netdev - WARNING since next-20230516 about ipfrag_low_thresh

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Message-ID: <CADJHv_sDK=0RrMA2FTZQV5fw7UQ+qY=HG21Wu5qb0V9vvx5w6A@mail.gmail.com>
Date: Wed, 17 May 2023 10:53:11 +0800
From: Murphy Zhou <jencce.kernel@...il.com>
To: netdev@...r.kernel.org, Linux-Next <linux-next@...r.kernel.org>, 
	Angus Chen <angus.chen@...uarmicro.com>
Subject: WARNING since next-20230516 about ipfrag_low_thresh_unused

Hi,

This warning keeps hitting the dmesg since the 0516 tree.

Might be this commit:

commit b2cbac9b9b28730e9e53be20b6cdf979d3b9f27e
Author: Angus Chen <angus.chen@...uarmicro.com>
Date:   Fri May 12 09:01:52 2023 +0800

    net: Remove low_thresh in ip defrag

Please help to take a look at.

Thanks,
Murphy




[ 2180.527227] ------------[ cut here ]------------
[ 2180.531902] sysctl net/ipv4/ipfrag_low_thresh: data points to
kernel global data: ipfrag_low_thresh_unused
[ 2180.541649] WARNING: CPU: 7 PID: 681484 at net/sysctl_net.c:155
ensure_safe_net_sysctl+0x88/0x100
[ 2180.550607] Modules linked in: dm_snapshot dm_bufio dm_flakey
binfmt_misc veth tun brd overlay exfat ext2 ext4 mbcache jbd2 cifs tls
loop nfsv3 rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache netfs
rpcrdma rdma_cm iw_cm ib_cm ib_core nfsd auth_rpcgss nfs_acl lockd
grace ipmi_ssif rfkill sunrpc vfat fat intel_rapl_msr
intel_rapl_common edac_mce_amd mgag200 kvm_amd drm_shmem_helper
drm_kms_helper kvm syscopyarea acpi_ipmi sysfillrect ipmi_si irqbypass
sysimgblt ipmi_devintf fb_sys_fops rapl pcspkr i2c_piix4 hpilo k10temp
acpi_tad ipmi_msghandler acpi_power_meter drm fuse xfs libcrc32c
sd_mod t10_pi sg igb ahci libahci crct10dif_pclmul crc32_pclmul
i2c_algo_bit crc32c_intel libata ccp hpwdt ghash_clmulni_intel dca
sp5100_tco wmi dm_mirror dm_region_hash dm_log dm_mod [last unloaded:
scsi_debug]
[ 2180.621100] CPU: 7 PID: 681484 Comm: (ostnamed) Kdump: loaded
Tainted: G        W          6.4.0-rc2-next-20230516 #1
[ 2180.631805] Hardware name: HPE ProLiant DL385 Gen11/ProLiant DL385
Gen11, BIOS 1.10 10/18/2022
[ 2180.640495] RIP: 0010:ensure_safe_net_sysctl+0x88/0x100
[ 2180.645789] Code: 85 bb 72 b9 48 81 fd 00 00 a0 bc 73 b0 48 c7 c1
dd f1 75 ba 4c 8b 43 08 48 8b 13 4c 89 e6 48 c7 c7 c0 51 86 ba e8 f8
b8 4b ff <0f> 0b 66 81 63 14 6d ff eb 89 0f b7 4b 14 4c 8b 4b 08 48 c7
c6 90
[ 2180.664701] RSP: 0018:ff5e70190533bd68 EFLAGS: 00010282
[ 2180.669986] RAX: 0000000000000000 RBX: ff40e6cadd6fea40 RCX: 0000000000000000
[ 2180.677189] RDX: ff40e6ce2cbec880 RSI: ff40e6ce2cbdf840 RDI: ff40e6ce2cbdf840
[ 2180.684399] RBP: ffffffffbc781888 R08: 0000000000000000 R09: 00000000ffff7fff
[ 2180.691609] R10: ff5e70190533bc08 R11: ffffffffbade6888 R12: ffffffffba85c61e
[ 2180.698819] R13: ff40e6cb201dc400 R14: 0000000000000000 R15: 0000000000000000
[ 2180.706029] FS:  00007f519be60b40(0000) GS:ff40e6ce2cbc0000(0000)
knlGS:0000000000000000
[ 2180.714194] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2180.720004] CR2: 00007f519c96efe0 CR3: 000000012878c002 CR4: 0000000000771ee0
[ 2180.727216] PKRU: 55555554
[ 2180.729967] Call Trace:
[ 2180.732462]  <TASK>
[ 2180.734610]  register_net_sysctl+0x20/0x40
[ 2180.738766]  ipv4_frags_init_net+0xdd/0x180
[ 2180.743001]  ops_init+0x33/0xc0
[ 2180.746190]  setup_net+0x12c/0x2c0
[ 2180.749643]  copy_net_ns+0x10a/0x270
[ 2180.753266]  create_new_namespaces+0x113/0x2e0
[ 2180.757767]  unshare_nsproxy_namespaces+0x55/0xb0
[ 2180.762534]  ksys_unshare+0x1a8/0x390
[ 2180.766251]  __x64_sys_unshare+0xe/0x20
[ 2180.770139]  do_syscall_64+0x59/0x90
[ 2180.773764]  ? do_syscall_64+0x69/0x90
[ 2180.777563]  entry_SYSCALL_64_after_hwframe+0x72/0xdc
[ 2180.782672] RIP: 0033:0x7f519c03f90b
[ 2180.786299] Code: 73 01 c3 48 8b 0d 15 a5 1b 00 f7 d8 64 89 01 48
83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 10 01 00
00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e5 a4 1b 00 f7 d8 64 89
01 48
[ 2180.805214] RSP: 002b:00007ffcd1b70ae8 EFLAGS: 00000246 ORIG_RAX:
0000000000000110
[ 2180.812866] RAX: ffffffffffffffda RBX: 0000558b7f0a95e8 RCX: 00007f519c03f90b
[ 2180.820081] RDX: 0000000000000000 RSI: 00007ffcd1b70a50 RDI: 0000000040000000
[ 2180.827287] RBP: 00007ffcd1b70b20 R08: 0000000000000000 R09: 00007ffcd1b70e20
[ 2180.834493] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f519c6c6c52
[ 2180.841700] R13: 00000000fffffff5 R14: 0000000040000000 R15: 0000000000000000
[ 2180.848912]  </TASK>
[ 2180.851142] ---[ end trace 0000000000000000 ]---