[syzbot] [mm?] WARNING in __split_vma

[syzbot] [mm?] WARNING in __split_vma

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    818bebeb63dd drm/xe: Don't hand out the flat CCS storage a..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1645f979580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ccca94d2c01b9e78
dashboard link: https://syzkaller.appspot.com/bug?extid=5c417b73ac02e0e352c4
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=104a0d49580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13f35979580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-818bebeb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6e4100526b12/vmlinux-818bebeb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/723c4783ee96/bzImage-818bebeb.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5c417b73ac02e0e352c4@syzkaller.appspotmail.com

------------[ cut here ]------------
pgoff != vma->vm_start >> 12
WARNING: mm/vma.h:276 at assert_sane_pgoff mm/vma.h:276 [inline], CPU#2: syz.0.17/5920
WARNING: mm/vma.h:276 at vma_set_pgoff mm/vma.h:282 [inline], CPU#2: syz.0.17/5920
WARNING: mm/vma.h:276 at vma_add_pgoff mm/vma.h:289 [inline], CPU#2: syz.0.17/5920
WARNING: mm/vma.h:276 at __split_vma+0x1228/0x1800 mm/vma.c:578, CPU#2: syz.0.17/5920
Modules linked in:
CPU: 2 UID: 0 PID: 5920 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:assert_sane_pgoff mm/vma.h:276 [inline]
RIP: 0010:vma_set_pgoff mm/vma.h:282 [inline]
RIP: 0010:vma_add_pgoff mm/vma.h:289 [inline]
RIP: 0010:__split_vma+0x1228/0x1800 mm/vma.c:578
Code: 3c 02 00 0f 85 d3 05 00 00 4c 8b 2b 48 89 ef 49 c1 ed 0c 4c 89 ee e8 a7 3d 9e ff 4c 39 ed 0f 84 bf fd ff ff e8 b9 43 9e ff 90 <0f> 0b 90 e9 b1 fd ff ff e8 ab 43 9e ff 48 8b 54 24 38 48 b8 00 00
RSP: 0018:ffffc9000344f228 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88803e4b23c0 RCX: 0000000000000000
RDX: ffff888030d0a580 RSI: ffffffff826cbe17 RDI: ffff888030d0a580
RBP: 0000000200000003 R08: 0000000000000006 R09: 0000000200000003
R10: 0000000200000ffd R11: 0000000000000000 R12: ffff88803e4b2410
R13: 0000000200000ffd R14: ffffc9000344f5c8 R15: 0000000000000000
FS:  000055555d60b500(0000) GS:ffff8880d5da2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff66f270000 CR3: 000000001345e000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 vms_gather_munmap_vmas+0x1d2/0x1720 mm/vma.c:1472
 __mmap_setup mm/vma.c:2496 [inline]
 __mmap_region+0x4a7/0x30b0 mm/vma.c:2818
 mmap_region+0x5a8/0x6d0 mm/vma.c:2921
 do_mmap+0x12c7/0x1c30 mm/mmap.c:573
 vm_mmap_pgoff+0x28d/0x470 mm/util.c:581
 ksys_mmap_pgoff+0x3cb/0x610 mm/mmap.c:619
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff66f39e0d9
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:00007ffec1164ee8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007ff66f625fa0 RCX: 00007ff66f39e0d9
RDX: 0000000000000001 RSI: 0000000000003000 RDI: 0000200000ffd000
RBP: 00007ff66f435024 R08: 0000000000000004 R09: 0000010000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff66f625fac R14: 00007ff66f625fa0 R15: 00007ff66f625fa0
 </TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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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

Re: [syzbot] [mm?] WARNING in __split_vma

[Andrew Morton]

On Thu, 27 Aug 2026 01:33:42 -0700 syzbot <syzbot+5c417b73ac02e0e352c4@syzkaller.appspotmail.com> wrote:

> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    818bebeb63dd drm/xe: Don't hand out the flat CCS storage a..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1645f979580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=ccca94d2c01b9e78
> dashboard link: https://syzkaller.appspot.com/bug?extid=5c417b73ac02e0e352c4
> compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=104a0d49580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13f35979580000
> 
> Downloadable assets:
> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-818bebeb.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/6e4100526b12/vmlinux-818bebeb.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/723c4783ee96/bzImage-818bebeb.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+5c417b73ac02e0e352c4@syzkaller.appspotmail.com

Thanks.

Hopefully fixed by the pending "mm/mremap: reset unfaulted VMA page
offset for MREMAP_DONTUNMAP".

https://lore.kernel.org/20260825-fix-mremap-dontunmap-pgoff-v1-1-39a40b2c98b3@kernel.org

Re: [syzbot] [mm?] WARNING in __split_vma

[Lorenzo Stoakes (ARM)]

