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Date: Fri, 16 Apr 2021 08:55:57 +0200
From: Jiri Olsa <jolsa@...hat.com>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andriin@...com>,
Network Development <netdev@...r.kernel.org>,
bpf <bpf@...r.kernel.org>, Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...omium.org>,
Toke Høiland-Jørgensen <toke@...hat.com>,
Julia Lawall <julia.lawall@...ia.fr>
Subject: Re: [PATCHv5 bpf-next 0/7] bpf: Tracing and lsm programs re-attach
On Thu, Apr 15, 2021 at 04:45:24PM -0700, Alexei Starovoitov wrote:
> On Wed, Apr 14, 2021 at 12:52 PM Jiri Olsa <jolsa@...nel.org> wrote:
> >
> > hi,
> > while adding test for pinning the module while there's
> > trampoline attach to it, I noticed that we don't allow
> > link detach and following re-attach for trampolines.
> > Adding that for tracing and lsm programs.
> >
> > You need to have patch [1] from bpf tree for test module
> > attach test to pass.
> >
> > v5 changes:
> > - fixed missing hlist_del_init change
> > - fixed several ASSERT calls
> > - added extra patch for missing ';'
> > - added ASSERT macros to lsm test
> > - added acks
>
> It doesn't work:
hi,
I got the same warning when running test without the
patch [1] I mentioned:
861de02e5f3f bpf: Take module reference for trampoline in module
I still don't see it in bpf-next/master
jirka
> [ 52.763254] ------------[ cut here ]------------
> [ 52.763767] WARNING: CPU: 2 PID: 1967 at kernel/bpf/syscall.c:2518
> bpf_tracing_link_release+0x34/0x40
> [ 52.764666] Modules linked in: bpf_preload [last unloaded: bpf_testmod]
> [ 52.765310] CPU: 2 PID: 1967 Comm: test_progs Tainted: G
> O 5.12.0-rc4-01652-gf03a9b92b5f3 #3293
> [ 52.766279] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS 1.11.0-2.el7 04/01/2014
> [ 52.767128] RIP: 0010:bpf_tracing_link_release+0x34/0x40
> [ 52.767653] Code: 8b 77 48 48 8b 7f 18 e8 ea 67 02 00 85 c0 75 1a
> 48 8b 7b 48 e8 ad 60 02 00 48 8b 7b 50 48 85 ff 74 06 5b e9 6e ff ff
> ff 5b c3 <0f> 0b eb e2 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89
> fd 8b
> [ 52.769444] RSP: 0018:ffffc900001bfe98 EFLAGS: 00010286
> [ 52.769957] RAX: 00000000ffffffed RBX: ffff88810218e420 RCX: 0000000000000000
> [ 52.770642] RDX: ffff888105e89f80 RSI: ffffffff8118e539 RDI: ffff88811cafec10
> [ 52.771338] RBP: ffff88810218e420 R08: 0000000000000270 R09: 00000000000003cb
> [ 52.772041] R10: ffff8881002a1090 R11: ffff888237d2aaf0 R12: ffff888101951030
> [ 52.772729] R13: ffff888100226f20 R14: ffff88810629f180 R15: ffff888105e89f80
> [ 52.773419] FS: 00007f82c7b93700(0000) GS:ffff888237d00000(0000)
> knlGS:0000000000000000
> [ 52.774213] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 52.774784] CR2: 00007f82c7ba1000 CR3: 0000000105cfc006 CR4: 00000000003706e0
> [ 52.775494] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 52.776199] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 52.776887] Call Trace:
> [ 52.777143] bpf_link_free+0x25/0x40
> [ 52.777525] bpf_link_release+0x11/0x20
> [ 52.777924] __fput+0x9f/0x240
> [ 52.778234] task_work_run+0x63/0xb0
> [ 52.778588] exit_to_user_mode_prepare+0x132/0x140
> [ 52.779064] syscall_exit_to_user_mode+0x1d/0x40
> [ 52.779519] entry_SYSCALL_64_after_hwframe+0x44/0xae
