* [syzbot] [net?] WARNING: proc registration bug in atm_dev_register
@ 2025-06-18 19:43 syzbot
2025-06-18 19:47 ` Kuniyuki Iwashima
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2025-06-18 19:43 UTC (permalink / raw)
To: davem, edumazet, horms, kuba, linux-kernel, netdev, pabeni,
syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 52da431bf03b Merge tag 'libnvdimm-fixes-6.16-rc3' of git:/..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=17c7de82580000
kernel config: https://syzkaller.appspot.com/x/.config?x=4130f4d8a06c3e71
dashboard link: https://syzkaller.appspot.com/bug?extid=8bd335d2ad3b93e80715
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=175835d4580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16a7f90c580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/876c709c1090/disk-52da431b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/05dc22ed6dd4/vmlinux-52da431b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/564136f4ae57/bzImage-52da431b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8bd335d2ad3b93e80715@syzkaller.appspotmail.com
------------[ cut here ]------------
proc_dir_entry 'atm/atmtcp:0' already registered
WARNING: CPU: 0 PID: 5919 at fs/proc/generic.c:377 proc_register+0x455/0x5f0 fs/proc/generic.c:377
Modules linked in:
CPU: 0 UID: 0 PID: 5919 Comm: syz-executor284 Not tainted 6.16.0-rc2-syzkaller-00047-g52da431bf03b #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:proc_register+0x455/0x5f0 fs/proc/generic.c:377
Code: 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 a2 01 00 00 48 8b 44 24 10 48 c7 c7 20 c0 c2 8b 48 8b b0 d8 00 00 00 e8 0c 02 1c ff 90 <0f> 0b 90 90 48 c7 c7 80 f2 82 8e e8 0b de 23 09 48 8b 4c 24 28 48
RSP: 0018:ffffc9000466fa30 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817ae248
RDX: ffff888026280000 RSI: ffffffff817ae255 RDI: 0000000000000001
RBP: ffff8880232bed48 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888076ed2140
R13: dffffc0000000000 R14: ffff888078a61340 R15: ffffed100edda444
FS: 00007f38b3b0c6c0(0000) GS:ffff888124753000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f38b3bdf953 CR3: 0000000076d58000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
proc_create_data+0xbe/0x110 fs/proc/generic.c:585
atm_proc_dev_register+0x112/0x1e0 net/atm/proc.c:361
atm_dev_register+0x46d/0x890 net/atm/resources.c:113
atmtcp_create+0x77/0x210 drivers/atm/atmtcp.c:369
atmtcp_attach drivers/atm/atmtcp.c:403 [inline]
atmtcp_ioctl+0x2f9/0xd60 drivers/atm/atmtcp.c:464
do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159
sock_do_ioctl+0x115/0x280 net/socket.c:1190
sock_ioctl+0x227/0x6b0 net/socket.c:1311
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl fs/ioctl.c:893 [inline]
__x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f38b3b74459
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f38b3b0c198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f38b3bfe318 RCX: 00007f38b3b74459
RDX: 0000000000000000 RSI: 0000000000006180 RDI: 0000000000000005
RBP: 00007f38b3bfe310 R08: 65732f636f72702f R09: 65732f636f72702f
R10: 65732f636f72702f R11: 0000000000000246 R12: 00007f38b3bcb0ac
R13: 00007f38b3b0c1a0 R14: 0000200000000200 R15: 00007f38b3bcb03b
</TASK>
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
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.
If you want to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [net?] WARNING: proc registration bug in atm_dev_register
2025-06-18 19:43 [syzbot] [net?] WARNING: proc registration bug in atm_dev_register syzbot
@ 2025-06-18 19:47 ` Kuniyuki Iwashima
2025-06-19 5:26 ` syzbot
0 siblings, 1 reply; 3+ messages in thread
From: Kuniyuki Iwashima @ 2025-06-18 19:47 UTC (permalink / raw)
To: syzbot+8bd335d2ad3b93e80715
Cc: davem, edumazet, horms, kuba, linux-kernel, netdev, pabeni,
syzkaller-bugs, kuniyu
From: syzbot <syzbot+8bd335d2ad3b93e80715@syzkaller.appspotmail.com>
Date: Wed, 18 Jun 2025 12:43:26 -0700
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 52da431bf03b Merge tag 'libnvdimm-fixes-6.16-rc3' of git:/..
