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Date:   Tue, 13 Nov 2018 19:29:20 +0200
From:   Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To:     Qian Cai <cai@gmx.us>
Cc:     linux-kernel@vger.kernel.org, Petr Mladek <pmladek@suse.com>,
        "Tobin C. Harding" <me@tobin.cc>,
        "Steven Rostedt (VMware)" <rostedt@goodmis.org>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Subject: Re: WARNING: CPU: 26 PID: 64391 at lib/vsprintf.c:2193
 set_precision+0x84/0x90
Message-ID: <20181113172920.GI10650@smile.fi.intel.com>
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On Tue, Nov 13, 2018 at 11:55:32AM -0500, Qian Cai wrote:

+Cc Rasmus

> Running the trinity fuzzer with a non-root user on an aarch64 server with the
> latest mainline (rc2) generated this. Is it just a false alarm to ignore?
> 
> [??807.847370] precision 65525 too large

It seems like someone uses -EAGAIN as a parameter to printf().

Or rather this line

  if (!fs && (request_module("fs-%.*s", len, name) == 0)) {
	  ...
  }

Care to print the len and name parameters before this line?


> [??807.847449] WARNING: CPU: 26 PID: 64391 at lib/vsprintf.c:2193
> set_precision+0x84/0x90
> [??807.860161] Modules linked in: cast6_generic cast_common lrw bridge 8021q
> garp mrp stp llc dlci tcp_diag inet_diag af_key pptp gre l2tp_ppp l2tp_netlink
> l2tp_core ip6_udp_tunnel udp_tunnel pppoe pppox ppp_generic slhc crypto_user
> ib_core nfnetlink scsi_transport_iscsi atm sctp vfat fat ghash_ce sha2_ce
> sha256_arm64 sha1_ce ses enclosure ipmi_ssif sg ipmi_si ipmi_devintf sbsa_gwdt
> ipmi_msghandler sch_fq_codel xfs libcrc32c marvell mpt3sas mlx5_core raid_class
> hibmc_drm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm
> ixgbe hisi_sas_v2_hw igb hisi_sas_main libsas hns_dsaf mlxfw devlink
> hns_enet_drv mdio i2c_designware_platform i2c_algo_bit i2c_designware_core
> ehci_platform scsi_transport_sas hns_mdio hnae dm_mirror dm_region_hash dm_log
> dm_mod
> [??807.927838] CPU: 26 PID: 64391 Comm: trinity-c90 Kdump: loaded Tainted:
> G????????W?????????4.20.0-rc2+ #16
> [??807.937494] Hardware name: Huawei TaiShan 2280 /BC11SPCD, BIOS 1.50
> 06/01/2018
> [??807.944718] pstate: 60000005 (nZCv daif -PAN -UAO)
> [??807.949515] pc : set_precision+0x84/0x90
> [??807.953439] lr : set_precision+0x84/0x90
> [??807.957362] sp : ffff801e6430f6b0
> [??807.960677] x29: ffff801e6430f6b0 x28: ffff801e6430fb10?
> [??807.965992] x27: 0000000000000003 x26: 00000000ffffffd8?
> [??807.971307] x25: ffff801e6430fba0 x24: ffff801e6430fb48?
> [??807.976622] x23: ffff2000093ddfa0 x22: ffff801e6430f770?
> [??807.981937] x21: ffff2000090eb4a6 x20: ffff801e6430f770?
> [??807.987252] x19: 000000000000fff5 x18: 0000000000000000?
> [??807.992569] x17: 0000000000000000 x16: 0000000000000000?
> [??807.997884] x15: 0000000000000000 x14: 3878302031343220?
> [??808.003201] x13: 6265783020303939 x12: ffff04000172b49c?
> [??808.008516] x11: 1fffe4000172b49b x10: ffff04000172b49b?
> [??808.013832] x9 : 0000000000000000 x8 : 203532353536206e?
> [??808.019148] x7 : 6f69736963657270 x6 : 0000000041b58ab3?
> [??808.024463] x5 : dfff200000000000 x4 : dfff200000000000?
> [??808.029779] x3 : dfff200000000000 x2 : 65a2459128144800?
> [??808.035093] x1 : 65a2459128144800 x0 : 0000000000000000?
> [??808.040408] Call trace:
> [??808.042861]??set_precision+0x84/0x90
> [??808.046440]??vsnprintf+0x23c/0x858
> [??808.049845]??__request_module+0x1a0/0x8b8
> [??808.053860]??get_fs_type+0xb0/0x138
> [??808.057351]??do_mount+0x2c4/0x13c0
> [??808.060756]??ksys_mount+0xf4/0x110
> [??808.064160]??__arm64_sys_mount+0x70/0x88
> [??808.068087]??el0_svc_handler+0xd4/0x198
> [??808.071928]??el0_svc+0x8/0xc
> [??808.074810] irq event stamp: 347872
> [??808.078305] hardirqs last??enabled at (347871): [<ffff2000082080e8>]
> vprintk_emit+0x2b0/0x5c0
> [??808.086833] hardirqs last disabled at (347872): [<ffff200008081490>]
> do_debug_exception+0xd8/0x190
> [??808.095795] softirqs last??enabled at (347844): [<ffff200008082210>]
> __do_softirq+0x7c8/0x9c8
> [??808.104325] softirqs last disabled at (347837): [<ffff20000812dbe4>]
> irq_exit+0x25c/0x2f0
> [??808.112502] ---[ end trace 598902d30712b79e ]---

-- 
With Best Regards,
Andy Shevchenko