syzbot has found a reproducer for the following issue on: HEAD commit: d2f51b3516da Merge tag 'rtc-6.7' of git://git.kernel.org/p.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1422ebef680000 kernel config: https://syzkaller.appspot.com/x/.config?x=1ffa1cec3b40f3ce dashboard link: https://syzkaller.appspot.com/bug?extid=398e17b61dab22cc56bc 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=16344918e80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=156bb2c0e80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/01a7f380fc8d/disk-d2f51b35.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c2fe46c74542/vmlinux-d2f51b35.xz kernel image: https://storage.googleapis.com/syzbot-assets/247d6a0567c5/bzImage-d2f51b35.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+398e17b61dab22cc56bc@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ kernel BUG at mm/memory.c:2216! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 5067 Comm: syz-executor340 Not tainted 6.6.0-syzkaller-14651-gd2f51b3516da #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 RIP: 0010:vmf_insert_pfn_prot+0x247/0x430 mm/memory.c:2216 Code: 0f 0b e8 7c e6 bd ff 49 89 ef bf 20 00 00 00 41 83 e7 28 4c 89 fe e8 f8 e1 bd ff 49 83 ff 20 0f 85 aa fe ff ff e8 59 e6 bd ff <0f> 0b 48 bd ff ff ff ff ff ff 0f 00 e8 48 e6 bd ff 4c 89 f6 48 89 RSP: 0018:ffffc90003bbf758 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff88802847ec00 RCX: ffffffff81cab618 RDX: ffff888015bd1dc0 RSI: ffffffff81cab627 RDI: 0000000000000007 RBP: 000000000c040474 R08: 0000000000000007 R09: 0000000000000020 R10: 0000000000000020 R11: 0000000000000009 R12: 0000000020ffd000 R13: 1ffff92000777eec R14: 000000000001e529 R15: 0000000000000020 FS: 0000555555e2a480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020ffd000 CR3: 000000002aae7000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> drm_gem_shmem_fault+0x207/0x400 drivers/gpu/drm/drm_gem_shmem_helper.c:531 __do_fault+0x107/0x5f0 mm/memory.c:4265 do_read_fault mm/memory.c:4628 [inline] do_fault mm/memory.c:4762 [inline] do_pte_missing mm/memory.c:3730 [inline] handle_pte_fault mm/memory.c:5038 [inline] __handle_mm_fault+0x2682/0x3d60 mm/memory.c:5179 handle_mm_fault+0x478/0xa00 mm/memory.c:5344 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+0x5c/0xd0 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:ffffc90003bbfb50 EFLAGS: 00050206 RAX: 0000000000000001 RBX: 0000000020ffd000 RCX: 0000000000001000 RDX: 0000000000000000 RSI: 0000000020ffd000 RDI: ffff888018796000 RBP: 0000000000001000 R08: 0000000000000001 R09: ffffed10030f2dff R10: ffff888018796fff R11: 0000000000000000 R12: 0000000020ffe000 R13: ffff888018796000 R14: 0000000000000000 R15: 0000000020ffd000 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:127 [inline] _copy_from_user+0xc2/0xf0 lib/usercopy.c:23 copy_from_user include/linux/uaccess.h:183 [inline] snd_rawmidi_kernel_write1+0x360/0x860 sound/core/rawmidi.c:1618 snd_rawmidi_write+0x26e/0xc00 sound/core/rawmidi.c:1687 vfs_write+0x2a4/0xdf0 fs/read_write.c:582 ksys_write+0x1f0/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f31add88d69 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:00007ffdd9a49ee8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ffdd9a49f00 RCX: 00007f31add88d69 RDX: 00000000fffffd2c RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007ffdd9a49f08 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffdd9a49f08 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdd9a4a168 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:vmf_insert_pfn_prot+0x247/0x430 mm/memory.c:2216 Code: 0f 0b e8 7c e6 bd ff 49 89 ef bf 20 00 00 00 41 83 e7 28 4c 89 fe e8 f8 e1 bd ff 49 83 ff 20 0f 85 aa fe ff ff e8 59 e6 bd ff <0f> 0b 48 bd ff ff ff ff ff ff 0f 00 e8 48 e6 bd ff 4c 89 f6 48 89 RSP: 0018:ffffc90003bbf758 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff88802847ec00 RCX: ffffffff81cab618 RDX: ffff888015bd1dc0 RSI: ffffffff81cab627 RDI: 0000000000000007 RBP: 000000000c040474 R08: 0000000000000007 R09: 0000000000000020 R10: 0000000000000020 R11: 0000000000000009 R12: 0000000020ffd000 R13: 1ffff92000777eec R14: 000000000001e529 R15: 0000000000000020 FS: 0000555555e2a480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020acb000 CR3: 000000002aae7000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- 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 --- 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.
