From mboxrd@z Thu Jan 1 00:00:00 1970 From: Felipe Balbi Subject: bug on ftrace with v3.17-rc5 Date: Wed, 17 Sep 2014 12:22:11 -0500 Message-ID: <20140917172211.GD8140@saruman.home> Reply-To: Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="C1iGAkRnbeBonpVg" Return-path: Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org To: rostedt@goodmis.org, mingo@redhat.com Cc: Linux Kernel Mailing List , Linux OMAP Mailing List List-Id: linux-omap@vger.kernel.org --C1iGAkRnbeBonpVg Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi, I just triggered a bug with trace by using tail on the trace file: # tail trace [ 2940.039229] Unable to handle kernel paging request at virtual address 81= 4efa9e [ 2940.046904] pgd =3D ec3dc000 [ 2940.049737] [814efa9e] *pgd=3D00000000 [ 2940.053552] Internal error: Oops: 5 [#1] SMP ARM [ 2940.058379] Modules linked in: usb_f_acm u_serial g_serial usb_f_uac2 li= bcomposite configfs xhci_hcd dwc3 udc_core matrix_keypad dwc3_omap lis3lv02= d_i2c lis3lv02d input_polldev [last unloaded: g_audio] [ 2940.077238] CPU: 0 PID: 3020 Comm: tail Tainted: G W 3.17.0-rc5-dirty #1097 [ 2940.085596] task: ed1b1040 ti: ed07c000 task.ti: ed07c000 [ 2940.091258] PC is at strnlen+0x18/0x68 [ 2940.095177] LR is at 0xfffffffe [ 2940.098454] pc : [] lr : [] psr: a0000013 [ 2940.098454] sp : ed07ddb0 ip : ed07ddc0 fp : ed07ddbc [ 2940.110445] r10: c070ff70 r9 : ed07de70 r8 : 00000000 [ 2940.115906] r7 : 814efa9e r6 : ffffffff r5 : ed4b6087 r4 : ed4b50c7 [ 2940.122726] r3 : 00000000 r2 : 814efa9e r1 : ffffffff r0 : 814efa9e [ 2940.129546] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment = user [ 2940.137000] Control: 10c5387d Table: ac3dc059 DAC: 00000015 [ 2940.143006] Process tail (pid: 3020, stack limit =3D 0xed07c248) [ 2940.149098] Stack: (0xed07ddb0 to 0xed07e000) [ 2940.153660] dda0: ed07dde4 ed07ddc0 = c0359628 c0356dec [ 2940.162203] ddc0: 00000000 ed4b50c7 bf03ae9c ed4b6087 bf03ae9e 00000002 = ed07de3c ed07dde8 [ 2940.170740] dde0: c035ab50 c0359600 ffffffff ffffffff ff0a0000 ffffffff = ed07de30 ed4b5088 [ 2940.179275] de00: ed4b50c7 00000fc0 ff0a0004 ffffffff ed4b5088 ed4b5088 = 00000000 00001000 [ 2940.187810] de20: 00001008 00000fc0 ed4b5088 00000000 ed07de68 ed07de40 = c00f1e64 c035a9c4 [ 2940.196341] de40: bf03dae0 ed07de70 ed4b4000 ec25b280 ed4b4000 ec25b280 = bf03dae0 ed07de9c [ 2940.204886] de60: ed07de78 bf033324 c00f1e0c bf03ae9c 814efa9e ed428bc0 = 814eca3e 00000000 [ 2940.213428] de80: 814eba3e ed4b4000 03bd1201 c0c34790 ed07ded4 ed07dea0 = c00edc0c bf0332d0 [ 2940.221994] dea0: 000002c7 ed07df10 ed07decc ed07deb8 ed4b4000 0000209c = ec278ac0 00000000 [ 2940.230536] dec0: 00002000 ec0db340 ed07def4 ed07ded8 c00ee7ec c00eda90 = c00ee7b0 ec278ac0 [ 2940.239075] dee0: ed4b4000 000002d5 