On 7/26/19 1:26 AM, Sedat Dilek wrote: > Hi, > > I have opened a new issue in the ClangBuiltLinux issue tracker. Glad to know clang 9 has asm goto support and now It can compile kernel again. > > I am seeing a problem in the area bpf/seccomp causing > systemd/journald/udevd services to fail. > > [Fri Jul 26 08:08:43 2019] systemd[453]: systemd-udevd.service: Failed > to connect stdout to the journal socket, ignoring: Connection refused > > This happens when I use the (LLVM) LLD ld.lld-9 linker but not with > BFD linker ld.bfd on Debian/buster AMD64. > In both cases I use clang-9 (prerelease). Looks like it is a lld bug. I see the stack trace has __bpf_prog_run32() which is used by kernel bpf interpreter. Could you try to enable bpf jit sysctl net.core.bpf_jit_enable = 1 If this passed, it will prove it is interpreter related. > > Base for testing: next-20190723. > > The call-trace looks like this: > > [Fri Jul 26 08:08:42 2019] BUG: unable to handle page fault for > address: ffffffff85403370 > [Fri Jul 26 08:08:42 2019] #PF: supervisor read access in kernel mode > [Fri Jul 26 08:08:42 2019] #PF: error_code(0x0000) - not-present page > [Fri Jul 26 08:08:42 2019] PGD 7620e067 P4D 7620e067 PUD 7620f063 PMD > 44fe85063 PTE 800fffff8a3fc062 > [Fri Jul 26 08:08:42 2019] Oops: 0000 [#1] SMP PTI > [Fri Jul 26 08:08:42 2019] CPU: 2 PID: 417 Comm: (journald) Not > tainted 5.3.0-rc1-5-amd64-cbl-asmgoto #5~buster+dileks1 > [Fri Jul 26 08:08:42 2019] Hardware name: LENOVO > 20HDCTO1WW/20HDCTO1WW, BIOS N1QET83W (1.58 ) 04/18/2019 > [Fri Jul 26 08:08:42 2019] RIP: 0010:___bpf_prog_run+0x40/0x14f0 > [Fri Jul 26 08:08:42 2019] Code: f3 eb 24 48 83 f8 38 0f 84 a9 0c 00 > 00 48 83 f8 39 0f 85 8a 14 00 00 0f 1f 00 48 0f bf 43 02 48 8d 1c c3 > 48 83 c3 08 0f b6 33 <48> 8b 04 f5 10 2e 40 85 48 83 f8 3b 7f 62 48 83 > f8 1e 0f 8f c8 00 > [Fri Jul 26 08:08:42 2019] RSP: 0018:ffff992ec028fcb8 EFLAGS: 00010246 > [Fri Jul 26 08:08:42 2019] RAX: ffff992ec028fd60 RBX: ffff992ec00e9038 > RCX: 0000000000000002 > [Fri Jul 26 08:08:42 2019] RDX: ffff992ec028fd40 RSI: 00000000000000ac > RDI: ffff992ec028fce0 > [Fri Jul 26 08:08:42 2019] RBP: ffff992ec028fcd0 R08: 0000000000000000 > R09: ffff992ec028ff58 > [Fri Jul 26 08:08:42 2019] R10: 0000000000000000 R11: ffffffff849b8210 > R12: 000000007fff0000 > [Fri Jul 26 08:08:42 2019] R13: ffff992ec028feb8 R14: 0000000000000000 > R15: ffff992ec028fce0 > [Fri Jul 26 08:08:42 2019] FS: 00007f5d20f1d940(0000) > GS:ffff8ba3d2500000(0000) knlGS:0000000000000000 > [Fri Jul 26 08:08:42 2019] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [Fri Jul 26 08:08:42 2019] CR2: ffffffff85403370 CR3: 0000000445b3e001 > CR4: 00000000003606e0 > [Fri Jul 26 08:08:42 2019] Call Trace: > [Fri Jul 26 08:08:42 2019] __bpf_prog_run32+0x44/0x70 > [Fri Jul 26 08:08:42 2019] ? flush_tlb_func_common+0xd8/0x230 > [Fri Jul 26 08:08:42 2019] ? mem_cgroup_commit_charge+0x8c/0x120 > [Fri Jul 26 08:08:42 2019] ? wp_page_copy+0x464/0x7a0 > [Fri Jul 26 08:08:42 2019] seccomp_run_filters+0x54/0x110 > [Fri Jul 26 08:08:42 2019] __seccomp_filter+0xf7/0x6e0 > [Fri Jul 26 08:08:42 2019] ? do_wp_page+0x32b/0x5d0 > [Fri Jul 26 08:08:42 2019] ? handle_mm_fault+0x90d/0xbf0 > [Fri Jul 26 08:08:42 2019] syscall_trace_enter+0x182/0x290 > [Fri Jul 26 08:08:42 2019] do_syscall_64+0x30/0x90 > [Fri Jul 26 08:08:42 2019] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > [Fri Jul 26 08:08:42 2019] RIP: 0033:0x7f5d220d7f59 > [Fri Jul 26 08:08:42 2019] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 > 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 > 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 07 6f 0c 00 > f7 d8 64 89 01 48 > [Fri Jul 26 08:08:42 2019] RSP: 002b:00007ffd11332b48 EFLAGS: 00000246 > ORIG_RAX: 000000000000013d > [Fri Jul 26 08:08:42 2019] RAX: ffffffffffffffda RBX: 000055bf8ab34010 > RCX: 00007f5d220d7f59 > [Fri Jul 26 08:08:42 2019] RDX: 000055bf8ab34010 RSI: 0000000000000000 > RDI: 0000000000000001 > [Fri Jul 26 08:08:42 2019] RBP: 000055bf8ab97fb0 R08: 000055bf8abbe180 > R09: 00000000c000003e > [Fri Jul 26 08:08:42 2019] R10: 000055bf8abbe1e0 R11: 0000000000000246 > R12: 00007ffd11332ba0 > [Fri Jul 26 08:08:42 2019] R13: 00007ffd11332b98 R14: 00007f5d21f087f8 > R15: 000000000000002c > [Fri Jul 26 08:08:42 2019] Modules linked in: i2c_dev parport_pc > sunrpc ppdev lp parport efivarfs ip_tables x_tables autofs4 ext4 > crc32c_generic mbcache crc16 jbd2 btrfs zstd_decompress zstd_compress > algif_skcipher af_alg sd_mod dm_crypt dm_mod raid10 raid456 > async_raid6_recov async_memcpy async_pq async_xor async_tx xor > raid6_pq libcrc32c raid1 uas raid0 usb_storage multipath linear > scsi_mod md_mod hid_cherry hid_generic usbhid hid crct10dif_pclmul > crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 > i915 glue_helper crypto_simd nvme i2c_algo_bit cryptd psmouse xhci_pci > drm_kms_helper e1000e i2c_i801 xhci_hcd intel_lpss_pci nvme_core > intel_lpss drm usbcore thermal wmi video button > [Fri Jul 26 08:08:42 2019] CR2: ffffffff85403370 > [Fri Jul 26 08:08:42 2019] ---[ end trace 867b35c7d6c6705a ]--- > [Fri Jul 26 08:08:42 2019] RIP: 0010:___bpf_prog_run+0x40/0x14f0 > [Fri Jul 26 08:08:42 2019] Code: f3 eb 24 48 83 f8 38 0f 84 a9 0c 00 > 00 48 83 f8 39 0f 85 8a 14 00 00 0f 1f 00 48 0f bf 43 02 48 8d 1c c3 > 48 83 c3 08 0f b6 33 <48> 8b 04 f5 10 2e 40 85 48 83 f8 3b 7f 62 48 83 > f8 1e 0f 8f c8 00 > [Fri Jul 26 08:08:42 2019] RSP: 0018:ffff992ec028fcb8 EFLAGS: 00010246 > [Fri Jul 26 08:08:42 2019] RAX: ffff992ec028fd60 RBX: ffff992ec00e9038 > RCX: 0000000000000002 > [Fri Jul 26 08:08:42 2019] RDX: ffff992ec028fd40 RSI: 00000000000000ac > RDI: ffff992ec028fce0 > [Fri Jul 26 08:08:42 2019] RBP: ffff992ec028fcd0 R08: 0000000000000000 > R09: ffff992ec028ff58 > [Fri Jul 26 08:08:42 2019] R10: 0000000000000000 R11: ffffffff849b8210 > R12: 000000007fff0000 > [Fri Jul 26 08:08:42 2019] R13: ffff992ec028feb8 R14: 0000000000000000 > R15: ffff992ec028fce0 > [Fri Jul 26 08:08:42 2019] FS: 00007f5d20f1d940(0000) > GS:ffff8ba3d2500000(0000) knlGS:0000000000000000 > [Fri Jul 26 08:08:42 2019] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [Fri Jul 26 08:08:42 2019] CR2: ffffffff85403370 CR3: 0000000445b3e001 > CR4: 00000000003606e0 > > More details in [1] and what I tried (for example CONFIG_SECCOMP=n) > > I have no clue about BPF or SECCOMP. > > Can you comment on this? > > If this touches BPF: Can you give me some hints and instructions in debugging? > > My kernel-config and dmesg-log are attached. > > Thanks. > > Regards, > - Sedat - > > [1] https://github.com/ClangBuiltLinux/linux/issues/619 >
