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** Package changed: linux-meta-lts-xenial (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Xenial)
Status: New => Incomplete
** Changed in: linux (Ubuntu Xenial)
Importance: Undecided => High
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
** Changed in: linux (Ubuntu Xenial)
Status: Incomplete => Triaged
** Changed in: linux (Ubuntu)
Status: Incomplete => Triaged
** Tags added: kernel-da-key xenial
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https://bugs.launchpad.net/bugs/1763352
Title:
kernel panic in bpf_map_update_elem (with bcc tool ext4slower)
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Xenial:
Triaged
Bug description:
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]
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