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:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=F+zi5c/D/eLjxbBxGGdpVtcBi2Id26yeXN6Ga0EceqI=; b=kjJ+L8Wzj8yTmbkpfeEGuuMXWSB3ZFNn1Hl6OfEQWvas1kL9CmztAmTbIXwO9rlv12 ImiWTqdOAaD4e/zPAR1qxGKgHKSdtIJqmRSlkcBOVmfRRCx5qZWYXj5r5z0ayLzDxh0g /YRD3GakB9ODpscHSs9OoSdtl9Ad+1PlZDRQqDQQhOVF5y/TLMUu+V5uDwhxkrbQysKK 8rBXzdHvW4spzR3wKzabCse6mgI+ifPQd7UaZ5dxRY+ImZB5m7B8iPi/d+J4XQK7zi6T y1FBqJh/yH5NY5B5smpVSAs3UfkZw/YiHnpye07Dl3R6GdRbRKgwIAW1wrVMgn1krxnS NCpA== X-Gm-Message-State: AOJu0YyVfdv3vtoZy+1VP/cWwiQdgIzpPUPtMNaaIZC4MHaSd9NxIO1t qNdn8O894uGzVtbNcKda8cIp1bxLOqb5ysNelDycrvPNMqItdu9hLyA86Mhi9iD3igTHCWByN4T 7D1ttGDwe4VtAHQAm5CFt7+6jF2MS45Mr8Jxc9DNzgG7SSkKaDW8NVT/dKPdg9A== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4b88:b0:6a3:c6f8:4caa with SMTP id 006d021491bc7-6ae96c10045mr8041016eaf.2.1786030597480; Thu, 06 Aug 2026 08:36:37 -0700 (PDT) Date: Thu, 06 Aug 2026 08:36:37 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a74aa05.01d0871a.3a0d52.0027.GAE@google.com> Subject: [syzbot] [linux1394?] general protection fault in ar_context_release From: syzbot To: linux-kernel@vger.kernel.org, linux1394-devel@lists.sourceforge.net, o-takashi@sakamocchi.jp, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 848acc8ffe1b Merge tag 'fsverity-for-linus' of git://git.k.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=11f46cc6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4e38b15c29e6a1d9 dashboard link: https://syzkaller.appspot.com/bug?extid=d30aad27833a559defab compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15837649580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11a693b9580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/9bf3ffd710de/disk-848acc8f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/770c0a63a80c/vmlinux-848acc8f.xz kernel image: https://storage.googleapis.com/syzbot-assets/c54f9393cb03/bzImage-848acc8f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d30aad27833a559defab@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 1 UID: 0 PID: 5635 Comm: syz-executor890 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:ar_context_release+0x3f/0x380 drivers/firewire/ohci.c:543 Code: ff df e8 04 56 74 fa 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 0f ef e1 fa 4c 8b 33 49 83 c6 08 4c 89 f0 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 f7 e8 f3 ee e1 fa 4d 8b 3e 4c 8d 63 48 4d RSP: 0018:ffffc90003707a30 EFLAGS: 00010212 RAX: 0000000000000001 RBX: ffff88803580c9c0 RCX: ffff88807f550000 RDX: 0000000000000000 RSI: ffff88803580c038 RDI: ffff88803580c9c0 RBP: dffffc0000000000 R08: ffffffff90579d37 R09: 1ffffffff20af3a6 R10: dffffc0000000000 R11: ffffffff812dfe10 R12: ffff88803580c000 R13: dffffc0000000000 R14: 0000000000000008 R15: ffffc90003707ac0 FS: 000055558e6e2400(0000) GS:ffff88812504b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562371f1a150 CR3: 000000007b54d000 CR4: 0000000000350ef0 Call Trace: release_ohci+0x3f/0x60 drivers/firewire/ohci.c:3567 release_nodes drivers/base/devres.c:546 [inline] devres_release_all+0x1a8/0x260 drivers/base/devres.c:576 device_unbind_cleanup drivers/base/dd.c:597 [inline] really_probe+0x451/0xae0 drivers/base/dd.c:772 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 device_driver_attach+0xe0/0x1d0 drivers/base/dd.c:1203 bind_store+0x1d0/0x220 drivers/base/bus.c:267 kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdb76e15649 Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffcdb4998a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007fdb76e15649 RDX: 000000000000000d RSI: 0000200000000180 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000006 R09: 0000000000000006 R10: 0000000000000006 R11: 0000000000000246 R12: 00007ffcdb499a18 R13: 0000200000000004 R14: 00007fdb76ea8c40 R15: 0000000000000002 Modules linked in: ---[ end trace 0000000000000000 ]--- R13: dffffc0000000000 R14: 0000000000000008 R15: ffffc90003707ac0 FS: 000055558e6e2400(0000) GS:ffff888124f4b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc34a7f2708 CR3: 000000007b54d000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: ff lcall (bad) 1: df e8 fucomip %st(0),%st 3: 04 56 add $0x56,%al 5: 74 fa je 0x1 7: 48 89 d8 mov %rbx,%rax a: 48 c1 e8 03 shr $0x3,%rax e: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) 12: 74 08 je 0x1c 14: 48 89 df mov %rbx,%rdi 17: e8 0f ef e1 fa call 0xfae1ef2b 1c: 4c 8b 33 mov (%rbx),%r14 1f: 49 83 c6 08 add $0x8,%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 f7 mov %r14,%rdi 33: e8 f3 ee e1 fa call 0xfae1ef2b 38: 4d 8b 3e mov (%r14),%r15 3b: 4c 8d 63 48 lea 0x48(%rbx),%r12 3f: 4d rex.WRB --- 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