LTTng » LTTng-modules

I was trying out the new live streaming feature and stumbled upon a kernel crash when issuing CTRL-C to the sessiond.

Here the kernel crash log:

Nov 13 15:08:11 Tau kernel: ring buffer relay-metadata: 2 records written, 0 records overrun
Nov 13 15:08:11 Tau kernel: [96B blob data]
Nov 13 15:08:11 Tau kernel: ring buffer: relay-metadata, cpu -1: 8192 bytes committed
Nov 13 15:08:12 Tau sudo[19434]: pam_unix(sudo:session): session closed for user root
Nov 13 15:08:12 Tau kernel: BUG: unable to handle kernel paging request at ffffffffa0988b38
Nov 13 15:08:12 Tau kernel: IP: [<ffffffffa08ebc10>] lttng_stream_ring_buffer_ioctl+0xd0/0x1a0 [lttng_tracer]
Nov 13 15:08:12 Tau kernel: PGD 180f067 PUD 1813063 PMD 22ac2c067 PTE 0
Nov 13 15:08:12 Tau kernel: Oops: 0000 [#1] PREEMPT SMP 
Nov 13 15:08:12 Tau kernel: Modules linked in: lttng_tracer(O) lttng_statedump(O) lttng_ftrace(O) lttng_kprobes(O) lttng_lib_ring_buffer(O) lttng_kr
Nov 13 15:08:12 Tau kernel:  xts lrw gf128mul ablk_helper cryptd ehci_pci ext4 crc16 jbd2 mbcache ehci_hcd usbcore usb_common sd_mod ahci libahci libata scsi_m
Nov 13 15:08:12 Tau kernel: CPU 3 
Nov 13 15:08:12 Tau kernel: Pid: 19684, comm: lttng-consumerd Tainted: G           O 3.8.6-1-ARCH #1 LENOVO 0831CTO/0831CTO
Nov 13 15:08:12 Tau kernel: RIP: 0010:[<ffffffffa08ebc10>]  [<ffffffffa08ebc10>] lttng_stream_ring_buffer_ioctl+0xd0/0x1a0 [lttng_tracer]
Nov 13 15:08:12 Tau kernel: RSP: 0018:ffff880217077ea8  EFLAGS: 00010286
Nov 13 15:08:12 Tau kernel: RAX: ffffffffa0988ac0 RBX: ffff8801e202ba00 RCX: 00007ff5ead3ab58
Nov 13 15:08:12 Tau kernel: RDX: ffff880217077ea8 RSI: ffffe8ffffc00cb0 RDI: ffff8801f5f96c68
Nov 13 15:08:12 Tau kernel: RBP: ffff880217077ec0 R08: ffffe8ffffc00cb0 R09: ffff8801e202ba00
Nov 13 15:08:12 Tau kernel: R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff5ead3ab58
Nov 13 15:08:12 Tau kernel: R13: 00007ff5ead3ab58 R14: 00007ff5ead3ab58 R15: 0000000000000001
Nov 13 15:08:12 Tau kernel: FS:  00007ff5ead3b700(0000) GS:ffff88023bd80000(0000) knlGS:0000000000000000
Nov 13 15:08:12 Tau kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Nov 13 15:08:12 Tau kernel: CR2: ffffffffa0988b38 CR3: 00000001db7a8000 CR4: 00000000000007e0
Nov 13 15:08:12 Tau kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Nov 13 15:08:12 Tau kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Nov 13 15:08:12 Tau kernel: Process lttng-consumerd (pid: 19684, threadinfo ffff880217076000, task ffff8801d0bfdc20)
Nov 13 15:08:12 Tau kernel: Stack:
Nov 13 15:08:12 Tau kernel:  ffff8801e92a8010 ffff8801e202ba00 ffff880232f746d8 ffff880217077f30
Nov 13 15:08:12 Tau kernel:  ffffffff81199775 0000000000000000 0000000000000000 ffff8801e92a8010
Nov 13 15:08:12 Tau kernel:  0000000000000008 0000000000000001 ffff8802237ca238 ffff8801e202ba00
Nov 13 15:08:12 Tau kernel: Call Trace:
Nov 13 15:08:12 Tau kernel:  [<ffffffff81199775>] do_vfs_ioctl+0x2e5/0x4d0
Nov 13 15:08:12 Tau kernel:  [<ffffffff811999e1>] sys_ioctl+0x81/0xa0
Nov 13 15:08:12 Tau kernel:  [<ffffffff814c735d>] system_call_fastpath+0x1a/0x1f
Nov 13 15:08:12 Tau kernel: Code: 00 85 c0 79 c6 66 0f 1f 44 00 00 48 c7 c0 da ff ff ff eb c5 0f 1f 80 00 00 00 00 48 8b 42 48 48 85 c0 74 e7 48 8d 55 e8 4c 89
