* [syzbot] [iommu?] WARNING in iopt_map_pages (3)
@ 2025-12-08 7:41 syzbot
2025-12-09 11:57 ` Yi Liu
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2025-12-08 7:41 UTC (permalink / raw)
To: iommu, jgg, joro, kevin.tian, linux-kernel, robin.murphy,
syzkaller-bugs, will
Hello,
syzbot found the following issue on:
HEAD commit: 05c93f3395ed Merge branch 'for-next/core' into for-kernelci
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=14eb7c1a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=3b5338ad1e59a06c
dashboard link: https://syzkaller.appspot.com/bug?extid=57fdb0cf6a0c5d1f15a2
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17dfc992580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12a926c2580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6b5c913e373c/disk-05c93f33.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/15e75f1266ef/vmlinux-05c93f33.xz
kernel image: https://storage.googleapis.com/syzbot-assets/dd930129c578/Image-05c93f33.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+57fdb0cf6a0c5d1f15a2@syzkaller.appspotmail.com
iommufd_mock iommufd_mock0: Adding to iommu group 0
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6739 at drivers/iommu/iommufd/io_pagetable.c:292 iopt_alloc_area_pages drivers/iommu/iommufd/io_pagetable.c:292 [inline]
WARNING: CPU: 0 PID: 6739 at drivers/iommu/iommufd/io_pagetable.c:292 iopt_map_pages+0xd7c/0xdcc drivers/iommu/iommufd/io_pagetable.c:376
Modules linked in:
CPU: 0 UID: 0 PID: 6739 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : iopt_alloc_area_pages drivers/iommu/iommufd/io_pagetable.c:292 [inline]
pc : iopt_map_pages+0xd7c/0xdcc drivers/iommu/iommufd/io_pagetable.c:376
lr : iopt_alloc_area_pages drivers/iommu/iommufd/io_pagetable.c:292 [inline]
lr : iopt_map_pages+0xd7c/0xdcc drivers/iommu/iommufd/io_pagetable.c:376
sp : ffff8000a04f76c0
x29: ffff8000a04f78a0 x28: ffff0000d66f4810 x27: 1fffe0001acde944
x26: ffff8000a04f7b00 x25: 0000000000002fff x24: 0000000000003000
x23: ffff0000d66f4a20 x22: ffff0000d66f49f8 x21: 00000000ffffffea
x20: dfff800000000000 x19: ffff8000a04f79b0 x18: 0000000000000000
x17: ffff800083ce6110 x16: ffff80008052b3c8 x15: 0000000000000007
x14: 0000000000000000 x13: 00000000ffffffff x12: 0000000000ff0100
x11: ffff0000c72f5c40 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000c72f5c40 x7 : 0000000000000000 x6 : 000000000000003f
x5 : 0000000000000040 x4 : ffffffffffffefff x3 : ffffffffffffefff
x2 : 0000000000f03fff x1 : 00000000ffffffea x0 : 0000000000000000
Call trace:
iopt_alloc_area_pages drivers/iommu/iommufd/io_pagetable.c:292 [inline] (P)
iopt_map_pages+0xd7c/0xdcc drivers/iommu/iommufd/io_pagetable.c:376 (P)
iopt_map_common+0x204/0x420 drivers/iommu/iommufd/io_pagetable.c:420
iopt_map_user_pages+0xb4/0xd8 drivers/iommu/iommufd/io_pagetable.c:461
iommufd_ioas_map+0x2d4/0x3d0 drivers/iommu/iommufd/ioas.c:276
iommufd_fops_ioctl+0x424/0x54c drivers/iommu/iommufd/main.c:533
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:583
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
irq event stamp: 1160
hardirqs last enabled at (1159): [<ffff80008ae21fa0>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last enabled at (1159): [<ffff80008ae21fa0>] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194
hardirqs last disabled at (1160): [<ffff80008adf99f4>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:412
softirqs last enabled at (132): [<ffff8000801f96d0>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (130): [<ffff8000801f969c>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---
---
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:
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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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [iommu?] WARNING in iopt_map_pages (3)
2025-12-08 7:41 [syzbot] [iommu?] WARNING in iopt_map_pages (3) syzbot
@ 2025-12-09 11:57 ` Yi Liu
2025-12-12 6:56 ` Jason Gunthorpe
0 siblings, 1 reply; 3+ messages in thread
From: Yi Liu @ 2025-12-09 11:57 UTC (permalink / raw)
To: syzbot, iommu, jgg, joro, kevin.tian, linux-kernel, robin.murphy,
syzkaller-bugs, will
On 2025/12/8 15:41, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 05c93f3395ed Merge branch 'for-next/core' into for-kernelci
> git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
> console output: https://syzkaller.appspot.com/x/log.txt?x=14eb7c1a580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=3b5338ad1e59a06c
> dashboard link: https://syzkaller.appspot.com/bug?extid=57fdb0cf6a0c5d1f15a2
> compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> userspace arch: arm64
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17dfc992580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12a926c2580000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/6b5c913e373c/disk-05c93f33.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/15e75f1266ef/vmlinux-05c93f33.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/dd930129c578/Image-05c93f33.gz.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+57fdb0cf6a0c5d1f15a2@syzkaller.appspotmail.com