> [ 52.780026] RIP: 0033:0x7f82c6f3815d
> [ 52.780384] Code: c2 20 00 00 75 10 b8 03 00 00 00 0f 05 48 3d 01
> f0 ff ff 73 31 c3 48 83 ec 08 e8 ee fb ff ff 48 89 04 24 b8 03 00 00
> 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 37 fc ff ff 48 89 d0 48 83 c4 08 48
> 3d 01
> test_module_attach:FAIL:delete_module unexpected success: 0
> libbpf: prog 'handle_fexit': failed to attach: No such file or directory
> test_module_attach:FAIL:attach_fexit unexpected error: -2
> #68 module_attach:FAIL
>
> and another in:
> ./test_progs -t module
> [ 156.660834] ------------[ cut here ]------------
> [ 156.661414] WARNING: CPU: 3 PID: 2511 at kernel/trace/ftrace.c:6321
> ftrace_module_enable+0x33a/0x370
> [ 156.662445] Modules linked in: bpf_testmod(O+) bpf_preload [last
> unloaded: bpf_testmod]
> [ 156.663325] CPU: 3 PID: 2511 Comm: test_progs Tainted: G W
> O 5.12.0-rc4-01652-gf03a9b92b5f3 #3293
> [ 156.664369] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS 1.11.0-2.el7 04/01/2014
> [ 156.665265] RIP: 0010:ftrace_module_enable+0x33a/0x370
> [ 156.665890] Code: 00 00 74 9d 48 0d 00 00 00 10 48 89 45 08 e9 db
> fe ff ff 8b 8b 98 01 00 00 48 01 ca 48 39 d0 0f 83 2c fd ff ff e9 66
> fd ff ff <0f> 0b e9 bd fe ff ff 0f 0b e9 b6 fe ff ff 48 83 78 10 00 0f
> 85 dd
> [ 156.667822] RSP: 0018:ffffc900001c7d50 EFLAGS: 00010206
> [ 156.668354] RAX: 0000000000000000 RBX: ffffffffa001c380 RCX: 0000000000005000
> [ 156.669079] RDX: 0000000000031045 RSI: ffffffffa0019080 RDI: 0000000000000000
> [ 156.669793] RBP: ffff888104bd9020 R08: ffffffff83174f00 R09: 0000000000000000
> [ 156.670529] R10: 0000000000000001 R11: ffffffffa0019080 R12: ffff88810092e480
> [ 156.671368] R13: 61c8864680b583eb R14: 0000000000000002 R15: 0000000000000000
> [ 156.672135] FS: 00007f198becc700(0000) GS:ffff888237d80000(0000)
> knlGS:0000000000000000
> [ 156.672973] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 156.673625] CR2: 00000000006a14f0 CR3: 00000001169be003 CR4: 00000000003706e0
> [ 156.674411] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 156.675209] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 156.675959] Call Trace:
> [ 156.676209] load_module+0x1f71/0x27d0
> [ 156.676623] ? __do_sys_finit_module+0x8f/0xc0
> [ 156.677084] __do_sys_finit_module+0x8f/0xc0
> [ 156.677525] do_syscall_64+0x2d/0x40
> [ 156.677932] entry_SYSCALL_64_after_hwframe+0x44/0xae
> [ 156.678465] RIP: 0033:0x7f198afa37f9
> [ 156.678837] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40
> 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 57 76 2b 00 f7 d8 64 89
> 01 48
> [ 156.680812] RSP: 002b:00007ffc428756d8 EFLAGS: 00000202 ORIG_RAX:
> 0000000000000139
> [ 156.681614] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f198afa37f9
> [ 156.682344] RDX: 0000000000000000 RSI: 00000000006a14f7 RDI: 0000000000000004
> [ 156.683111] RBP: 00007ffc428758b8 R08: 00007f198becc700 R09: 00007ffc428758b8
> [ 156.683842] R10: 00007f198becc700 R11: 0000000000000202 R12: 000000000040bce0
> [ 156.684590] R13: 00007ffc428758b0 R14: 0000000000000000 R15: 0000000000000000
> [ 156.685335] ---[ end trace 7086b04742183c35 ]---
> #58 ksyms_module:OK
>
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