Message-ID: <00000000000084b9dd061599e789@google.com>
Date: Mon, 08 Apr 2024 11:23:38 -0700
From: syzbot <syzbot+27cc650ef45b379dfe5a@...kaller.appspotmail.com>
To: chao@...nel.org, dhavale@...gle.com, huyue2@...lpad.com, 
	jefflexu@...ux.alibaba.com, linux-erofs@...ts.ozlabs.org, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com, xiang@...nel.org
Subject: [syzbot] [erofs?] BUG: using smp_processor_id() in preemptible code
 in z_erofs_get_gbuf

Hello,

syzbot found the following issue on:

HEAD commit:    2b3d5988ae2c Add linux-next specific files for 20240404
git tree:       linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=150f9d29180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9c48fd2523cdee5e
dashboard link: https://syzkaller.appspot.com/bug?extid=27cc650ef45b379dfe5a
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=10a60955180000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10d08115180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/136270ed2c7b/disk-2b3d5988.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/466d2f7c1952/vmlinux-2b3d5988.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7dfaf3959891/bzImage-2b3d5988.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/2026b83172a2/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+27cc650ef45b379dfe5a@...kaller.appspotmail.com

BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u9:1/4483
caller is z_erofs_gbuf_id fs/erofs/zutil.c:31 [inline]
caller is z_erofs_get_gbuf+0x2c/0xd0 fs/erofs/zutil.c:39
CPU: 0 PID: 4483 Comm: kworker/u9:1 Not tainted 6.9.0-rc2-next-20240404-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: erofs_worker z_erofs_decompressqueue_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 check_preemption_disabled+0x10e/0x120 lib/smp_processor_id.c:49
 z_erofs_gbuf_id fs/erofs/zutil.c:31 [inline]
 z_erofs_get_gbuf+0x2c/0xd0 fs/erofs/zutil.c:39
 z_erofs_lz4_handle_overlap fs/erofs/decompressor.c:162 [inline]
 z_erofs_lz4_decompress_mem fs/erofs/decompressor.c:234 [inline]
 z_erofs_lz4_decompress+0xe42/0x17b0 fs/erofs/decompressor.c:307
 z_erofs_decompress_pcluster fs/erofs/zdata.c:1260 [inline]
 z_erofs_decompress_queue+0x1e30/0x3960 fs/erofs/zdata.c:1345
 z_erofs_decompressqueue_work+0x99/0xe0 fs/erofs/zdata.c:1360
 process_one_work kernel/workqueue.c:3218 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3299
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3380


---
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