Hello, syzbot found the following issue on: HEAD commit: a72b55bc981b Add linux-next specific files for 20221019 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=14510b06880000 kernel config: https://syzkaller.appspot.com/x/.config?x=200524babbc01b2a dashboard link: https://syzkaller.appspot.com/bug?extid=a3e6acd85ded5c16a709 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=15bbe2d2880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16678bd6880000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/fa24fb5893fd/disk-a72b55bc.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/cf1b7e7b579c/vmlinux-a72b55bc.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a3e6acd85ded5c16a709@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 3607 Comm: syz-executor454 Not tainted 6.1.0-rc1-next-20221019-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 RIP: 0010:hugetlbfs_parse_param+0x1dd/0x8e0 fs/hugetlbfs/inode.c:1380 Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 84 06 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 65 10 4c 89 e2 48 c1 ea 03 <0f> b6 04 02 4c 89 e2 83 e2 07 38 d0 7f 0c 84 c0 74 08 4c 89 e7 e8 RSP: 0018:ffffc90003a5fb48 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 1ffff9200074bf6b RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff82350899 RDI: ffffc90003a5fc78 RBP: ffff88801db5ac00 R08: 0000000000000005 R09: 0000000000000006 R10: 0000000000000005 R11: 000000000008c001 R12: 0000000000000000 R13: ffffc90003a5fc68 R14: ffff88801d5fbf00 R15: ffff88801db5acd0 FS: 00005555569383c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020001000 CR3: 0000000074e4c000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> vfs_parse_fs_param fs/fs_context.c:148 [inline] vfs_parse_fs_param+0x1f9/0x3c0 fs/fs_context.c:129 vfs_parse_fs_string+0xdb/0x170 fs/fs_context.c:191 generic_parse_monolithic+0x16f/0x1f0 fs/fs_context.c:231 do_new_mount fs/namespace.c:3036 [inline] path_mount+0x12de/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f06d8633fe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe278e8e18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffe278e8e28 RCX: 00007f06d8633fe9 RDX: 0000000020000040 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 00007ffe278e8e20 R08: 0000000020000280 R09: 00007f06d85f20a0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:hugetlbfs_parse_param+0x1dd/0x8e0 fs/hugetlbfs/inode.c:1380 Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 84 06 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 65 10 4c 89 e2 48 c1 ea 03 <0f> b6 04 02 4c 89 e2 83 e2 07 38 d0 7f 0c 84 c0 74 08 4c 89 e7 e8 RSP: 0018:ffffc90003a5fb48 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 1ffff9200074bf6b RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff82350899 RDI: ffffc90003a5fc78 RBP: ffff88801db5ac00 R08: 0000000000000005 R09: 0000000000000006 R10: 0000000000000005 R11: 000000000008c001 R12: 0000000000000000 R13: ffffc90003a5fc68 R14: ffff88801d5fbf00 R15: ffff88801db5acd0 FS: 00005555569383c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f06d86453c0 CR3: 0000000074e4c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: df 48 89 fisttps -0x77(%rax) 3: fa cli 4: 48 c1 ea 03 shr $0x3,%rdx 8: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) c: 0f 85 84 06 00 00 jne 0x696 12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 19: fc ff df 1c: 4d 8b 65 10 mov 0x10(%r13),%r12 20: 4c 89 e2 mov %r12,%rdx 23: 48 c1 ea 03 shr $0x3,%rdx * 27: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2b: 4c 89 e2 mov %r12,%rdx 2e: 83 e2 07 and $0x7,%edx 31: 38 d0 cmp %dl,%al 33: 7f 0c jg 0x41 35: 84 c0 test %al,%al 37: 74 08 je 0x41 39: 4c 89 e7 mov %r12,%rdi 3c: e8 .byte 0xe8 --- 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