#syz dup: [syzbot] [mm?] WARNING in vma_set_pgoff

On Thu, Aug 27, 2026 at 01:33:42AM -0700, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    818bebeb63dd drm/xe: Don't hand out the flat CCS storage a..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1645f979580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=ccca94d2c01b9e78
> dashboard link: https://syzkaller.appspot.com/bug?extid=5c417b73ac02e0e352c4
> compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=104a0d49580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13f35979580000
>
> Downloadable assets:
> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-818bebeb.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/6e4100526b12/vmlinux-818bebeb.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/723c4783ee96/bzImage-818bebeb.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+5c417b73ac02e0e352c4@syzkaller.appspotmail.com
>
> ------------[ cut here ]------------
> pgoff != vma->vm_start >> 12
> WARNING: mm/vma.h:276 at assert_sane_pgoff mm/vma.h:276 [inline], CPU#2: syz.0.17/5920
> WARNING: mm/vma.h:276 at vma_set_pgoff mm/vma.h:282 [inline], CPU#2: syz.0.17/5920
> WARNING: mm/vma.h:276 at vma_add_pgoff mm/vma.h:289 [inline], CPU#2: syz.0.17/5920
> WARNING: mm/vma.h:276 at __split_vma+0x1228/0x1800 mm/vma.c:578, CPU#2: syz.0.17/5920
> Modules linked in:
> CPU: 2 UID: 0 PID: 5920 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
> RIP: 0010:assert_sane_pgoff mm/vma.h:276 [inline]
> RIP: 0010:vma_set_pgoff mm/vma.h:282 [inline]
> RIP: 0010:vma_add_pgoff mm/vma.h:289 [inline]
> RIP: 0010:__split_vma+0x1228/0x1800 mm/vma.c:578
> Code: 3c 02 00 0f 85 d3 05 00 00 4c 8b 2b 48 89 ef 49 c1 ed 0c 4c 89 ee e8 a7 3d 9e ff 4c 39 ed 0f 84 bf fd ff ff e8 b9 43 9e ff 90 <0f> 0b 90 e9 b1 fd ff ff e8 ab 43 9e ff 48 8b 54 24 38 48 b8 00 00
> RSP: 0018:ffffc9000344f228 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: ffff88803e4b23c0 RCX: 0000000000000000
> RDX: ffff888030d0a580 RSI: ffffffff826cbe17 RDI: ffff888030d0a580
> RBP: 0000000200000003 R08: 0000000000000006 R09: 0000000200000003
> R10: 0000000200000ffd R11: 0000000000000000 R12: ffff88803e4b2410
> R13: 0000000200000ffd R14: ffffc9000344f5c8 R15: 0000000000000000
> FS:  000055555d60b500(0000) GS:ffff8880d5da2000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007ff66f270000 CR3: 000000001345e000 CR4: 0000000000352ef0
> Call Trace:
>  <TASK>
>  vms_gather_munmap_vmas+0x1d2/0x1720 mm/vma.c:1472
>  __mmap_setup mm/vma.c:2496 [inline]
>  __mmap_region+0x4a7/0x30b0 mm/vma.c:2818
>  mmap_region+0x5a8/0x6d0 mm/vma.c:2921
>  do_mmap+0x12c7/0x1c30 mm/mmap.c:573
>  vm_mmap_pgoff+0x28d/0x470 mm/util.c:581
>  ksys_mmap_pgoff+0x3cb/0x610 mm/mmap.c:619
>  __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
>  __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
>  __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
>  do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
>  do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7ff66f39e0d9
> 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:00007ffec1164ee8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
> RAX: ffffffffffffffda RBX: 00007ff66f625fa0 RCX: 00007ff66f39e0d9
> RDX: 0000000000000001 RSI: 0000000000003000 RDI: 0000200000ffd000
> RBP: 00007ff66f435024 R08: 0000000000000004 R09: 0000010000000000
> R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007ff66f625fac R14: 00007ff66f625fa0 R15: 00007ff66f625fa0
>  </TASK>
>
>
> ---
> 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

--
Cheers, Lorenzo

Re: [syzbot] [mm?] WARNING in __split_vma

[Lorenzo Stoakes (ARM)]

On Thu, Aug 27, 2026 at 09:33:22AM -0700, Andrew Morton wrote:
> On Thu, 27 Aug 2026 01:33:42 -0700 syzbot <syzbot+5c417b73ac02e0e352c4@syzkaller.appspotmail.com> wrote:
>
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit:    818bebeb63dd drm/xe: Don't hand out the flat CCS storage a..
> > git tree:       upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=1645f979580000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=ccca94d2c01b9e78
> > dashboard link: https://syzkaller.appspot.com/bug?extid=5c417b73ac02e0e352c4
> > compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=104a0d49580000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13f35979580000
> >
> > Downloadable assets:
> > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-818bebeb.raw.xz
> > vmlinux: https://storage.googleapis.com/syzbot-assets/6e4100526b12/vmlinux-818bebeb.xz
> > kernel image: https://storage.googleapis.com/syzbot-assets/723c4783ee96/bzImage-818bebeb.xz
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+5c417b73ac02e0e352c4@syzkaller.appspotmail.com
>
> Thanks.
>
> Hopefully fixed by the pending "mm/mremap: reset unfaulted VMA page
> offset for MREMAP_DONTUNMAP".
>
> https://lore.kernel.org/20260825-fix-mremap-dontunmap-pgoff-v1-1-39a40b2c98b3@kernel.org

Sorry, yeah, this looks to be the exact same thing, marked as dupe!

--
Cheers, Lorenzo