Re: WARNING: at net/netfilter/core.c:218 __nf_hook_entries_try_shrink+0xf7/0x110

[Florian Westphal]

Mike Galbraith  wrote:
> [   21.219604] ip6_tables: (C) 2000-2006 Netfilter Core Team
> [   21.433091] nf_conntrack version 0.5.0 (65536 buckets, 262144 max)
> [   21.495849] ip_tables: (C) 2000-2006 Netfilter Core Team
> [   22.404040] [ cut here ]
> [   22.404267] WARNING: CPU: 2 PID: 1379 at net/netfilter/core.c:218 
> __nf_hook_entries_try_shrink+0xf7/0x110

The WARN_ON is bogus, I sent a patch to remove it.

> Met 10 of those during this boot.  The first time I booted, the
> warnings were followed by the explosion below, but that kernel was not
> entirely virgin, so add a pinch of salt.
> 
> [   48.592298] Ebtables v2.0 registered
> [   48.730755] BUG: unable to handle kernel NULL pointer dereference at 
> 003c
> [   48.732723] IP: _raw_read_lock_bh+0x15/0x30
> [   48.734526] PGD 0 P4D 0 
> [   48.736482] Oops: 0002 [#1] SMP
> [   48.738317] Dumping ftrace buffer:
> [   48.740260](ftrace buffer empty)
> [   48.775370] RIP: 0010:_raw_read_lock_bh+0x15/0x30
> [   48.776496] RSP: 0018:88041ec83bd0 EFLAGS: 00010286
> [   48.777414] RAX: 0100 RBX: 0001 RCX: 
> 
> [   48.778302] RDX:  RSI: 88041ec83ca8 RDI: 
> 003c
> [   48.779189] RBP:  R08: 0001 R09: 
> 088a0c8d
> [   48.780072] R10:  R11: 7b00 R12: 
> 8803cdcc1300
> [   48.780950] R13: 8803cdcc1300 R14:  R15: 
> 8803f1b8b000
> [   48.781845] FS:  () GS:88041ec8() 
> knlGS:
> [   48.782727] CS:  0010 DS:  ES:  CR0: 80050033
> [   48.783533] CR2: 003c CR3: 0003f19fa001 CR4: 
> 001606e0
> [   48.784348] Call Trace:
> [   48.785160]  
> [   48.786004]  ebt_do_table+0x3b/0x6ca [ebtables]
> [   48.786900]  ? dequeue_rt_stack+0x4c/0x290
> [   48.787792]  ? enqueue_task_rt+0x1da/0x300
> [   48.789001]  nf_hook_slow+0x37/0xb0
> [   48.790662]  br_pass_frame_up+0xbe/0xd0 [bridge]

Haven't seen that before, I will investigate.

WARNING: at net/netfilter/core.c:218 __nf_hook_entries_try_shrink+0xf7/0x110

[Mike Galbraith]

