Hello, syzbot found the following issue on: HEAD commit: f5837722ffec Merge tag 'mm-hotfixes-stable-2023-12-27-15-0.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17ad7616e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=da1c95d4e55dda83 dashboard link: https://syzkaller.appspot.com/bug?extid=63cebbb27f598a7f901b 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=1230c7e9e80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=133d189ae80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/bb9a47cfe092/disk-f5837722.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3e6428b5b55b/vmlinux-f5837722.xz kernel image: https://storage.googleapis.com/syzbot-assets/545d22abacbc/bzImage-f5837722.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/bb1e27bc000d/mount_0.gz The issue was bisected to: commit 13d257503c0930010ef9eed78b689cec417ab741 Author: Shreyansh Chouhan <chouhan.shreyansh630@xxxxxxxxx> Date: Fri Jul 9 15:29:29 2021 +0000 reiserfs: check directory items on read from disk bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=125e92f9e80000 final oops: https://syzkaller.appspot.com/x/report.txt?x=115e92f9e80000 console output: https://syzkaller.appspot.com/x/log.txt?x=165e92f9e80000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+63cebbb27f598a7f901b@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 13d257503c09 ("reiserfs: check directory items on read from disk") general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 PID: 5053 Comm: sshd Not tainted 6.7.0-rc7-syzkaller-00016-gf5837722ffec #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 RIP: 0010:__fget_files_rcu fs/file.c:963 [inline] RIP: 0010:__fget_files+0x96/0x340 fs/file.c:1022 Code: 89 f8 48 c1 e8 03 4c 01 f0 48 89 04 24 e8 62 86 92 ff 48 8b 04 24 80 38 00 0f 85 7f 02 00 00 4d 8b 65 58 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 30 84 c0 74 08 3c 03 0f 8e 70 02 00 00 41 8b 1c 24 89 RSP: 0018:ffffc9000331f8a0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81f3df8d RDX: ffff88802a5e2180 RSI: ffffffff81f3de1e RDI: 0000000000000001 RBP: 0000000000000004 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88807300f040 R14: dffffc0000000000 R15: ffff88807300f098 FS: 00007f9d8d382800(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005592de0c8df8 CR3: 000000001f753000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __fget fs/file.c:1030 [inline] __fget_light+0xd0/0x260 fs/file.c:1137 fdget include/linux/file.h:64 [inline] do_pollfd fs/select.c:866 [inline] do_poll fs/select.c:921 [inline] do_sys_poll+0x469/0xde0 fs/select.c:1015 __do_sys_ppoll fs/select.c:1121 [inline] __se_sys_ppoll fs/select.c:1101 [inline] __x64_sys_ppoll+0x256/0x2d0 fs/select.c:1101 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: 0033:0x7f9d8cf19ad5 Code: 85 d2 74 0d 0f 10 02 48 8d 54 24 20 0f 11 44 24 20 64 8b 04 25 18 00 00 00 85 c0 75 27 41 b8 08 00 00 00 b8 0f 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 75 48 8b 15 24 73 0d 00 f7 d8 64 89 02 48 83 RSP: 002b:00007ffeaa4272d0 EFLAGS: 00000246 ORIG_RAX: 000000000000010f RAX: ffffffffffffffda RBX: 00000000000668a0 RCX: 00007f9d8cf19ad5 RDX: 00007ffeaa4272f0 RSI: 0000000000000004 RDI: 000055c03123eaa0 RBP: 000055c03123f260 R08: 0000000000000008 R09: 0000000000000000 R10: 00007ffeaa4273d8 R11: 0000000000000246 R12: 000055c02f66caa4 R13: 0000000000000001 R14: 000055c02f66d3e8 R15: 00007ffeaa427358 </TASK> Modules linked in: ---------------- Code disassembly (best guess): 0: 89 f8 mov %edi,%eax 2: 48 c1 e8 03 shr $0x3,%rax 6: 4c 01 f0 add %r14,%rax 9: 48 89 04 24 mov %rax,(%rsp) d: e8 62 86 92 ff call 0xff928674 12: 48 8b 04 24 mov (%rsp),%rax 16: 80 38 00 cmpb $0x0,(%rax) 19: 0f 85 7f 02 00 00 jne 0x29e 1f: 4d 8b 65 58 mov 0x58(%r13),%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 74 08 je 0x3b 33: 3c 03 cmp $0x3,%al 35: 0f 8e 70 02 00 00 jle 0x2ab 3b: 41 8b 1c 24 mov (%r12),%ebx 3f: 89 .byte 0x89 --- 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
