 48b305e6
fscrypt: AES-256-XTS using blk-crypto-fallback
------------[ 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#1: syz-executor215/5627
Modules linked in:
CPU: 1 UID: 0 PID: 5627 Comm: syz-executor215 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 cf da 0b fd 90 0f 0b 90 eb 8f e8 c4 da 0b fd 90 0f 0b 90 eb 84 e8 b9 da 0b fd 90 0f 0b 90 e9 76 ff ff ff e8 ab da 0b fd 90 <0f> 0b 90 e9 68 ff ff ff e8 9d da 0b fd 90 0f 0b 90 e9 81 00 00 00
RSP: 0018:ffffc900038dee60 EFLAGS: 00010293
RAX: ffffffff84bbe625 RBX: ffffc900038df0f0 RCX: ffff888076f99f40
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000001000
RBP: 00000000ffffffff R08: ffff88806ec9427f R09: 1ffff1100dd9284f
R10: dffffc0000000000 R11: ffffed100dd92850 R12: ffffc900038df040
R13: dffffc0000000000 R14: 1ffff9200071be1e R15: dffffc0000000000
FS:  000055557ce9e400(0000) GS:ffff888124dd6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000072708000 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+0xae0/0x2010 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+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1351d03669
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd20598c38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1351d03669
RDX: 00002000000005c0 RSI: 0000000000004c0a RDI: 0000000000000004
RBP: 0000000000000001 R08: 000055557ce9f580 R09: 000055557ce9f580
R10: 0000200000000600 R11: 0000000000000246 R12: 00007ffd20598c60
R13: 0000000000000002 R14: 431bde82d7b634db R15: 00007f1351d6204b
 </TASK>

Crashes (38):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/30 05:07 linux-next e30626823a40 2f52988a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/22 14:16 linux-next 903c1cf6dff9 1e72964b .config strace 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 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
2026/08/30 06:22 upstream 08dbfad3f504 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in blk_validate_limits
2026/09/01 10:27 linux-next 89c07d98716a 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/09/01 10:26 linux-next 89c07d98716a 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/30 04:14 linux-next e30626823a40 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/22 12:57 linux-next 903c1cf6dff9 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in blk_validate_limits
2026/08/09 20:12 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
2026/08/09 20:11 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
2026/08/09 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
2026/09/09 09:07 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 5445d6419962 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in blk_validate_limits
2026/09/08 21:44 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 5445d6419962 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in blk_validate_limits
2026/09/08 08:48 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 5445d6419962 680aa3e1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in blk_validate_limits
2026/09/06 23:03 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 5445d6419962 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in blk_validate_limits
2026/09/06 20:54 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 5445d6419962 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in blk_validate_limits
2026/09/04 20:18 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 5445d6419962 3f042c7b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in blk_validate_limits
* Struck through repros no longer work on HEAD.