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006d021491bc7-688c98d044cmr460071eaf.8.1775575830657; Tue, 07 Apr 2026 08:30:30 -0700 (PDT) Date: Tue, 07 Apr 2026 08:30:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69d52316.050a0220.28fc4.0000.GAE@google.com> Subject: [syzbot] [fuse?] linux-next test error: general protection fault in fuse_dev_alloc_install From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-next@vger.kernel.org, miklos@szeredi.hu, sfr@canb.auug.org.au, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: f3e6330d7fe4 Add linux-next specific files for 20260407 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=12f15302580000 kernel config: https://syzkaller.appspot.com/x/.config?x=aaf410acb26eb1e9 dashboard link: https://syzkaller.appspot.com/bug?extid=9b639ce94c265f1daf1f compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/49440d846e49/disk-f3e6330d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9eb3e67d6b50/vmlinux-f3e6330d.xz kernel image: https://storage.googleapis.com/syzbot-assets/162aa16f318d/bzImage-f3e6330d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9b639ce94c265f1daf1f@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000046: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000230-0x0000000000000237] CPU: 0 UID: 0 PID: 6098 Comm: syz.0.243 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:fuse_dev_install fs/fuse/dev.c:493 [inline] RIP: 0010:fuse_dev_alloc_install+0x39/0x80 fs/fuse/dev.c:508 Code: e8 bc f8 ff ff 48 89 c3 48 85 c0 74 47 e8 7f 57 7f fe 49 8d be 30 02 00 00 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 05 e8 6c 94 e9 fe 49 8b 96 30 02 00 00 49 c7 86 30 RSP: 0018:ffffc90004977710 EFLAGS: 00010202 RAX: 0000000000000046 RBX: ffff88802a4e8700 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff8e3178fe RDI: 0000000000000230 RBP: ffff888022375790 R08: ffffffff9074f1f7 R09: 1ffffffff20e9e3e R10: dffffc0000000000 R11: fffffbfff20e9e3f R12: ffff888028058840 R13: ffff888028058810 R14: 0000000000000000 R15: ffff888028058800 FS: 0000555594717500(0000) GS:ffff888124dd9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcdea32ba40 CR3: 0000000030fc2000 CR4: 00000000003526f0 Call Trace: cuse_channel_open+0x107/0x7c0 fs/fuse/cuse.c:524 misc_open+0x2d5/0x350 drivers/char/misc.c:163 chrdev_open+0x4cd/0x5e0 fs/char_dev.c:411 do_dentry_open+0x785/0x14e0 fs/open.c:947 vfs_open+0x3b/0x340 fs/open.c:1079 do_open fs/namei.c:4699 [inline] path_openat+0x2e08/0x3860 fs/namei.c:4858 do_file_open+0x23e/0x4a0 fs/namei.c:4887 do_sys_openat2+0x113/0x200 fs/open.c:1364 do_sys_open fs/open.c:1370 [inline] __do_sys_openat fs/open.c:1386 [inline] __se_sys_openat fs/open.c:1381 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1381 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcdea39c819 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:00007ffc7d8d7b88 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fcdea615fa0 RCX: 00007fcdea39c819 RDX: 0000000000000002 RSI: 0000200000000040 RDI: ffffffffffffff9c RBP: 00007fcdea432c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcdea615fac R14: 00007fcdea615fa0 R15: 00007fcdea615fa0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:fuse_dev_install fs/fuse/dev.c:493 [inline] RIP: 0010:fuse_dev_alloc_install+0x39/0x80 fs/fuse/dev.c:508 Code: e8 bc f8 ff ff 48 89 c3 48 85 c0 74 47 e8 7f 57 7f fe 49 8d be 30 02 00 00 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 05 e8 6c 94 e9 fe 49 8b 96 30 02 00 00 49 c7 86 30 RSP: 0018:ffffc90004977710 EFLAGS: 00010202 RAX: 0000000000000046 RBX: ffff88802a4e8700 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff8e3178fe RDI: 0000000000000230 RBP: ffff888022375790 R08: ffffffff9074f1f7 R09: 1ffffffff20e9e3e R10: dffffc0000000000 R11: fffffbfff20e9e3f R12: ffff888028058840 R13: ffff888028058810 R14: 0000000000000000 R15: ffff888028058800 FS: 0000555594717500(0000) GS:ffff888124dd9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056547c6ac660 CR3: 0000000030fc2000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: e8 bc f8 ff ff call 0xfffff8c1 5: 48 89 c3 mov %rax,%rbx 8: 48 85 c0 test %rax,%rax b: 74 47 je 0x54 d: e8 7f 57 7f fe call 0xfe7f5791 12: 49 8d be 30 02 00 00 lea 0x230(%r14),%rdi 19: 48 89 f8 mov %rdi,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 05 je 0x35 30: e8 6c 94 e9 fe call 0xfee994a1 35: 49 8b 96 30 02 00 00 mov 0x230(%r14),%rdx 3c: 49 rex.WB 3d: c7 .byte 0xc7 3e: 86 30 xchg %dh,(%rax) --- 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@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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