----- Original Message ----- > From: "Al Viro" <viro@xxxxxxxxxxxxxxxxxx> > To: "CAI Qian" <caiqian@xxxxxxxxxx> > Cc: "Linus Torvalds" <torvalds@xxxxxxxxxxxxxxxxxxxx>, "Dave Chinner" <david@xxxxxxxxxxxxx>, "linux-xfs" > <linux-xfs@xxxxxxxxxxxxxxx>, "Jens Axboe" <axboe@xxxxxxxxx>, "Nick Piggin" <npiggin@xxxxxxxxx>, > linux-fsdevel@xxxxxxxxxxxxxxx > Sent: Monday, October 3, 2016 4:35:40 PM > Subject: Re: [RFC][CFT] splice_read reworked > > On Mon, Oct 03, 2016 at 04:32:19PM -0400, CAI Qian wrote: > > > It is pretty reproducible so far by just running the trinity from a > > > docker > > > container backed by overlayfs/xfs. > > > > > > # su - test > > > $ trinity > > Also, AFACIT, this is NOT reproducible on v4.8 mainline, but only with this > > splice_read reworked branch of vfs tree. > > I would be very surprised if mainline had somehow managed to trip sanity > checks added in vfs tree ;-) > > Is there any way to record the sequence of syscalls leading to that? > Yes, a bit long shot though. http://people.redhat.com/qcai/tmp/trinity-child113.log This one triggered the warning at lib/iov_iter.c:316 sanity+0x6b/0x6 3 times at once. [ 2200.510753] ------------[ cut here ]------------ [ 2200.515929] WARNING: CPU: 9 PID: 116624 at lib/iov_iter.c:316 sanity+0x6b/0x6f [ 2200.523999] Modules linked in: 8021q garp mrp fuse dlci vmw_vsock_vmci_transport vsock vmw_vmci af_key ieee802154_socket ieee802154 hidp cmtp kernelcapi bnep rfcomm bluetooth rfkill can_bcm can_raw can pptp gre l2tp_ppp l2tp_netlink l2tp_core ip6_udp_tunnel udp_tunnel pppoe pppox ppp_generic slhc nfnetlink scsi_transport_iscsi atm sctp veth ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter xt_conntrack nf_nat nf_conntrack br_netfilter bridge stp llc overlay intel_rapl sb_edac edac_core x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd iTCO_wdt iTCO_vendor_support pcspkr i2c_i801 i2c_smbus mei_me ipmi_ssif sg lpc_ich mei shpchp wmi ipmi_si ipmi_msghandler acpi_power_meter acpi_pad nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs libcrc32c sr_mod sd_mod cdrom mgag200 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops crc32c_intel ttm ixgbe drm ahci mdio libahci ptp libata pps_core i2c_core dca fjes dm_mirror dm_region_hash dm_log dm_mod [ 2200.644251] CPU: 9 PID: 116624 Comm: trinity-c113 Not tainted 4.8.0-rc8-splice+ #1 [ 2200.652708] Hardware name: Intel Corporation S2600WTT/S2600WTT, BIOS GRNDSDP1.86B.0044.R00.1501191641 01/19/2015 [ 2200.664062] 0000000000000286 00000000bad46fa7 ffff8803d1ca7b30 ffffffff813d2eac [ 2200.672368] 0000000000000000 0000000000000000 ffff8803d1ca7b70 ffffffff8109cf11 [ 2200.680660] 0000013c2e32bdc8 ffffea000eea7540 0000000000001000 ffff88030e9a0000 [ 2200.688954] Call Trace: [ 2200.691686] [<ffffffff813d2eac>] dump_stack+0x85/0xc9 [ 2200.697433] [<ffffffff8109cf11>] __warn+0xd1/0xf0 [ 2200.702777] [<ffffffff8109d04d>] warn_slowpath_null+0x1d/0x20 [ 2200.709285] [<ffffffff81418c93>] sanity+0x6b/0x6f [ 2200.714630] [<ffffffff813e9586>] copy_page_to_iter+0xf6/0x1e0 [ 2200.721139] [<ffffffff811e3906>] generic_file_read_iter+0x406/0x800 [ 2200.728231] [<ffffffff810f8afd>] ? down_read_nested+0x4d/0x80 [ 2200.734798] [<ffffffffa02c46ae>] ? xfs_ilock+0x1ae/0x260 [xfs] [ 2200.741433] [<ffffffffa02b3f2f>] xfs_file_buffered_aio_read+0x6f/0x1b0 [xfs] [ 2200.749412] [<ffffffffa02b46e8>] xfs_file_read_iter+0x68/0xc0 [xfs] [ 2200.756504] [<ffffffff812bb359>] generic_file_splice_read+0xb9/0x1b0 [ 2200.763691] [<ffffffff812bb913>] do_splice_to+0x73/0x90 [ 2200.769618] [<ffffffff812bba1b>] splice_direct_to_actor+0xeb/0x220 [ 2200.776610] [<ffffffff812baee0>] ? generic_pipe_buf_nosteal+0x10/0x10 [ 2200.783893] [<ffffffff812bbbd9>] do_splice_direct+0x89/0xd0 [ 2200.790207] [<ffffffff8128261e>] do_sendfile+0x1ce/0x3b0 [ 2200.796231] [<ffffffff812831df>] SyS_sendfile64+0x6f/0xd0 [ 2200.802351] [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0 [ 2200.808471] [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25 [ 2200.815723] ---[ end trace e02dda43787dce2a ]--- [ 2200.821003] ------------[ cut here ]------------ [ 2200.826168] WARNING: CPU: 9 PID: 116624 at lib/iov_iter.c:316 sanity+0x6b/0x6f [ 2200.834765] Modules linked in: 8021q garp mrp fuse dlci vmw_vsock_vmci_transport vsock vmw_vmci af_key ieee802154_socket ieee802154 hidp cmtp kernelcapi bnep rfcomm bluetooth rfkill can_bcm can_raw can pptp gre l2tp_ppp l2tp_netlink l2tp_core ip6_udp_tunnel udp_tunnel pppoe pppox ppp_generic slhc nfnetlink scsi_transport_iscsi atm sctp veth ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter xt_conntrack nf_nat nf_conntrack br_netfilter bridge stp llc overlay intel_rapl sb_edac edac_core x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd iTCO_wdt iTCO_vendor_support pcspkr i2c_i801 i2c_smbus mei_me ipmi_ssif sg lpc_ich mei shpchp wmi ipmi_si ipmi_msghandler acpi_power_meter acpi_pad nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs libcrc32c sr_mod sd_mod cdrom mgag200 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops crc32c_intel ttm ixgbe drm ahci mdio libahci ptp libata pps_core i2c_core dca fjes dm_mirror dm_region_hash dm_log dm_mod [ 2200.951286] CPU: 9 PID: 116624 Comm: trinity-c113 Tainted: G W 4.8.0-rc8-splice+ #1 [ 2200.961088] Hardware name: Intel Corporation S2600WTT/S2600WTT, BIOS GRNDSDP1.86B.0044.R00.1501191641 01/19/2015 [ 2200.972443] 0000000000000286 00000000bad46fa7 ffff8803d1ca7b30 ffffffff813d2eac [ 2200.980747] 0000000000000000 0000000000000000 ffff8803d1ca7b70 ffffffff8109cf11 [ 2200.989078] 0000013c00000000 ffffea000b711880 0000000000001000 ffff88030e9a0000 [ 2200.997375] Call Trace: [ 2201.000107] [<ffffffff813d2eac>] dump_stack+0x85/0xc9 [ 2201.005842] [<ffffffff8109cf11>] __warn+0xd1/0xf0 [ 2201.011199] [<ffffffff8109d04d>] warn_slowpath_null+0x1d/0x20 [ 2201.017708] [<ffffffff81418c93>] sanity+0x6b/0x6f [ 2201.023053] [<ffffffff813e9586>] copy_page_to_iter+0xf6/0x1e0 [ 2201.029562] [<ffffffff811e3906>] generic_file_read_iter+0x406/0x800 [ 2201.036654] [<ffffffff810f8afd>] ? down_read_nested+0x4d/0x80 [ 2201.043213] [<ffffffffa02c46ae>] ? xfs_ilock+0x1ae/0x260 [xfs] [ 2201.049849] [<ffffffffa02b3f2f>] xfs_file_buffered_aio_read+0x6f/0x1b0 [xfs] [ 2201.057828] [<ffffffffa02b46e8>] xfs_file_read_iter+0x68/0xc0 [xfs] [ 2201.064919] [<ffffffff812bb359>] generic_file_splice_read+0xb9/0x1b0 [ 2201.072108] [<ffffffff812bb913>] do_splice_to+0x73/0x90 [ 2201.078034] [<ffffffff812bba1b>] splice_direct_to_actor+0xeb/0x220 [ 2201.085026] [<ffffffff812baee0>] ? generic_pipe_buf_nosteal+0x10/0x10 [ 2201.092309] [<ffffffff812bbbd9>] do_splice_direct+0x89/0xd0 [ 2201.098623] [<ffffffff8128261e>] do_sendfile+0x1ce/0x3b0 [ 2201.104646] [<ffffffff812831df>] SyS_sendfile64+0x6f/0xd0 [ 2201.110768] [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0 [ 2201.116890] [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25 [ 2201.124136] ---[ end trace e02dda43787dce2b ]--- [ 2201.192680] ------------[ cut here ]------------ [ 2201.203826] WARNING: CPU: 9 PID: 116624 at lib/iov_iter.c:316 sanity+0x6b/0x6f [ 2201.211899] Modules linked in: 8021q garp mrp fuse dlci vmw_vsock_vmci_transport vsock vmw_vmci af_key ieee802154_socket ieee802154 hidp cmtp kernelcapi bnep rfcomm bluetooth rfkill can_bcm can_raw can pptp gre l2tp_ppp l2tp_netlink l2tp_core ip6_udp_tunnel udp_tunnel pppoe pppox ppp_generic slhc nfnetlink scsi_transport_iscsi atm sctp veth ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter xt_conntrack nf_nat nf_conntrack br_netfilter bridge stp llc overlay intel_rapl sb_edac edac_core x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd iTCO_wdt iTCO_vendor_support pcspkr i2c_i801 i2c_smbus mei_me ipmi_ssif sg lpc_ich mei shpchp wmi ipmi_si ipmi_msghandler acpi_power_meter acpi_pad nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs libcrc32c sr_mod sd_mod cdrom mgag200 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops crc32c_intel ttm ixgbe drm ahci mdio libahci ptp libata pps_core i2c_core dca fjes dm_mirror dm_region_hash dm_log dm_mod [ 2201.329000] CPU: 9 PID: 116624 Comm: trinity-c113 Tainted: G W 4.8.0-rc8-splice+ #1 [ 2201.338805] Hardware name: Intel Corporation S2600WTT/S2600WTT, BIOS GRNDSDP1.86B.0044.R00.1501191641 01/19/2015 [ 2201.350160] 0000000000000286 00000000bad46fa7 ffff8803d1ca7b30 ffffffff813d2eac [ 2201.358455] 0000000000000000 0000000000000000 ffff8803d1ca7b70 ffffffff8109cf11 [ 2201.366747] 0000013c00000000 ffffea000be93cc0 0000000000001000 ffff88030e9a0000 [ 2201.375035] Call Trace: [ 2201.377767] [<ffffffff813d2eac>] dump_stack+0x85/0xc9 [ 2201.383499] [<ffffffff8109cf11>] __warn+0xd1/0xf0 [ 2201.388843] [<ffffffff8109d04d>] warn_slowpath_null+0x1d/0x20 [ 2201.395351] [<ffffffff81418c93>] sanity+0x6b/0x6f [ 2201.400695] [<ffffffff813e9586>] copy_page_to_iter+0xf6/0x1e0 [ 2201.407204] [<ffffffff811e3906>] generic_file_read_iter+0x406/0x800 [ 2201.414294] [<ffffffff810f8afd>] ? down_read_nested+0x4d/0x80 [ 2201.420844] [<ffffffffa02c46ae>] ? xfs_ilock+0x1ae/0x260 [xfs] [ 2201.427463] [<ffffffffa02b3f2f>] xfs_file_buffered_aio_read+0x6f/0x1b0 [xfs] [ 2201.435451] [<ffffffffa02b46e8>] xfs_file_read_iter+0x68/0xc0 [xfs] [ 2201.442542] [<ffffffff812bb359>] generic_file_splice_read+0xb9/0x1b0 [ 2201.449728] [<ffffffff812bb913>] do_splice_to+0x73/0x90 [ 2201.455655] [<ffffffff812bba1b>] splice_direct_to_actor+0xeb/0x220 [ 2201.462645] [<ffffffff812baee0>] ? generic_pipe_buf_nosteal+0x10/0x10 [ 2201.469928] [<ffffffff812bbbd9>] do_splice_direct+0x89/0xd0 [ 2201.476242] [<ffffffff8128261e>] do_sendfile+0x1ce/0x3b0 [ 2201.482264] [<ffffffff812831df>] SyS_sendfile64+0x6f/0xd0 [ 2201.488383] [<ffffffff81003c9c>] do_syscall_64+0x6c/0x1e0 [ 2201.494504] [<ffffffff817d4a3f>] entry_SYSCALL64_slow_path+0x25/0x25 [ 2201.501736] ---[ end trace e02dda43787dce2c ]--- CAI Qian -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
