Hello
When updating the kernel to a post v4.6-rc1 version (based on
c05c2ec Merge branch 'parisc-4.6-2' of
git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux) I got
the following kernel panic on a T440p system with a 0bdb:193e Ericsson
Business Mobile Networks BV while probing with the ModemManager:
[ 31.819040] BUG: unable to handle kernel NULL pointer dereference at
0000000000000018
[ 31.821612] IP: [<ffffffffa078e078>] acm_start_wb+0x18/0xb0 [cdc_acm]
The complete backtrace is in the attached file dmesg.log.
I could track down to the problem to the following commit:
commit a81cf9799ad7299b03a4dff020d9685f9ac5f3e0
Author: Oliver Neukum <oneukum@xxxxxxxx>
Date: Wed Feb 10 10:39:49 2016 +0100
cdc-acm: implement put_char() and flush_chars()
This should cut down latencies and waste if the tty layer writes
single bytes.
Signed-off-by: Oliver Neukum >oneukum@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Reverting it let the problem disappear.
Please let me known if you need additional information,
Torsten
Please CC me on answers on the list.
[ 31.819040] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
[ 31.821612] IP: [<ffffffffa078e078>] acm_start_wb+0x18/0xb0 [cdc_acm]
[ 31.823520] PGD 0
[ 31.824120] Oops: 0000 [#1] SMP
[ 31.825068] Modules linked in: cdc_mbim snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi cdc_ncm usbnet cdc_acm cdc_wdm mii iwlmvm mac80211 iwlwifi cfg80211 snd_hda_intel snd_hda_codec snd_hda_core e1000e snd_hwdep psmouse snd_pcm thinkpad_acpi snd_timer snd soundcore nvram ipsec ipsec_cp(P) ipsec_eroutes(P) libfreeswan cipher_SHA1(PO) cipher_RMD(PO) cipher_AES(PO) cryptdev nls_iso8859_1 nls_cp437 vfat fat dm_mod sd_mod ahci i2c_i801 libahci i915 drm_kms_helper xhci_pci drm xhci_hcd fb_sys_fops sysimgblt sysfillrect ehci_pci syscopyarea i2c_algo_bit i2c_core video loop usb_storage ehci_hcd
[ 31.841846] CPU: 3 PID: 1568 Comm: kworker/u16:6 Tainted: P O 4.6.0-devel+ #1
[ 31.844280] Hardware name: LENOVO 20AWA00V00/20AWA00V00, BIOS GLET69WW (2.23 ) 04/25/2014
[ 31.847068] Workqueue: events_unbound flush_to_ldisc
[ 31.848524] task: ffff8804381a1a00 ti: ffff880438acc000 task.ti: ffff880438acc000
[ 31.850900] RIP: 0010:[<ffffffffa078e078>] [<ffffffffa078e078>] acm_start_wb+0x18/0xb0 [cdc_acm]
[ 31.853513] RSP: 0018:ffff880438acfcb0 EFLAGS: 00010002
[ 31.855091] RAX: 0000000000000000 RBX: ffff880427412000 RCX: 0000000000000001
[ 31.857557] RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff880427412000
[ 31.859689] RBP: ffff880438acfcc8 R08: 0000000000000000 R09: ffffc90003694000
[ 31.862031] R10: 0000000000000000 R11: 00000000ffffffff R12: ffff880427412000
[ 31.864155] R13: 0000000000000246 R14: 0000000000000000 R15: 0000000000000000
[ 31.866439] FS: 0000000000000000(0000) GS:ffff88044e2c0000(0000) knlGS:0000000000000000
[ 31.868829] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 31.872201] CR2: 0000000000000018 CR3: 0000000001a07000 CR4: 00000000001406a0
[ 31.875916] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 31.879703] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 31.883236] Stack:
[ 31.885242] ffff880427412000 ffff880427412744 0000000000000246 ffff880438acfd00
[ 31.889147] ffffffffa078ebd3 ffff88043840e000 ffffc90003694000 ffffc90003694000
[ 31.892905] 0000000000000001 ffff880097dc3021 ffff880438acfdb0 ffffffff8136e900
[ 31.896524] Call Trace:
[ 31.898603] [<ffffffffa078ebd3>] acm_tty_flush_chars+0x63/0xa0 [cdc_acm]
[ 31.902128] [<ffffffff8136e900>] n_tty_receive_buf_common+0x5d0/0xc00
[ 31.905567] [<ffffffff8107dfc4>] ? set_next_entity+0x3f4/0x880
[ 31.908681] [<ffffffff8136ef44>] n_tty_receive_buf2+0x14/0x20
[ 31.912026] [<ffffffff813710e2>] tty_ldisc_receive_buf+0x22/0x50
[ 31.915169] [<ffffffff813716c7>] flush_to_ldisc+0xc7/0x130
[ 31.918163] [<ffffffff8106563d>] process_one_work+0x14d/0x410
[ 31.921461] [<ffffffff81065ca9>] worker_thread+0x69/0x4a0
