From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl1-x62c.google.com ([2607:f8b0:4864:20::62c]) by casper.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lH8pI-00HY3M-ME for linux-um@lists.infradead.org; Tue, 02 Mar 2021 17:28:55 +0000 Received: by mail-pl1-x62c.google.com with SMTP id d11so12411794plo.8 for ; Tue, 02 Mar 2021 09:28:49 -0800 (PST) Message-ID: <5e068447e2067fff8b21c0689f14d080b984f6e0.camel@debian.org> Subject: Re: linux uml segfault From: Ritesh Raj Sarraf Date: Tue, 02 Mar 2021 22:57:40 +0530 In-Reply-To: <5ee28b97-6111-e12c-d0e9-83a13f2151ce@kot-begemot.co.uk> References: <3448a70e7a39b9c3202aeefa7858ace265b8a978.camel@debian.org> <6d37b5aa-36f2-1fce-b70b-8faa0ff882e0@kot-begemot.co.uk>

<529cd4e2f39efffb18125dffab3058aeec3351ce.camel@debian.org> <573e256a-990b-ddf6-7965-367bb8b21229@kot-begemot.co.uk> <1bdedf3c60058e1ae242a2a7f16eee256b0be3e0.camel@debian.org> <6370b92a-84fa-aa21-4270-fcaf1bf42407@kot-begemot.co.uk> <02e348bbb13f0fac92f2147309fb1c006b4583b2.camel@debian.org> <5ee28b97-6111-e12c-d0e9-83a13f2151ce@kot-begemot.co.uk> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: rrs@debian.org Content-Type: multipart/mixed; boundary="===============8889690047814147273==" Sender: "linux-um" Errors-To: linux-um-bounces+geert=linux-m68k.org@lists.infradead.org To: Anton Ivanov , Christopher Obbard , "linux-um@lists.infradead.org" Cc: 983379@bugs.debian.org --===============8889690047814147273== Content-Type: multipart/signed; micalg="pgp-sha512"; protocol="application/pgp-signature"; boundary="=-xeOVGX8nVhEzFtQOM7OF" --=-xeOVGX8nVhEzFtQOM7OF Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2021-03-02 at 17:05 +0000, Anton Ivanov wrote: > > So the best I can extract for you is to compile the kernel with as > > much > > information as possible. >=20 > Can you try using one of the older kernels so we can verify if this > is indeed a 5.10 thing. >=20 That was the first thing I tried. I tested it with 5.10, 5.9 and 5.4. All 3 crashed. That's when I knew this one was going to be painful one to conclude. The only other input I have is that I have one more user who's reported to be able to reproduce the issue. OTOH, I have one more user (other than you) who's not been able to reproduce the issue. > I will do a dissect the moment I figure out how to reproduce it. I > will try to do some more experiments on that tomorrow. Meanwhile, I enabled some debug info in the kernel. Here's what I have got so far: ``` (gdb) bt #0 0x00007f89908dc087 in kill () at ../sysdeps/unix/syscall- template.S:120 #1 0x00000000604a3514 in uml_abort () at arch/um/os-Linux/util.c:94 #2 0x00000000604a3791 in os_dump_core () at arch/um/os- Linux/util.c:149 #3 0x000000006048d126 in panic_exit (self=3D0x2e66d5, unused1=3D6, unused2=3D0x0) at arch/um/kernel/um_arch.c:217 #4 0x00000000604c725a in notifier_call_chain (nl=3D0x2e66d5, val=3D0, v=3D0x60d82f40 , nr_to_call=3D-1, nr_calls=3D0x0) at kernel/notifier.c:83 #5 0x00000000604c72f6 in atomic_notifier_call_chain (nh=3D0x2e66d5, val=3D6, v=3D0x0) at kernel/notifier.c:217 #6 0x0000000060a54607 in panic (fmt=3D0x60a55225 "UH\211\345H\201\354", ) at kernel/panic.c:272 #7 0x000000006048cca3 in segv (fi=3D, ip=3D1615717312, is_user=3D0, regs=3D0x60c2ee58 ) at arch/um/kernel/trap.c:246 #8 0x000000006048ce64 in segv_handler (sig=3D3040981, unused_si=3D0x6, regs=3D0x60c2ee58 ) at arch/um/kernel/trap.c:190 #9 0x00000000604a2556 in sig_handler_common (sig=3D11, si=3D0x60c2fbf0 , mc=3D0x60c2fae8 ) at arch/um/os-Linux/signal.c:48 #10 0x00000000604a2aa2 in sig_handler (sig=3D3040981, si=3D0x6, mc=3D0x0) a= t arch/um/os-Linux/signal.c:81 #11 0x00000000604a265f in hard_handler (sig=3D3040981, si=3D0x60c2fbf0 , p=3D0x0) at arch/um/os-Linux/signal.c:180 #12 #13 0x00000000604de3c0 in printk_caller_id () at kernel/printk/printk.c:1924 #14 log_output (text_len=3D, text=3D, dev_info=3D, lflags=3D, level=3D, facility=3D) at kernel/printk/printk.c:1932 #15 vprintk_store (facility=3D1624806843, level=3D5, dev_info=3D0x0, fmt=3D= 0x35 , args=3D0x1) at kernel/printk/printk.c:2004 #16 0x00000000604de8b7 in vprintk_emit (facility=3D1624806843, level=3D1622768673, dev_info=3D0x35, fmt=3D0x1 , args=3D0x60b97c22) at kernel/printk/printk.c:2029 #17 0x00000000604debad in vprintk_deferred (fmt=3D0x1 , args=3D0x60b97c21) at kernel/printk/printk.c:3079 #18 0x0000000060a554de in printk_deferred (fmt=3D0x60d895bb "\n") at kernel/printk/printk.c:3091 #19 0x000000006092680f in _warn_unseeded_randomness (previous=3D, caller=3D, func_name=3D) at drivers/char/random.c:1534 #20 _warn_unseeded_randomness (func_name=3D0x60abf380 <__func__.38> "get_random_u32", caller=3D0x608b5f25 , previous=3D0x35) at drivers/char/random.c:1516 #21 0x0000000060927d47 in get_random_u32 () at drivers/char/random.c:2221 #22 0x00000000608b5f25 in bucket_table_alloc (nbuckets=3D64, gfp=3D3264, ht=3D) at lib/rhashtable.c:203 #23 0x00000000608b6733 in rhashtable_init (ht=3D0x60c60e30 , params=3D0x608b5e06 ) at lib/rhashtable.c:1061 #24 0x000000006080f234 in ipc_init_ids (ids=3D0x60c60de8 ) at ipc/util.c:119 #25 0x0000000060813c6d in sem_init_ns (ns=3D0x60d895bb ) at ipc/sem.c:254 #26 0x0000000060015b5d in sem_init () at ipc/sem.c:268 #27 0x00007f89906d92f7 in ?? () from /lib/x86_64-linux- gnu/libcom_err.so.2 #28 0x00007f8990ab8fb2 in call_init (l=3D, argc=3Dargc@entry=3D5, argv=3Dargv@entry=3D0x7ffe3e7a4c98, env=3Denv@entry=3D0x7ffe3e7a4cc8) at dl-init.c:72 #29 0x00007f8990ab90b9 in call_init (env=3D0x7ffe3e7a4cc8, argv=3D0x7ffe3e7a4c98, argc=3D5, l=3D) at dl-init.c:30 #30 _dl_init (main_map=3D0x61497ea0, argc=3D5, argv=3D0x7ffe3e7a4c98, env=3D0x7ffe3e7a4cc8) at dl-init.c:119 #31 0x00007f89909d82bd in __GI__dl_catch_exception (exception=3Dexception@entry=3D0x0, operate=3Doperate@entry=3D0x7f8990abc5a= 0 , args=3Dargs@entry=3D0x7ffe3e7a1e80) at dl-error- skeleton.c:182 #32 0x00007f8990abd028 in dl_open_worker (a=3Da@entry=3D0x7ffe3e7a2020) at dl-open.c:758 #33 0x00007f89909d8260 in __GI__dl_catch_exception (exception=3Dexception@entry=3D0x7ffe3e7a2000, operate=3Doperate@entry=3D0x7f8990abcc70 , args=3Dargs@entry=3D0x7ffe3e7a2020) at dl-error-skeleton.c:208 #34 0x00007f8990abc8ca in _dl_open (file=3D0x7ffe3e7a22a0 "libnss_nis.so.2", mode=3D-2147483646, caller_dlopen=3D0x7f89909bf3a6 , nsid=3D-2, argc=3D5, argv=3D0x7ffe3e7a2000, env=3D0x7ffe3e7a4cc8) at dl-open.c:837 #35 0x00007f89909d76dd in do_dlopen (ptr=3Dptr@entry=3D0x7ffe3e7a2260) at dl-libc.c:96 #36 0x00007f89909d8260 in __GI__dl_catch_exception (exception=3Dexception@entry=3D0x7ffe3e7a21e0, operate=3Doperate@entry=3D0x7f89909d76a0 , args=3Dargs@entry=3D0x7ffe3e7a2260) at dl-error-skeleton.c:208 #37 0x00007f89909d831f in __GI__dl_catch_error (objname=3Dobjname@entry=3D0x7ffe3e7a2238, errstring=3Derrstring@entry=3D0x7ffe3e7a2240, mallocedp=3Dmallocedp@entry=3D0x7ffe3e7a2237,=20 operate=3Doperate@entry=3D0x7f89909d76a0 , args=3Dargs@entry=3D0x7ffe3e7a2260) at dl-error-skeleton.c:227 #38 0x00007f89909d77b7 in dlerror_run (operate=3Doperate@entry=3D0x7f89909d76a0 , args=3Dargs@entry=3D0x7ffe3e7a2260) at dl-libc.c:46 #39 0x00007f89909d7846 in __GI___libc_dlopen_mode (name=3Dname@entry=3D0x7ffe3e7a22a0 "libnss_nis.so.2", mode=3Dmode@entry=3D= - 2147483646) at dl-libc.c:195 #40 0x00007f89909bf3a6 in nss_load_library (ni=3Dni@entry=3D0x61497db0) at nsswitch.c:359 #41 0x00007f89909bfc39 in __GI___nss_lookup_function (ni=3D0x61497db0, fct_name=3D, fct_name@entry=3D0x7f899089b020 "setgrent") at nsswitch.c:467 #42 0x00007f899089554b in init_nss_interface () at nss_compat/compat- grp.c:83 #43 init_nss_interface () at nss_compat/compat-grp.c:79 #44 0x00007f8990895e35 in _nss_compat_getgrnam_r (name=3D0x7f8990a2a1e0 "tty", grp=3D0x7ffe3e7a2910, buffer=3D0x7ffe3e7a24e0 "", buflen=3D1024, errnop=3D0x7f899089eb00) at nss_compat/compat-grp.c:486 #45 0x00007f8990968b85 in __getgrnam_r (name=3Dname@entry=3D0x7f8990a2a1e0 "tty", resbuf=3Dresbuf@entry=3D0x7ffe3e7a2910, buffer=3Dbuffer@entry=3D0x7ffe3e7a24e0 "", buflen=3D1024, result=3Dresult@entry=3D0x7ffe3e7a2908) at ../nss/getXXbyYY_r.c:315 #46 0x00007f89909d6b77 in grantpt (fd=3Dfd@entry=3D5) at ../sysdeps/unix/grantpt.c:152 #47 0x00007f8990a9394e in __GI_openpty (amaster=3D0x60c2bd94, aslave=3D0x60c2bd98, name=3D0x0, termp=3D0x0, winp=3D0x0) at openpty.c:103 #48 0x00000000604a1f65 in openpty_cb (arg=3D0x60c2bd94) at arch/um/os- Linux/sigio.c:407 #49 0x00000000604a58d0 in start_idle_thread (stack=3D0x60c28000 , switch_buf=3D0x60c31e08 ) at arch/um/os-Linux/skas/process.c:598 #50 0x0000000060004a3d in start_uml () at arch/um/kernel/skas/process.c:45 #51 0x00000000600047b2 in linux_main (argc=3D1624806843, argv=3D0x40709000) at arch/um/kernel/um_arch.c:334 #52 0x000000006000574f in main (argc=3D5, argv=3D0x7ffe3e7a4c98, envp=3D0x3= 5) at arch/um/os-Linux/main.c:144 (gdb)=20 ``` --=20 Ritesh Raj Sarraf | http://people.debian.org/~rrs Debian - The Universal Operating System --=-xeOVGX8nVhEzFtQOM7OF Content-Type: application/pgp-signature; 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