Hello,
I am having problem booting 4.9.0-rc6+ on my laptop.
4.9.0-rc5+ works, so not likely hardware issues.
Ubuntu Zesty Zapus
###
gcc-6 with
CONFIG_PCI_QUIRKS=y
CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS=y
After grub, screen turns off. No pre modeset messages. Then system
reboot itself.
When
CONFIG_PCI_QUIRKS not set
CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS not set
System would boot up to: "Clocksource: Switched to clocksource hpet". then loop
'''
Could not create tracefs '' directory
Could not create directory for event
'''
###
gcc-4.9 system would panic with above settings on.
With them off, setting would boot to login prompt. Only one working terminal.
Login works.
dmesg works
lsmod hangs
[ 8.436647] BUG: unable to handle kernel paging request at 0000000016000000
[ 8.437448] IP: [<ffffffff974dea56>] strcmp+0x16/0x30
[ 8.438224] PGD 0
[ 8.438992] Oops: 0000 [#1] SMP
[ 8.439750] Modules linked in:
[ 8.440506] CPU: 6 PID: 430 Comm: systemd-udevd Not tainted 4.9.0-rc6+ #14
[ 8.441266] Hardware name: Notebook
P15SM-A/SM1-A /P15SM-A/SM1-A ,
BIOS 4.6.5 04/20/2015
[ 8.442239] task: ffffa3d3a436e3c0 task.stack: ffffba3641604000
[ 8.443033] RIP: 0010:[<ffffffff974dea56>] [<ffffffff974dea56>]
strcmp+0x16/0x30
[ 8.443828] RSP: 0018:ffffba3641607bf0 EFLAGS: 00010202
[ 8.444603] RAX: 000000000000006d RBX: ffffffff97fc33c0 RCX: 0000000000000a1f
[ 8.445382] RDX: 000000000000143e RSI: 0000000016000001 RDI: ffffba3641669fe7
[ 8.446149] RBP: ffffba3641607bf0 R08: ffffffff9716cb90 R09: ffffffffc0409000
[ 8.446917] R10: 00003fffffe00000 R11: 0000000000002000 R12: 0000000000000a1f
[ 8.447683] R13: 0000000000000010 R14: 000000000000143e R15: 0000000000000000
[ 8.448446] FS: 00007f4830a4c8c0(0000) GS:ffffa3d3afb80000(0000)
knlGS:0000000000000000
[ 8.449202] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 8.449957] CR2: 0000000016000000 CR3: 0000000224a12000 CR4: 00000000001406e0
[ 8.450710] Stack:
[ 8.451457] ffffba3641607c00 ffffffff9716cba2 ffffba3641607c50
ffffffff974ebede
[ 8.452232] ffffffff9716cb90 ffffffff97fb91d0 ffffba3641669fe6
ffffba3641607cb8
[ 8.453005] 0000000000000000 ffffffff97c2e840 ffffba3641687f00
ffffba3641607e80
[ 8.453779] Call Trace:
[ 8.454608] [<ffffffff9716cba2>] cmp_name+0x12/0x20
[ 8.455621] [<ffffffff974ebede>] bsearch+0x5e/0x90
[ 8.456656] [<ffffffff9716cb90>] ? unregister_module_notifier+0x20/0x20
[ 8.457444] [<ffffffff9716cd2b>] find_symbol_in_section+0x3b/0xf0
[ 8.458228] [<ffffffff9716ccf0>] ? mod_find_symname+0x70/0x70
[ 8.459018] [<ffffffff9716d8d6>] each_symbol_section+0x26/0x50
[ 8.459801] [<ffffffff9716d9d6>] find_symbol+0x36/0xa0
[ 8.460570] [<ffffffff9716cbf8>] ? find_sec+0x48/0x80
[ 8.461553] [<ffffffff9716e82a>] resolve_symbol.isra.61+0x4a/0xb0
[ 8.461556] [<ffffffff9716df36>] ? get_modinfo.isra.56+0x46/0xa0
[ 8.461558] [<ffffffff9716fdb7>] load_module+0xc57/0x2700
[ 8.461560] [<ffffffff97480dc4>] ? ima_post_read_file+0x74/0x90
[ 8.461563] [<ffffffff9743e23b>] ? security_kernel_post_read_file+0x6b/0x80
[ 8.461566] [<ffffffff9727c7f2>] ? kernel_read_file+0x172/0x190
[ 8.461568] [<ffffffff97171a56>] SYSC_finit_module+0x96/0xd0
[ 8.461569] [<ffffffff97171aae>] SyS_finit_module+0xe/0x10
[ 8.461571] [<ffffffff97002b1a>] do_syscall_64+0x6a/0x220
[ 8.461574] [<ffffffff97a0a08a>] entry_SYSCALL64_slow_path+0x25/0x25
[ 8.461591] Code: 01 0f b6 4e ff 48 83 c2 01 84 c9 88 4a ff 75 ed
5d c3 0f 1f 00 55 48 89 e5 eb 04 84 c0 74 18 48 83 c7 01 48 83 c6 01
0f b6 47 ff <3a> 46 ff 74 eb 19 c0 5d 83 c8 01 c3 31 c0 5d c3 66 2e 0f
1f 84
[ 8.461593] RIP [<ffffffff974dea56>] strcmp+0x16/0x30
[ 8.461594] RSP <ffffba3641607bf0>
[ 8.461594] CR2: 0000000016000000
[ 8.461605] ---[ end trace 470acb4c22b46ca8 ]---
[ 7.367754] BUG: unable to handle kernel paging request at 000000002c000000
[ 7.368663] IP: [<ffffffffad4dddc6>] strcmp+0x16/0x30
[ 7.369408] PGD 0
[ 7.370111] Oops: 0000 [#1] SMP
[ 7.370805] Modules linked in:
[ 7.371504] CPU: 0 PID: 360 Comm: systemd-modules Tainted: G
O 4.9.0-rc5 #17
[ 7.372211] Hardware name: Notebook
