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AJvYcCWAm3UuA2MCx2EISG6hYsiwcGH+vfhHPOiqGMoWfsxXmpiWxK6e1+gEKKcFjGiTN4S7JRv7VAytul5NVVc=@vger.kernel.org X-Gm-Message-State: AOJu0YwLmm2oKhRtUGD6PK3MkOZGJvHyawlZhKeNp+eVnSELZKg7Wx/x A0aDTq9DqDeuhAbcKqyIkktROOWHl5mhwfLrUNLuVMnkSqXZqjCUmxt59bcvFVaJtoiKPH9LvZb LmCcLxFoL7qTXIsmD84bKQv15M24cj/0CSes73egICgCB9xA62yhow7y5xWY= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1405:b0:455:7fe4:b215 with SMTP id 5614622812f47-467e600f5a4mr2767714b6e.53.1774046669288; Fri, 20 Mar 2026 15:44:29 -0700 (PDT) Date: Fri, 20 Mar 2026 15:44:29 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69bdcdcd.050a0220.3bf4de.002f.GAE@google.com> Subject: [syzbot] [block?] general protection fault in bio_alloc_bioset From: syzbot To: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 8e42d2514a7e Add linux-next specific files for 20260318 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=10b35ed6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1da705b17f2649a3 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 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1325a06a580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/64c940773401/disk-8e42d251.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/aa7a94376665/vmlinux-8e42d251.xz kernel image: https://storage.googleapis.com/syzbot-assets/5a7ab603c859/bzImage-8e42d251.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+09ddb593eea76a158f42@syzkaller.appspotmail.com 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: 1116 Comm: kworker/u8:9 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: writeback wb_workfn (flush-8:0) 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+0x664/0xc10 block/bio.c:593 Code: 04 24 00 00 00 00 41 8d 46 ff 0f b7 d8 bf 04 00 00 00 89 de e8 6d b0 3a 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 3e 27 a4 fd 49 c7 07 00 00 00 00 49 RSP: 0000:ffffc9000576efe8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88802998bd00 RSI: 0000000000000000 RDI: 0000000000000004 RBP: dffffc0000000000 R08: ffffffff905435f7 R09: 1ffffffff20a86be R10: dffffc0000000000 R11: fffffbfff20a86bf R12: 0000000000092800 R13: ffffffff9a8dc840 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124de1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f51b88511d0 CR3: 0000000072570000 CR4: 00000000003526f0 Call Trace: bio_alloc include/linux/bio.h:373 [inline] submit_bh_wbc+0x22d/0x650 fs/buffer.c:2816 __block_write_full_folio+0x810/0xe10 fs/buffer.c:1930 blkdev_writepages+0xef/0x1b0 block/fops.c:486 do_writepages+0x32e/0x550 mm/page-writeback.c:2554 __writeback_single_inode+0x133/0x11a0 fs/fs-writeback.c:1750 writeback_sb_inodes+0x992/0x1a20 fs/fs-writeback.c:2042 __writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:2118 wb_writeback+0x46a/0xb70 fs/fs-writeback.c:2229 wb_check_start_all fs/fs-writeback.c:2355 [inline] wb_do_writeback fs/fs-writeback.c:2381 [inline] wb_workfn+0x95b/0xf50 fs/fs-writeback.c:2414 process_one_work+0x9ab/0x1780 kernel/workqueue.c:3288 process_scheduled_works kernel/workqueue.c:3379 [inline] worker_thread+0xba8/0x11e0 kernel/workqueue.c:3465 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+0x664/0xc10 block/bio.c:593 Code: 04 24 00 00 00 00 41 8d 46 ff 0f b7 d8 bf 04 00 00 00 89 de e8 6d b0 3a 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 3e 27 a4 fd 49 c7 07 00 00 00 00 49 RSP: 0000:ffffc9000576efe8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88802998bd00 RSI: 0000000000000000 RDI: 0000000000000004 RBP: dffffc0000000000 R08: ffffffff905435f7 R09: 1ffffffff20a86be R10: dffffc0000000000 R11: fffffbfff20a86bf R12: 0000000000092800 R13: ffffffff9a8dc840 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124de1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564154e50330 CR3: 000000005d868000 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 6d b0 3a fd call 0xfd3ab086 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 3e 27 a4 fd call 0xfda42776 38: 49 c7 07 00 00 00 00 movq $0x0,(%r15) 3f: 49 rex.WB --- 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