On Fri, Feb 03, 2023 at 08:25:32AM -0800, Christoph Hellwig wrote: > Where are the ntfs3 and btrfs tags coming from? This seems to clearly > be about ext4 in the call stack. I believe if you look at the reproducer, ext4 is the target of the DIO, but the source is a mmaped file on a corrupted ntfs3 image. Or maybe btrfs; it's created two images. > On Thu, Feb 02, 2023 at 11:54:48PM -0800, syzbot wrote: > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: ab072681eabe Merge tag 'irq_urgent_for_v6.2_rc6' of git://.. > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=15933749480000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=23330449ad10b66f > > dashboard link: https://syzkaller.appspot.com/bug?extid=401145a9a237779feb26 > > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13b3ba9e480000 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/a43bbc272cf3/disk-ab072681.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/fec05f5bcfa7/vmlinux-ab072681.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/00b9b0dd9801/bzImage-ab072681.xz > > mounted in repro #1: https://storage.googleapis.com/syzbot-assets/f7ef8856a9ce/mount_0.gz > > mounted in repro #2: https://storage.googleapis.com/syzbot-assets/79f8035a08dd/mount_4.gz > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+401145a9a237779feb26@xxxxxxxxxxxxxxxxxxxxxxxxx > > > > BUG: unable to handle page fault for address: 0000000020081000 > > #PF: supervisor write access in kernel mode > > #PF: error_code(0x0002) - not-present page > > PGD 1c9cc067 P4D 1c9cc067 PUD 280e9067 PMD 2a76b067 PTE 0 > > Oops: 0002 [#1] PREEMPT SMP KASAN > > CPU: 0 PID: 5441 Comm: syz-executor.1 Not tainted 6.2.0-rc5-syzkaller-00221-gab072681eabe #0 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 > > RIP: 0010:clear_user_rep_good+0x1c/0x30 arch/x86/lib/clear_page_64.S:147 > > Code: 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 48 83 f9 40 72 a6 89 ca 48 c1 e9 03 74 03 f3 48 ab 83 e2 07 74 04 89 d1 <f3> aa 31 c0 c3 48 c1 e1 03 83 e2 07 48 01 d1 eb f1 0f 1f 00 f3 0f > > RSP: 0018:ffffc900056f76d8 EFLAGS: 00050202 > > RAX: 0000000000000000 RBX: 0000000000081002 RCX: 0000000000000002 > > RDX: 0000000000000002 RSI: ffffffff84098c49 RDI: 0000000020081000 > > RBP: 0000000000081002 R08: 0000000000000000 R09: 0000000000000000 > > R10: 0000000000000001 R11: 0000000000094001 R12: ffffc900056f7d70 > > R13: 0000000020000000 R14: 000000007ffff000 R15: 0000000000000000 > > FS: 00007fc1837f1700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 0000000020081000 CR3: 000000002b26e000 CR4: 0000000000350ef0 > > Call Trace: > > <TASK> > > __clear_user arch/x86/include/asm/uaccess_64.h:103 [inline] > > clear_user arch/x86/include/asm/uaccess_64.h:124 [inline] > > iov_iter_zero+0x709/0x1290 lib/iov_iter.c:800 > > iomap_dio_hole_iter fs/iomap/direct-io.c:389 [inline] > > iomap_dio_iter fs/iomap/direct-io.c:440 [inline] > > __iomap_dio_rw+0xe3d/0x1cd0 fs/iomap/direct-io.c:601 > > iomap_dio_rw+0x40/0xa0 fs/iomap/direct-io.c:689 > > ext4_dio_read_iter