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Sun, 16 Aug 2026 08:50:33 -0700 (PDT) Date: Sun, 16 Aug 2026 08:50:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a81dc49.dbb3a75c.20434b.0037.GAE@google.com> Subject: [syzbot] [usb?] general protection fault in adsl_state_store From: syzbot To: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 3eb40771c00a Merge tag 'soc-fixes-7.2-3' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12fc9949580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1d67342c314f228d dashboard link: https://syzkaller.appspot.com/bug?extid=9b195c4f412ea5c4e56a compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17334679580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9b195c4f412ea5c4e56a@syzkaller.appspotmail.com cxacru_cm: 3 callbacks suppressed cxacru 5-1:1.0: send of cm 0x85 failed (-104) Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 0 UID: 0 PID: 6032 Comm: syz-executor219 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:adsl_state_store.cold+0x5d/0x15d drivers/usb/atm/cxacru.c:359 Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 74 05 e8 a3 89 27 01 48 8b 6d 78 b8 ff ff 37 00 48 c1 e0 2a 48 8d 7d 10 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e d5 00 00 00 8b 75 10 89 da 48 RSP: 0018:ffffc900038e7bb0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 00000000ffffff98 RCX: ffffffff87c43ce9 RDX: 0000000000000002 RSI: ffffffff8153789d RDI: 0000000000000010 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 00000000ffffff98 R11: ffffffff81d6107c R12: ffffc900038e7be8 R13: 0000000000000004 R14: ffff8880478ad800 R15: 1ffff9200071cf79 FS: 000055558821b400(0000) GS:ffff8880d5bde000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000560168e483b8 CR3: 00000000361a1000 CR4: 0000000000352ef0 Call Trace: dev_attr_store+0x58/0x80 drivers/base/core.c:2505 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6ac/0x1050 fs/read_write.c:687 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff46eca73de Code: 08 0f 85 f5 e2 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 90 41 57 41 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08 RSP: 002b:00007fffbb5e0ef8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000055558821b400 RCX: 00007ff46eca73de RDX: 0000000000000004 RSI: 00007ff46ecf2074 RDI: 0000000000000005 RBP: 000055558821d890 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff46ecf4540 R13: 0000000000000000 R14: 0000000000000005 R15: 00007ff46ecf4590 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:adsl_state_store.cold+0x5d/0x15d drivers/usb/atm/cxacru.c:359 Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 74 05 e8 a3 89 27 01 48 8b 6d 78 b8 ff ff 37 00 48 c1 e0 2a 48 8d 7d 10 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e d5 00 00 00 8b 75 10 89 da 48 RSP: 0018:ffffc900038e7bb0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 00000000ffffff98 RCX: ffffffff87c43ce9 RDX: 0000000000000002 RSI: ffffffff8153789d RDI: 0000000000000010 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 00000000ffffff98 R11: ffffffff81d6107c R12: ffffc900038e7be8 R13: 0000000000000004 R14: ffff8880478ad800 R15: 1ffff9200071cf79 FS: 000055558821b400(0000) GS:ffff8880d5cde000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb3d476b0f5 CR3: 00000000361a1000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 48 89 fa mov %rdi,%rdx 3: 48 c1 ea 03 shr $0x3,%rdx 7: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) b: 74 05 je 0x12 d: e8 a3 89 27 01 call 0x12789b5 12: 48 8b 6d 78 mov 0x78(%rbp),%rbp 16: b8 ff ff 37 00 mov $0x37ffff,%eax 1b: 48 c1 e0 2a shl $0x2a,%rax 1f: 48 8d 7d 10 lea 0x10(%rbp),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 74 08 je 0x3a 32: 3c 03 cmp $0x3,%al 34: 0f 8e d5 00 00 00 jle 0x10f 3a: 8b 75 10 mov 0x10(%rbp),%esi 3d: 89 da mov %ebx,%edx 3f: 48 rex.W --- 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