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Neels Hofmeyr nhofmeyr at sysmocom.deOn Wed, Dec 14, 2016 at 02:24:23PM +0000, Pravin Kumaravel Manoharan wrote: > I tried to reproduce the issue mentioned in http://lists.osmocom.org/pipermail/openbsc/2016-December/009966.html . > While running sanitizer script I got an error gcc: error: unrecognized command line option '-fsanitize=undefined' > So, to avoid this I removed the option from CFLAGS+= and CXXFLAGS+= . That's odd, all compilers I've used so far apparently support -fsanitize=address -fsanitize=undefined anyway: > Then I got the following error : > ERROR: Address Sanitizer: heap-use-after-free on address 0x60380000a00c at pc 0x436acf bp 0x7ffc4456d4e0 sp 0x7ffc4456d4d8 > but I didn't get any SIGSEGV in sgsn_create_pdp_ctx(). Have you reversed the order of those two lines I wrote about earlier to fix the use-after-free yet? This is what I wrote: > I found a use-after-free which isn't the cause for above asan failure: > > gsm0408_gprs_access_cancelled(mm, GMM_CAUSE_GPRS_NOTALLOWED); > LOGMMCTXP(LOGL_NOTICE, mm, "No PDP context to deactivate\n"); > > gsm0408_gprs_access_cancelled() calls mm_ctx_cleanup_free(), and after that the > local mm is non-NULL but freed. Change the order to: > > LOGMMCTXP(LOGL_NOTICE, mm, "No PDP context to deactivate\n"); > gsm0408_gprs_access_cancelled(mm, GMM_CAUSE_GPRS_NOTALLOWED); > > (This second issue is shown when removing test_pdp_deactivation_with_pdp_ctx() > from test_pdp_deactivation()) If you do that, do you still get any asan errors? I hope that you'll be able to reproduce the segfault, since it was seen on both our build server as well as my own laptop... ~N -- - Neels Hofmeyr <nhofmeyr at sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschäftsführer / Managing Directors: Harald Welte ----- End forwarded message ----- -- - Neels Hofmeyr <nhofmeyr at sysmocom.de> http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschäftsführer / Managing Directors: Harald Welte -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: Digital signature URL: <http://lists.osmocom.org/pipermail/openbsc/attachments/20161215/1fa8dcac/attachment.bin>