P15SM-A/SM1-A /P15SM-A/SM1-A ,
BIOS 4.6.5 04/20/2015
[ 7.372963] task: ffff8f02659b4740 task.stack: ffffa9de81274000
[ 7.373687] RIP: 0010:[<ffffffffad4dddc6>] [<ffffffffad4dddc6>]
strcmp+0x16/0x30
[ 7.374444] RSP: 0018:ffffa9de81277c20 EFLAGS: 00010202
[ 7.375169] RAX: 0000000000000070 RBX: ffffffffadfc3390 RCX: 0000000000000a1e
[ 7.375899] RDX: 000000000000143d RSI: 000000002c000001 RDI: ffffa9de811f2da1
[ 7.376633] RBP: ffffa9de81277c20 R08: ffffffffad16c550 R09: ffffffffc03ca000
[ 7.377364] R10: 00003fffffe00000 R11: 0000000000002000 R12: 0000000000000a1e
[ 7.378097] R13: 0000000000000010 R14: 000000000000143d R15: 0000000000000000
[ 7.378832] FS: 00007fa5291ef8c0(0000) GS:ffff8f026fa00000(0000)
knlGS:0000000000000000
[ 7.379591] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 7.380327] CR2: 000000002c000000 CR3: 00000002228f0000 CR4: 00000000001406f0
[ 7.381073] Stack:
[ 7.381796] ffffa9de81277c30 ffffffffad16c562 ffffa9de81277c80
ffffffffad4eb23e
[ 7.382557] ffffffffad16c550 ffffffffadfb91b0 ffffa9de811f2da0
ffffa9de81277ce8
[ 7.383275] 0000000000000000 ffffffffadc2e7c0 ffffa9de811f46b0
ffffa9de81277eb0
[ 7.383986] Call Trace:
[ 7.384697] [<ffffffffad16c562>] cmp_name+0x12/0x20
[ 7.385403] [<ffffffffad4eb23e>] bsearch+0x5e/0x90
[ 7.386188] [<ffffffffad16c550>] ? unregister_module_notifier+0x20/0x20
[ 7.387304] [<ffffffffad16c6eb>] find_symbol_in_section+0x3b/0xf0
[ 7.388407] [<ffffffffad16c6b0>] ? mod_find_symname+0x70/0x70
[ 7.389504] [<ffffffffad16d296>] each_symbol_section+0x26/0x50
[ 7.390590] [<ffffffffad16d396>] find_symbol+0x36/0xa0
[ 7.391662] [<ffffffffad16c5b8>] ? find_sec+0x48/0x80
[ 7.392734] [<ffffffffad16e1ea>] resolve_symbol.isra.61+0x4a/0xb0
[ 7.393804] [<ffffffffad16d8f6>] ? get_modinfo.isra.56+0x46/0xa0
[ 7.394880] [<ffffffffad16f777>] load_module+0xc57/0x2700
[ 7.395948] [<ffffffffad4800b4>] ? ima_post_read_file+0x74/0x90
[ 7.397015] [<ffffffffad43d6cb>] ? security_kernel_post_read_file+0x6b/0x80
[ 7.398070] [<ffffffffad27bfd2>] ? kernel_read_file+0x172/0x190
[ 7.399118] [<ffffffffad171416>] SYSC_finit_module+0x96/0xd0
[ 7.400169] [<ffffffffad17146e>] SyS_finit_module+0xe/0x10
[ 7.401205] [<ffffffffada08b64>] entry_SYSCALL_64_fastpath+0x17/0x98
[ 7.402242] Code: 01 0f b6 4e ff 48 83 c2 01 84 c9 88 4a ff 75 ed
5d c3 0f 1f 00 55 48 89 e5 eb 04 84 c0 74 18 48 83 c7 01 48 83 c6 01
0f b6 47 ff <3a> 46 ff 74 eb 19 c0 5d 83 c8 01 c3 31 c0 5d c3 66 2e 0f
1f 84
[ 7.403491] RIP [<ffffffffad4dddc6>] strcmp+0x16/0x30
[ 7.404605] RSP <ffffa9de81277c20>
[ 7.405706] CR2: 000000002c000000
[ 7.406815] ---[ end trace 5658e0e68fb01f05 ]---
Thanks
Kui.Z
Looks like my boot issue might be kvm related. System boots fine with
CONFIG_KVM=m
--- .config 2016-11-29 02:41:24.753930839 -0800
+++ .config.working 2016-11-29 02:41:11.029065291 -0800
@@ -3544,7 +3544,7 @@
# CONFIG_IMG_ASCII_LCD is not set
# CONFIG_UIO is not set
# CONFIG_VFIO is not set
-CONFIG_IRQ_BYPASS_MANAGER=y
+CONFIG_IRQ_BYPASS_MANAGER=m
# CONFIG_VIRT_DRIVERS is not set
#
@@ -4553,7 +4553,7 @@
CONFIG_KVM_COMPAT=y
CONFIG_HAVE_KVM_IRQ_BYPASS=y
CONFIG_VIRTUALIZATION=y
-CONFIG_KVM=y
+CONFIG_KVM=m
CONFIG_KVM_INTEL=m
# CONFIG_KVM_AMD is not set
# CONFIG_KVM_MMU_AUDIT is not set
On Sun, Nov 27, 2016 at 2:23 PM, Kui Zhang <[email protected]> wrote:
> Hello,
>
> I am having problem booting 4.9.0-rc6+ on my laptop.
>
> 4.9.0-rc5+ works, so not likely hardware issues.
>
>
> Ubuntu Zesty Zapus
>
> ###
> gcc-6 with
>
> CONFIG_PCI_QUIRKS=y
> CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS=y
>
> After grub, screen turns off. No pre modeset messages. Then system
> reboot itself.
>
> When
>
> CONFIG_PCI_QUIRKS not set
> CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS not set
>
>
> System would boot up to: "Clocksource: Switched to clocksource hpet". then loop
>
> '''
> Could not create tracefs '' directory
> Could not create directory for event
> '''
>
> ###
> gcc-4.9 system would panic with above settings on.
>
> With them off, setting would boot to login prompt. Only one working terminal.
>
> Login works.
