linux-kernel - Re: [syzbot] [net?] WARNING in print_bfs

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Message-ID: <0000000000009046e805fa828f56@google.com>
Date:   Sat, 29 Apr 2023 17:12:24 -0700
From:   syzbot <syzbot+630f83b42d801d922b8b@...kaller.appspotmail.com>
To:     hdanton@...a.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] WARNING in print_bfs_bug (2)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in print_bfs_bug

------------[ cut here ]------------
lockdep bfs error:-1
WARNING: CPU: 0 PID: 13238 at kernel/locking/lockdep.c:2077 print_bfs_bug+0x22/0x30 kernel/locking/lockdep.c:2077
Modules linked in:
CPU: 0 PID: 13238 Comm: syz-executor.0 Not tainted 6.3.0-syzkaller-07921-g042334a8d424-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
RIP: 0010:print_bfs_bug+0x22/0x30 kernel/locking/lockdep.c:2077
Code: 84 00 00 00 00 00 66 90 55 89 fd 53 e8 b7 34 a9 02 89 c3 e8 60 fd ff ff 85 db 74 10 89 ee 48 c7 c7 20 68 4c 8a e8 0e bb e7 ff <0f> 0b 5b 5d c3 66 0f 1f 84 00 00 00 00 00 53 31 c9 31 d2 31 f6 48
RSP: 0018:ffffc9000348efd8 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff888028e08000 RSI: ffffffff814bef47 RDI: 0000000000000001
RBP: 00000000ffffffff R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888028e08b40
R13: 0000000000000000 R14: ffffc9000348f100 R15: 0000000000000000
FS:  00007f198cdc8700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f198c1a8000 CR3: 000000004534e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 check_irq_usage+0x56c/0x1a40 kernel/locking/lockdep.c:2845
 check_prev_add kernel/locking/lockdep.c:3112 [inline]
 check_prevs_add kernel/locking/lockdep.c:3227 [inline]
 validate_chain kernel/locking/lockdep.c:3842 [inline]
 __lock_acquire+0x2f39/0x5df0 kernel/locking/lockdep.c:5074
 lock_acquire kernel/locking/lockdep.c:5691 [inline]
 lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5656
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 alloc_object lib/debugobjects.c:233 [inline]
 lookup_object_or_alloc.part.0+0x392/0xa30 lib/debugobjects.c:578
 lookup_object_or_alloc lib/debugobjects.c:558 [inline]
 debug_object_activate+0x1ca/0x3f0 lib/debugobjects.c:692
 debug_rcu_head_queue kernel/rcu/rcu.h:226 [inline]
 __call_rcu_common.constprop.0+0x2c/0x7e0 kernel/rcu/tree.c:2612
 dentry_free+0xc3/0x160 fs/dcache.c:377
 __dentry_kill+0x4cb/0x640 fs/dcache.c:621
 shrink_dentry_list+0x12c/0x4f0 fs/dcache.c:1201
 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282
 super_cache_scan+0x33a/0x590 fs/super.c:104
 do_shrink_slab+0x428/0xaa0 mm/vmscan.c:853
 shrink_slab_memcg mm/vmscan.c:922 [inline]
 shrink_slab+0x388/0x660 mm/vmscan.c:1001
 shrink_node_memcgs mm/vmscan.c:6439 [inline]
 shrink_node+0x7fb/0x35f0 mm/vmscan.c:6473
 shrink_zones mm/vmscan.c:6711 [inline]
 do_try_to_free_pages+0x3b4/0x17b0 mm/vmscan.c:6773
 try_to_free_mem_cgroup_pages+0x368/0x840 mm/vmscan.c:7088
 reclaim_high.constprop.0+0x182/0x230 mm/memcontrol.c:2403
 mem_cgroup_handle_over_high+0x190/0x520 mm/memcontrol.c:2588
 resume_user_mode_work include/linux/resume_user_mode.h:58 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x14c/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f198c08c169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f198cdc8168 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: 0000000000000005 RBX: 00007f198c1abf80 RCX: 00007f198c08c169
RDX: 0000000000000010 RSI: 0000000000000003 RDI: 0000000000000010
RBP: 00007f198c0e7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdb5d8bedf R14: 00007f198cdc8300 R15: 0000000000022000
 </TASK>


Tested on:

commit:         042334a8 atlantic:hw_atl2:hw_atl2_utils_fw: Remove unn..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git
console output: https://syzkaller.appspot.com/x/log.txt?x=130c556fc80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7205cdba522fe4bc
dashboard link: https://syzkaller.appspot.com/bug?extid=630f83b42d801d922b8b
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
patch:          https://syzkaller.appspot.com/x/patch.diff?x=13398e2c280000