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AJvYcCWdcvO6j3tEA92VckCKo0sqsrPDKAOdjh1BkkLjeDBNY3+4N3tTWXg1oD4eqm8qCxquCIEKzOxMWyyRzH8=@vger.kernel.org X-Gm-Message-State: AOJu0YwseGTt9ibsH0hMTpr09YId0X51PGqOGhjkowJAiRC8OsB990U5 4VTjpFY1YIWsRiHptt3xrgUCdgxBt7FztNvji5D2/O2tKRY2wnmJj3obnudGPad+jPGiBFTXTRH DZp2Rj3h4SjFm+67tn3cSL/BijQCMnJ9xziQRBuYPQMCt1EYgcmZg75seSIU= 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:f02e:b0:674:4a89:d824 with SMTP id 006d021491bc7-67c22ef41b0mr4148569eaf.2.1774075562484; Fri, 20 Mar 2026 23:46:02 -0700 (PDT) Date: Fri, 20 Mar 2026 23:46:02 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69be3eaa.050a0220.3bf4de.0043.GAE@google.com> Subject: Re: [syzbot] [block?] general protection fault in bio_alloc_bioset From: syzbot To: eadavis@qq.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in bio_alloc_bioset Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 5172 Comm: jbd2/sda1-8 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:bio_init block/bio.c:214 [inline] RIP: 0010:bio_init_inline include/linux/bio.h:435 [inline] RIP: 0010:bio_alloc_bioset+0x67e/0xc30 block/bio.c:597 Code: 04 24 00 00 00 00 41 8d 46 ff 0f b7 d8 bf 04 00 00 00 89 de e8 33 6c 3c fd 66 83 fb 04 0f 83 db 00 00 00 4c 89 f8 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 ff e8 c4 cf a5 fd 49 c7 07 00 00 00 00 49 RSP: 0018:ffffc9000e6ef7e8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88803778bd00 RSI: 0000000000000000 RDI: 0000000000000004 RBP: dffffc0000000000 R08: ffffffff903445f7 R09: 1ffffffff20688be R10: dffffc0000000000 R11: fffffbfff20688bf R12: 0000000000092800 R13: ffffffff9a6ca840 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124ff3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2f6b59c76f CR3: 000000007cd28000 CR4: 00000000003526f0 Call Trace: bio_alloc include/linux/bio.h:373 [inline] submit_bh_wbc+0x22d/0x650 fs/buffer.c:2816 jbd2_journal_commit_transaction+0x2186/0x5ad0 fs/jbd2/commit.c:726 kjournald2+0x3e0/0x760 fs/jbd2/journal.c:201 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 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:bio_init block/bio.c:214 [inline] RIP: 0010:bio_init_inline include/linux/bio.h:435 [inline] RIP: 0010:bio_alloc_bioset+0x67e/0xc30 block/bio.c:597 Code: 04 24 00 00 00 00 41 8d 46 ff 0f b7 d8 bf 04 00 00 00 89 de e8 33 6c 3c fd 66 83 fb 04 0f 83 db 00 00 00 4c 89 f8 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 ff e8 c4 cf a5 fd 49 c7 07 00 00 00 00 49 RSP: 0018:ffffc9000e6ef7e8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88803778bd00 RSI: 0000000000000000 RDI: 0000000000000004 RBP: dffffc0000000000 R08: ffffffff903445f7 R09: 1ffffffff20688be R10: dffffc0000000000 R11: fffffbfff20688bf R12: 0000000000092800 R13: ffffffff9a6ca840 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124ff3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2f6b59c76f CR3: 000000007cd28000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 04 24 add $0x24,%al 2: 00 00 add %al,(%rax) 4: 00 00 add %al,(%rax) 6: 41 8d 46 ff lea -0x1(%r14),%eax a: 0f b7 d8 movzwl %ax,%ebx d: bf 04 00 00 00 mov $0x4,%edi 12: 89 de mov %ebx,%esi 14: e8 33 6c 3c fd call 0xfd3c6c4c 19: 66 83 fb 04 cmp $0x4,%bx 1d: 0f 83 db 00 00 00 jae 0xfe 23: 4c 89 f8 mov %r15,%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 ff mov %r15,%rdi 33: e8 c4 cf a5 fd call 0xfda5cffc 38: 49 c7 07 00 00 00 00 movq $0x0,(%r15) 3f: 49 rex.WB Tested on: commit: 785f0eb2 Add linux-next specific files for 20260320 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1646d0ca580000 kernel config: https://syzkaller.appspot.com/x/.config?x=22bf3527036b9be1 dashboard link: https://syzkaller.appspot.com/bug?extid=09ddb593eea76a158f42 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=1177a2f6580000