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Fri, 25 Sep 2026 11:02:43 -0700 (PDT) Date: Fri, 25 Sep 2026 11:02:43 -0700 In-Reply-To: <6ab10ffa.a6af0033.177e91.0014.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ab6b743.7eec07f4.c25c.0006.GAE@google.com> Subject: Re: [syzbot] [raid?] WARNING in free_conf From: syzbot To: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, magiclinan@didiglobal.com, song@kernel.org, syzkaller-bugs@googlegroups.com, xiao@kernel.org, yukuai@fnnas.com, yukuai@fygo.io Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 165768bb7026 Merge tag 'firewire-fixes-7.3-rc5' of git://g.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=15160205580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9d4242cb1c54cdf7 dashboard link: https://syzkaller.appspot.com/bug?extid=6a132745caefcf42cb0d 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=1039d205580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6a132745caefcf42cb0d@syzkaller.appspotmail.com Object 0xffff8880541a09b0 @offset=2480 Object 0xffff8880541a0e88 @offset=3720 Object 0xffff8880541a1360 @offset=4960 Object 0xffff8880541a1838 @offset=6200 Object 0xffff8880541a1d10 @offset=7440 Object 0xffff8880541a21e8 @offset=8680 Object 0xffff8880541a26c0 @offset=9920 Slab 0xffffea0001506800 objects=13 used=7 fp=0xffff8880541a0000 flags=0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) Disabling lock debugging due to kernel taint ------------[ cut here ]------------ 1 WARNING: mm/slub.c:1268 at __slab_err+0x15/0x20 mm/slub.c:1268, CPU#1: syz-executor938/6015 Modules linked in: CPU: 1 UID: 0 PID: 6015 Comm: syz-executor938 Tainted: G B syzkaller #0 PREEMPT(full) Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026 RIP: 0010:__slab_err+0x15/0x20 mm/slub.c:1268 Code: 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e8 2b 00 00 00 bf 05 00 00 00 be 01 00 00 00 e8 9c 0f 5f 00 90 <0f> 0b 90 e9 5e 04 e8 ff cc 66 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900036ff840 EFLAGS: 00010093 RAX: ffffffff81874cda RBX: ffff888028866280 RCX: ffff888030b89f40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff9399d0a7 R09: 1ffffffff2733a14 R10: dffffc0000000000 R11: fffffbfff2733a15 R12: ffffea000158e510 R13: ffffea0001506800 R14: ffffc900036ff858 R15: ffff8880333cf3c0 FS: 000055555e3d3400(0000) GS:ffff888124dca000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2017871ac0 CR3: 000000007c35a000 CR4: 0000000000350ef0 Call Trace: free_partial mm/slub.c:8122 [inline] __kmem_cache_shutdown+0x1a5/0x2b0 mm/slub.c:8165 kmem_cache_destroy+0x9d/0x180 mm/slab_common.c:576 shrink_stripes drivers/md/raid5.c:2719 [inline] free_conf+0x1fc/0x5d0 drivers/md/raid5.c:7553 setup_conf+0x1720/0x2ad0 drivers/md/raid5.c:7885 raid5_takeover_raid1 drivers/md/raid5.c:8934 [inline] raid5_takeover+0x641/0x8d0 drivers/md/raid5.c:9045 level_store+0x83b/0x1d10 drivers/md/md.c:4134 md_attr_store+0x3b7/0x640 drivers/md/md.c:6158 kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345 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: 0033:0x7fadcdd27cb7 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:00007ffef54c24b0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000055555e3d3400 RCX: 00007fadcdd27cb7 RDX: 0000000000000005 RSI: 00007fadcdd610f1 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000002 R13: 00000000000000c8 R14: 00007ffef54c2500 R15: 00007ffef54c2520 --- 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.