[ 31.924669] [<ffffffff81065c40>] ? rescuer_thread+0x340/0x340
[ 31.927720] [<ffffffff8106acbb>] kthread+0xdb/0x100
[ 31.930685] [<ffffffff815a6c42>] ret_from_fork+0x22/0x40
[ 31.933602] [<ffffffff8106abe0>] ? kthread_park+0x60/0x60
[ 31.936783] Code: c8 f7 da 83 e2 40 09 f0 09 d0 c3 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 55 41 54 53 83 87 40 07 00 00 01 49 89 fc <48> 8b 46 18 48 8b 16 48 89 f3 48 89 50 68 48 8b 46 18 48 8b 56
[ 31.943788] RIP [<ffffffffa078e078>] acm_start_wb+0x18/0xb0 [cdc_acm]
[ 31.947155] RSP <ffff880438acfcb0>
[ 31.949611] CR2: 0000000000000018
[ 31.952011] ---[ end trace b34d9c31926cfa72 ]---
[ 31.954772] ------------[ cut here ]------------
[ 31.957550] WARNING: CPU: 3 PID: 1568 at kernel/softirq.c:150 __local_bh_enable_ip+0x8c/0xc0
[ 31.961667] Modules linked in: cdc_mbim snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi cdc_ncm usbnet cdc_acm cdc_wdm mii iwlmvm mac80211 iwlwifi cfg80211 snd_hda_intel snd_hda_codec snd_hda_core e1000e snd_hwdep psmouse snd_pcm thinkpad_acpi snd_timer snd soundcore nvram ipsec ipsec_cp(P) ipsec_eroutes(P) libfreeswan cipher_SHA1(PO) cipher_RMD(PO) cipher_AES(PO) cryptdev nls_iso8859_1 nls_cp437 vfat fat dm_mod sd_mod ahci i2c_i801 libahci i915 drm_kms_helper xhci_pci drm xhci_hcd fb_sys_fops sysimgblt sysfillrect ehci_pci syscopyarea i2c_algo_bit i2c_core video loop usb_storage ehci_hcd
[ 31.983193] CPU: 3 PID: 1568 Comm: kworker/u16:6 Tainted: P D O 4.6.0-devel+ #1
[ 31.987438] Hardware name: LENOVO 20AWA00V00/20AWA00V00, BIOS GLET69WW (2.23 ) 04/25/2014
[ 31.991518] 0000000000000000 ffff880438acf998 ffffffff812c25a2 0000000000000000
[ 31.995314] 0000000000000000 ffff880438acf9d8 ffffffff8104e8f1 0000009638acf9c8
[ 31.999005] 0000000000000200 ffffffff810c73a4 0000000000000000 ffff8804381a1a00
[ 32.002283] Call Trace:
[ 32.004342] [<ffffffff812c25a2>] dump_stack+0x67/0x95
[ 32.007552] [<ffffffff8104e8f1>] __warn+0xd1/0xf0
[ 32.011107] [<ffffffff810c73a4>] ? cgroup_exit+0x54/0xb0
[ 32.014423] [<ffffffff8104e9dd>] warn_slowpath_null+0x1d/0x20
[ 32.016927] vboxdrv: Found 4 processor cores
[ 32.020021] [<ffffffff8105343c>] __local_bh_enable_ip+0x8c/0xc0
[ 32.022679] [<ffffffff815a653a>] _raw_spin_unlock_bh+0x1a/0x20
[ 32.025289] [<ffffffff810c73a4>] cgroup_exit+0x54/0xb0
[ 32.027719] [<ffffffff810513dd>] do_exit+0x35d/0xbd0
[ 32.030096] [<ffffffff8101dced>] oops_end+0x6d/0x90
[ 32.032456] [<ffffffff8103f95e>] no_context+0x10e/0x350
[ 32.034908] [<ffffffff8112a90c>] ? zone_statistics+0x7c/0xa0
[ 32.037453] [<ffffffff8103fc21>] __bad_area_nosemaphore+0x81/0x200
[ 32.040150] [<ffffffff812c23af>] ? cpumask_next_and+0x2f/0x40
[ 32.042732] [<ffffffff8103fdb4>] bad_area_nosemaphore+0x14/0x20
[ 32.045329] [<ffffffff810400db>] __do_page_fault+0x8b/0x4b0
[ 32.047801] [<ffffffff81001108>] ? trace_hardirqs_off_thunk+0x1b/0x1d
[ 32.050651] [<ffffffff8104050c>] do_page_fault+0xc/0x10
[ 32.053226] [<ffffffff815a8332>] page_fault+0x22/0x30
[ 32.055648] [<ffffffffa078e078>] ? acm_start_wb+0x18/0xb0 [cdc_acm]
[ 32.058250] [<ffffffffa078ebd3>] acm_tty_flush_chars+0x63/0xa0 [cdc_acm]
[ 32.061216] [<ffffffff8136e900>] n_tty_receive_buf_common+0x5d0/0xc00
[ 32.063860] [<ffffffff8107dfc4>] ? set_next_entity+0x3f4/0x880
[ 32.066515] [<ffffffff8136ef44>] n_tty_receive_buf2+0x14/0x20
[ 32.068948] [<ffffffff813710e2>] tty_ldisc_receive_buf+0x22/0x50
[ 32.071684] [<ffffffff813716c7>] flush_to_ldisc+0xc7/0x130
[ 32.074039] [<ffffffff8106563d>] process_one_work+0x14d/0x410
[ 32.076621] [<ffffffff81065ca9>] worker_thread+0x69/0x4a0
[ 32.078949] [<ffffffff81065c40>] ? rescuer_thread+0x340/0x340
[ 32.081527] [<ffffffff8106acbb>] kthread+0xdb/0x100
[ 32.083698] [<ffffffff815a6c42>] ret_from_fork+0x22/0x40
[ 32.086219] [<ffffffff8106abe0>] ? kthread_park+0x60/0x60
[ 32.088534] ---[ end trace b34d9c31926cfa73 ]---
[ 32.091087] BUG: unable to handle kernel [ 32.091115] vboxdrv: TSC mode is Invariant, tentative frequency 2893290343 Hz
