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Tue, 06 Oct 2026 15:11:21 -0700 (PDT) Date: Tue, 06 Oct 2026 15:11:21 -0700 In-Reply-To: <6ab0943c.514bccd6.255447.000a.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ac57209.353c8d8e.177895.000a.GAE@google.com> Subject: Re: [syzbot] [target?] WARNING in rd_configure_device From: syzbot To: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, mkp@kernel.org, syzkaller-bugs@googlegroups.com, target-devel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: eea3fef32a9c Add linux-next specific files for 20261006 git tree: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git console output: https://syzkaller.appspot.com/x/log.txt?x=1717fff5580000 kernel config: https://syzkaller.appspot.com/x/.config?x=36aaffb2bd6a0a93 dashboard link: https://syzkaller.appspot.com/bug?extid=fa495e1497c48a6ed885 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1097fff5580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+fa495e1497c48a6ed885@syzkaller.appspotmail.com ------------[ cut here ]------------ 1 WARNING: mm/slub.c:5459 at ___kmalloc_large_node+0x10c/0x170 mm/slub.c:5459, CPU#0: syz-executor320/5981 Modules linked in: CPU: 0 UID: 0 PID: 5981 Comm: syz-executor320 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:___kmalloc_large_node+0x10c/0x170 mm/slub.c:5459 Code: 41 c7 46 30 00 00 00 f8 eb 03 45 31 ff 4c 89 ff 48 89 de 89 ea 5b 41 5c 41 5e 41 5f 5d e9 5c ca 0b 00 c6 05 b8 ae 76 0e 01 90 <0f> 0b 90 31 c0 5b 41 5c 41 5e 41 5f 5d c3 cc cc cc cc cc 89 ef 89 RSP: 0018:ffffc90003287a88 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000004000000 RCX: 0000000000000000 RDX: 00000000ffffffff RSI: 0000000000000dc0 RDI: 0000000004000000 RBP: 0000000000000dc0 R08: ffffc90003287b47 R09: 1ffff92000650f68 R10: dffffc0000000000 R11: ffffffff86a6d4d0 R12: dffffc0000000000 R13: ffffffff86a6d5d9 R14: 0000000004000000 R15: 1ffff11006d1a2c3 FS: 000055558e991400(0000) GS:ffff888124633000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005560dd7ca000 CR3: 000000002755e000 CR4: 00000000003526f0 Call Trace: __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:5502 __do_kmalloc_node mm/slub.c:5519 [inline] __kmalloc_noprof+0x3f6/0x710 mm/slub.c:5556 _kmalloc_noprof include/linux/slab.h:995 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] rd_build_device_space drivers/target/target_core_rd.c:194 [inline] rd_configure_device+0x109/0x730 drivers/target/target_core_rd.c:294 target_configure_device+0x13c/0xa70 drivers/target/target_core_device.c:988 target_dev_enable_store+0x3e/0x80 drivers/target/target_core_configfs.c:2484 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x337/0x430 fs/configfs/file.c:229 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3f2d0cd537 Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffe88432110 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000055558e991400 RCX: 00007f3f2d0cd537 RDX: 0000000000000002 RSI: 00007f3f2d1060c3 RDI: 0000000000000003 RBP: 00007f3f2d108320 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007f3f2d1060c3 R13: 0000000000000002 R14: 00007f3f2d130cc0 R15: 0000000000000002 --- 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.