From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f80.google.com (mail-oo1-f80.google.com [209.85.161.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6ED45320CD3 for ; Sun, 31 May 2026 01:20:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780190430; cv=none; b=DEaOwB81eKcJzqQxTfftqbUtRb7111/sm36W9FxVFxDQPXqF8wrzsQtCXYYGLqNV5UkOaxzrpqRkj9WWeOBMtorEFSr6V3Kx2rDNiJnEFb1llCtrXZRhluCAzTl5Wlipu2iOYnUh1hcyxEKZRc5CLTQiNxXbsoedCKB2aZcZrGY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780190430; c=relaxed/simple; bh=8OyXgjc+ClKNVnnz4l/huDfPrC6PiDWrvQIPXLPWNY4=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; 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006d021491bc7-69e105ba640mr2530053eaf.52.1780190428486; Sat, 30 May 2026 18:20:28 -0700 (PDT) Date: Sat, 30 May 2026 18:20:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a1b8cdc.0a9e871e.332604.000f.GAE@google.com> Subject: [syzbot] [block?] general protection fault in ublk_queue_rq From: syzbot To: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tom.leiming@gmail.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 4b4362973b6f Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=165f17a6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f52fb4a6d220c448 dashboard link: https://syzkaller.appspot.com/bug?extid=415b9ec753cd2a196087 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15a33a0e580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=115f17a6580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/cdc9dd8cab69/disk-4b436297.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6bb74747f86d/vmlinux-4b436297.xz kernel image: https://storage.googleapis.com/syzbot-assets/a20d7153214f/Image-4b436297.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+415b9ec753cd2a196087@syzkaller.appspotmail.com Unable to handle kernel paging request at virtual address dfff800000000003 KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000003] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 4778 Comm: kworker/0:3 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: events ublk_partition_scan_work pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : ublk_queue_cmd drivers/block/ublk_drv.c:2095 [inline] pc : ublk_queue_rq+0x114/0x1dc drivers/block/ublk_drv.c:2223 lr : ublk_queue_cmd drivers/block/ublk_drv.c:2092 [inline] lr : ublk_queue_rq+0xec/0x1dc drivers/block/ublk_drv.c:2223 sp : ffff800099646b10 x29: ffff800099646b20 x28: ffff7000132c8d80 x27: ffff0000c610b280 x26: ffff0000c610b2c8 x25: 1fffe00018c21652 x24: dfff800000000000 x23: 0000000000000004 x22: 0000000000000002 x21: 0000000000000000 x20: ffff0000c610b280 x19: 0000000000000000 x18: 00000000ffffffff x17: ffff80008a186c80 x16: ffff80008a4b54f8 x15: ffff0000d9c0c550 x14: ffff0000d9c0c530 x13: 0000000000000001 x12: 0000000000000000 x11: ffff80008a3fcd08 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000003 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff800082559f20 x2 : 0000000000000004 x1 : ffff0000d9c0ba00 x0 : 0000000000000018 Call trace: ublk_queue_cmd drivers/block/ublk_drv.c:2095 [inline] (P) ublk_queue_rq+0x114/0x1dc drivers/block/ublk_drv.c:2223 (P) blk_mq_dispatch_rq_list+0x3bc/0x13a4 block/blk-mq.c:2148 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline] blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline] __blk_mq_sched_dispatch_requests+0xa40/0x10bc block/blk-mq-sched.c:307 blk_mq_sched_dispatch_requests+0xa4/0x154 block/blk-mq-sched.c:329 blk_mq_run_hw_queue+0x3c0/0x4dc block/blk-mq.c:2386 blk_mq_dispatch_list+0xa2c/0xb2c block/blk-mq.c:-1 blk_mq_flush_plug_list+0x3a4/0x484 block/blk-mq.c:2997 __blk_flush_plug+0x338/0x410 block/blk-core.c:1230 blk_finish_plug block/blk-core.c:1257 [inline] __submit_bio+0x39c/0x478 block/blk-core.c:649 __submit_bio_noacct_mq block/blk-core.c:722 [inline] submit_bio_noacct_nocheck+0x284/0xa98 block/blk-core.c:753 submit_bio_noacct+0xd90/0x1814 block/blk-core.c:884 submit_bio+0x38c/0x528 block/blk-core.c:926 blk_crypto_submit_bio include/linux/blk-crypto.h:203 [inline] submit_bh_wbc+0x4b0/0x594 fs/buffer.c:2737 submit_bh fs/buffer.c:2742 [inline] block_read_full_folio+0x69c/0x734 fs/buffer.c:2358 blkdev_read_folio+0x28/0x38 block/fops.c:494 filemap_read_folio+0xf0/0x2fc mm/filemap.c:2502 do_read_cache_folio+0x368/0x5b8 mm/filemap.c:4107 read_cache_folio+0x68/0x84 mm/filemap.c:4139 read_mapping_folio include/linux/pagemap.h:1017 [inline] read_part_sector+0xcc/0x708 block/partitions/core.c:724 adfspart_check_ICS+0xa4/0x6fc block/partitions/acorn.c:356 check_partition block/partitions/core.c:143 [inline] blk_add_partitions block/partitions/core.c:591 [inline] bdev_disk_changed+0x6fc/0x11c8 block/partitions/core.c:695 ublk_partition_scan_work+0x74/0xf4 drivers/block/ublk_drv.c:2467 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0x79c/0x1098 kernel/workqueue.c:3397 worker_thread+0x754/0xba0 kernel/workqueue.c:3478 kthread+0x2f8/0x3c8 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 Code: 979832c3 f94002b5 910062a0 d343fc08 (38786908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 979832c3 bl 0xfffffffffe60cb0c 4: f94002b5 ldr x21, [x21] 8: 910062a0 add x0, x21, #0x18 c: d343fc08 lsr x8, x0, #3 * 10: 38786908 ldrb w8, [x8, x24] <-- trapping instruction --- 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