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Message-ID: <67eaa162.050a0220.3c3d88.0044.GAE@google.com>
Date: Mon, 31 Mar 2025 07:06:26 -0700
From: syzbot <syzbot+cebfe3f22eeaff4ddd7c@...kaller.appspotmail.com>
To: kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org,
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [bcachefs?] KMSAN: uninit-value in bch2_copygc (2)
Hello,
syzbot found the following issue on:
HEAD commit: 1e1ba8d23dae Merge tag 'timers-clocksource-2025-03-26' of ..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15a8ede4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=887673359f1a92bf
dashboard link: https://syzkaller.appspot.com/bug?extid=cebfe3f22eeaff4ddd7c
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/97b3a10186d9/disk-1e1ba8d2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/de4a9446d205/vmlinux-1e1ba8d2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/529352453703/bzImage-1e1ba8d2.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cebfe3f22eeaff4ddd7c@...kaller.appspotmail.com
=====================================================
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:143 [inline]
BUG: KMSAN: uninit-value in bch2_copygc_get_buckets fs/bcachefs/movinggc.c:169 [inline]
BUG: KMSAN: uninit-value in bch2_copygc+0x1d5c/0x5e00 fs/bcachefs/movinggc.c:221
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:143 [inline]
bch2_copygc_get_buckets fs/bcachefs/movinggc.c:169 [inline]
bch2_copygc+0x1d5c/0x5e00 fs/bcachefs/movinggc.c:221
bch2_copygc_thread+0x7d2/0xf80 fs/bcachefs/movinggc.c:383
kthread+0x6b9/0xef0 kernel/kthread.c:464
ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Local variable b214.i created at:
bucket_in_flight fs/bcachefs/movinggc.c:-1 [inline]
bch2_copygc_get_buckets fs/bcachefs/movinggc.c:169 [inline]
bch2_copygc+0x159e/0x5e00 fs/bcachefs/movinggc.c:221
bch2_copygc_thread+0x7d2/0xf80 fs/bcachefs/movinggc.c:383
CPU: 1 UID: 0 PID: 5998 Comm: bch-copygc/loop Not tainted 6.14.0-syzkaller-03576-g1e1ba8d23dae #0 PREEMPT(undef)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
=====================================================
Kernel panic - not syncing: kmsan.panic set ...
CPU: 1 UID: 0 PID: 5998 Comm: bch-copygc/loop Tainted: G B 6.14.0-syzkaller-03576-g1e1ba8d23dae #0 PREEMPT(undef)
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x216/0x2d0 lib/dump_stack.c:120
dump_stack+0x1e/0x24 lib/dump_stack.c:129
panic+0x4e5/0xcf0 kernel/panic.c:354
kmsan_report+0x2ca/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:143 [inline]
bch2_copygc_get_buckets fs/bcachefs/movinggc.c:169 [inline]
bch2_copygc+0x1d5c/0x5e00 fs/bcachefs/movinggc.c:221
bch2_copygc_thread+0x7d2/0xf80 fs/bcachefs/movinggc.c:383
kthread+0x6b9/0xef0 kernel/kthread.c:464
ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
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