> dmesg works
>
> lsmod hangs
>
>
>
> [ 8.436647] BUG: unable to handle kernel paging request at 0000000016000000
> [ 8.437448] IP: [<ffffffff974dea56>] strcmp+0x16/0x30
> [ 8.438224] PGD 0
>
> [ 8.438992] Oops: 0000 [#1] SMP
> [ 8.439750] Modules linked in:
> [ 8.440506] CPU: 6 PID: 430 Comm: systemd-udevd Not tainted 4.9.0-rc6+ #14
> [ 8.441266] Hardware name: Notebook
> P15SM-A/SM1-A /P15SM-A/SM1-A ,
> BIOS 4.6.5 04/20/2015
> [ 8.442239] task: ffffa3d3a436e3c0 task.stack: ffffba3641604000
> [ 8.443033] RIP: 0010:[<ffffffff974dea56>] [<ffffffff974dea56>]
> strcmp+0x16/0x30
> [ 8.443828] RSP: 0018:ffffba3641607bf0 EFLAGS: 00010202
> [ 8.444603] RAX: 000000000000006d RBX: ffffffff97fc33c0 RCX: 0000000000000a1f
> [ 8.445382] RDX: 000000000000143e RSI: 0000000016000001 RDI: ffffba3641669fe7
> [ 8.446149] RBP: ffffba3641607bf0 R08: ffffffff9716cb90 R09: ffffffffc0409000
> [ 8.446917] R10: 00003fffffe00000 R11: 0000000000002000 R12: 0000000000000a1f
> [ 8.447683] R13: 0000000000000010 R14: 000000000000143e R15: 0000000000000000
> [ 8.448446] FS: 00007f4830a4c8c0(0000) GS:ffffa3d3afb80000(0000)
> knlGS:0000000000000000
> [ 8.449202] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 8.449957] CR2: 0000000016000000 CR3: 0000000224a12000 CR4: 00000000001406e0
> [ 8.450710] Stack:
> [ 8.451457] ffffba3641607c00 ffffffff9716cba2 ffffba3641607c50
> ffffffff974ebede
> [ 8.452232] ffffffff9716cb90 ffffffff97fb91d0 ffffba3641669fe6
> ffffba3641607cb8
> [ 8.453005] 0000000000000000 ffffffff97c2e840 ffffba3641687f00
> ffffba3641607e80
> [ 8.453779] Call Trace:
> [ 8.454608] [<ffffffff9716cba2>] cmp_name+0x12/0x20
> [ 8.455621] [<ffffffff974ebede>] bsearch+0x5e/0x90
> [ 8.456656] [<ffffffff9716cb90>] ? unregister_module_notifier+0x20/0x20
> [ 8.457444] [<ffffffff9716cd2b>] find_symbol_in_section+0x3b/0xf0
> [ 8.458228] [<ffffffff9716ccf0>] ? mod_find_symname+0x70/0x70
> [ 8.459018] [<ffffffff9716d8d6>] each_symbol_section+0x26/0x50
> [ 8.459801] [<ffffffff9716d9d6>] find_symbol+0x36/0xa0
> [ 8.460570] [<ffffffff9716cbf8>] ? find_sec+0x48/0x80
> [ 8.461553] [<ffffffff9716e82a>] resolve_symbol.isra.61+0x4a/0xb0
> [ 8.461556] [<ffffffff9716df36>] ? get_modinfo.isra.56+0x46/0xa0
> [ 8.461558] [<ffffffff9716fdb7>] load_module+0xc57/0x2700
> [ 8.461560] [<ffffffff97480dc4>] ? ima_post_read_file+0x74/0x90
> [ 8.461563] [<ffffffff9743e23b>] ? security_kernel_post_read_file+0x6b/0x80
> [ 8.461566] [<ffffffff9727c7f2>] ? kernel_read_file+0x172/0x190
> [ 8.461568] [<ffffffff97171a56>] SYSC_finit_module+0x96/0xd0
> [ 8.461569] [<ffffffff97171aae>] SyS_finit_module+0xe/0x10
> [ 8.461571] [<ffffffff97002b1a>] do_syscall_64+0x6a/0x220
> [ 8.461574] [<ffffffff97a0a08a>] entry_SYSCALL64_slow_path+0x25/0x25
> [ 8.461591] Code: 01 0f b6 4e ff 48 83 c2 01 84 c9 88 4a ff 75 ed
> 5d c3 0f 1f 00 55 48 89 e5 eb 04 84 c0 74 18 48 83 c7 01 48 83 c6 01
> 0f b6 47 ff <3a> 46 ff 74 eb 19 c0 5d 83 c8 01 c3 31 c0 5d c3 66 2e 0f
> 1f 84
> [ 8.461593] RIP [<ffffffff974dea56>] strcmp+0x16/0x30
> [ 8.461594] RSP <ffffba3641607bf0>
> [ 8.461594] CR2: 0000000016000000
> [ 8.461605] ---[ end trace 470acb4c22b46ca8 ]---
>
>
> [ 7.367754] BUG: unable to handle kernel paging request at 000000002c000000
> [ 7.368663] IP: [<ffffffffad4dddc6>] strcmp+0x16/0x30
> [ 7.369408] PGD 0
>
> [ 7.370111] Oops: 0000 [#1] SMP
> [ 7.370805] Modules linked in:
> [ 7.371504] CPU: 0 PID: 360 Comm: systemd-modules Tainted: G
> O 4.9.0-rc5 #17
> [ 7.372211] Hardware name: Notebook
> P15SM-A/SM1-A /P15SM-A/SM1-A ,
> BIOS 4.6.5 04/20/2015
> [ 7.372963] task: ffff8f02659b4740 task.stack: ffffa9de81274000
> [ 7.373687] RIP: 0010:[<ffffffffad4dddc6>] [<ffffffffad4dddc6>]
> strcmp+0x16/0x30
> [ 7.374444] RSP: 0018:ffffa9de81277c20 EFLAGS: 00010202
> [ 7.375169] RAX: 0000000000000070 RBX: ffffffffadfc3390 RCX: 0000000000000a1e
> [ 7.375899] RDX: 000000000000143d RSI: 000000002c000001 RDI: ffffa9de811f2da1
> [ 7.376633] RBP: ffffa9de81277c20 R08: ffffffffad16c550 R09: ffffffffc03ca000
