Public bug reported: Using Ubuntu 16.04 LTS with 4.4.0 kernel on x86_64 After kernel update from 4.4.0-116 to 4.4.0-119 running an eBPF tool to log slow ext4 I/O (bcc-tool ext4slower) causes a kernel panic in bpf_map_update_elem.
Steps to reproduce: * install bcc-tools 0.5.0-1 (https://github.com/iovisor/bcc), packages: bcc-tools, libbcc, python-bcc, libbcc-examples; from repo.iovisor.org * install kernel 4.4.0-119 (linux-image-4.4.0-119-generic linux-image-extra-4.4.0-119 linux-headers-4.4.0-119 linux-headers-4.4.0-119-generic) * reboot * run ext4slower (sudo /usr/share/bcc/tools/ext4slower) * system crashes With kernel 4.4.0-116 ext4slower runs fine. uname -a: Linux <hostname> 4.4.0-119-generic #143-Ubuntu SMP Mon Apr 2 16:08:24 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux BCC tools version: 0.5.0-1 Log of the kernel panic including backtrace: [ 59.635900] BUG: unable to handle kernel paging request at 00000000b98aa6a8 [ 59.642345] IP: [<ffffffff8117cd96>] bpf_map_update_elem+0x6/0x20 [ 59.645782] PGD 0 [ 59.647150] Oops: 0000 [#1] SMP [ 59.649808] Modules linked in: crct10dif_pclmul crc32_pclmul ghash_clmulni_intel ppdev aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd input_leds joydev serio_raw i2c_piix4 8250_fintek parport_pc parport mac_hid autofs4 hid_generic usbhid hid ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops psmouse drm pata_acpi floppy [ 59.672373] CPU: 0 PID: 1 Comm: systemd Not tainted 4.4.0-119-generic #143-Ubuntu [ 59.676407] Hardware name: OpenStack Foundation OpenStack Nova, BIOS 1.10.2-2 04/01/2014 [ 59.680079] task: ffff88013a490000 ti: ffff88013a48c000 task.ti: ffff88013a48c000 [ 59.684124] RIP: 0010:[<ffffffff8117cd96>] [<ffffffff8117cd96>] bpf_map_update_elem+0x6/0x20 [ 59.689097] RSP: 0018:ffff88013a48f980 EFLAGS: 00010086 [ 59.691618] RAX: ffffffff8117cd90 RBX: ffffc90000818170 RCX: 0000000000000000 [ 59.695739] RDX: ffff88013a48fbd0 RSI: ffff88013a48fbe8 RDI: 00000000b98aa680 [ 59.699444] RBP: ffff88013a48fc08 R08: ffff880138d6b180 R09: 0000000000000800 [ 59.703264] R10: ffff88013a490000 R11: 0000000000000246 R12: 0000000000000000 [ 59.707164] R13: ffff8800ba0f4400 R14: ffff88013fc10020 R15: ffff88013a48fd58 [ 59.711112] FS: 00007f4039da58c0(0000) GS:ffff88013fc00000(0000) knlGS:0000000000000000 [ 59.715861] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 59.719025] CR2: 00000000b98aa6a8 CR3: 00000000bb65e000 CR4: 0000000000160670 [ 59.722937] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 59.727210] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 59.731074] Stack: [ 59.732149] ffff88013a48fc08 ffffffff81177411 ffff88013fc20500 0000000000000000 [ 59.735760] 00000000b98aa680 ffff88013a48fbe8 ffff88013a48fbd0 0000000000000000 [ 59.740058] ffff880138d6b180 ffff88013a48fe58 ffff8800bb5ab000 0000000000000000 [ 59.744100] Call Trace: [ 