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AHgh+RqBD/7VbY5UvQ+hEmvRja/qMRzqcVj3w7Ej8gsfBFxGi09aXlr+DS0eW3jABPZrR4om7mrTzY3tceYtxjs=@vger.kernel.org X-Gm-Message-State: AOJu0YxotpVOV+o6/46NF/Bseqx+FeK950lsNq6Pqc2/HoszHn4ZZNXJ vPsJi6mimvl7CVVgVtEsObZjd86LMOiE/gZ8iPj7BChyVEpjs6P1w02JHYMIGSX/Lwq00tN8ivX IABAlPaiFEi8bROoGYWedm+/8npXfe1uxRLpDWQtR918hUt2Yl80dqGnRjNw= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4b82:b0:6b0:4199:3cc4 with SMTP id 006d021491bc7-6b13c5d6b97mr7175092eaf.27.1787166817673; Wed, 19 Aug 2026 12:13:37 -0700 (PDT) Date: Wed, 19 Aug 2026 12:13:37 -0700 In-Reply-To: <6a74a7ea.01d0871a.3a0d52.0024.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a860061.ae6ddae5.3da009.0010.GAE@google.com> Subject: Re: [syzbot] [block?] WARNING in null_report_zones 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" syzbot has found a reproducer for the following issue on: HEAD commit: bd5f485f3f02 Merge tag 'soc-arm-7.3' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1168219e580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6d6c2a05eaadaf10 dashboard link: https://syzkaller.appspot.com/bug?extid=67f80b67c0cfaa3bb3bb compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15767815580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-bd5f485f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5a13ddf1c1fa/vmlinux-bd5f485f.xz kernel image: https://storage.googleapis.com/syzbot-assets/0dc17a20da2c/bzImage-bd5f485f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+67f80b67c0cfaa3bb3bb@syzkaller.appspotmail.com null_blk: nullb1: using native zone append ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(lock->magic != lock) WARNING: kernel/locking/mutex.c:625 at __mutex_lock_common kernel/locking/mutex.c:625 [inline], CPU#0: syz.0.17/5967 WARNING: kernel/locking/mutex.c:625 at __mutex_lock+0x944/0x1bc0 kernel/locking/mutex.c:821, CPU#0: syz.0.17/5967 Modules linked in: CPU: 0 UID: 0 PID: 5967 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline] RIP: 0010:__mutex_lock+0x94b/0x1bc0 kernel/locking/mutex.c:821 Code: 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 b4 10 00 00 44 8b 05 08 bf 81 05 45 85 c0 75 13 48 8d 3d 5c 1d 85 05 48 c7 c6 a0 df ef 8b <67> 48 0f b9 3a 90 e9 1b f8 ff ff 4d 8d a7 f0 0a 00 00 4c 89 e7 e8 RSP: 0018:ffffc9000634f680 EFLAGS: 00010246 RAX: 0000000000000003 RBX: ffff888047c00000 RCX: 1ffffffff2284a30 RDX: 0000000000000000 RSI: ffffffff8befdfa0 RDI: ffffffff9145afe0 RBP: ffffc9000634f7f0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: ffffed100ab768d4 FS: 00007fd5599d66c0(0000) GS:ffff8880d5bd4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000059f3c000 CR4: 0000000000352ef0 Call Trace: null_lock_zone drivers/block/null_blk/zoned.c:39 [inline] null_lock_zone drivers/block/null_blk/zoned.c:33 [inline] null_report_zones+0x4af/0x6f0 drivers/block/null_blk/zoned.c:219 blk_revalidate_disk_zones+0x492/0xce0 block/blk-zoned.c:2384 null_add_dev+0x125f/0x1df0 drivers/block/null_blk/main.c:2047 nullb_device_power_store+0x29d/0x350 drivers/block/null_blk/main.c:501 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6af/0x1050 fs/read_write.c:687 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd558b9e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd5599d6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fd558e25fa0 RCX: 00007fd558b9e0d9 RDX: 0000000000000001 RSI: 0000200000000700 RDI: 0000000000000004 RBP: 00007fd558c35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd558e26038 R14: 00007fd558e25fa0 R15: 00007fffab806348 ---------------- Code disassembly (best guess): 0: 0f b6 14 11 movzbl (%rcx,%rdx,1),%edx 4: 38 d0 cmp %dl,%al 6: 7c 08 jl 0x10 8: 84 d2 test %dl,%dl a: 0f 85 b4 10 00 00 jne 0x10c4 10: 44 8b 05 08 bf 81 05 mov 0x581bf08(%rip),%r8d # 0x581bf1f 17: 45 85 c0 test %r8d,%r8d 1a: 75 13 jne 0x2f 1c: 48 8d 3d 5c 1d 85 05 lea 0x5851d5c(%rip),%rdi # 0x5851d7f 23: 48 c7 c6 a0 df ef 8b mov $0xffffffff8befdfa0,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 90 nop 30: e9 1b f8 ff ff jmp 0xfffff850 35: 4d 8d a7 f0 0a 00 00 lea 0xaf0(%r15),%r12 3c: 4c 89 e7 mov %r12,%rdi 3f: e8 .byte 0xe8 --- 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.