> git tree: upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=17c7de82580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=4130f4d8a06c3e71
> dashboard link: https://syzkaller.appspot.com/bug?extid=8bd335d2ad3b93e80715
> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=175835d4580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16a7f90c580000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/876c709c1090/disk-52da431b.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/05dc22ed6dd4/vmlinux-52da431b.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/564136f4ae57/bzImage-52da431b.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+8bd335d2ad3b93e80715@syzkaller.appspotmail.com
>
> ------------[ cut here ]------------
> proc_dir_entry 'atm/atmtcp:0' already registered
> WARNING: CPU: 0 PID: 5919 at fs/proc/generic.c:377 proc_register+0x455/0x5f0 fs/proc/generic.c:377
> Modules linked in:
> CPU: 0 UID: 0 PID: 5919 Comm: syz-executor284 Not tainted 6.16.0-rc2-syzkaller-00047-g52da431bf03b #0 PREEMPT(full)
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
> RIP: 0010:proc_register+0x455/0x5f0 fs/proc/generic.c:377
> Code: 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 a2 01 00 00 48 8b 44 24 10 48 c7 c7 20 c0 c2 8b 48 8b b0 d8 00 00 00 e8 0c 02 1c ff 90 <0f> 0b 90 90 48 c7 c7 80 f2 82 8e e8 0b de 23 09 48 8b 4c 24 28 48
> RSP: 0018:ffffc9000466fa30 EFLAGS: 00010282
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817ae248
> RDX: ffff888026280000 RSI: ffffffff817ae255 RDI: 0000000000000001
> RBP: ffff8880232bed48 R08: 0000000000000001 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000001 R12: ffff888076ed2140
> R13: dffffc0000000000 R14: ffff888078a61340 R15: ffffed100edda444
> FS: 00007f38b3b0c6c0(0000) GS:ffff888124753000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f38b3bdf953 CR3: 0000000076d58000 CR4: 00000000003526f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <TASK>
> proc_create_data+0xbe/0x110 fs/proc/generic.c:585
> atm_proc_dev_register+0x112/0x1e0 net/atm/proc.c:361
> atm_dev_register+0x46d/0x890 net/atm/resources.c:113
> atmtcp_create+0x77/0x210 drivers/atm/atmtcp.c:369
> atmtcp_attach drivers/atm/atmtcp.c:403 [inline]
> atmtcp_ioctl+0x2f9/0xd60 drivers/atm/atmtcp.c:464
> do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159
> sock_do_ioctl+0x115/0x280 net/socket.c:1190
> sock_ioctl+0x227/0x6b0 net/socket.c:1311
> vfs_ioctl fs/ioctl.c:51 [inline]
> __do_sys_ioctl fs/ioctl.c:907 [inline]
> __se_sys_ioctl fs/ioctl.c:893 [inline]
> __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893
> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f38b3b74459
> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 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 b0 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f38b3b0c198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00007f38b3bfe318 RCX: 00007f38b3b74459
> RDX: 0000000000000000 RSI: 0000000000006180 RDI: 0000000000000005
> RBP: 00007f38b3bfe310 R08: 65732f636f72702f R09: 65732f636f72702f
> R10: 65732f636f72702f R11: 0000000000000246 R12: 00007f38b3bcb0ac
> R13: 00007f38b3b0c1a0 R14: 0000200000000200 R15: 00007f38b3bcb03b
> </TASK>
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> 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.
>
#syz test
diff --git a/net/atm/resources.c b/net/atm/resources.c
index 995d29e7fb13..b19d851e1f44 100644
--- a/net/atm/resources.c
+++ b/net/atm/resources.c
@@ -146,11 +146,10 @@ void atm_dev_deregister(struct atm_dev *dev)
*/
mutex_lock(&atm_dev_mutex);
list_del(&dev->dev_list);
- mutex_unlock(&atm_dev_mutex);
-
atm_dev_release_vccs(dev);
atm_unregister_sysfs(dev);
atm_proc_dev_deregister(dev);
+ mutex_unlock(&atm_dev_mutex);
atm_dev_put(dev);
}
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [syzbot] [net?] WARNING: proc registration bug in atm_dev_register
2025-06-18 19:47 ` Kuniyuki Iwashima
@ 2025-06-19 5:26 ` syzbot
0 siblings, 0 replies; 3+ messages in thread
From: syzbot @ 2025-06-19 5:26 UTC (permalink / raw)
To: davem, edumazet, horms, kuba, kuni1840, kuniyu, linux-kernel,
netdev, pabeni, syzkaller-bugs
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-by: syzbot+8bd335d2ad3b93e80715@syzkaller.appspotmail.com
Tested-by: syzbot+8bd335d2ad3b93e80715@syzkaller.appspotmail.com
Tested on:
commit: fb4d33ab Merge tag '6.16-rc2-ksmbd-server-fixes' of gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1223e370580000
kernel config: https://syzkaller.appspot.com/x/.config?x=4130f4d8a06c3e71
dashboard link: https://syzkaller.appspot.com/bug?extid=8bd335d2ad3b93e80715
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=148d3e82580000
Note: testing is done by a robot and is best-effort only.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2025-06-19 5:26 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2025-06-18 19:43 [syzbot] [net?] WARNING: proc registration bug in atm_dev_register syzbot
2025-06-18 19:47 ` Kuniyuki Iwashima
2025-06-19 5:26 ` syzbot
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