59.745434] [<ffffffff81177411>] ? __bpf_prog_run+0x7a1/0x1360 [ 59.748289] [<ffffffff810b7939>] ? update_curr+0x79/0x170 [ 59.751044] [<ffffffff814e1566>] ? vp_notify+0x16/0x20 [ 59.753601] [<ffffffff810b9a8b>] ? dequeue_entity+0x41b/0xa80 [ 59.756354] [<ffffffff810bcb59>] ? update_load_avg+0x219/0x7d0 [ 59.759171] [<ffffffff810bd1ac>] ? set_next_entity+0x9c/0xb0 [ 59.761890] [<ffffffff8102d66c>] ? __switch_to+0x1dc/0x5c0 [ 59.764667] [<ffffffff8184b081>] ? __schedule+0x341/0x7f0 [ 59.767155] [<ffffffff813dd708>] ? blk_mq_flush_plug_list+0x128/0x150 [ 59.770253] [<ffffffff8184bd60>] ? bit_wait+0x60/0x60 [ 59.772782] [<ffffffff8116c4c7>] trace_call_bpf+0x37/0x50 [ 59.775336] [<ffffffff8116ca57>] kprobe_perf_func+0x37/0x250 [ 59.778264] [<ffffffff810f8e2e>] ? ktime_get+0x3e/0xb0 [ 59.780724] [<ffffffff81142dd6>] ? delayacct_end+0x56/0x60 [ 59.783589] [<ffffffff8116e271>] kprobe_dispatcher+0x31/0x50 [ 59.786490] [<ffffffff811313d5>] aggr_pre_handler+0x45/0x80 [ 59.789534] [<ffffffff81194ae1>] ? generic_file_read_iter+0x1/0x690 [ 59.792407] [<ffffffff81061976>] kprobe_ftrace_handler+0xb6/0x120 [ 59.795329] [<ffffffff81194ae5>] ? generic_file_read_iter+0x5/0x690 [ 59.798453] [<ffffffff81145108>] ftrace_ops_recurs_func+0x58/0xb0 [ 59.801948] [<ffffffffc00180d5>] 0xffffffffc00180d5 [ 59.804357] [<ffffffff81194ae0>] ? filemap_write_and_wait_range+0x70/0x70 [ 59.808022] [<ffffffff81194ae1>] ? generic_file_read_iter+0x1/0x690 [ 59.811225] [<ffffffff81194ae5>] generic_file_read_iter+0x5/0x690 [ 59.814332] [<ffffffff81213eee>] new_sync_read+0x9e/0xe0 [ 59.817079] [<ffffffff81194ae5>] ? generic_file_read_iter+0x5/0x690 [ 59.820120] [<ffffffff8105fc79>] ? kretprobe_trampoline_holder+0x9/0x9 [ 59.825007] [<ffffffff81213f59>] __vfs_read+0x29/0x40 [ 59.827528] [<ffffffff81214526>] vfs_read+0x86/0x130 [ 59.829931] [<ffffffff81215275>] SyS_read+0x55/0xc0 [ 59.832277] [<ffffffff8184f708>] entry_SYSCALL_64_fastpath+0x1c/0xbb [ 59.835220] Code: f0 ff 0f 1f 00 0f 1f 44 00 00 55 48 8b 47 28 48 89 e5 48 8b 40 18 e8 8a 83 6d 00 5d c3 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 <48> 8b 47 28 48 89 e5 48 8b 40 20 e8 6a 83 6d 00 48 98 5d c3 66 [ 59.848944] RIP [<ffffffff8117cd96>] bpf_map_update_elem+0x6/0x20 [ 59.851995] RSP <ffff88013a48f980> [ 59.853771] CR2: 00000000b98aa6a8 [ 59.855364] ---[ end trace a90b99e65b1f34d9 ]--- [ 59.867439] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 [ 59.867439] [ 59.872906] Kernel Offset: disabled [ 59.874834] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 [ 59.874834] ** Affects: ubuntu Importance: Undecided Status: New ** Tags: bot-comment -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763352 Title: kernel panic in bpf_map_update_elem (with bcc tool ext4slower) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1763352/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
