On Wed, 10 Apr 2024 19:04:21 -0700 syzbot <syzbot+ddf4b4c0005944105a9e@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > syzbot has found a reproducer for the following issue on: Thanks. > HEAD commit: 480e035fc4c7 Merge tag 'drm-next-2024-03-13' of https://gi.. > git tree: upstream > console+strace: https://syzkaller.appspot.com/x/log.txt?x=14db82bd180000 > kernel config: https://syzkaller.appspot.com/x/.config?x=1e5b814e91787669 > dashboard link: https://syzkaller.appspot.com/bug?extid=ddf4b4c0005944105a9e > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13111a4d180000 Seems to be userfaultfd related. > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=156ae155180000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/5f73b6ef963d/disk-480e035f.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/46c949396aad/vmlinux-480e035f.xz > kernel image: https://storage.googleapis.com/syzbot-assets/e3b4d0f5a5f8/bzImage-480e035f.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+ddf4b4c0005944105a9e@xxxxxxxxxxxxxxxxxxxxxxxxx > > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 5134 at arch/x86/include/asm/pgtable.h:404 pte_uffd_wp arch/x86/include/asm/pgtable.h:404 [inline] > WARNING: CPU: 0 PID: 5134 at arch/x86/include/asm/pgtable.h:404 try_to_migrate_one+0x18e9/0x3ae0 mm/rmap.c:2256 > Modules linked in: > CPU: 0 PID: 5134 Comm: syz-executor306 Not tainted 6.8.0-syzkaller-08073-g480e035fc4c7 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 > RIP: 0010:pte_uffd_wp arch/x86/include/asm/pgtable.h:404 [inline] > RIP: 0010:try_to_migrate_one+0x18e9/0x3ae0 mm/rmap.c:2256 > Code: ac ff 41 83 e7 42 bf 40 00 00 00 4c 89 fe e8 9e 74 ac ff 49 83 ff 40 0f 84 91 08 00 00 e8 af 6f ac ff eb 09 e8 a8 6f ac ff 90 <0f> 0b 90 49 83 cd 04 48 8b 3c 24 e8 b7 89 ff ff 89 c3 48 b8 00 00 > RSP: 0018:ffffc9000458f1e0 EFLAGS: 00010293 > RAX: ffffffff81e885a8 RBX: d000000000000000 RCX: ffff8880177a3c00 > RDX: 0000000000000000 RSI: 0000000000000400 RDI: 0000000000000000 > RBP: ffffc9000458f550 R08: ffffffff81e88560 R09: 1ffffd40003c10d8 > R10: dffffc0000000000 R11: fffff940003c10d9 R12: 0000000000000001 > R13: d7ffe7fff0fbc802 R14: 0000000000000002 R15: 000000007821bc67 > FS: 00007f2b2a0666c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f2b2a06b9f0 CR3: 0000000023ffe000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > rmap_walk_anon+0x36f/0x680 mm/rmap.c:2599 > try_to_migrate+0x3de/0x4b0 > migrate_folio_unmap mm/migrate.c:1244 [inline] > migrate_pages_batch+0x10b4/0x3570 mm/migrate.c:1675 > migrate_pages_sync mm/migrate.c:1841 [inline] > migrate_pages+0x1eaf/0x3320 mm/migrate.c:1950 > do_mbind mm/mempolicy.c:1344 [inline] > kernel_mbind mm/mempolicy.c:1486 [inline] > __do_sys_mbind mm/mempolicy.c:1560 [inline] > __se_sys_mbind+0x11f5/0x1a70 mm/mempolicy.c:1556 > do_syscall_64+0xfb/0x240 > entry_SYSCALL_64_after_hwframe+0x6d/0x75 > RIP: 0033:0x7f2b2a0af089 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 1a 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007f2b2a066228 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed > RAX: ffffffffffffffda RBX: 00007f2b2a138408 RCX: 00007f2b2a0af089 > RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffd000 > RBP: 00007f2b2a138400 R08: 0000000000000000 R09: 0000000000000002 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2b2a1054f4 > R13: 0000000000000011 R14: 00007ffca01beb70 R15: 00007ffca01bec58 > </TASK> > > > --- > 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.
