On Tue, 2019-09-24 at 13:55 -0400, Nick Bowler wrote: > On 9/20/19, Nick Bowler <nbowler@xxxxxxxxxx> wrote: > > On 9/20/19, Trond Myklebust <trondmy@xxxxxxxxxxxxxxx> wrote: > > > On Fri, 2019-09-20 at 14:23 -0400, Nick Bowler wrote: > > > > Not sure how reproducible this is. Since I've never seen a > > > > crash > > > > like this before it may be a regression compared to, say, Linux > > > > 4.19 > > > > but I am not certain because this particular machine is brand > > > > new so > > > > I don't have experience with older kernels on it... > > > > So it actually seems pretty reliably reproducible, 4 attempts to > > compile > > Linux on Linux 5.3 and all four crash the same way, although > > there's > > definitely some randomness here... > > > > On the other hand, I cannot reproduce if I install Linux 5.2 so it > > does > > seem like a regression in 5.3. I will see how well bisecting > > goes... > > Not well I guess? I'm not sure what it's doing but for some reason > git > bisect does not seem to be converging towards any solution. I run > for > several hours before marking 'good' and it only seems to be reducing > the > '# of revisions left to test' by a tiny amount, not the ~half like > I'd expect so bleh... > > Any ideas what could be wrong? Hints on how to reproduce faster? As I said, this is a keyring bug. It has nothing whatsoever to do with NFS, so I have no advice. > > git bisect start > # bad: [4d856f72c10ecb060868ed10ff1b1453943fc6c8] Linux 5.3 > git bisect bad 4d856f72c10ecb060868ed10ff1b1453943fc6c8 > # good: [0ecfebd2b52404ae0c54a878c872bb93363ada36] Linux 5.2 > git bisect good 0ecfebd2b52404ae0c54a878c872bb93363ada36 > # skip: [c236b6dd48dcf2ae6ed14b9068830eccc3e181e6] Merge tag > 'keys-request-20190626' of > git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs > git bisect skip c236b6dd48dcf2ae6ed14b9068830eccc3e181e6 > # skip: [028db3e290f15ac509084c0fc3b9d021f668f877] Revert "Merge tag > 'keys-acl-20190703' of > git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs" > git bisect skip 028db3e290f15ac509084c0fc3b9d021f668f877 > # bad: [002c5f73c508f7df5681bda339831c27f3c1aef4] KVM: x86/mmu: > Reintroduce fast invalidate/zap for flushing memslot > git bisect bad 002c5f73c508f7df5681bda339831c27f3c1aef4 > # bad: [d3464ccd105b42f87302572ee1f097e6e0b432c6] Merge tag > 'dmaengine-fix-5.3' of git://git.infradead.org/users/vkoul/slave-dma > git bisect bad d3464ccd105b42f87302572ee1f097e6e0b432c6 > # bad: [0445971000375859008414f87e7c72fa0d809cf8] Merge tag > 'mmc-v5.3-rc7' of > git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc > git bisect bad 0445971000375859008414f87e7c72fa0d809cf8 > # bad: [046ddeed0461b5d270470c253cbb321103d048b6] KVM: Check > preempted_in_kernel for involuntary preemption > git bisect bad 046ddeed0461b5d270470c253cbb321103d048b6 > # skip: [8f6ccf6159aed1f04c6d179f61f6fb2691261e84] Merge tag > 'clone3-v5.3' of > git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux > git bisect skip 8f6ccf6159aed1f04c6d179f61f6fb2691261e84 > # good: [d84f6269ce24eb4c468e246b24fc0fdce34ab6f6] crypto: ccree - > check that cryptocell reset completed > git bisect good d84f6269ce24eb4c468e246b24fc0fdce34ab6f6 > # good: [5f92229d184b80712a8b94d098318960171ae749] ASoC: mxs: > mxs-sgtl5000: don't select unnecessary Platform > git bisect good 5f92229d184b80712a8b94d098318960171ae749 > # good: [a2928d28643e3c064ff41397281d20c445525032] r8169: use paged > versions of phylib MDIO access functions > git bisect good a2928d28643e3c064ff41397281d20c445525032 > # good: [1b2fc358ddfb1b0915922e441182cda7043f5116] perf tools: Add > missing util.h to pick up 'page_size' variable > git bisect good 1b2fc358ddfb1b0915922e441182cda7043f5116 > # good: [a011b49f4ed7813777a15da12a426ab939c58f14] net/mlx5e: > Consider > XSK in XDP MTU limit calculation > git bisect good a011b49f4ed7813777a15da12a426ab939c58f14 > # good: [89a237aa84c7047cafba99f5dc81983ed0c40704] staging: kpc2000: > Use '%llx' for printing 'long long int' type > git bisect good 89a237aa84c7047cafba99f5dc81983ed0c40704 > # good: [60e8523e2ea18dc0c0cea69d6c1d69a065019062] ocxl: Allow > contexts to be attached with a NULL mm > git bisect good 60e8523e2ea18dc0c0cea69d6c1d69a065019062 > # good: [452181936931f0f08923aba5e04e1e9ef58c389f] afs: Trace > afs_server usage > git bisect good 452181936931f0f08923aba5e04e1e9ef58c389f > # good: [78ff751f8e6a9446e9fb26b2bff0b8d3f8974cbd] scsi: mac_scsi: > Fix > pseudo DMA implementation, take 2 > git bisect good 78ff751f8e6a9446e9fb26b2bff0b8d3f8974cbd > # good: [5315f9d40191f98abcd3164e632a8a8f737b1cf0] rtlwifi: remove > redundant assignment to variable badworden > git bisect good 5315f9d40191f98abcd3164e632a8a8f737b1cf0 > # good: [65dc5416d4e02d80ce140078c7c1f4e6c8400396] Merge tag > 'batadv-next-for-davem-20190627v2' of > git://git.open-mesh.org/linux-merge > git bisect good 65dc5416d4e02d80ce140078c7c1f4e6c8400396 > # skip: [0248a8be6d21dad72b9ce80a7565cf13c11509d8] Merge tag > 'gfs2-for-5.3' of > git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2 > git bisect skip 0248a8be6d21dad72b9ce80a7565cf13c11509d8 > # good: [aa0bfcd939c30617385ffa28682c062d78050eba] mm: add > filemap_fdatawait_range_keep_errors() > git bisect good aa0bfcd939c30617385ffa28682c062d78050eba > # good: [15a98fb2fc287bbfe430e854d56dcfc86eae21db] media: > dvb_frontend: split dvb_frontend_handle_ioctl function > git bisect good 15a98fb2fc287bbfe430e854d56dcfc86eae21db > # good: [d17adf7d3f5be74bdfda89ceed7bff3910ffb6d4] regulator: > max77802: Drop unused includes > git bisect good d17adf7d3f5be74bdfda89ceed7bff3910ffb6d4 > > > > > [ 796.050025] BUG: kernel NULL pointer dereference, address: > > > > 0000000000000014 > > > > [ 796.051280] #PF: supervisor read access in kernel mode > > > > [ 796.053063] #PF: error_code(0x0000) - not-present page > > > > [ 796.054636] PGD 0 P4D 0 > > > > [ 796.055688] Oops: 0000 [#1] PREEMPT SMP > > > > [ 796.056768] CPU: 2 PID: 190 Comm: kworker/2:2 Tainted: > > > > G W > > > > 5.3.0 #6 > > > > [ 796.057953] Hardware name: To Be Filled By O.E.M. To Be > > > > Filled By > > > > O.E.M./B450 Gaming-ITX/ac, BIOS P3.30 05/17/2019 > > > > [ 796.059329] Workqueue: events key_garbage_collector > > > > [ 796.060623] RIP: 0010:keyring_gc_check_iterator+0x27/0x30 > > > > > > That would be the keyring garbage collector, not NFS. > > > > > > Cced keyrings@xxxxxxxxxxxxxxx > > > > > > > > > > [ 796.061845] Code: 44 00 00 48 83 e7 fc b8 01 00 00 00 f6 87 > > > > 80 00 > > > > 00 00 21 75 19 48 8b 57 58 48 39 16 7c 05 48 85 d2 7f 0b 48 8b > > > > 87 a0 > > > > 00 00 00 <0f> b6 40 14 c3 0f 1f 40 00 48 83 e7 fc e9 27 eb ff > > > > ff 0f > > > > 1f > > > > 80 00 > > > > [ 796.064638] RSP: 