Hello,
syzbot found the following issue on:
HEAD commit: 2e1b3cc9d7f7 Merge tag 'arm-fixes-6.12-2' of git://git.ker..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11361d5f980000
kernel config: https://syzkaller.appspot.com/x/.config?x=6fdf74cce377223b
dashboard link: https://syzkaller.appspot.com/bug?extid=8689d10f1894eedf774d
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12348f40580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11e7b587980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/08456e37db58/disk-2e1b3cc9.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cc957f7ba80b/vmlinux-2e1b3cc9.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7579fe72ed89/bzImage-2e1b3cc9.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/5903d7d7fe58/mount_4.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8689d10f1894eedf774d@xxxxxxxxxxxxxxxxxxxxxxxxx
=====================================================
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:144 [inline]
BUG: KMSAN: uninit-value in bch2_copygc_get_buckets fs/bcachefs/movinggc.c:170 [inline]
BUG: KMSAN: uninit-value in bch2_copygc+0x1d3f/0x58f0 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:144 [inline]
bch2_copygc_get_buckets fs/bcachefs/movinggc.c:170 [inline]
bch2_copygc+0x1d3f/0x58f0 fs/bcachefs/movinggc.c:221
bch2_copygc_thread+0x7f7/0xfa0 fs/bcachefs/movinggc.c:381
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:170 [inline]
bch2_copygc+0x15b3/0x58f0 fs/bcachefs/movinggc.c:221
bch2_copygc_thread+0x7f7/0xfa0 fs/bcachefs/movinggc.c:381
CPU: 0 UID: 0 PID: 5796 Comm: bch-copygc/loop Not tainted 6.12.0-rc6-syzkaller-00077-g2e1b3cc9d7f7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================
Kernel panic - not syncing: kmsan.panic set ...
CPU: 0 UID: 0 PID: 5796 Comm: bch-copygc/loop Tainted: G B 6.12.0-rc6-syzkaller-00077-g2e1b3cc9d7f7 #0
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
<TASK>
__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:144 [inline]
bch2_copygc_get_buckets fs/bcachefs/movinggc.c:170 [inline]
bch2_copygc+0x1d3f/0x58f0 fs/bcachefs/movinggc.c:221
bch2_copygc_thread+0x7f7/0xfa0 fs/bcachefs/movinggc.c:381
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
</TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
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