[syzbot] [overlayfs?] general protection fault in do_dentry_open
syzbot <[email protected]>
| Newsgroups | org.kernel.vger.linux-unionfs,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
Hello, syzbot found the following issue on: HEAD commit: 8e5a478b6d6a Add linux-next specific files for 20260317 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1391d602580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1d7d59e3bf573a4f dashboard link: https://syzkaller.appspot.com/bug?extid=f34aab278bf5d664e2be compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15395b4a580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=130ef8da580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d3f80068a490/disk-8e5a478b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5bfbdf243860/vmlinux-8e5a478b.xz kernel image: https://storage.googleapis.com/syzbot-assets/f43f1bae2625/bzImage-8e5a478b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: [email protected] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 UID: 0 PID: 6035 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:do_dentry_open+0xaf/0x14e0 fs/open.c:896 Code: 44 24 28 80 3c 28 00 74 08 4c 89 ff e8 fa 5e ef ff 4c 89 7c 24 20 4d 89 27 4d 8d 7c 24 30 4c 89 f8 48 c1 e8 03 48 89 44 24 58 <80> 3c 28 00 74 08 4c 89 ff e8 e3 5d ef ff 4c 89 7c 24 60 4d 8b 3f RSP: 0018:ffffc900037d7638 EFLAGS: 00010206 RAX: 0000000000000006 RBX: ffff88807217db60 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000ffffffff RBP: dffffc0000000000 R08: ffff88807b54d9b3 R09: 1ffff1100f6a9b36 R10: dffffc0000000000 R11: ffffed100f6a9b37 R12: 0000000000000000 R13: 1ffff1100e42fb7d R14: ffff88807217dbe8 R15: 0000000000000030 FS: 00005555907f6500(0000) GS:ffff888124de1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001000 CR3: 00000000772e8000 CR4: 00000000003526f0 Call Trace: <TASK> vfs_open+0x3b/0x340 fs/open.c:1081 backing_file_open_user_path+0x24/0x50 fs/file_table.c:73 backing_tmpfile_open+0x9b/0xf0 fs/backing-file.c:71 ovl_create_tmpfile fs/overlayfs/dir.c:1392 [inline] ovl_tmpfile+0x400/0x810 fs/overlayfs/dir.c:1449 vfs_tmpfile+0x3ff/0x890 fs/namei.c:4744 do_tmpfile+0xd3/0x240 fs/namei.c:4809 path_openat+0x300d/0x3860 fs/namei.c:4843 do_file_open+0x23e/0x4a0 fs/namei.c:4881 do_sys_openat2+0x113/0x200 fs/open.c:1366 do_sys_open fs/open.c:1372 [inline] __do_sys_open fs/open.c:1380 [inline] __se_sys_open fs/open.c:1376 [inline] __x64_sys_open+0x11e/0x150 fs/open.c:1376 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff99279c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff78638ef8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ff992a15fa0 RCX: 00007ff99279c799 RDX: 0000000000000028 RSI: 0000000000551083 RDI: 0000200000000040 RBP: 00007ff992832c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff992a15fac R14: 00007ff992a15fa0 R15: 00007ff992a15fa0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:do_dentry_open+0xaf/0x14e0 fs/open.c:896 Code: 44 24 28 80 3c 28 00 74 08 4c 89 ff e8 fa 5e ef ff 4c 89 7c 24 20 4d 89 27 4d 8d 7c 24 30 4c 89 f8 48 c1 e8 03 48 89 44 24 58 <80> 3c 28 00 74 08 4c 89 ff e8 e3 5d ef ff 4c 89 7c 24 60 4d 8b 3f RSP: 0018:ffffc900037d7638 EFLAGS: 00010206 RAX: 0000000000000006 RBX: ffff88807217db60 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000ffffffff RBP: dffffc0000000000 R08: ffff88807b54d9b3 R09: 1ffff1100f6a9b36 R10: dffffc0000000000 R11: ffffed100f6a9b37 R12: 0000000000000000 R13: 1ffff1100e42fb7d R14: ffff88807217dbe8 R15: 0000000000000030 FS: 00005555907f6500(0000) GS:ffff888124de1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001000 CR3: 00000000772e8000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 44 24 28 rex.R and $0x28,%al 3: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) 7: 74 08 je 0x11 9: 4c 89 ff mov %r15,%rdi c: e8 fa 5e ef ff call 0xffef5f0b 11: 4c 89 7c 24 20 mov %r15,0x20(%rsp) 16: 4d 89 27 mov %r12,(%r15) 19: 4d 8d 7c 24 30 lea 0x30(%r12),%r15 1e: 4c 89 f8 mov %r15,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 48 89 44 24 58 mov %rax,0x58(%rsp) * 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ff mov %r15,%rdi 33: e8 e3 5d ef ff call 0xffef5e1b 38: 4c 89 7c 24 60 mov %r15,0x60(%rsp) 3d: 4d 8b 3f mov (%r15),%r15 --- This report is generated by a bot. 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