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AHgh+RrFZz1sX1iCNwhLOYwUAPqmsGVpkKYzOTGwWIUYIxdmDGYyRL13yOSxPafyuHlOCCzhjFIpgOFe0BVaYj0=@vger.kernel.org X-Gm-Message-State: AFuF++mgBWRr0GedVFKVcRIWFQG8k6jlB3z6rtflBAIpb3evbstWaEHP S2DHJMGlJm94dJzdkmXc2AYjAWHYkgL0re4MZQAMlhRmiAaw2F1Qw3ya4I0GrHvTa2BW8oNUk/b 4VEaBb6suyxSzlJmWJD70eZXEHYnkIagxCOtueCel0GI+zZpe7yJgPv06pfY= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:220b:b0:4b3:63a7:b955 with SMTP id 5614622812f47-4b397fa2c8dmr37057114b6e.7.1788234627728; Mon, 31 Aug 2026 20:50:27 -0700 (PDT) Date: Mon, 31 Aug 2026 20:50:27 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a964b83.99c12218.408a8.0001.GAE@google.com> Subject: [syzbot] [ext4?] general protection fault in __bh_submit From: syzbot To: jack@suse.com, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tytso@mit.edu Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 89c07d98716a Add linux-next specific files for 20260831 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1540fe25580000 kernel config: https://syzkaller.appspot.com/x/.config?x=32e7f0dfdb3435a4 dashboard link: https://syzkaller.appspot.com/bug?extid=41453ea05ab61c075f1f 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=13c81b79580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/43759091bf91/disk-89c07d98.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7c556aacad9a/vmlinux-89c07d98.xz kernel image: https://storage.googleapis.com/syzbot-assets/fa1ff3f317d0/bzImage-89c07d98.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+41453ea05ab61c075f1f@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 UID: 0 PID: 4943 Comm: jbd2/sda1-8 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:const_folio_flags include/linux/page-flags.h:345 [inline] RIP: 0010:folio_test_dropbehind include/linux/page-flags.h:601 [inline] RIP: 0010:__bh_submit+0x22d/0x8d0 fs/buffer.c:1109 Code: c1 e8 03 48 89 44 24 18 42 80 3c 20 00 74 08 48 89 df e8 56 d6 d7 ff 48 89 5c 24 28 48 8b 1b 4c 8d 7b 08 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 34 d6 d7 ff 4d 8b 3f 4c 89 fe 48 RSP: 0018:ffffc9000e64f868 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b9a0d9 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888075d24660 RBP: 0000000000009801 R08: ffff888075d246bf R09: 1ffff1100eba48d7 R10: dffffc0000000000 R11: ffffed100eba48d8 R12: dffffc0000000000 R13: ffff888075d24640 R14: ffff88807045fc40 R15: 0000000000000008 FS: 0000000000000000(0000) GS:ffff888124866000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f10e87e8008 CR3: 00000000603f2000 CR4: 00000000003526f0 Call Trace: jbd2_journal_commit_transaction+0x22a9/0x5cd0 fs/jbd2/commit.c:751 kjournald2+0x3bc/0x750 fs/jbd2/journal.c:200 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:const_folio_flags include/linux/page-flags.h:345 [inline] RIP: 0010:folio_test_dropbehind include/linux/page-flags.h:601 [inline] RIP: 0010:__bh_submit+0x22d/0x8d0 fs/buffer.c:1109 Code: c1 e8 03 48 89 44 24 18 42 80 3c 20 00 74 08 48 89 df e8 56 d6 d7 ff 48 89 5c 24 28 48 8b 1b 4c 8d 7b 08 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 34 d6 d7 ff 4d 8b 3f 4c 89 fe 48 RSP: 0018:ffffc9000e64f868 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b9a0d9 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888075d24660 RBP: 0000000000009801 R08: ffff888075d246bf R09: 1ffff1100eba48d7 R10: dffffc0000000000 R11: ffffed100eba48d8 R12: dffffc0000000000 R13: ffff888075d24640 R14: ffff88807045fc40 R15: 0000000000000008 FS: 0000000000000000(0000) GS:ffff888124866000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f10e952312d CR3: 000000007ff14000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: c1 e8 03 shr $0x3,%eax 3: 48 89 44 24 18 mov %rax,0x18(%rsp) 8: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) d: 74 08 je 0x17 f: 48 89 df mov %rbx,%rdi 12: e8 56 d6 d7 ff call 0xffd7d66d 17: 48 89 5c 24 28 mov %rbx,0x28(%rsp) 1c: 48 8b 1b mov (%rbx),%rbx 1f: 4c 8d 7b 08 lea 0x8(%rbx),%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ff mov %r15,%rdi 34: e8 34 d6 d7 ff call 0xffd7d66d 39: 4d 8b 3f mov (%r15),%r15 3c: 4c 89 fe mov %r15,%rsi 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