>
> iommufd_mock iommufd_mock0: Adding to iommu group 0
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 6739 at drivers/iommu/iommufd/io_pagetable.c:292 iopt_alloc_area_pages drivers/iommu/iommufd/io_pagetable.c:292 [inline]
> WARNING: CPU: 0 PID: 6739 at drivers/iommu/iommufd/io_pagetable.c:292 iopt_map_pages+0xd7c/0xdcc drivers/iommu/iommufd/io_pagetable.c:376
> Modules linked in:
> CPU: 0 UID: 0 PID: 6739 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
> pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
> pc : iopt_alloc_area_pages drivers/iommu/iommufd/io_pagetable.c:292 [inline]
> pc : iopt_map_pages+0xd7c/0xdcc drivers/iommu/iommufd/io_pagetable.c:376
> lr : iopt_alloc_area_pages drivers/iommu/iommufd/io_pagetable.c:292 [inline]
> lr : iopt_map_pages+0xd7c/0xdcc drivers/iommu/iommufd/io_pagetable.c:376
> sp : ffff8000a04f76c0
> x29: ffff8000a04f78a0 x28: ffff0000d66f4810 x27: 1fffe0001acde944
> x26: ffff8000a04f7b00 x25: 0000000000002fff x24: 0000000000003000
> x23: ffff0000d66f4a20 x22: ffff0000d66f49f8 x21: 00000000ffffffea
> x20: dfff800000000000 x19: ffff8000a04f79b0 x18: 0000000000000000
> x17: ffff800083ce6110 x16: ffff80008052b3c8 x15: 0000000000000007
> x14: 0000000000000000 x13: 00000000ffffffff x12: 0000000000ff0100
> x11: ffff0000c72f5c40 x10: 0000000000ff0100 x9 : 0000000000000000
> x8 : ffff0000c72f5c40 x7 : 0000000000000000 x6 : 000000000000003f
> x5 : 0000000000000040 x4 : ffffffffffffefff x3 : ffffffffffffefff
> x2 : 0000000000f03fff x1 : 00000000ffffffea x0 : 0000000000000000
> Call trace:
> iopt_alloc_area_pages drivers/iommu/iommufd/io_pagetable.c:292 [inline] (P)
> iopt_map_pages+0xd7c/0xdcc drivers/iommu/iommufd/io_pagetable.c:376 (P)
> iopt_map_common+0x204/0x420 drivers/iommu/iommufd/io_pagetable.c:420
> iopt_map_user_pages+0xb4/0xd8 drivers/iommu/iommufd/io_pagetable.c:461
> iommufd_ioas_map+0x2d4/0x3d0 drivers/iommu/iommufd/ioas.c:276
> iommufd_fops_ioctl+0x424/0x54c drivers/iommu/iommufd/main.c:533
> vfs_ioctl fs/ioctl.c:51 [inline]
> __do_sys_ioctl fs/ioctl.c:597 [inline]
> __se_sys_ioctl fs/ioctl.c:583 [inline]
> __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:583
> __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
> invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
> el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
> do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
> el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724
> el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
> el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
> irq event stamp: 1160
> hardirqs last enabled at (1159): [<ffff80008ae21fa0>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
> hardirqs last enabled at (1159): [<ffff80008ae21fa0>] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194
> hardirqs last disabled at (1160): [<ffff80008adf99f4>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:412
> softirqs last enabled at (132): [<ffff8000801f96d0>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
> softirqs last disabled at (130): [<ffff8000801f969c>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
> ---[ end trace 0000000000000000 ]---
It looks to be an overflow error as user gives the below arg. But
this should be expected. no?
// start: int64 = 0x1000005 (8 bytes)
// length: int64 = 0xffffffffffefffff (8 bytes)
>
> ---
> 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
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [iommu?] WARNING in iopt_map_pages (3)
2025-12-09 11:57 ` Yi Liu
@ 2025-12-12 6:56 ` Jason Gunthorpe
0 siblings, 0 replies; 3+ messages in thread
From: Jason Gunthorpe @ 2025-12-12 6:56 UTC (permalink / raw)
To: Yi Liu
Cc: syzbot, iommu, joro, kevin.tian, linux-kernel, robin.murphy,
syzkaller-bugs, will
On Tue, Dec 09, 2025 at 07:57:06PM +0800, Yi Liu wrote:
> It looks to be an overflow error as user gives the below arg. But
> this should be expected. no?
>
> // start: int64 = 0x1000005 (8 bytes)
> // length: int64 = 0xffffffffffefffff (8 bytes)
Something probably overflowed, the test is:
r0 = openat$iommufd(0xffffffffffffff9c, &(0x7f0000000000), 0x0, 0x0)
ioctl$IOMMU_IOAS_ALLOC(r0, 0x3b81, &(0x7f0000000100)={0xc, 0x0, <r1=>0x0})
ioctl$IOMMU_TEST_OP_ADD_RESERVED(r0, 0x3ba0, &(0x7f0000000040)={0x48, 0x1, r1, 0x0, 0x1000005, 0xffffffffffefffff})
ioctl$IOMMU_TEST_OP_MOCK_DOMAIN_FLAGS(r0, 0x3ba0, &(0x7f00000003c0)={0x48, 0x2, r1})
ioctl$IOMMU_IOAS_MAP$PAGES(r0, 0x3b85, &(0x7f0000001340)={0x28, 0x2, r1, 0x0, &(0x7f00003bd000/0x3000)=nil, 0x3000, 0x80})
And I'm guessing the allocator picked something that failed the
reserved range intersection path:
/* No reserved IOVA intersects the range */
if (iopt_reserved_iter_first(iopt, iova, last))
return -EINVAL;
Maybe due to a corrupted range or something.
I'll look next week
Jason
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2025-12-12 6:56 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2025-12-08 7:41 [syzbot] [iommu?] WARNING in iopt_map_pages (3) syzbot
2025-12-09 11:57 ` Yi Liu
2025-12-12 6:56 ` Jason Gunthorpe
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