> [ 7.377364] R10: 00003fffffe00000 R11: 0000000000002000 R12: 0000000000000a1e
> [ 7.378097] R13: 0000000000000010 R14: 000000000000143d R15: 0000000000000000
> [ 7.378832] FS: 00007fa5291ef8c0(0000) GS:ffff8f026fa00000(0000)
> knlGS:0000000000000000
> [ 7.379591] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 7.380327] CR2: 000000002c000000 CR3: 00000002228f0000 CR4: 00000000001406f0
> [ 7.381073] Stack:
> [ 7.381796] ffffa9de81277c30 ffffffffad16c562 ffffa9de81277c80
> ffffffffad4eb23e
> [ 7.382557] ffffffffad16c550 ffffffffadfb91b0 ffffa9de811f2da0
> ffffa9de81277ce8
> [ 7.383275] 0000000000000000 ffffffffadc2e7c0 ffffa9de811f46b0
> ffffa9de81277eb0
> [ 7.383986] Call Trace:
> [ 7.384697] [<ffffffffad16c562>] cmp_name+0x12/0x20
> [ 7.385403] [<ffffffffad4eb23e>] bsearch+0x5e/0x90
> [ 7.386188] [<ffffffffad16c550>] ? unregister_module_notifier+0x20/0x20
> [ 7.387304] [<ffffffffad16c6eb>] find_symbol_in_section+0x3b/0xf0
> [ 7.388407] [<ffffffffad16c6b0>] ? mod_find_symname+0x70/0x70
> [ 7.389504] [<ffffffffad16d296>] each_symbol_section+0x26/0x50
> [ 7.390590] [<ffffffffad16d396>] find_symbol+0x36/0xa0
> [ 7.391662] [<ffffffffad16c5b8>] ? find_sec+0x48/0x80
> [ 7.392734] [<ffffffffad16e1ea>] resolve_symbol.isra.61+0x4a/0xb0
> [ 7.393804] [<ffffffffad16d8f6>] ? get_modinfo.isra.56+0x46/0xa0
> [ 7.394880] [<ffffffffad16f777>] load_module+0xc57/0x2700
> [ 7.395948] [<ffffffffad4800b4>] ? ima_post_read_file+0x74/0x90
> [ 7.397015] [<ffffffffad43d6cb>] ? security_kernel_post_read_file+0x6b/0x80
> [ 7.398070] [<ffffffffad27bfd2>] ? kernel_read_file+0x172/0x190
> [ 7.399118] [<ffffffffad171416>] SYSC_finit_module+0x96/0xd0
> [ 7.400169] [<ffffffffad17146e>] SyS_finit_module+0xe/0x10
> [ 7.401205] [<ffffffffada08b64>] entry_SYSCALL_64_fastpath+0x17/0x98
> [ 7.402242] Code: 01 0f b6 4e ff 48 83 c2 01 84 c9 88 4a ff 75 ed
> 5d c3 0f 1f 00 55 48 89 e5 eb 04 84 c0 74 18 48 83 c7 01 48 83 c6 01
> 0f b6 47 ff <3a> 46 ff 74 eb 19 c0 5d 83 c8 01 c3 31 c0 5d c3 66 2e 0f
> 1f 84
> [ 7.403491] RIP [<ffffffffad4dddc6>] strcmp+0x16/0x30
> [ 7.404605] RSP <ffffa9de81277c20>
> [ 7.405706] CR2: 000000002c000000
> [ 7.406815] ---[ end trace 5658e0e68fb01f05 ]---
>
>
> Thanks
> Kui.Z
2016-11-29 03:04-0800, Kui Zhang:
> Looks like my boot issue might be kvm related. System boots fine with
> CONFIG_KVM=m
v4.9-rc6 has some funny changes around modversion, although your bug
looks even more random ...
Can you reproduce with v4.9-rc7 built from a clean repo?
Please send your config if the bug still happens.
Thanks.
> --- .config 2016-11-29 02:41:24.753930839 -0800
> +++ .config.working 2016-11-29 02:41:11.029065291 -0800
> @@ -3544,7 +3544,7 @@
> # CONFIG_IMG_ASCII_LCD is not set
> # CONFIG_UIO is not set
> # CONFIG_VFIO is not set
> -CONFIG_IRQ_BYPASS_MANAGER=y
> +CONFIG_IRQ_BYPASS_MANAGER=m
> # CONFIG_VIRT_DRIVERS is not set
>
> #
> @@ -4553,7 +4553,7 @@
> CONFIG_KVM_COMPAT=y
> CONFIG_HAVE_KVM_IRQ_BYPASS=y
> CONFIG_VIRTUALIZATION=y
> -CONFIG_KVM=y
> +CONFIG_KVM=m
> CONFIG_KVM_INTEL=m
> # CONFIG_KVM_AMD is not set
> # CONFIG_KVM_MMU_AUDIT is not set
>
> On Sun, Nov 27, 2016 at 2:23 PM, Kui Zhang <[email protected]> wrote:
> > Hello,
> >
> > I am having problem booting 4.9.0-rc6+ on my laptop.
> >
> > 4.9.0-rc5+ works, so not likely hardware issues.
> >
> >
> > Ubuntu Zesty Zapus
> >
> > ###
> > gcc-6 with
> >
> > CONFIG_PCI_QUIRKS=y
> > CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS=y
> >
> > After grub, screen turns off. No pre modeset messages. Then system
> > reboot itself.
> >
> > When
> >
> > CONFIG_PCI_QUIRKS not set
> > CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS not set
> >
> >
> > System would boot up to: "Clocksource: Switched to clocksource hpet". then loop
> >
> > '''
> > Could not create tracefs '' directory
> > Could not create directory for event
> > '''
> >
> > ###
> > gcc-4.9 system would panic with above settings on.
> >
> > With them off, setting would boot to login prompt. Only one working terminal.
> >
> > Login works.