Nov 13 15:08:12 Tau kernel: RIP  [<ffffffffa08ebc10>] lttng_stream_ring_buffer_ioctl+0xd0/0x1a0 [lttng_tracer]
Nov 13 15:08:12 Tau kernel:  RSP <ffff880217077ea8>
Nov 13 15:08:12 Tau kernel: CR2: ffffffffa0988b38
Nov 13 15:08:12 Tau kernel: ---[ end trace 7ce7dcdb7dc4e6f9 ]---
Nov 13 15:08:12 Tau kernel: BUG: unable to handle kernel paging request at ffffffffa0988b68
Nov 13 15:08:12 Tau kernel: IP: [<ffffffffa08ebbe0>] lttng_stream_ring_buffer_ioctl+0xa0/0x1a0 [lttng_tracer]
Nov 13 15:08:12 Tau kernel: PGD 180f067 PUD 1813063 PMD 22ac2c067 PTE 0
Nov 13 15:08:12 Tau kernel: Oops: 0000 [#2] PREEMPT SMP 
Nov 13 15:08:12 Tau kernel: Modules linked in: lttng_tracer(O) lttng_statedump(O) lttng_ftrace(O) lttng_kprobes(O) lttng_lib_ring_buffer(O) lttng_kr
Nov 13 15:08:12 Tau kernel:  xts lrw gf128mul ablk_helper cryptd ehci_pci ext4 crc16 jbd2 mbcache ehci_hcd usbcore usb_common sd_mod ahci libahci libata scsi_m
Nov 13 15:08:12 Tau kernel: CPU 0 
Nov 13 15:08:12 Tau kernel: Pid: 19686, comm: lttng-consumerd Tainted: G      D    O 3.8.6-1-ARCH #1 LENOVO 0831CTO/0831CTO
Nov 13 15:08:12 Tau kernel: RIP: 0010:[<ffffffffa08ebbe0>]  [<ffffffffa08ebbe0>] lttng_stream_ring_buffer_ioctl+0xa0/0x1a0 [lttng_tracer]
Nov 13 15:08:12 Tau kernel: RSP: 0018:ffff8801a74ebea8  EFLAGS: 00010286
Nov 13 15:08:12 Tau kernel: RAX: ffffffffa0988ac0 RBX: ffff88021ce37800 RCX: 00007ff5e9d38af8
Nov 13 15:08:12 Tau kernel: RDX: ffff8801a74ebea8 RSI: ffffe8ffffd80cb0 RDI: ffff8801f5f96c68
Nov 13 15:08:12 Tau kernel: RBP: ffff8801a74ebec0 R08: ffffe8ffffd80cb0 R09: ffff88021ce37800
Nov 13 15:08:12 Tau kernel: R10: 0000000000000008 R11: 0000000000000246 R12: 00007ff5e9d38af8
Nov 13 15:08:12 Tau kernel: R13: 00007ff5e9d38af8 R14: 00007ff5e9d38af8 R15: 0000000000000001
Nov 13 15:08:12 Tau kernel: FS:  00007ff5e9d39700(0000) GS:ffff88023bc00000(0000) knlGS:0000000000000000
Nov 13 15:08:12 Tau kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Nov 13 15:08:12 Tau kernel: CR2: ffffffffa0988b68 CR3: 00000001db7a8000 CR4: 00000000000007f0
Nov 13 15:08:12 Tau kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Nov 13 15:08:12 Tau kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Nov 13 15:08:12 Tau kernel: Process lttng-consumerd (pid: 19686, threadinfo ffff8801a74ea000, task ffff88022ff72180)
Nov 13 15:08:12 Tau kernel: Stack:
Nov 13 15:08:12 Tau kernel:  00007ff5d8003b70 ffff88021ce37800 ffff880232f746d8 ffff8801a74ebf30
Nov 13 15:08:12 Tau kernel:  ffffffff81199775 0000380000000000 0000000000000000 0000000000000001
Nov 13 15:08:12 Tau kernel:  000000000000002e 000000000001fffe 0000000000000001 ffff88021ce37800
Nov 13 15:08:12 Tau kernel: Call Trace:
Nov 13 15:08:12 Tau kernel:  [<ffffffff81199775>] do_vfs_ioctl+0x2e5/0x4d0
Nov 13 15:08:12 Tau kernel:  [<ffffffff811999e1>] sys_ioctl+0x81/0xa0
Nov 13 15:08:12 Tau kernel:  [<ffffffff814c735d>] system_call_fastpath+0x1a/0x1f
Nov 13 15:08:12 Tau kernel: Code: 89 e1 e8 14 92 98 e0 48 98 48 83 c4 08 5b 41 5c 5d c3 66 0f 1f 84 00 00 00 00 00 48 8b 42 48 48 85 c0 74 17 48 8d 55 e8 4c 89
Nov 13 15:08:12 Tau kernel: RIP  [<ffffffffa08ebbe0>] lttng_stream_ring_buffer_ioctl+0xa0/0x1a0 [lttng_tracer]
Nov 13 15:08:12 Tau kernel:  RSP <ffff8801a74ebea8>
Nov 13 15:08:12 Tau kernel: CR2: ffffffffa0988b68
Nov 13 15:08:12 Tau kernel: ---[ end trace 7ce7dcdb7dc4e6fa ]---