ed07df44 ed07def8 c018b8d0 c00ee7bc = c0166d3c ec278af0 [ 2940.247621] df00: 0001f090 ed07df78 000002c7 00000000 000002c8 00000000 = 00000000 ec0db340 [ 2940.256173] df20: 0001f090 ed07df78 ec0db340 00002000 0001f090 00000000 = ed07df74 ed07df48 [ 2940.264729] df40: c0166e98 c018b5f4 00000001 c018535c 000168c1 00000000 = ec0db340 ec0db340 [ 2940.273284] df60: 00002000 0001f090 ed07dfa4 ed07df78 c01675c4 c0166e0c = 000168c1 00000000 [ 2940.281829] df80: 00002000 0000000a 0001f090 00000003 c000f064 ed07c000 = 00000000 ed07dfa8 [ 2940.290365] dfa0: c000ede0 c0167584 00002000 0000000a 00000003 0001f090 = 00002000 00000000 [ 2940.298909] dfc0: 00002000 0000000a 0001f090 00000003 7fffe000 0001e1e0 = 00002004 0000002f [ 2940.307445] dfe0: 00000000 beed38ec 000104c8 b6e6397c 40000010 00000003 = 00000000 00000000 [ 2940.315992] [] (strnlen) from [] (string.isra.8+0x34= /0xe8) [ 2940.323534] [] (string.isra.8) from [] (vsnprintf+0x= 198/0x3fc) [ 2940.331461] [] (vsnprintf) from [] (trace_seq_printf= +0x68/0x94) [ 2940.339494] [] (trace_seq_printf) from [] (ftrace_ra= w_output_dwc3_log_request+0x60/0x78 [dwc3]) [ 2940.350424] [] (ftrace_raw_output_dwc3_log_request [dwc3]) fro= m [] (print_trace_line+0x188/0x418) [ 2940.361507] [] (print_trace_line) from [] (s_show+0x= 3c/0x12c) [ 2940.369330] [] (s_show) from [] (seq_read+0x2e8/0x4a= 0) [ 2940.376519] [] (seq_read) from [] (vfs_read+0x98/0x1= 58) [ 2940.383796] [] (vfs_read) from [] (SyS_read+0x4c/0xa= 0) [ 2940.390981] [] (SyS_read) from [] (ret_fast_syscall+= 0x0/0x48) [ 2940.398792] Code: e24cb004 e3510000 e241e001 0a000011 (e5d01000)=20 [ 2940.406980] ---[ end trace d8b38370fbb531f3 ]--- This is basically v3.17-rc5 with some USB patches I'm testing for v3.18, including a patch where I added tracepoints to dwc3 [1] [1] https://git.kernel.org/cgit/linux/kernel/git/balbi/usb.git/commit/?h=3D= next&id=3D2c4cbe6e5a9c71408b496e00a78ea9284e98af16 --=20 balbi --C1iGAkRnbeBonpVg Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJUGcNDAAoJEIaOsuA1yqREKN8QAInARGkmaf95bBKJUUD6E7Gh 6uVw3O/HGcGlEEm8ouRUUx3SY1susNuX57xnf1RjUXYacV7uVF+sZjbTWwk4TLK/ NtbgvNQ4fFFpEmB7OUfTVds8mlGs6/+NFQ+npec7vL848eXag7IixU7ISzUrk3go yP6j1d1t4mj7YlHA0iDt8ith35DFutuZwMcVRmwwozC5WMAN/6zYb1AC9gNXUKuQ ekLnKE9JO+Q/8MPFquM9mImIrBsFEI8yh6RWJYwD38SxlH109J38ssOJrtH1J1j3 EiwnizuIxp7TAXm6RIPLhjen12wvptLZrezc8LbUt4bj4oRLPjj/qsc+xEvYT5fJ 2b/OHRFCwQo89if/AzucqmHEy2YT9T0igxa+Z+2nuvzHlGktiFMnl+GM28FgRbz5 f0CMsBS6X7sTcE0eUsNVv36fjwnGCVwfDuF3t+qDzuufHXVnBlJUOqnWJLVw6qpN 9ulmI2yEGapDggBhZ3fJ359Z8WvxwSUqqyYSES92qA1ZxNnPRvN4nF2PjVfT0URP sRPEjNSbth5lni27xyzhIGxUCxk+FcXk8cPUXb/ZRVE/KDPLQdoPakWkYr6wjsu3 F6eXx6XyuynEmWmTDiTjppuCJBmBPw2uDPfftTov8tEcQ4n5FRidRwFSrkb0zKqH Z1+cHxexJNL9soBLbpgr =bw/U -----END PGP SIGNATURE----- --C1iGAkRnbeBonpVg--