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Revert "Fix: update block instrumentation for kernel 4.14"
author
Mathieu Desnoyers
<mathieu.desnoyers@efficios.com>
Thu, 5 Oct 2017 18:45:43 +0000
(14:45 -0400)
committer
Mathieu Desnoyers
<mathieu.desnoyers@efficios.com>
Thu, 5 Oct 2017 18:46:28 +0000
(14:46 -0400)
This reverts commit
49447902967115fe5a07ee7a1df3d17fbf4b1ab8
.
It introduces a NULL pointer dereference:
[ 37.862398] BUG: unable to handle kernel NULL pointer dereference at
0000000000000008
181.3 [ 37.864108] IP: [<
ffffffffa01c41b7
>] __event_probe__block_get_rq+0x127/0x4b0 [lttng_probe_block]
181.4 [ 37.864108] PGD
7a402067
PUD
7a4c7067
PMD 0
181.5 [ 37.864108] Oops: 0000 [#1] SMP
181.6 [ 37.864108] Modules linked in: lttng_probe_x86_exceptions(OE) lttng_probe_x86_irq_vectors(OE) lttng_probe_writeback(OE) lttng_probe_workqueue(OE) lttng_probe_vmscan(OE) lttng_probe_udp(OE) lttng_probe_timer(OE) lttng_probe_sunrpc(OE) lttng_probe_statedump(OE) lttng_probe_sock(OE) lttng_probe_skb(OE) lttng_probe_signal(OE) lttng_probe_scsi(OE) lttng_probe_sched(OE) lttng_probe_regulator(OE) lttng_probe_regmap(OE) lttng_probe_rcu(OE) lttng_probe_random(OE) lttng_probe_printk(OE) lttng_probe_power(OE) lttng_probe_net(OE) lttng_probe_napi(OE) lttng_probe_module(OE) lttng_probe_kvm_x86_mmu(OE) lttng_probe_kvm_x86(OE) lttng_probe_kvm(OE) lttng_probe_kmem(OE) lttng_probe_jbd2(OE) lttng_probe_irq(OE) lttng_probe_i2c(OE) lttng_probe_gpio(OE) lttng_probe_ext4(OE) lttng_probe_compaction(OE) lttng_probe_btrfs(OE) lttng_probe_block(OE) lttng_ring_buffer_metadata_mmap_client(OE) lttng_ring_buffer_client_mmap_overwrite(OE) lttng_ring_buffer_client_mmap_discard(OE) lttng_ring_buffer_metadata_client(OE) lttng_ring_buffer_client_overwrite(OE) lttng_ring_buffer_client_discard(OE) lttng_tracer(OE) lttng_statedump(OE) lttng_ftrace(OE) lttng_kprobes(OE) lttng_clock(OE) lttng_lib_ring_buffer(OE) lttng_kretprobes(OE)
181.7 [ 37.864108] CPU: 1 PID: 6 Comm: kworker/u4:0 Tainted: G OE 4.4.90 #1
181.8 [ 37.864108] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
181.9 [ 37.864108] Workqueue: events_freezable_power_ disk_events_workfn
181.10 [ 37.864108] task:
ffff88007c861bc0
ti:
ffff88007c868000
task.ti:
ffff88007c868000
181.11 [ 37.864108] RIP: 0010:[<
ffffffffa01c41b7
>] [<
ffffffffa01c41b7
>] __event_probe__block_get_rq+0x127/0x4b0 [lttng_probe_block]
181.12 [ 37.864108] RSP: 0018:
ffff88007c86ba98
EFLAGS:
00010246
181.13 [ 37.864108] RAX:
0000000000000000
RBX:
ffff880073683348
RCX:
ffff8800747d0000
181.14 [ 37.864108] RDX:
00000008d0c5bde9
RSI:
00000000000009f2
RDI:
0000000000400000
181.15 [ 37.864108] RBP:
ffff88007c86bba8
R08:
00000000001789ed
R09:
0000000000100000
181.16 [ 37.864108] R10:
ffffe8ffffd02460
R11:
0000000000000000
R12:
0000000000000000
181.17 [ 37.864108] R13:
0000000000017fe0
R14:
ffff88007363c6e8
R15:
ffff88007bef83c0
181.18 [ 37.864108] FS:
0000000000000000
(0000) GS:
ffff88007fd00000
(0000) knlGS:
0000000000000000
181.19 [ 37.864108] CS: 0010 DS: 0000 ES: 0000 CR0:
000000008005003b
181.20 [ 37.864108] CR2:
0000000000000008
CR3:
000000007a4d0000
CR4:
00000000000006e0
181.21 [ 37.864108] Stack:
181.22 [ 37.864108]
0000000000000000
ffffffff8115a46b
ffff88007c86bbe8
ffff88007bc67e30
181.23 [ 37.864108]
ffff880073683348
00000000ffffff01
ffff88007a7a1000
ffff88007c86bab8
181.24 [ 37.864108]
0000000000000028
0000000100000001
ffffe8ffffd02460
0000000000000035
181.25 [ 37.864108] Call Trace:
181.26 [ 37.864108] [<
ffffffff8115a46b
>] ? ktime_get_mono_fast_ns+0x4b/0x90
181.27 [ 37.864108] [<
ffffffff81532849
>] ? alloc_request_struct+0x19/0x20
181.28 [ 37.864108] [<
ffffffff811e8d8f
>] ? mempool_alloc+0x5f/0x150
181.29 [ 37.864108] [<
ffffffffa021815c
>] ? __event_probe__kmem_alloc+0x1dc/0x2c0 [lttng_probe_kmem]
181.30 [ 37.864108] [<
ffffffff810ad85e
>] ? kvm_clock_read+0x1e/0x20
181.31 [ 37.864108] [<
ffffffff81535f4f
>] get_request+0x4af/0x760
181.32 [ 37.864108] [<
ffffffff8112c270
>] ? wake_atomic_t_function+0x60/0x60
181.33 [ 37.864108] [<
ffffffff81536283
>] blk_get_request+0x83/0xe0
181.34 [ 37.864108] [<
ffffffff81773b5d
>] scsi_execute+0x3d/0x1d0
181.35 [ 37.864108] [<
ffffffff817758fe
>] scsi_execute_req_flags+0x8e/0xf0
181.36 [ 37.864108] [<
ffffffff81788f4d
>] sr_check_events+0x8d/0x2a0
181.37 [ 37.864108] [<
ffffffff81547590
>] ? disk_check_events+0x130/0x130
181.38 [ 37.864108] [<
ffffffff8181b618
>] cdrom_check_events+0x18/0x30
181.39 [ 37.864108] [<
ffffffff8178935a
>] sr_block_check_events+0x2a/0x30
181.40 [ 37.864108] [<
ffffffff815474b1
>] disk_check_events+0x51/0x130
181.41 [ 37.864108] [<
ffffffff815475a6
>] disk_events_workfn+0x16/0x20
181.42 [ 37.864108] [<
ffffffff81102b85
>] process_one_work+0x165/0x480
181.43 [ 37.864108] [<
ffffffff81102eeb
>] worker_thread+0x4b/0x4c0
181.44 [ 37.864108] [<
ffffffff81102ea0
>] ? process_one_work+0x480/0x480
181.45 [ 37.864108] [<
ffffffff81108d86
>] kthread+0xd6/0xf0
181.46 [ 37.864108] [<
ffffffff81108cb0
>] ? kthread_create_on_node+0x180/0x180
181.47 [ 37.864108] [<
ffffffff81aa690f
>] ret_from_fork+0x3f/0x70
181.48 [ 37.864108] [<
ffffffff81108cb0
>] ? kthread_create_on_node+0x180/0x180
181.49 [ 37.864108] Code: 00 00 00 00 48 89 85 20 ff ff ff 48 8d 85 10 ff ff ff 8b 73 04 48 89 85 28 ff ff ff 49 8b 47 48 ff 50 28 85 c0 0f 88 5d 01 00 00 <49> 8b 44 24 08 48 85 c0 0f 84 3d 03 00 00 8b 00 89 85 08 ff ff
181.50 [ 37.864108] RIP [<
ffffffffa01c41b7
>] __event_probe__block_get_rq+0x127/0x4b0 [lttng_probe_block]
181.51 [ 37.864108] RSP <
ffff88007c86ba98
>
181.52 [ 37.864108] CR2:
0000000000000008
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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