> > dmesg works
> >
> > lsmod hangs
> >
> >
> >
> > [ 8.436647] BUG: unable to handle kernel paging request at 0000000016000000
> > [ 8.437448] IP: [<ffffffff974dea56>] strcmp+0x16/0x30
> > [ 8.438224] PGD 0
> >
> > [ 8.438992] Oops: 0000 [#1] SMP
> > [ 8.439750] Modules linked in:
> > [ 8.440506] CPU: 6 PID: 430 Comm: systemd-udevd Not tainted 4.9.0-rc6+ #14
> > [ 8.441266] Hardware name: Notebook
> > P15SM-A/SM1-A /P15SM-A/SM1-A ,
> > BIOS 4.6.5 04/20/2015
> > [ 8.442239] task: ffffa3d3a436e3c0 task.stack: ffffba3641604000
> > [ 8.443033] RIP: 0010:[<ffffffff974dea56>] [<ffffffff974dea56>]
> > strcmp+0x16/0x30
> > [ 8.443828] RSP: 0018:ffffba3641607bf0 EFLAGS: 00010202
> > [ 8.444603] RAX: 000000000000006d RBX: ffffffff97fc33c0 RCX: 0000000000000a1f
> > [ 8.445382] RDX: 000000000000143e RSI: 0000000016000001 RDI: ffffba3641669fe7
> > [ 8.446149] RBP: ffffba3641607bf0 R08: ffffffff9716cb90 R09: ffffffffc0409000
> > [ 8.446917] R10: 00003fffffe00000 R11: 0000000000002000 R12: 0000000000000a1f
> > [ 8.447683] R13: 0000000000000010 R14: 000000000000143e R15: 0000000000000000
> > [ 8.448446] FS: 00007f4830a4c8c0(0000) GS:ffffa3d3afb80000(0000)
> > knlGS:0000000000000000
> > [ 8.449202] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [ 8.449957] CR2: 0000000016000000 CR3: 0000000224a12000 CR4: 00000000001406e0
> > [ 8.450710] Stack:
> > [ 8.451457] ffffba3641607c00 ffffffff9716cba2 ffffba3641607c50
> > ffffffff974ebede
> > [ 8.452232] ffffffff9716cb90 ffffffff97fb91d0 ffffba3641669fe6
> > ffffba3641607cb8
> > [ 8.453005] 0000000000000000 ffffffff97c2e840 ffffba3641687f00
> > ffffba3641607e80
> > [ 8.453779] Call Trace:
> > [ 8.454608] [<ffffffff9716cba2>] cmp_name+0x12/0x20
> > [ 8.455621] [<ffffffff974ebede>] bsearch+0x5e/0x90
> > [ 8.456656] [<ffffffff9716cb90>] ? unregister_module_notifier+0x20/0x20
> > [ 8.457444] [<ffffffff9716cd2b>] find_symbol_in_section+0x3b/0xf0
> > [ 8.458228] [<ffffffff9716ccf0>] ? mod_find_symname+0x70/0x70
> > [ 8.459018] [<ffffffff9716d8d6>] each_symbol_section+0x26/0x50
> > [ 8.459801] [<ffffffff9716d9d6>] find_symbol+0x36/0xa0
> > [ 8.460570] [<ffffffff9716cbf8>] ? find_sec+0x48/0x80
> > [ 8.461553] [<ffffffff9716e82a>] resolve_symbol.isra.61+0x4a/0xb0
> > [ 8.461556] [<ffffffff9716df36>] ? get_modinfo.isra.56+0x46/0xa0
> > [ 8.461558] [<ffffffff9716fdb7>] load_module+0xc57/0x2700
> > [ 8.461560] [<ffffffff97480dc4>] ? ima_post_read_file+0x74/0x90
> > [ 8.461563] [<ffffffff9743e23b>] ? security_kernel_post_read_file+0x6b/0x80
> > [ 8.461566] [<ffffffff9727c7f2>] ? kernel_read_file+0x172/0x190
> > [ 8.461568] [<ffffffff97171a56>] SYSC_finit_module+0x96/0xd0
> > [ 8.461569] [<ffffffff97171aae>] SyS_finit_module+0xe/0x10
> > [ 8.461571] [<ffffffff97002b1a>] do_syscall_64+0x6a/0x220
> > [ 8.461574] [<ffffffff97a0a08a>] entry_SYSCALL64_slow_path+0x25/0x25
> > [ 8.461591] Code: 01 0f b6 4e ff 48 83 c2 01 84 c9 88 4a ff 75 ed
> > 5d c3 0f 1f 00 55 48 89 e5 eb 04 84 c0 74 18 48 83 c7 01 48 83 c6 01
> > 0f b6 47 ff <3a> 46 ff 74 eb 19 c0 5d 83 c8 01 c3 31 c0 5d c3 66 2e 0f
> > 1f 84
> > [ 8.461593] RIP [<ffffffff974dea56>] strcmp+0x16/0x30
> > [ 8.461594] RSP <ffffba3641607bf0>
> > [ 8.461594] CR2: 0000000016000000
> > [ 8.461605] ---[ end trace 470acb4c22b46ca8 ]---
> >
> >
> > [ 7.367754] BUG: unable to handle kernel paging request at 000000002c000000
> > [ 7.368663] IP: [<ffffffffad4dddc6>] strcmp+0x16/0x30
> > [ 7.369408] PGD 0
> >
> > [ 7.370111] Oops: 0000 [#1] SMP
> > [ 7.370805] Modules linked in:
> > [ 7.371504] CPU: 0 PID: 360 Comm: systemd-modules Tainted: G
> > O 4.9.0-rc5 #17
> > [ 7.372211] Hardware name: Notebook
> > P15SM-A/SM1-A /P15SM-A/SM1-A ,
> > BIOS 4.6.5 04/20/2015
> > [ 7.372963] task: ffff8f02659b4740 task.stack: ffffa9de81274000
> > [ 7.373687] RIP: 0010:[<ffffffffad4dddc6>] [<ffffffffad4dddc6>]
> > strcmp+0x16/0x30
> > [ 7.374444] RSP: 0018:ffffa9de81277c20 EFLAGS: 00010202
> > [ 7.375169] RAX: 0000000000000070 RBX: ffffffffadfc3390 RCX: 0000000000000a1e
> > [ 7.375899] RDX: 000000000000143d RSI: 000000002c000001 RDI: ffffa9de811f2da1
> > [ 7.376633] RBP: ffffa9de81277c20 R08: ffffffffad16c550 R09: ffffffffc03ca000
> > [ 7.377364] R10: 00003fffffe00000 R11: 0000000000002000 R12: 0000000000000a1e
> > [ 7.378097] R13: 0000000000000010 R14: 000000000000143d R15: 0000000000000000
