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AJvYcCW4TftyuH6QYMwbIPpaUzq/yEKSAuzpW/+KT+Tg3Wsz/NTXogwEZDxnS4mpw3BpFkDolJtVfB5hGBaY/Fg=@vger.kernel.org X-Gm-Message-State: AOJu0Yygi6DiLIXb3W+vihrpZGeibaPQLJcaLB+nRKErGgw54UrK0s1Q BF7B8oOCUI4VUNS0FSnmAZdCHbth9FRgbEvLo/Q31KeBSymBxNPBwCtWU/lg/xN71kmsciyX2Sj BhGBd0OeSpxcjE/XSxCoDGWqGily8Wf+1MrQ4H/etP6pxoFbtG1J3xmE= X-Google-Smtp-Source: AGHT+IGyghi6kOcG3rB5k1wRzHAsz3nmfeMABM8tI8oKNd1/jauj+ZMc6fPW9c3BfbpeIs24irDtCLxSmYvR0jtVmp7qedjQQ/ka Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a92:c88b:0:b0:3a0:ce43:fb62 with SMTP id e9e14a558f8ab-3a6f11d4c97mr96226615ab.11.1731286443694; Sun, 10 Nov 2024 16:54:03 -0800 (PST) Date: Sun, 10 Nov 2024 16:54:03 -0800 In-Reply-To: <2a46b846-9279-4cde-91c9-b01fc77e9052@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <673155ab.050a0220.1fb99c.013d.GAE@google.com> Subject: Re: [syzbot] [bcachefs?] KMSAN: uninit-value in bch2_copygc From: syzbot To: gianf.trad@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KMSAN: uninit-value in bch2_copygc ===================================================== BUG: KMSAN: uninit-value in rht_ptr_rcu include/linux/rhashtable.h:376 [inline] BUG: KMSAN: uninit-value in __rhashtable_lookup include/linux/rhashtable.h:607 [inline] BUG: KMSAN: uninit-value in rhashtable_lookup include/linux/rhashtable.h:646 [inline] BUG: KMSAN: uninit-value in rhashtable_lookup_fast include/linux/rhashtable.h:672 [inline] BUG: KMSAN: uninit-value in bucket_in_flight fs/bcachefs/movinggc.c:145 [inline] BUG: KMSAN: uninit-value in bch2_copygc_get_buckets fs/bcachefs/movinggc.c:171 [inline] BUG: KMSAN: uninit-value in bch2_copygc+0x1d3f/0x58f0 fs/bcachefs/movinggc.c:222 rht_ptr_rcu include/linux/rhashtable.h:376 [inline] __rhashtable_lookup include/linux/rhashtable.h:607 [inline] rhashtable_lookup include/linux/rhashtable.h:646 [inline] rhashtable_lookup_fast include/linux/rhashtable.h:672 [inline] bucket_in_flight fs/bcachefs/movinggc.c:145 [inline] bch2_copygc_get_buckets fs/bcachefs/movinggc.c:171 [inline] bch2_copygc+0x1d3f/0x58f0 fs/bcachefs/movinggc.c:222 bch2_copygc_thread+0x83a/0xff0 fs/bcachefs/movinggc.c:383 kthread+0x3e2/0x540 kernel/kthread.c:389 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Local variable b205.i created at: bch2_copygc_get_buckets fs/bcachefs/movinggc.c:171 [inline] bch2_copygc+0x15b3/0x58f0 fs/bcachefs/movinggc.c:222 bch2_copygc_thread+0x83a/0xff0 fs/bcachefs/movinggc.c:383 CPU: 1 UID: 0 PID: 6672 Comm: bch-copygc/loop Not tainted 6.12.0-rc7-syzkaller-g2d5404caa8c7-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 ===================================================== Kernel panic - not syncing: kmsan.panic set ... CPU: 1 UID: 0 PID: 6672 Comm: bch-copygc/loop Tainted: G B 6.12.0-rc7-syzkaller-g2d5404caa8c7-dirty #0 Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x216/0x2d0 lib/dump_stack.c:120 dump_stack+0x1e/0x30 lib/dump_stack.c:129 panic+0x4e2/0xcf0 kernel/panic.c:354 kmsan_report+0x2c7/0x2d0 mm/kmsan/report.c:218 __msan_warning+0x95/0x120 mm/kmsan/instrumentation.c:318 rht_ptr_rcu include/linux/rhashtable.h:376 [inline] __rhashtable_lookup include/linux/rhashtable.h:607 [inline] rhashtable_lookup include/linux/rhashtable.h:646 [inline] rhashtable_lookup_fast include/linux/rhashtable.h:672 [inline] bucket_in_flight fs/bcachefs/movinggc.c:145 [inline] bch2_copygc_get_buckets fs/bcachefs/movinggc.c:171 [inline] bch2_copygc+0x1d3f/0x58f0 fs/bcachefs/movinggc.c:222 bch2_copygc_thread+0x83a/0xff0 fs/bcachefs/movinggc.c:383 kthread+0x3e2/0x540 kernel/kthread.c:389 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Kernel Offset: disabled Rebooting in 86400 seconds.. Tested on: commit: 2d5404ca Linux 6.12-rc7 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=115e135f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=dcca673786a14715 dashboard link: https://syzkaller.appspot.com/bug?extid=8689d10f1894eedf774d compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=168608c0580000