0018:ffffb40fc0757df8 EFLAGS: 00010282 > > > > [ 796.066058] RAX: 0000000000000000 RBX: ffffa14338caed80 RCX: > > > > ffffb40fc0757e40 > > > > [ 796.067531] RDX: ffffa1433ae85558 RSI: ffffb40fc0757e40 RDI: > > > > ffffa1433ae85500 > > > > [ 796.069014] RBP: ffffb40fc0757e40 R08: 0000000000000000 R09: > > > > 000000000000000f > > > > [ 796.070513] R10: 8080808080808080 R11: 0000000000000001 R12: > > > > ffffffffa4cd6180 > > > > [ 796.072025] R13: ffffa14338caee10 R14: ffffa14338caedf0 R15: > > > > ffffa1433ffeff00 > > > > [ 796.073567] FS: 0000000000000000(0000) > > > > GS:ffffa14340480000(0000) > > > > knlGS:0000000000000000 > > > > [ 796.075171] CS: 0010 DS: 0000 ES: 0000 CR0: > > > > 0000000080050033 > > > > [ 796.076785] CR2: 0000000000000014 CR3: 0000000747ce6000 CR4: > > > > 00000000003406e0 > > > > [ 796.078445] Call Trace: > > > > [ 796.080091] assoc_array_subtree_iterate+0x55/0x100 > > > > [ 796.081770] keyring_gc+0x3f/0x80 > > > > [ 796.083447] key_garbage_collector+0x330/0x3d0 > > > > [ 796.085155] process_one_work+0x1cb/0x320 > > > > [ 796.086869] worker_thread+0x28/0x3c0 > > > > [ 796.088603] ? process_one_work+0x320/0x320 > > > > [ 796.090335] kthread+0x106/0x120 > > > > [ 796.092053] ? kthread_create_on_node+0x40/0x40 > > > > [ 796.093810] ret_from_fork+0x1f/0x30 > > > > [ 796.095569] Modules linked in: sha1_ssse3 sha1_generic cbc > > > > cts > > > > rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace ext4 crc16 > > > > mbcache > > > > jbd2 iwlmvm mac80211 libarc4 amdgpu iwlwifi > > > > snd_hda_codec_realtek > > > > snd_hda_codec_generic kvm_amd gpu_sched kvm snd_hda_codec_hdmi > > > > drm_kms_helper irqbypass k10temp syscopyarea sysfillrect > > > > sysimgblt > > > > fb_sys_fops video ttm cfg80211 snd_hda_intel snd_hda_codec drm > > > > snd_hwdep rfkill snd_hda_core backlight snd_pcm evdev snd_timer > > > > snd > > > > soundcore efivarfs dm_crypt hid_generic igb hwmon i2c_algo_bit > > > > sr_mod > > > > cdrom sunrpc dm_mod > > > > [ 796.104033] CR2: 0000000000000014 > > > > [ 796.106304] ---[ end trace 695aee10f9202347 ]--- > > > > [ 796.108585] RIP: 0010:keyring_gc_check_iterator+0x27/0x30 > > > > [ 796.110894] Code: 44 00 00 48 83 e7 fc b8 01 00 00 00 f6 87 > > > > 80 00 > > > > 00 00 21 75 19 48 8b 57 58 48 39 16 7c 05 48 85 d2 7f 0b 48 8b > > > > 87 a0 > > > > 00 00 00 <0f> b6 40 14 c3 0f 1f 40 00 48 83 e7 fc e9 27 eb ff > > > > ff 0f > > > > 1f > > > > 80 00 > > > > [ 796.115773] RSP: 0018:ffffb40fc0757df8 EFLAGS: 00010282 > > > > [ 796.118209] RAX: 0000000000000000 RBX: ffffa14338caed80 RCX: > > > > ffffb40fc0757e40 > > > > [ 796.120683] RDX: ffffa1433ae85558 RSI: ffffb40fc0757e40 RDI: > > > > ffffa1433ae85500 > > > > [ 796.123176] RBP: ffffb40fc0757e40 R08: 0000000000000000 R09: > > > > 000000000000000f > > > > [ 796.125668] R10: 8080808080808080 R11: 0000000000000001 R12: > > > > ffffffffa4cd6180 > > > > [ 796.128104] R13: ffffa14338caee10 R14: ffffa14338caedf0 R15: > > > > ffffa1433ffeff00 > > > > [ 796.130493] FS: 0000000000000000(0000) > > > > GS:ffffa14340480000(0000) > > > > knlGS:0000000000000000 > > > > [ 796.132923] CS: 0010 DS: 0000 ES: 0000 CR0: > > > > 0000000080050033 > > > > [ 796.135266] CR2: 0000000000000014 CR3: 0000000747ce6000 CR4: > > > > 00000000003406e0 -- Trond Myklebust CTO, Hammerspace Inc 4300 El Camino Real, Suite 105 Los Altos, CA 94022 www.hammer.space
