Hello, syzbot found the following issue on: HEAD commit: f2e8a57ee903 Merge tag 'scsi-fixes' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14fdc732e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=e56083f7dbe162c2 dashboard link: https://syzkaller.appspot.com/bug?extid=81227d2bd69e9dedb802 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=129d09cae80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10b8afeee80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7b75e59fc59d/disk-f2e8a57e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f853580d61be/vmlinux-f2e8a57e.xz kernel image: https://storage.googleapis.com/syzbot-assets/8c893ce02e2c/bzImage-f2e8a57e.xz Bisection is inconclusive: the first bad commit could be any of: d61ea1cb0095 userfaultfd: UFFD_FEATURE_WP_ASYNC 52526ca7fdb9 fs/proc/task_mmu: implement IOCTL to get and optionally clear info about PTEs bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=120b3bdae80000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+81227d2bd69e9dedb802@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5067 at arch/x86/kvm/../../../virt/kvm/kvm_main.c:734 kvm_mmu_notifier_change_pte+0x860/0x960 arch/x86/kvm/../../../virt/kvm/kvm_main.c:734 Modules linked in: CPU: 0 PID: 5067 Comm: syz-executor813 Not tainted 6.7.0-rc4-syzkaller-00358-gf2e8a57ee903 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 RIP: 0010:kvm_mmu_notifier_change_pte+0x860/0x960 arch/x86/kvm/../../../virt/kvm/kvm_main.c:734 Code: c7 80 16 c2 8a c6 05 61 3e f9 0d 01 e8 29 80 5d 00 e9 80 fa ff ff e8 8f 93 7d 00 90 0f 0b 90 e9 c0 fd ff ff e8 81 93 7d 00 90 <0f> 0b 90 e9 0f f9 ff ff e8 73 93 7d 00 90 0f 0b 90 e9 76 f8 ff ff RSP: 0018:ffffc900040e73a0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000020537000 RCX: ffffffff8109f33e RDX: ffff888016fd9dc0 RSI: ffffffff8109fa2f RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000003 R12: ffff88801afd5f00 R13: 0000000020537000 R14: 0000000076630867 R15: ffffffff8109f1d0 FS: 00007f62e85146c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020537000 CR3: 00000000288fa000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __mmu_notifier_change_pte+0x10d/0x1d0 mm/mmu_notifier.c:438 mmu_notifier_change_pte include/linux/mmu_notifier.h:446 [inline] wp_page_copy mm/memory.c:3197 [inline] do_wp_page+0x26a7/0x36b0 mm/memory.c:3511 handle_pte_fault mm/memory.c:5055 [inline] __handle_mm_fault+0x1d7d/0x3d70 mm/memory.c:5180 handle_mm_fault+0x47a/0xa10 mm/memory.c:5345 do_user_addr_fault+0x3d1/0x1000 arch/x86/mm/fault.c:1413 handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x5d/0xc0 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:71 Code: 75 f1 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 <f3> a4 c3 48 89 c8 48 c1 e9 03 83 e0 07 f3 48 a5 89 c1 85 c9 75 b3 RSP: 0018:ffffc900040e7968 EFLAGS: 00050206 RAX: 0000000000000001 RBX: 0000000000001000 RCX: 0000000000000e80 RDX: 0000000000000000 RSI: ffff888010b22180 RDI: 0000000020537000 RBP: 0000000000001000 R08: 0000000000000000 R09: ffffed10021645ff R10: ffff888010b22fff R11: 0000000000000000 R12: 0000000000536b80 R13: ffffc900040e7d60 R14: ffff888010b22000 R15: 0000000020536e80 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:133 [inline] copy_to_user_iter lib/iov_iter.c:25 [inline] iterate_iovec include/linux/iov_iter.h:51 [inline] iterate_and_advance2 include/linux/iov_iter.h:247 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] _copy_to_iter+0x4ce/0x11e0 lib/iov_iter.c:186 copy_page_to_iter lib/iov_iter.c:381 [inline] copy_page_to_iter+0xf1/0x180 lib/iov_iter.c:368 process_vm_rw_pages mm/process_vm_access.c:45 [inline] process_vm_rw_single_vec mm/process_vm_access.c:117 [inline] process_vm_rw_core.constprop.0+0x5cd/0xa10 mm/process_vm_access.c:215 process_vm_rw+0x2ff/0x360 mm/process_vm_access.c:283 __do_sys_process_vm_readv mm/process_vm_access.c:295 [inline] __se_sys_process_vm_readv mm/process_vm_access.c:291 [inline] __x64_sys_process_vm_readv+0xe2/0x1b0 mm/process_vm_access.c:291 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f62e855c889 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 1d 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:00007f62e85140c8 EFLAGS: 00000216 ORIG_RAX: 0000000000000136 RAX: ffffffffffffffda RBX: 00007f62e85df3e8 RCX: 00007f62e855c889 RDX: 0000000000000002 RSI: 0000000020008400 RDI: 00000000000013ca RBP: 00007f62e85df3e0 R08: 0000000000000286 R09: 0000000000000000 R10: 0000000020008640 R11: 0000000000000216 R12: 00007f62e85df3ec R13: 0000000000000000 R14: 00007ffd42ee6360 R15: 00007ffd42ee6448 </TASK> ---------------- Code disassembly (best guess): 0: 75 f1 jne 0xfffffff3 2: c3 ret 3: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) a: 00 00 00 00 e: 66 90 xchg %ax,%ax 10: 48 8b 06 mov (%rsi),%rax 13: 48 89 07 mov %rax,(%rdi) 16: 48 83 c6 08 add $0x8,%rsi 1a: 48 83 c7 08 add $0x8,%rdi 1e: 83 e9 08 sub $0x8,%ecx 21: 74 df je 0x2 23: 83 f9 08 cmp $0x8,%ecx 26: 73 e8 jae 0x10 28: eb c9 jmp 0xfffffff3 * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: c3 ret 2d: 48 89 c8 mov %rcx,%rax 30: 48 c1 e9 03 shr $0x3,%rcx 34: 83 e0 07 and $0x7,%eax 37: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi) 3a: 89 c1 mov %eax,%ecx 3c: 85 c9 test %ecx,%ecx 3e: 75 b3 jne 0xfffffff3 --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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
