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WARNING in hugetlb_split

Status: upstream: reported C repro on 2025/06/27 11:04
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+c7a84558d87a6d4b5e4a@syzkaller.appspotmail.com
First crash: 383d, last: 16m
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/07/13 linux-5.15.y (ToT) 2f693b607545 C [report] WARNING in hugetlb_split
2025/07/13 upstream (ToT) 3f31a806a62e C Didn't crash
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in hugetlb_split origin:lts-only -1 C error 109150 now 383d 0/3 upstream: reported C repro on 2025/06/27 11:34
▶ ▼ Fix bisection attempts (4)
Created Duration User Patch Repo Result
2026/05/23 10:41 13m fix candidate upstream error job log
2026/03/24 15:50 1m fix candidate upstream error job log
2026/02/21 08:22 1m fix candidate upstream error job log
2026/01/21 20:52 1m fix candidate upstream error job log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4315 at include/linux/fs.h:532 i_mmap_assert_write_locked include/linux/fs.h:532 [inline]
WARNING: CPU: 0 PID: 4315 at include/linux/fs.h:532 hugetlb_split+0x237/0x2a0 mm/hugetlb.c:4182
Modules linked in:
CPU: 0 PID: 4315 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:i_mmap_assert_write_locked include/linux/fs.h:532 [inline]
RIP: 0010:hugetlb_split+0x237/0x2a0 mm/hugetlb.c:4182
Code: bf ff 4c 89 f7 48 89 de 4c 89 fa 31 c9 5b 41 5c 41 5d 41 5e 41 5f 5d eb 7a e8 65 ad bf ff 0f 0b e9 62 fe ff ff e8 59 ad bf ff <0f> 0b e9 2d ff ff ff 48 c7 c1 84 3a 8a 8d 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000312f8e0 EFLAGS: 00010293
RAX: ffffffff81b99b97 RBX: 0000200000400000 RCX: ffff888020e20000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88802c7338bf R09: 1ffff110058e6717
R10: dffffc0000000000 R11: ffffed10058e6718 R12: ffff88807a8e2f10
R13: dffffc0000000000 R14: ffff88807a8e2e70 R15: ffff88802c31c1c0
FS:  0000555582c38500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 0000000024660000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __vma_adjust+0x2b6/0x1c10 mm/mmap.c:843
 vma_adjust include/linux/mm.h:2567 [inline]
 __split_vma+0x34b/0x410 mm/mmap.c:-1
 userfaultfd_register fs/userfaultfd.c:1443 [inline]
 userfaultfd_ioctl+0x2fa4/0x4170 fs/userfaultfd.c:1990
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f2cb66a3e59
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:00007ffef9e694e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2cb691cfa0 RCX: 00007f2cb66a3e59
RDX: 0000200000000040 RSI: 00000000c020aa00 RDI: 0000000000000003
RBP: 00007f2cb6739d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2cb691cfac R14: 00007f2cb691cfa0 R15: 00007f2cb691cfa0
 </TASK>

Crashes (63285):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/13 17:01 linux-5.15.y dc027a595035 1d2f3589 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/05/07 23:15 linux-5.15.y ef251c45f1cd cbf9e0fc .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/05/04 00:35 linux-5.15.y ef251c45f1cd a0d91488 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/05/03 23:49 linux-5.15.y ef251c45f1cd a0d91488 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/05/03 23:09 linux-5.15.y ef251c45f1cd a0d91488 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/04/11 14:12 linux-5.15.y 91d48252ad4b 38c8e246 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/02/14 02:54 linux-5.15.y e45d5d41c134 1e62d198 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2025/11/05 22:12 linux-5.15.y cc5ec8769306 a6c9c731 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2025/08/15 18:27 linux-5.15.y c79648372d02 1804e95e .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2025/08/05 06:18 linux-5.15.y c79648372d02 f5bcc8dc .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan WARNING in hugetlb_split
2025/07/08 00:58 linux-5.15.y 3dea0e7f549e 4f67c4ae .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2025/07/02 00:07 linux-5.15.y 3dea0e7f549e 091a06cd .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in hugetlb_split
2026/07/16 09:16 linux-5.15.y c86c4726e7f0 27a8bd60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/16 08:33 linux-5.15.y c86c4726e7f0 27a8bd60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/16 07:59 linux-5.15.y c86c4726e7f0 27a8bd60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/16 06:59 linux-5.15.y c86c4726e7f0 27a8bd60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/16 06:34 linux-5.15.y c86c4726e7f0 27a8bd60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/16 05:57 linux-5.15.y c86c4726e7f0 27a8bd60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/16 04:34 linux-5.15.y c86c4726e7f0 27a8bd60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 21:40 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 20:55 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 19:48 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 19:44 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 16:42 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 16:17 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 14:45 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 14:27 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 13:40 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 12:12 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 07:32 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 06:29 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 06:25 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 05:19 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 04:57 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 04:19 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 04:13 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/15 01:24 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 23:23 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 20:56 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 20:21 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 19:08 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 19:08 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 18:04 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 17:57 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 16:57 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 16:40 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 15:40 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 14:49 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 13:48 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 11:37 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 11:32 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 10:00 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 08:58 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2026/07/14 07:58 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2025/06/27 11:03 linux-5.15.y 3dea0e7f549e 803ce19b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in hugetlb_split
2025/08/28 17:18 linux-5.15.y c79648372d02 e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in hugetlb_split
* Struck through repros no longer work on HEAD.