syzbot


kernel BUG in move_pages

Status: fixed on 2024/01/30 15:47
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+705209281e36404998f6@syzkaller.appspotmail.com
Fix commit: 5d4747a6cc8e userfaultfd: avoid huge_zero_page in UFFDIO_MOVE
First crash: 137d, last: 137d
Cause bisection: introduced by (bisect log) :
commit adef440691bab824e39c1b17382322d195e1fab0
Author: Andrea Arcangeli <aarcange@redhat.com>
Date: Wed Dec 6 10:36:56 2023 +0000

  userfaultfd: UFFDIO_MOVE uABI

Crash: kernel BUG in move_pages (log)
Repro: C syz .config
  
Discussions (2)
Title Replies (including bot) Last reply
[PATCH 1/1] userfaultfd: avoid huge_zero_page in UFFDIO_MOVE 3 (3) 2024/01/12 17:31
[syzbot] [mm?] kernel BUG in move_pages 12 (13) 2024/01/12 02:57

Sample crash report:
 do_one_initcall+0x128/0x680 init/main.c:1237
 do_initcall_level init/main.c:1299 [inline]
 do_initcalls init/main.c:1315 [inline]
 do_basic_setup init/main.c:1334 [inline]
 kernel_init_freeable+0x692/0xc30 init/main.c:1552
 kernel_init+0x1c/0x2a0 init/main.c:1442
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
------------[ cut here ]------------
kernel BUG at include/linux/page-flags.h:1035!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5068 Comm: syz-executor191 Not tainted 6.7.0-rc8-next-20240105-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:PageAnonExclusive include/linux/page-flags.h:1035 [inline]
RIP: 0010:move_pages+0x1697/0x3d40 mm/userfaultfd.c:1402
Code: 00 00 48 c1 e8 0c 48 21 d0 48 c1 e0 06 48 01 c3 e9 b6 f7 ff ff e8 79 c6 9c ff 48 c7 c6 e0 7e dc 8a 48 89 df e8 0a 20 dc ff 90 <0f> 0b e8 62 c6 9c ff 48 89 da b8 ff ff 37 00 48 c1 ea 03 48 c1 e0
RSP: 0018:ffffc90003aefa98 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffea0001e40000 RCX: ffffffff81687599
RDX: ffff88802a155940 RSI: ffffffff81eb5d46 RDI: 0000000000000000
RBP: ffff88802abab810 R08: 0000000000000000 R09: fffffbfff1e75fda
R10: ffffffff8f3afed7 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000020518000 R15: 0000000000000000
FS:  00005555562cf380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000204f8000 CR3: 000000006a725000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 userfaultfd_move fs/userfaultfd.c:2047 [inline]
 userfaultfd_ioctl+0x683/0x6420 fs/userfaultfd.c:2169
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl fs/ioctl.c:857 [inline]
 __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd0/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7f4bada9b3e9
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff2c1d6998 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fff2c1d6b68 RCX: 00007f4bada9b3e9
RDX: 00000000200000c0 RSI: 00000000c028aa05 RDI: 0000000000000003
RBP: 00007f4badb0e610 R08: 00007fff2c1d6b68 R09: 00007fff2c1d6b68
R10: 00007fff2c1d6b68 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff2c1d6b58 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:PageAnonExclusive include/linux/page-flags.h:1035 [inline]
RIP: 0010:move_pages+0x1697/0x3d40 mm/userfaultfd.c:1402
Code: 00 00 48 c1 e8 0c 48 21 d0 48 c1 e0 06 48 01 c3 e9 b6 f7 ff ff e8 79 c6 9c ff 48 c7 c6 e0 7e dc 8a 48 89 df e8 0a 20 dc ff 90 <0f> 0b e8 62 c6 9c ff 48 89 da b8 ff ff 37 00 48 c1 ea 03 48 c1 e0
RSP: 0018:ffffc90003aefa98 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffea0001e40000 RCX: ffffffff81687599
RDX: ffff88802a155940 RSI: ffffffff81eb5d46 RDI: 0000000000000000
RBP: ffff88802abab810 R08: 0000000000000000 R09: fffffbfff1e75fda
R10: ffffffff8f3afed7 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000020518000 R15: 0000000000000000
FS:  00005555562cf380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000204f8000 CR3: 000000006a725000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/01/07 16:38 linux-next e2425464bc87 d0304e9c .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in move_pages
2024/01/07 16:17 linux-next e2425464bc87 d0304e9c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in move_pages
* Struck through repros no longer work on HEAD.