[   21.219604] ip6_tables: (C) 2000-2006 Netfilter Core Team
[   21.433091] nf_conntrack version 0.5.0 (65536 buckets, 262144 max)
[   21.495849] ip_tables: (C) 2000-2006 Netfilter Core Team
[   22.404040] [ cut here ]
[   22.404267] WARNING: CPU: 2 PID: 1379 at net/netfilter/core.c:218 
__nf_hook_entries_try_shrink+0xf7/0x110
[   22.404484] Modules linked in: xt_tcpudp(E) iptable_filter(E) 
ip6table_mangle(E) nf_conntrack_netbios_ns(E) nf_conntrack_broadcast(E) 
nf_conntrack_ipv4(E) nf_defrag_ipv4(E) ip_tables(E) xt_conntrack(E) 
nf_conntrack(E) ip6table_filter(E) ip6_tables(E) x_tables(E) nls_iso8859_1(E) 
nls_cp437(E) intel_rapl(E) x86_pkg_temp_thermal(E) intel_powerclamp(E) 
coretemp(E) snd_hda_codec_hdmi(E) kvm_intel(E) kvm(E) snd_hda_codec_realtek(E) 
snd_hda_codec_generic(E) snd_hda_intel(E) irqbypass(E) joydev(E) 
snd_hda_codec(E) snd_hwdep(E) snd_hda_core(E) snd_pcm(E) crct10dif_pclmul(E) 
snd_timer(E) crc32_pclmul(E) crc32c_intel(E) ghash_clmulni_intel(E) snd(E) 
pcbc(E) aesni_intel(E) iTCO_wdt(E) aes_x86_64(E) r8169(E) 
iTCO_vendor_support(E) crypto_simd(E) glue_helper(E) lpc_ich(E) mii(E) 
mei_me(E) mei(E) mfd_core(E) soundcore(E)
[   22.405405]  cryptd(E) i2c_i801(E) shpchp(E) intel_smartconnect(E) 
thermal(E) fan(E) battery(E) tpm_infineon(E) pcspkr(E) nfsd(E) auth_rpcgss(E) 
nfs_acl(E) lockd(E) grace(E) sunrpc(E) sr_mod(E) cdrom(E) hid_logitech_hidpp(E) 
hid_logitech_dj(E) uas(E) usb_storage(E) hid_generic(E) usbhid(E) nouveau(E) 
wmi(E) i2c_algo_bit(E) drm_kms_helper(E) syscopyarea(E) sysfillrect(E) 
sysimgblt(E) ehci_pci(E) fb_sys_fops(E) ahci(E) xhci_pci(E) ttm(E) libahci(E) 
ehci_hcd(E) xhci_hcd(E) libata(E) drm(E) usbcore(E) video(E) button(E) 
sd_mod(E) vfat(E) fat(E) virtio_rng(E) virtio_blk(E) virtio_mmio(E) 
virtio_pci(E) virtio_ring(E) virtio(E) ext4(E) crc16(E) mbcache(E) jbd2(E) 
fscrypto(E) loop(E) sg(E) dm_multipath(E) dm_mod(E) scsi_dh_rdac(E) 
scsi_dh_emc(E) scsi_dh_alua(E) scsi_mod(E) efivarfs(E) autofs4(E)
[   22.406419] CPU: 2 PID: 1379 Comm: iptables-batch Tainted: GE   
4.13.0.g1c9fe44-master #10
[   22.406662] Hardware name: MEDION MS-7848/MS-7848, BIOS M7848W08.20C 
09/23/2013
[   22.406911] task: 88041e822940 task.stack: c93f4000
[   22.407161] RIP: 0010:__nf_hook_entries_try_shrink+0xf7/0x110
[   22.407411] RSP: 0018:c93f7c18 EFLAGS: 00010246
[   22.407668] RAX: 0010 RBX: 8803cce14e40 RCX: 
[   22.407918] RDX: 0001 RSI:  RDI: 0001
[   22.408162] RBP: c93f7c38 R08: 0001 R09: 
[   22.408410] R10:  R11: 00040001 R12: 8803cce14e58
[   22.408663] R13: 81aac2c8 R14: a09290a0 R15: 81aab9c0
[   22.408928] FS:  7f6c31c1a700() GS:88041ec8() 
knlGS:
[   22.409186] CS:  0010 DS:  ES:  CR0: 80050033
[   22.409447] CR2: 7f708537af14 CR3: 0003fa4e5004 CR4: 001606e0
[   22.409710] Call Trace:
[   22.409978]  nf_unregister_net_hooks+0xf2/0x1a0
[   22.410246]  ? mutex_lock+0xe/0x30
[   22.410518]  ? mutex_lock+0xe/0x30
[   22.410786]  ? cleanup_match+0x40/0x50 [ip_tables]
[   22.411052]  ipv4_hooks_unregister+0x58/0x70 [nf_conntrack_ipv4]
[   22.411322]  nf_ct_netns_put+0x3c/0x80 [nf_conntrack]
[   22.411584]  cleanup_match+0x32/0x50 [ip_tables]
[   22.411845]  cleanup_entry+0x2e/0x90 [ip_tables]
[   22.412110]  translate_table+0x454/0x570 [ip_tables]
[   22.412371]  do_ipt_set_ctl+0xed/0x193 [ip_tables]
[   22.412641]  nf_setsockopt+0x3e/0x60
[   22.412909]  ip_setsockopt+0x6f/0x90
[   22.413178]  SyS_setsockopt+0x5e/0xb0
[   22.413450]  entry_SYSCALL_64_fastpath+0x1a/0xa5
[   22.413706] RIP: 0033:0x7f6c3137cbca
[   22.413969] RSP: 002b:7ffc32d9d558 EFLAGS: 0202 ORIG_RAX: 
0036
[   22.414224] RAX: ffda RBX: 7f6c3162f678 RCX: 7f6c3137cbca
[   22.414490] RDX: 0040 RSI:  RDI: 0007
[   22.414758] RBP: 7f6c3162f620 R08: 0ac8 R09: fefefefeff626d74
[   22.415016] R10: 01ed8920 R11: 0202 R12: 0af0
[   22.415293] R13: 0ac8 R14: 2709 R15: 0ad1
[   22.415564] Code: 39 d1 77 ba 4c 89 f7 e8 98 fe ff ff 4d 89 75 00 48 89 d8 
5b 41 5c 41 5d 41 5e 5d c3 45 31 f6 eb eb 31 c0 eb ee 0f ff 31 c0 eb e8 <0f> ff 
31 c0 0f 1f 44 00 00 eb dd 0f 1f 40 00 66 2e 0f 1f 84 00 
[   22.415881] ---[ end trace d15c01c3a7360856 ]---

Met 10 of those during this boot.  The first time I booted, the
warnings were followed by the explosion below, but that kernel was not
entirely virgin, so add a pinch of salt.

[   48.592298] Ebtables v2.0 registered
[   48.730755] BUG: unable to handle kernel NULL pointer dereference at 
003c
[   48.732723] IP: _raw_read_lock_bh+0x15/0x30
[   48.734526] PGD 0 P4D 0 
[   48.736482] Oops: 0002 [#1] SMP
[   48.738317] Dumping ftrace