netdev - Re: [syzbot] [net?] WARNING: locking bug in __task_rq

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Message-ID: <6747fa14.050a0220.253251.0070.GAE@google.com>
Date: Wed, 27 Nov 2024 21:05:24 -0800
From: syzbot <syzbot+bb50a872bcd6dacdf184@...kaller.appspotmail.com>
To: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, 
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] WARNING: locking bug in __task_rq_lock

syzbot has found a reproducer for the following issue on:

HEAD commit:    aaf20f870da0 Merge tag 'rpmsg-v6.13' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=152e71e8580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=493f836b3188006b
dashboard link: https://syzkaller.appspot.com/bug?extid=bb50a872bcd6dacdf184
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=100f7530580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/08102d213bca/disk-aaf20f87.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/80a985df7f54/vmlinux-aaf20f87.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2eccce18d2d9/bzImage-aaf20f87.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/87e2093dad2b/mount_20.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bb50a872bcd6dacdf184@...kaller.appspotmail.com

------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 0 PID: 5975 at kernel/locking/lockdep.c:232 hlock_class kernel/locking/lockdep.c:232 [inline]
WARNING: CPU: 0 PID: 5975 at kernel/locking/lockdep.c:232 check_wait_context kernel/locking/lockdep.c:4850 [inline]
WARNING: CPU: 0 PID: 5975 at kernel/locking/lockdep.c:232 __lock_acquire+0x564/0x2100 kernel/locking/lockdep.c:5176
Modules linked in:
CPU: 0 UID: 0 PID: 5975 Comm: syz-executor Not tainted 6.12.0-syzkaller-10296-gaaf20f870da0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:hlock_class kernel/locking/lockdep.c:232 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4850 [inline]
RIP: 0010:__lock_acquire+0x564/0x2100 kernel/locking/lockdep.c:5176
Code: 00 00 83 3d 41 69 ad 0e 00 75 23 90 48 c7 c7 40 d7 0a 8c 48 c7 c6 40 da 0a 8c e8 77 63 e5 ff 48 ba 00 00 00 00 00 fc ff df 90 <0f> 0b 90 90 90 31 db 48 81 c3 c4 00 00 00 48 89 d8 48 c1 e8 03 0f
RSP: 0018:ffffc90003aef890 EFLAGS: 00010046
RAX: ebff77b2920c0b00 RBX: 00000000000010d8 RCX: ffff888026515a00
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000c10d8 R08: ffffffff815688b2 R09: 1ffff110170c519a
R10: dffffc0000000000 R11: ffffed10170c519b R12: ffff8880265164c4
R13: 0000000000000005 R14: 1ffff11004ca2ca5 R15: ffff888026516528
FS:  000055555f6a9500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2be16756c0 CR3: 0000000032fe0000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
 raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598
 raw_spin_rq_lock kernel/sched/sched.h:1514 [inline]
 __task_rq_lock+0xdf/0x3e0 kernel/sched/core.c:676
 wake_up_new_task+0x513/0xc70 kernel/sched/core.c:4866
 kernel_clone+0x4ee/0x8f0 kernel/fork.c:2818
 __do_sys_clone kernel/fork.c:2930 [inline]
 __se_sys_clone kernel/fork.c:2914 [inline]
 __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2914
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2be0977053
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007fffce1620e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2be0977053
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 000055555f6a97d0 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000003cb79 R14: 000000000003cb07 R15: 00007fffce162270
 </TASK>


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.