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? 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
