On Thu, May 03, 2018 at 10:01:40PM +0300, Julian Anastasov wrote:
> Connections in One-packet scheduling mode (-o, --ops) are
> removed with refcnt=0 because they are not hashed in conn table.
> To avoid refcount_dec reporting this as error, change them to be
> removed with refcount_dec_if_one as all other connections.
>
> refcount_t hit zero at ip_vs_conn_put+0x31/0x40 [ip_vs]
> in sh[15519], uid/euid: 497/497
> WARNING: CPU: 0 PID: 15519 at ../kernel/panic.c:657
> refcount_error_report+0x94/0x9e
> Modules linked in: ip_vs_rr cirrus ttm sb_edac
> edac_core drm_kms_helper crct10dif_pclmul crc32_pclmul
> ghash_clmulni_intel pcbc mousedev drm aesni_intel aes_x86_64
> crypto_simd glue_helper cryptd psmouse evdev input_leds led_class
> intel_agp fb_sys_fops syscopyarea sysfillrect intel_rapl_perf mac_hid
> intel_gtt serio_raw sysimgblt agpgart i2c_piix4 i2c_core ata_generic
> pata_acpi floppy cfg80211 rfkill button loop macvlan ip_vs
> nf_conntrack libcrc32c crc32c_generic ip_tables x_tables ipv6
> crc_ccitt autofs4 ext4 crc16 mbcache jbd2 fscrypto ata_piix libata
> atkbd libps2 scsi_mod crc32c_intel i8042 rtc_cmos serio af_packet
> dm_mod dax fuse xen_netfront xen_blkfront
> CPU: 0 PID: 15519 Comm: sh Tainted: G W
> 4.15.17 #1-NixOS
> Hardware name: Xen HVM domU, BIOS 4.2.amazon 08/24/2006
> RIP: 0010:refcount_error_report+0x94/0x9e
> RSP: 0000:ffffa344dde039c8 EFLAGS: 00010296
> RAX: 0000000000000057 RBX: ffffffff92f20e06 RCX: 0000000000000006
> RDX: 0000000000000007 RSI: 0000000000000086 RDI: ffffa344dde165c0
> RBP: ffffa344dde03b08 R08: 0000000000000218 R09: 0000000000000004
> R10: ffffffff93006a80 R11: 0000000000000001 R12: ffffa344d68cd100
> R13: 00000000000001f1 R14: ffffffff92f12fb0 R15: 0000000000000004
> FS: 00007fc9d2040fc0(0000) GS:ffffa344dde00000(0000)
> knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000000000262a000 CR3: 0000000016a0c004 CR4: 00000000001606f0
> Call Trace:
> <IRQ>
> ex_handler_refcount+0x4e/0x80
> fixup_exception+0x33/0x40
> do_trap+0x83/0x140
> do_error_trap+0x83/0xf0
> ? ip_vs_conn_drop_conntrack+0x120/0x1a5 [ip_vs]
> ? ip_finish_output2+0x29c/0x390
> ? ip_finish_output2+0x1a2/0x390
> invalid_op+0x1b/0x40
> RIP: 0010:ip_vs_conn_put+0x31/0x40 [ip_vs]
> RSP: 0000:ffffa344dde03bb8 EFLAGS: 00010246
> RAX: 0000000000000001 RBX: ffffa344df31cf00 RCX: ffffa344d7450198
> RDX: 0000000000000003 RSI: 00000000fffffe01 RDI: ffffa344d7450140
> RBP: 0000000000000002 R08: 0000000000000476 R09: 0000000000000000
> R10: ffffa344dde03b28 R11: ffffa344df200000 R12: ffffa344d7d09000
> R13: ffffa344def3a980 R14: ffffffffc04f6e20 R15: 0000000000000008
> ip_vs_in.part.29.constprop.36+0x34f/0x640 [ip_vs]
> ? ip_vs_conn_out_get+0xe0/0xe0 [ip_vs]
> ip_vs_remote_request4+0x47/0xa0 [ip_vs]
> ? ip_vs_in.part.29.constprop.36+0x640/0x640 [ip_vs]
> nf_hook_slow+0x43/0xc0
> ip_local_deliver+0xac/0xc0
> ? ip_rcv_finish+0x400/0x400
> ip_rcv+0x26c/0x380
> __netif_receive_skb_core+0x3a0/0xb10
> ? inet_gro_receive+0x23c/0x2b0
> ? netif_receive_skb_internal+0x24/0xb0
> netif_receive_skb_internal+0x24/0xb0
> napi_gro_receive+0xb8/0xe0
> xennet_poll+0x676/0xb40 [xen_netfront]
> net_rx_action+0x139/0x3a0
> __do_softirq+0xde/0x2b4
> irq_exit+0xae/0xb0
> xen_evtchn_do_upcall+0x2c/0x40
> xen_hvm_callback_vector+0x7d/0x90
> </IRQ>
> RIP: 0033:0x7fc9d11c91f9
> RSP: 002b:00007ffebe8a2ea0 EFLAGS: 00000202 ORIG_RAX:
> ffffffffffffff0c
> RAX: 00000000ffffffff RBX: 0000000002609808 RCX: 0000000000000054
> RDX: 0000000000000001 RSI: 0000000002605440 RDI: 00000000025f940e
> RBP: 00000000025f940e R08: 000000000260213d R09: 1999999999999999
> R10: 000000000262a808 R11: 00000000025f942d R12: 00000000025f940e
> R13: 00007fc9d1301e20 R14: 00000000025f9408 R15: 00007fc9d1302720
> Code: 48 8b 95 80 00 00 00 41 55 49 8d 8c 24 e0 05 00
> 00 45 8b 84 24 38 04 00 00 41 89 c1 48 89 de 48 c7 c7 a8 2f f2 92 e8
> 7c fa ff ff <0f> 0b 58 5b 5d 41 5c 41 5d c3 0f 1f 44 00 00 55 48 89 e5
> 41 56
>
> Reported-by: Net Filter <netfilternetfilter@xxxxxxxxx>
> Fixes: b54ab92b84b6 ("netfilter: refcounter conversions")
> Signed-off-by: Julian Anastasov <ja@xxxxxx>
Acked-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
Pablo, can you take this into nf?
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