syzbot


WARNING in move_pgt_entry

Status: premoderation: reported C repro on 2026/05/19 03:11
Reported-by: syzbot+c30784708b8e26c55101@syzkaller.appspotmail.com
First crash: 6d10h, last: 6d09h

Sample crash report:
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fa495a16128 R14: 00007fa495a16090 R15: 00007ffc07f37d68
 </TASK>
------------[ cut here ]------------
WARNING: CPU: 1 PID: 447 at mm/mremap.c:291 move_normal_pmd mm/mremap.c:291 [inline]
WARNING: CPU: 1 PID: 447 at mm/mremap.c:291 move_pgt_entry+0x7f5/0x960 mm/mremap.c:510
Modules linked in:
CPU: 1 UID: 0 PID: 447 Comm: syz.2.38 Not tainted syzkaller #0 d58365df94cd5f4886b4f3ec3f08a458f2157066
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:move_normal_pmd mm/mremap.c:291 [inline]
RIP: 0010:move_pgt_entry+0x7f5/0x960 mm/mremap.c:510
Code: 00 00 40 b9 0c 00 00 00 41 b8 01 00 00 00 e8 52 c8 71 ff 48 8b 7d c0 e8 d9 ca d5 03 41 b7 01 4c 8b 6d b8 eb 5e e8 2b 59 b3 ff <0f> 0b 45 31 ff eb 52 e8 1f 59 b3 ff 0f 0b e9 60 fa ff ff e8 13 59
RSP: 0018:ffffc90000dff790 EFLAGS: 00010293
RAX: ffffffff81d46a75 RBX: 00000001287cf007 RCX: ffff888117251300
RDX: 0000000000000000 RSI: 00000001287cf007 RDI: 0000000000000000
RBP: ffffc90000dff808 R08: ffff888117251300 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8881158e2dc0 R14: dffffc0000000000 R15: 1ffff11022c72e00
FS:  00007fa4965e46c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000491000 CR3: 0000000115e1a000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 move_page_tables+0xd4c/0x1860 mm/mremap.c:672
 move_vma+0x592/0x11c0 mm/mremap.c:776
 mremap_to+0x546/0x610 mm/mremap.c:999
 __do_sys_mremap mm/mremap.c:1116 [inline]
 __se_sys_mremap+0x5af/0xfe0 mm/mremap.c:1027
 __x64_sys_mremap+0xc3/0xf0 mm/mremap.c:1027
 x64_sys_call+0x2ac4/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:26
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fa49579ce59
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:00007fa4965e4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000019
RAX: ffffffffffffffda RBX: 00007fa495a16090 RCX: 00007fa49579ce59
RDX: 0000000000400000 RSI: 0000000000c00000 RDI: 0000200000000000
RBP: 00007fa4965e4090 R08: 0000200000c00000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fa495a16128 R14: 00007fa495a16090 R15: 00007ffc07f37d68
 </TASK>
---[ end trace 0000000000000000 ]---

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/19 03:28 android16-6.12 be343ff665e2 9f74d399 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in move_pgt_entry
2026/05/19 03:10 android16-6.12 be343ff665e2 9f74d399 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in move_pgt_entry
* Struck through repros no longer work on HEAD.