From: syzbot <syzbot+9b0b6780e063c00f1453@syzkaller.appspotmail.com>
To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org,
daniel@iogearbox.net, eddyz87@gmail.com, haoluo@google.com,
john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org,
linux-kernel@vger.kernel.org, martin.lau@linux.dev,
sdf@google.com, song@kernel.org,
syzkaller-bugs@googlegroups.com, yonghong.song@linux.dev
Subject: [syzbot] [bpf?] KMSAN: uninit-value in htab_map_delete_elem
Date: Sat, 27 Apr 2024 01:34:21 -0700 [thread overview]
Message-ID: <00000000000008ce5306170fe347@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: e88c4cfcb7b8 Merge tag 'for-6.9-rc5-tag' of git://git.kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16672c08980000
kernel config: https://syzkaller.appspot.com/x/.config?x=776c05250f36d55c
dashboard link: https://syzkaller.appspot.com/bug?extid=9b0b6780e063c00f1453
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=11d6807b180000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/76771e00ba79/disk-e88c4cfc.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c957ed943a4f/vmlinux-e88c4cfc.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e719306ed8e3/bzImage-e88c4cfc.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9b0b6780e063c00f1453@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in lookup_elem_raw kernel/bpf/hashtab.c:642 [inline]
BUG: KMSAN: uninit-value in htab_map_delete_elem+0x492/0xaf0 kernel/bpf/hashtab.c:1427
lookup_elem_raw kernel/bpf/hashtab.c:642 [inline]
htab_map_delete_elem+0x492/0xaf0 kernel/bpf/hashtab.c:1427
____bpf_map_delete_elem kernel/bpf/helpers.c:77 [inline]
bpf_map_delete_elem+0x5c/0x80 kernel/bpf/helpers.c:73
___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997
__bpf_prog_run160+0xb5/0xe0 kernel/bpf/core.c:2236
bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
__bpf_prog_run include/linux/filter.h:657 [inline]
bpf_prog_run include/linux/filter.h:664 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
bpf_trace_run4+0x150/0x340 kernel/trace/bpf_trace.c:2422
__bpf_trace_ext4_writepages_result+0x3c/0x50 include/trace/events/ext4.h:542
__traceiter_ext4_writepages_result+0xad/0x160 include/trace/events/ext4.h:542
trace_ext4_writepages_result include/trace/events/ext4.h:542 [inline]
ext4_do_writepages+0x6109/0x62e0 fs/ext4/inode.c:2747
ext4_writepages+0x312/0x830 fs/ext4/inode.c:2768
do_writepages+0x427/0xc30 mm/page-writeback.c:2612
__writeback_single_inode+0x10d/0x12c0 fs/fs-writeback.c:1650
writeback_sb_inodes+0xb48/0x1be0 fs/fs-writeback.c:1941
__writeback_inodes_wb+0x14c/0x440 fs/fs-writeback.c:2012
wb_writeback+0x4da/0xdf0 fs/fs-writeback.c:2119
wb_check_old_data_flush fs/fs-writeback.c:2223 [inline]
wb_do_writeback fs/fs-writeback.c:2276 [inline]
wb_workfn+0x110c/0x1940 fs/fs-writeback.c:2304
process_one_work kernel/workqueue.c:3254 [inline]
process_scheduled_works+0xa81/0x1bd0 kernel/workqueue.c:3335
worker_thread+0xea5/0x1560 kernel/workqueue.c:3416
kthread+0x3e2/0x540 kernel/kthread.c:388
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 stack created at:
__bpf_prog_run160+0x45/0xe0 kernel/bpf/core.c:2236
bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
__bpf_prog_run include/linux/filter.h:657 [inline]
bpf_prog_run include/linux/filter.h:664 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
bpf_trace_run4+0x150/0x340 kernel/trace/bpf_trace.c:2422
CPU: 0 PID: 60 Comm: kworker/u8:5 Not tainted 6.9.0-rc5-syzkaller-00042-ge88c4cfcb7b8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: writeback wb_workfn (flush-8:0)
=====================================================
---
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reply other threads:[~2024-04-27 8:34 UTC|newest]
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