> > [ 7.378832] FS: 00007fa5291ef8c0(0000) GS:ffff8f026fa00000(0000)
> > knlGS:0000000000000000
> > [ 7.379591] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [ 7.380327] CR2: 000000002c000000 CR3: 00000002228f0000 CR4: 00000000001406f0
> > [ 7.381073] Stack:
> > [ 7.381796] ffffa9de81277c30 ffffffffad16c562 ffffa9de81277c80
> > ffffffffad4eb23e
> > [ 7.382557] ffffffffad16c550 ffffffffadfb91b0 ffffa9de811f2da0
> > ffffa9de81277ce8
> > [ 7.383275] 0000000000000000 ffffffffadc2e7c0 ffffa9de811f46b0
> > ffffa9de81277eb0
> > [ 7.383986] Call Trace:
> > [ 7.384697] [<ffffffffad16c562>] cmp_name+0x12/0x20
> > [ 7.385403] [<ffffffffad4eb23e>] bsearch+0x5e/0x90
> > [ 7.386188] [<ffffffffad16c550>] ? unregister_module_notifier+0x20/0x20
> > [ 7.387304] [<ffffffffad16c6eb>] find_symbol_in_section+0x3b/0xf0
> > [ 7.388407] [<ffffffffad16c6b0>] ? mod_find_symname+0x70/0x70
> > [ 7.389504] [<ffffffffad16d296>] each_symbol_section+0x26/0x50
> > [ 7.390590] [<ffffffffad16d396>] find_symbol+0x36/0xa0
> > [ 7.391662] [<ffffffffad16c5b8>] ? find_sec+0x48/0x80
> > [ 7.392734] [<ffffffffad16e1ea>] resolve_symbol.isra.61+0x4a/0xb0
> > [ 7.393804] [<ffffffffad16d8f6>] ? get_modinfo.isra.56+0x46/0xa0
> > [ 7.394880] [<ffffffffad16f777>] load_module+0xc57/0x2700
> > [ 7.395948] [<ffffffffad4800b4>] ? ima_post_read_file+0x74/0x90
> > [ 7.397015] [<ffffffffad43d6cb>] ? security_kernel_post_read_file+0x6b/0x80
> > [ 7.398070] [<ffffffffad27bfd2>] ? kernel_read_file+0x172/0x190
> > [ 7.399118] [<ffffffffad171416>] SYSC_finit_module+0x96/0xd0
> > [ 7.400169] [<ffffffffad17146e>] SyS_finit_module+0xe/0x10
> > [ 7.401205] [<ffffffffada08b64>] entry_SYSCALL_64_fastpath+0x17/0x98
> > [ 7.402242] Code: 01 0f b6 4e ff 48 83 c2 01 84 c9 88 4a ff 75 ed
> > 5d c3 0f 1f 00 55 48 89 e5 eb 04 84 c0 74 18 48 83 c7 01 48 83 c6 01
> > 0f b6 47 ff <3a> 46 ff 74 eb 19 c0 5d 83 c8 01 c3 31 c0 5d c3 66 2e 0f
> > 1f 84
> > [ 7.403491] RIP [<ffffffffad4dddc6>] strcmp+0x16/0x30
> > [ 7.404605] RSP <ffffa9de81277c20>
> > [ 7.405706] CR2: 000000002c000000
> > [ 7.406815] ---[ end trace 5658e0e68fb01f05 ]---
> >
> >
> > Thanks
> > Kui.Z
> --
> To unsubscribe from this list: send the line "unsubscribe kvm" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html
Thanks
I was able to reproduce the problem with v4.9-rc7+ (commit
88abd8249ee8bcebb98c90e890ea5e342db832af), after git clean -xdf; make
mrproper
Config attached. Need to set CONFIG_KVM=y to reproduce boot issue.
set CONFIG_KVM=y in menuconfig also set CONFIG_IRQ_BYPASS_MANAGER=y, I
dont see config for CONFIG_IRQ_BYPASS_MANAGER in menuconfig. Since it
is hidden I assumed it might be problem, if I set
CONFIG_IRQ_BYPASS_MANAGER=y in config file... did not try building
with only CONFIG_IRQ_BYPASS_MANAGER=y
Thanks
Kui.Z
On Tue, Nov 29, 2016 at 6:06 AM, Radim Krčmář <[email protected]> wrote:
> 2016-11-29 03:04-0800, Kui Zhang:
>> Looks like my boot issue might be kvm related. System boots fine with
>> CONFIG_KVM=m
>
> v4.9-rc6 has some funny changes around modversion, although your bug
> looks even more random ...
>
> Can you reproduce with v4.9-rc7 built from a clean repo?
> Please send your config if the bug still happens.
>
> Thanks.
>
>> --- .config 2016-11-29 02:41:24.753930839 -0800
>> +++ .config.working 2016-11-29 02:41:11.029065291 -0800
>> @@ -3544,7 +3544,7 @@
>> # CONFIG_IMG_ASCII_LCD is not set
>> # CONFIG_UIO is not set
>> # CONFIG_VFIO is not set
>> -CONFIG_IRQ_BYPASS_MANAGER=y
>> +CONFIG_IRQ_BYPASS_MANAGER=m
>> # CONFIG_VIRT_DRIVERS is not set
>>
>> #
>> @@ -4553,7 +4553,7 @@
>> CONFIG_KVM_COMPAT=y
>> CONFIG_HAVE_KVM_IRQ_BYPASS=y
>> CONFIG_VIRTUALIZATION=y
>> -CONFIG_KVM=y
>> +CONFIG_KVM=m
>> CONFIG_KVM_INTEL=m
>> # CONFIG_KVM_AMD is not set
>> # CONFIG_KVM_MMU_AUDIT is not set
>>
>> On Sun, Nov 27, 2016 at 2:23 PM, Kui Zhang <[email protected]> wrote:
>> > Hello,
>> >
>> > I am having problem booting 4.9.0-rc6+ on my laptop.
>> >
>> > 4.9.0-rc5+ works, so not likely hardware issues.
>> >
>> >
>> > Ubuntu Zesty Zapus
>> >
>> > ###
>> > gcc-6 with
>> >
>> > CONFIG_PCI_QUIRKS=y
>> > CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS=y
>> >
>> > After grub, screen turns off. No pre modeset messages. Then system
>> > reboot itself.
