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006d021491bc7-662f20548d3mr2595744eaf.12.1769560470093; Tue, 27 Jan 2026 16:34:30 -0800 (PST) Date: Tue, 27 Jan 2026 16:34:30 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69795996.050a0220.c9109.0029.GAE@google.com> Subject: [syzbot] [serial?] general protection fault in to_utf8 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: 615aad0f61e0 Add linux-next specific files for 20260126 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=147b432a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d51c584a7396ddf1 dashboard link: https://syzkaller.appspot.com/bug?extid=3f83d97f1d51ddaabd8a 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=16201fb3980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11bba802580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5318e5f027be/disk-615aad0f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d165e561fa49/vmlinux-615aad0f.xz kernel image: https://storage.googleapis.com/syzbot-assets/fb0e01c90aa5/bzImage-615aad0f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3f83d97f1d51ddaabd8a@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000038: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000001c0-0x00000000000001c7] CPU: 1 UID: 0 PID: 6053 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 RIP: 0010:__queue_work+0xa2/0xf90 kernel/workqueue.c:2269 Code: 11 31 ff 89 ee e8 4e f4 37 00 85 ed 0f 85 ef 0c 00 00 e8 01 f0 37 00 4d 8d b7 c0 01 00 00 4c 89 f0 48 c1 e8 03 48 89 44 24 28 <42> 0f b6 04 20 84 c0 0f 85 22 0d 00 00 4c 89 34 24 41 8b 2e 89 ee RSP: 0018:ffffc900036c7318 EFLAGS: 00010002 RAX: 0000000000000038 RBX: 0000000000000008 RCX: ffff88802f848000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff88813ff72017 R09: 1ffff11027fee402 R10: dffffc0000000000 R11: ffffed1027fee403 R12: dffffc0000000000 R13: ffff88813ff72010 R14: 00000000000001c0 R15: 0000000000000000 FS: 0000555556b5d500(0000) GS:ffff8881253b4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31663fff CR3: 0000000075e7c000 CR4: 00000000003526f0 Call Trace: queue_work_on+0x106/0x1d0 kernel/workqueue.c:2405 put_queue drivers/tty/vt/keyboard.c:328 [inline] to_utf8+0x872/0x1ad0 drivers/tty/vt/keyboard.c:-1 put_queue_utf8 drivers/tty/vt/keyboard.c:382 [inline] k_unicode drivers/tty/vt/keyboard.c:683 [inline] k_self+0x326/0x7e0 drivers/tty/vt/keyboard.c:701 kbd_keycode drivers/tty/vt/keyboard.c:1497 [inline] kbd_event+0x2ec1/0x40d0 drivers/tty/vt/keyboard.c:1515 input_handle_events_default+0xd4/0x1a0 drivers/input/input.c:2541 input_pass_values+0x288/0x890 drivers/input/input.c:128 input_event_dispose+0x330/0x6b0 drivers/input/input.c:342 input_inject_event+0x1dd/0x340 drivers/input/input.c:424 evdev_write+0x325/0x4c0 drivers/input/evdev.c:528 vfs_write+0x29a/0xb90 fs/read_write.c:686 ksys_write+0x150/0x270 fs/read_write.c:740 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa3fd19aeb9 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:00007fffb1030708 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa3fd415fa0 RCX: 00007fa3fd19aeb9 RDX: 0000000000002250 RSI: 0000200000000040 RDI: 0000000000000003 RBP: 00007fa3fd208c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa3fd415fac R14: 00007fa3fd415fa0 R15: 00007fa3fd415fa0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__queue_work+0xa2/0xf90 kernel/workqueue.c:2269 Code: 11 31 ff 89 ee e8 4e f4 37 00 85 ed 0f 85 ef 0c 00 00 e8 01 f0 37 00 4d 8d b7 c0 01 00 00 4c 89 f0 48 c1 e8 03 48 89 44 24 28 <42> 0f b6 04 20 84 c0 0f 85 22 0d 00 00 4c 89 34 24 41 8b 2e 89 ee RSP: 0018:ffffc900036c7318 EFLAGS: 00010002 RAX: 0000000000000038 RBX: 0000000000000008 RCX: ffff88802f848000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff88813ff72017 R09: 1ffff11027fee402 R10: dffffc0000000000 R11: ffffed1027fee403 R12: dffffc0000000000 R13: ffff88813ff72010 R14: 00000000000001c0 R15: 0000000000000000 FS: 0000555556b5d500(0000) GS:ffff8881253b4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31663fff CR3: 0000000075e7c000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 31 ff xor %edi,%edi 2: 89 ee mov %ebp,%esi 4: e8 4e f4 37 00 call 0x37f457 9: 85 ed test %ebp,%ebp b: 0f 85 ef 0c 00 00 jne 0xd00 11: e8 01 f0 37 00 call 0x37f017 16: 4d 8d b7 c0 01 00 00 lea 0x1c0(%r15),%r14 1d: 4c 89 f0 mov %r14,%rax 20: 48 c1 e8 03 shr $0x3,%rax 24: 48 89 44 24 28 mov %rax,0x28(%rsp) * 29: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 22 0d 00 00 jne 0xd58 36: 4c 89 34 24 mov %r14,(%rsp) 3a: 41 8b 2e mov (%r14),%ebp 3d: 89 ee mov %ebp,%esi --- 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