fs/ext4/file.c:94 [inline] > > ext4_file_read_iter+0x4be/0x690 fs/ext4/file.c:145 > > call_read_iter include/linux/fs.h:2183 [inline] > > do_iter_readv_writev+0x2e0/0x3b0 fs/read_write.c:733 > > do_iter_read+0x2f2/0x750 fs/read_write.c:796 > > vfs_readv+0xe5/0x150 fs/read_write.c:916 > > do_preadv+0x1b6/0x270 fs/read_write.c:1008 > > __do_sys_preadv2 fs/read_write.c:1070 [inline] > > __se_sys_preadv2 fs/read_write.c:1061 [inline] > > __x64_sys_preadv2+0xef/0x150 fs/read_write.c:1061 > > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > > do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 > > entry_SYSCALL_64_after_hwframe+0x63/0xcd > > RIP: 0033:0x7fc182a8c0c9 > > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 > > RSP: 002b:00007fc1837f1168 EFLAGS: 00000246 ORIG_RAX: 0000000000000147 > > RAX: ffffffffffffffda RBX: 00007fc182babf80 RCX: 00007fc182a8c0c9 > > RDX: 0000000000000001 RSI: 0000000020000100 RDI: 0000000000000003 > > RBP: 00007fc182ae7ae9 R08: 0000000000000000 R09: 0000000000000000 > > R10: 000000000007fffe R11: 0000000000000246 R12: 0000000000000000 > > R13: 00007ffefd64d1ef R14: 00007fc1837f1300 R15: 0000000000022000 > > </TASK> > > Modules linked in: > > CR2: 0000000020081000 > > ---[ end trace 0000000000000000 ]--- > > RIP: 0010:clear_user_rep_good+0x1c/0x30 arch/x86/lib/clear_page_64.S:147 > > Code: 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 48 83 f9 40 72 a6 89 ca 48 c1 e9 03 74 03 f3 48 ab 83 e2 07 74 04 89 d1 <f3> aa 31 c0 c3 48 c1 e1 03 83 e2 07 48 01 d1 eb f1 0f 1f 00 f3 0f > > RSP: 0018:ffffc900056f76d8 EFLAGS: 00050202 > > RAX: 0000000000000000 RBX: 0000000000081002 RCX: 0000000000000002 > > RDX: 0000000000000002 RSI: ffffffff84098c49 RDI: 0000000020081000 > > RBP: 0000000000081002 R08: 0000000000000000 R09: 0000000000000000 > > R10: 0000000000000001 R11: 0000000000094001 R12: ffffc900056f7d70 > > R13: 0000000020000000 R14: 000000007ffff000 R15: 0000000000000000 > > FS: 00007fc1837f1700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 00007f8294a2a000 CR3: 000000002b26e000 CR4: 0000000000350ef0 > > ---------------- > > Code disassembly (best guess): > > 0: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) > > 7: 00 00 00 00 > > b: 0f 1f 00 nopl (%rax) > > e: f3 0f 1e fa endbr64 > > 12: 48 83 f9 40 cmp $0x40,%rcx > > 16: 72 a6 jb 0xffffffbe > > 18: 89 ca mov %ecx,%edx > > 1a: 48 c1 e9 03 shr $0x3,%rcx > > 1e: 74 03 je 0x23 > > 20: f3 48 ab rep stos %rax,%es:(%rdi) > > 23: 83 e2 07 and $0x7,%edx > > 26: 74 04 je 0x2c > > 28: 89 d1 mov %edx,%ecx > > * 2a: f3 aa rep stos %al,%es:(%rdi) <-- trapping instruction > > 2c: 31 c0 xor %eax,%eax > > 2e: c3 retq > > 2f: 48 c1 e1 03 shl $0x3,%rcx > > 33: 83 e2 07 and $0x7,%edx > > 36: 48 01 d1 add %rdx,%rcx > > 39: eb f1 jmp 0x2c > > 3b: 0f 1f 00 nopl (%rax) > > 3e: f3 repz > > 3f: 0f .byte 0xf > > > > > > --- > > 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. > > syzbot can test patches for this issue, for details see: > > https://goo.gl/tpsmEJ#testing-patches > ---end quoted text---