>> >
>> > When
>> >
>> > CONFIG_PCI_QUIRKS not set
>> > CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS not set
>> >
>> >
>> > System would boot up to: "Clocksource: Switched to clocksource hpet". then loop
>> >
>> > '''
>> > Could not create tracefs '' directory
>> > Could not create directory for event
>> > '''
>> >
>> > ###
>> > gcc-4.9 system would panic with above settings on.
>> >
>> > With them off, setting would boot to login prompt. Only one working terminal.
>> >
>> > Login works.
>> > dmesg works
>> >
>> > lsmod hangs
>> >
>> >
>> >
>> > [ 8.436647] BUG: unable to handle kernel paging request at 0000000016000000
>> > [ 8.437448] IP: [<ffffffff974dea56>] strcmp+0x16/0x30
>> > [ 8.438224] PGD 0
>> >
>> > [ 8.438992] Oops: 0000 [#1] SMP
>> > [ 8.439750] Modules linked in:
>> > [ 8.440506] CPU: 6 PID: 430 Comm: systemd-udevd Not tainted 4.9.0-rc6+ #14
>> > [ 8.441266] Hardware name: Notebook
>> > P15SM-A/SM1-A /P15SM-A/SM1-A ,
>> > BIOS 4.6.5 04/20/2015
>> > [ 8.442239] task: ffffa3d3a436e3c0 task.stack: ffffba3641604000
>> > [ 8.443033] RIP: 0010:[<ffffffff974dea56>] [<ffffffff974dea56>]
>> > strcmp+0x16/0x30
>> > [ 8.443828] RSP: 0018:ffffba3641607bf0 EFLAGS: 00010202
>> > [ 8.444603] RAX: 000000000000006d RBX: ffffffff97fc33c0 RCX: 0000000000000a1f
>> > [ 8.445382] RDX: 000000000000143e RSI: 0000000016000001 RDI: ffffba3641669fe7
>> > [ 8.446149] RBP: ffffba3641607bf0 R08: ffffffff9716cb90 R09: ffffffffc0409000
>> > [ 8.446917] R10: 00003fffffe00000 R11: 0000000000002000 R12: 0000000000000a1f
>> > [ 8.447683] R13: 0000000000000010 R14: 000000000000143e R15: 0000000000000000
>> > [ 8.448446] FS: 00007f4830a4c8c0(0000) GS:ffffa3d3afb80000(0000)
>> > knlGS:0000000000000000
>> > [ 8.449202] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> > [ 8.449957] CR2: 0000000016000000 CR3: 0000000224a12000 CR4: 00000000001406e0
>> > [ 8.450710] Stack:
>> > [ 8.451457] ffffba3641607c00 ffffffff9716cba2 ffffba3641607c50
>> > ffffffff974ebede
>> > [ 8.452232] ffffffff9716cb90 ffffffff97fb91d0 ffffba3641669fe6
>> > ffffba3641607cb8
>> > [ 8.453005] 0000000000000000 ffffffff97c2e840 ffffba3641687f00
>> > ffffba3641607e80
>> > [ 8.453779] Call Trace:
>> > [ 8.454608] [<ffffffff9716cba2>] cmp_name+0x12/0x20
>> > [ 8.455621] [<ffffffff974ebede>] bsearch+0x5e/0x90
>> > [ 8.456656] [<ffffffff9716cb90>] ? unregister_module_notifier+0x20/0x20
>> > [ 8.457444] [<ffffffff9716cd2b>] find_symbol_in_section+0x3b/0xf0
>> > [ 8.458228] [<ffffffff9716ccf0>] ? mod_find_symname+0x70/0x70
>> > [ 8.459018] [<ffffffff9716d8d6>] each_symbol_section+0x26/0x50
>> > [ 8.459801] [<ffffffff9716d9d6>] find_symbol+0x36/0xa0
>> > [ 8.460570] [<ffffffff9716cbf8>] ? find_sec+0x48/0x80
>> > [ 8.461553] [<ffffffff9716e82a>] resolve_symbol.isra.61+0x4a/0xb0
>> > [ 8.461556] [<ffffffff9716df36>] ? get_modinfo.isra.56+0x46/0xa0
>> > [ 8.461558] [<ffffffff9716fdb7>] load_module+0xc57/0x2700
>> > [ 8.461560] [<ffffffff97480dc4>] ? ima_post_read_file+0x74/0x90
>> > [ 8.461563] [<ffffffff9743e23b>] ? security_kernel_post_read_file+0x6b/0x80
>> > [ 8.461566] [<ffffffff9727c7f2>] ? kernel_read_file+0x172/0x190
>> > [ 8.461568] [<ffffffff97171a56>] SYSC_finit_module+0x96/0xd0
>> > [ 8.461569] [<ffffffff97171aae>] SyS_finit_module+0xe/0x10
>> > [ 8.461571] [<ffffffff97002b1a>] do_syscall_64+0x6a/0x220
>> > [ 8.461574] [<ffffffff97a0a08a>] entry_SYSCALL64_slow_path+0x25/0x25
>> > [ 8.461591] Code: 01 0f b6 4e ff 48 83 c2 01 84 c9 88 4a ff 75 ed
>> > 5d c3 0f 1f 00 55 48 89 e5 eb 04 84 c0 74 18 48 83 c7 01 48 83 c6 01
>> > 0f b6 47 ff <3a> 46 ff 74 eb 19 c0 5d 83 c8 01 c3 31 c0 5d c3 66 2e 0f
>> > 1f 84
>> > [ 8.461593] RIP [<ffffffff974dea56>] strcmp+0x16/0x30
>> > [ 8.461594] RSP <ffffba3641607bf0>
>> > [ 8.461594] CR2: 0000000016000000
>> > [ 8.461605] ---[ end trace 470acb4c22b46ca8 ]---
>> >
>> >
>> > [ 7.367754] BUG: unable to handle kernel paging request at 000000002c000000
>> > [ 7.368663] IP: [<ffffffffad4dddc6>] strcmp+0x16/0x30
>> > [ 7.369408] PGD 0
>> >
>> > [ 7.370111] Oops: 0000 [#1] SMP
>> > [ 7.370805] Modules linked in:
>> > [ 7.371504] CPU: 0 PID: 360 Comm: systemd-modules Tainted: G
>> > O 4.9.0-rc5 #17
>> > [ 7.372211] Hardware name: Notebook
