linux-kernel - [syzbot] [bpf?] BUG: MAX_STACK_TRACE

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Message-ID: <66f62bf3.050a0220.38ace9.0007.GAE@google.com>
Date: Thu, 26 Sep 2024 20:52:19 -0700
From: syzbot <syzbot+c6c4861455fdd207f160@...kaller.appspotmail.com>
To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, 
	daniel@...earbox.net, eddyz87@...il.com, haoluo@...gle.com, 
	john.fastabend@...il.com, jolsa@...nel.org, kpsingh@...nel.org, 
	linux-kernel@...r.kernel.org, martin.lau@...ux.dev, netdev@...r.kernel.org, 
	sdf@...ichev.me, song@...nel.org, syzkaller-bugs@...glegroups.com, 
	yonghong.song@...ux.dev
Subject: [syzbot] [bpf?] BUG: MAX_STACK_TRACE_ENTRIES too low! (4)

Hello,

syzbot found the following issue on:

HEAD commit:    abf2050f51fd Merge tag 'media/v6.12-1' of git://git.kernel..
git tree:       bpf
console output: https://syzkaller.appspot.com/x/log.txt?x=100fc99f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bc30a30374b0753
dashboard link: https://syzkaller.appspot.com/bug?extid=c6c4861455fdd207f160
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=14ee7107980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/367fc75d0a34/disk-abf2050f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8df13e2678de/vmlinux-abf2050f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/138b13f7dbdb/bzImage-abf2050f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c6c4861455fdd207f160@...kaller.appspotmail.com

BUG: MAX_STACK_TRACE_ENTRIES too low!
turning off the locking correctness validator.
CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.11.0-syzkaller-09959-gabf2050f51fd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 save_trace+0x926/0xb50 kernel/locking/lockdep.c:579
 check_prev_add kernel/locking/lockdep.c:3219 [inline]
 check_prevs_add kernel/locking/lockdep.c:3277 [inline]
 validate_chain+0x2bde/0x5920 kernel/locking/lockdep.c:3901
 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5199
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5822
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 htab_lock_bucket+0x1a4/0x370 kernel/bpf/hashtab.c:167
 htab_map_delete_elem+0x1df/0x6b0 kernel/bpf/hashtab.c:1430
 bpf_prog_bc20a984d57ef3f1+0x67/0x6b
 bpf_dispatcher_nop_func include/linux/bpf.h:1257 [inline]
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run include/linux/filter.h:708 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2318 [inline]
 bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2359
 __traceiter_kfree+0x2b/0x50 include/trace/events/kmem.h:94
 trace_kfree include/trace/events/kmem.h:94 [inline]
 kfree+0x35e/0x440 mm/slub.c:4715
 security_task_free+0xa4/0x1a0 security/security.c:3178
 __put_task_struct+0xf9/0x290 kernel/fork.c:977
 put_task_struct include/linux/sched/task.h:144 [inline]
 delayed_put_task_struct+0x125/0x300 kernel/exit.c:228
 rcu_do_batch kernel/rcu/tree.c:2567 [inline]
 rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823
 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554
 run_ksoftirqd+0xca/0x130 kernel/softirq.c:927
 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

---
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