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AJvYcCWLgCFYyp0Fd4JlvDH5cOPJTkI6kGCRkQzsMVlJ6FZVzPeM49Cg98anqmBMVEXhsi1kE+q4jIT9QGQkkic=@vger.kernel.org X-Gm-Message-State: AOJu0YyZz6te4iEYniIByNqPj13kl0BUPE65RffecAANf5kR61v/Z237 3muRrDG218lMJnjC0dZcTYfzavvEtiFyeF2tl6wNXz/Sr4PpJ/2dItDbQSHBPcLzk89oOYFk84I I1+zxhb7FJ61cCXL8qlibzfiC7CL0FrkQWOtFT0RXACDlE35SAhrfM3K8bpo= X-Google-Smtp-Source: AGHT+IHBT7DTZEGxAOZYWpHTes750AEJWQKD32H1tP+pCIa9zxYfigQhdZ5lXYfPESvvwcfciU1M0aHUoKTMrL0xl5+xAc9XQSLO Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1aa1:b0:3f6:618f:6b2b with SMTP id e9e14a558f8ab-3fd87c4d5b5mr128088375ab.28.1757357130483; Mon, 08 Sep 2025 11:45:30 -0700 (PDT) Date: Mon, 08 Sep 2025 11:45:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68bf244a.050a0220.192772.0882.GAE@google.com> Subject: [syzbot] [serial?] general protection fault in vc_deallocate From: syzbot To: gregkh@linuxfoundation.org, jirislaby@kernel.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 3e8e5822146b Add linux-next specific files for 20250908 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=11984642580000 kernel config: https://syzkaller.appspot.com/x/.config?x=69cfefa929ab96f7 dashboard link: https://syzkaller.appspot.com/bug?extid=f6cb41c144427dc0796a compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17230934580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15984642580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/eaa87d8bc6ca/disk-3e8e5822.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6640e70f5002/vmlinux-3e8e5822.xz kernel image: https://storage.googleapis.com/syzbot-assets/40f622291050/bzImage-3e8e5822.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f6cb41c144427dc0796a@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc00000000b2: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000590-0x0000000000000597] CPU: 0 UID: 0 PID: 6062 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:vc_deallocate+0x303/0x3e0 drivers/tty/vt/vt.c:1345 Code: e8 f2 1f d7 fc 49 c7 07 00 00 00 00 eb 0e e8 14 1d 73 fc eb 05 e8 0d 1d 73 fc 31 db 4c 8d b3 90 05 00 00 4d 89 f4 49 c1 ec 03 <43> 80 3c 2c 00 74 08 4c 89 f7 e8 ce 1e d7 fc 4d 8b 3e 4d 85 ff 74 RSP: 0018:ffffc900035f79e0 EFLAGS: 00010206 RAX: ffffffff854c8f03 RBX: 0000000000000000 RCX: ffff88807dd3dac0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000003f RBP: ffffc900035f7a90 R08: ffffffff8fc3c7cf R09: 1ffffffff1f878f9 R10: dffffc0000000000 R11: fffffbfff1f878fa R12: 00000000000000b2 R13: dffffc0000000000 R14: 0000000000000590 R15: ffffffff9a034a30 FS: 000055557fa10500(0000) GS:ffff8881259f1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055557fa10808 CR3: 000000007ba62000 CR4: 00000000003526f0 Call Trace: vt_disallocate_all+0x60/0xe0 drivers/tty/vt/vt_ioctl.c:652 vt_ioctl+0x1adc/0x1f20 drivers/tty/vt/vt_ioctl.c:886 tty_ioctl+0x926/0xde0 drivers/tty/tty_io.c:2792 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f97fa38ebe9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe553801c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f97fa5c5fa0 RCX: 00007f97fa38ebe9 RDX: 0000000000000000 RSI: 0000000000005608 RDI: 0000000000000004 RBP: 00007f97fa411e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f97fa5c5fa0 R14: 00007f97fa5c5fa0 R15: 0000000000000002 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:vc_deallocate+0x303/0x3e0 drivers/tty/vt/vt.c:1345 Code: e8 f2 1f d7 fc 49 c7 07 00 00 00 00 eb 0e e8 14 1d 73 fc eb 05 e8 0d 1d 73 fc 31 db 4c 8d b3 90 05 00 00 4d 89 f4 49 c1 ec 03 <43> 80 3c 2c 00 74 08 4c 89 f7 e8 ce 1e d7 fc 4d 8b 3e 4d 85 ff 74 RSP: 0018:ffffc900035f79e0 EFLAGS: 00010206 RAX: ffffffff854c8f03 RBX: 0000000000000000 RCX: ffff88807dd3dac0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000003f RBP: ffffc900035f7a90 R08: ffffffff8fc3c7cf R09: 1ffffffff1f878f9 R10: dffffc0000000000 R11: fffffbfff1f878fa R12: 00000000000000b2 R13: dffffc0000000000 R14: 0000000000000590 R15: ffffffff9a034a30 FS: 000055557fa10500(0000) GS:ffff8881259f1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055557fa10808 CR3: 000000007ba62000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: e8 f2 1f d7 fc call 0xfcd71ff7 5: 49 c7 07 00 00 00 00 movq $0x0,(%r15) c: eb 0e jmp 0x1c e: e8 14 1d 73 fc call 0xfc731d27 13: eb 05 jmp 0x1a 15: e8 0d 1d 73 fc call 0xfc731d27 1a: 31 db xor %ebx,%ebx 1c: 4c 8d b3 90 05 00 00 lea 0x590(%rbx),%r14 23: 4d 89 f4 mov %r14,%r12 26: 49 c1 ec 03 shr $0x3,%r12 * 2a: 43 80 3c 2c 00 cmpb $0x0,(%r12,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 ce 1e d7 fc call 0xfcd71f07 39: 4d 8b 3e mov (%r14),%r15 3c: 4d 85 ff test %r15,%r15 3f: 74 .byte 0x74 --- 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 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