>> > P15SM-A/SM1-A /P15SM-A/SM1-A ,
>> > BIOS 4.6.5 04/20/2015
>> > [ 7.372963] task: ffff8f02659b4740 task.stack: ffffa9de81274000
>> > [ 7.373687] RIP: 0010:[<ffffffffad4dddc6>] [<ffffffffad4dddc6>]
>> > strcmp+0x16/0x30
>> > [ 7.374444] RSP: 0018:ffffa9de81277c20 EFLAGS: 00010202
>> > [ 7.375169] RAX: 0000000000000070 RBX: ffffffffadfc3390 RCX: 0000000000000a1e
>> > [ 7.375899] RDX: 000000000000143d RSI: 000000002c000001 RDI: ffffa9de811f2da1
>> > [ 7.376633] RBP: ffffa9de81277c20 R08: ffffffffad16c550 R09: ffffffffc03ca000
>> > [ 7.377364] R10: 00003fffffe00000 R11: 0000000000002000 R12: 0000000000000a1e
>> > [ 7.378097] R13: 0000000000000010 R14: 000000000000143d R15: 0000000000000000
>> > [ 7.378832] FS: 00007fa5291ef8c0(0000) GS:ffff8f026fa00000(0000)
>> > knlGS:0000000000000000
>> > [ 7.379591] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> > [ 7.380327] CR2: 000000002c000000 CR3: 00000002228f0000 CR4: 00000000001406f0
>> > [ 7.381073] Stack:
>> > [ 7.381796] ffffa9de81277c30 ffffffffad16c562 ffffa9de81277c80
>> > ffffffffad4eb23e
>> > [ 7.382557] ffffffffad16c550 ffffffffadfb91b0 ffffa9de811f2da0
>> > ffffa9de81277ce8
>> > [ 7.383275] 0000000000000000 ffffffffadc2e7c0 ffffa9de811f46b0
>> > ffffa9de81277eb0
>> > [ 7.383986] Call Trace:
>> > [ 7.384697] [<ffffffffad16c562>] cmp_name+0x12/0x20
>> > [ 7.385403] [<ffffffffad4eb23e>] bsearch+0x5e/0x90
>> > [ 7.386188] [<ffffffffad16c550>] ? unregister_module_notifier+0x20/0x20
>> > [ 7.387304] [<ffffffffad16c6eb>] find_symbol_in_section+0x3b/0xf0
>> > [ 7.388407] [<ffffffffad16c6b0>] ? mod_find_symname+0x70/0x70
>> > [ 7.389504] [<ffffffffad16d296>] each_symbol_section+0x26/0x50
>> > [ 7.390590] [<ffffffffad16d396>] find_symbol+0x36/0xa0
>> > [ 7.391662] [<ffffffffad16c5b8>] ? find_sec+0x48/0x80
>> > [ 7.392734] [<ffffffffad16e1ea>] resolve_symbol.isra.61+0x4a/0xb0
>> > [ 7.393804] [<ffffffffad16d8f6>] ? get_modinfo.isra.56+0x46/0xa0
>> > [ 7.394880] [<ffffffffad16f777>] load_module+0xc57/0x2700
>> > [ 7.395948] [<ffffffffad4800b4>] ? ima_post_read_file+0x74/0x90
>> > [ 7.397015] [<ffffffffad43d6cb>] ? security_kernel_post_read_file+0x6b/0x80
>> > [ 7.398070] [<ffffffffad27bfd2>] ? kernel_read_file+0x172/0x190
>> > [ 7.399118] [<ffffffffad171416>] SYSC_finit_module+0x96/0xd0
>> > [ 7.400169] [<ffffffffad17146e>] SyS_finit_module+0xe/0x10
>> > [ 7.401205] [<ffffffffada08b64>] entry_SYSCALL_64_fastpath+0x17/0x98
>> > [ 7.402242] Code: 01 0f b6 4e ff 48 83 c2 01 84 c9 88 4a ff 75 ed
>> > 5d c3 0f 1f 00 55 48 89 e5 eb 04 84 c0 74 18 48 83 c7 01 48 83 c6 01
>> > 0f b6 47 ff <3a> 46 ff 74 eb 19 c0 5d 83 c8 01 c3 31 c0 5d c3 66 2e 0f
>> > 1f 84
>> > [ 7.403491] RIP [<ffffffffad4dddc6>] strcmp+0x16/0x30
>> > [ 7.404605] RSP <ffffa9de81277c20>
>> > [ 7.405706] CR2: 000000002c000000
>> > [ 7.406815] ---[ end trace 5658e0e68fb01f05 ]---
>> >
>> >
>> > Thanks
>> > Kui.Z
>> --
>> To unsubscribe from this list: send the line "unsubscribe kvm" in
>> the body of a message to [email protected]
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
2016-11-29 09:04-0800, Kui Zhang:
> Config attached.
Not here; needs Mr. Clippy to hold in place.
Sorry Mr. Clippy, I failed you.
this result seem to result same panic
+CONFIG_CFG80211=y
On Wed, Nov 30, 2016 at 9:06 AM, Radim Krčmář <[email protected]> wrote:
> 2016-11-29 09:04-0800, Kui Zhang:
>> Config attached.
>
> Not here; needs Mr. Clippy to hold in place.
2016-11-30 14:20-0800, Kui Zhang:
> this result seem to result same panic
> +CONFIG_CFG80211=y
I still can't reproduce, sorry, and the attached panic is yet another
thing ... you mentioned that it regressed between v4.9-rc5 and v4.9-rc7;
please run git bisect on it.
Hello,
I can confirm certain wireless networks cause hangs (stalls - mostly
swapper/n). This only happens with one network here, others are fine. I
tried to bisect it but never came to an presentable result.
Greetings,
Tobias
On 01.12.2016 17:10, Radim Krčmář wrote:
> 2016-11-30 14:20-0800, Kui Zhang:
>> this result seem to result same panic
>> +CONFIG_CFG80211=y
> I still can't reproduce, sorry, and the attached panic is yet another
> thing ... you mentioned that it regressed between v4.9-rc5 and v4.9-rc7;
> please run git bisect on it.