On Mon, Sep 10, 2018 at 09:08:36AM -0700, Tony Lindgren wrote:
> * David Howells <dhowells@xxxxxxxxxx> [180908 15:28]:
> > Tony Lindgren <tony@xxxxxxxxxxx> wrote:
> >
> > > > > Looks like next-20180906 now has a regression where mounting
> > > > > root won't work with commit fd0002870b45 ("vfs: Implement a
> > > > > filesystem superblock creation/configuration context").
> > > >
> > > > Am I right in thinking you're not using any of the LSMs?
> > >
> > > Assuming LSM as in Documentation/lsm.txt, right not using any.
> >
> > The default return value for security_fs_context_parse_param() should be
> > -ENOPARAM, both in security.h and security.c.
> >
> > I've fixed my tree and Al has pulled it, but we're now waiting on Stephen
> > Rothwell to refresh linux/next.
>
> OK thanks for tracking that down, next-20180910 boots again
> for me.
>
Did you try to shutdown and/or reboot ?
You might see something like the attached if you try.
Guenter
---
Unable to handle kernel paging request at virtual address 0000000000000030
umount(92): Oops 0
pc = [<fffffc000041200c>] ra = [<fffffc00004121cc>] ps = 0000 Not tainted
pc is at reconfigure_super+0x7c/0x2c0
ra is at reconfigure_super+0x23c/0x2c0
v0 = 0000000000000000 t0 = 0000000000000000 t1 = fffffc000743c030
t2 = fffffc000743c0a0 t3 = 0000000000000020 t4 = fffffffffffffdff
t5 = 0000000000000200 t6 = fffffc0000b9d9f8 t7 = fffffc000749c000
s0 = fffffc000743c000 s1 = fffffc000749fe08 s2 = 0000000000000000
s3 = 0000000000000001 s4 = 0000000120114ba0 s5 = fffffc0007027220
s6 = 0000000000000000
a0 = fffffc000743c000 a1 = fffffc00070072a0 a2 = fffffc00074e4b80
a3 = fffffc000743c800 a4 = 0000000000000001 a5 = fffffc000040ed50
t8 = 0000000000000001 t9 = 000000000abd5213 t10= 000000000748c000
t11= 0000000000000100 pv = fffffc0000439300 at = 0000000000000000
gp = fffffc0000b8d9f8 sp = (____ptrval____)
Disabling lock debugging due to kernel taint
Trace:
[<fffffc0000437d1c>] do_umount_root+0x9c/0xe0
[<fffffc000043a0d8>] ksys_umount+0x308/0x510
[<fffffc000043a2fc>] sys_umount+0x1c/0x30
[<fffffc00003115d4>] entSys+0xa4/0xc0
---
[ 10.059677] BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
[ 10.060205] PGD 800000000e37b067 P4D 800000000e37b067 PUD e37c067 PMD 0
[ 10.060960] Oops: 0000 [#1] SMP PTI
[ 10.061405] CPU: 0 PID: 1210 Comm: umount Not tainted 4.19.0-rc2-next-20180910 #1
[ 10.061727] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.11.2-0-gf9626ccb91-prebuilt.qemu-project.org 04/01/2014
[ 10.062946] RIP: 0010:reconfigure_super+0x47/0x210
[ 10.063363] Code: d4 01 00 00 44 8b a3 30 02 00 00 45 85 e4 0f 85 9d 01 00 00 a8 01 48 89 fd 75 4f 48 89 df 45 31 ed e8 ad 4f 01 00 48 8b 45 00 <48> 8b 40 30 48 85 c0 0f 84 d3 00 00 00 48 89 ef ff d0 85 c0 0f 84
[ 10.064016] RSP: 0018:ffffbdc240123dd0 EFLAGS: 00000246
[ 10.064273] RAX: 0000000000000000 RBX: ffffa13b8e310000 RCX: ffffa13b8e3100b8
[ 10.064540] RDX: ffffa13b8e310048 RSI: 0000000000000000 RDI: ffffffff99949e28
[ 10.064806] RBP: ffffbdc240123e00 R08: 0000000000000179 R09: 0000000000000000
[ 10.066145] R10: ffffbdc2400bfd08 R11: 0000000000000001 R12: 0000000000000000
[ 10.066432] R13: 0000000000000001 R14: ffffa13b8f370920 R15: 0000000000000000
[ 10.066781] FS: 00007fd7ce876500(0000) GS:ffffa13b8f600000(0000) knlGS:0000000000000000
[ 10.067107] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 10.067341] CR2: 0000000000000030 CR3: 000000000e3a6000 CR4: 00000000003406f0
[ 10.067730] Call Trace:
[ 10.068888] do_umount_root+0x7b/0xb0
[ 10.069157] ksys_umount+0x250/0x3e0
[ 10.069352] ? vfs_write+0x13f/0x190
[ 10.069538] __x64_sys_umount+0xd/0x10
[ 10.069742] do_syscall_64+0x39/0xe0
[ 10.069962] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 10.070419] RIP: 0033:0x7fd7ce395b47
[ 10.070605] Code: 73 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 11 73 2b 00 f7 d8 64 89 01 48
[ 10.071220] RSP: 002b:00007ffea2a29288 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
[ 10.071552] RAX: ffffffffffffffda RBX: 00000000011fa8e0 RCX: 00007fd7ce395b47
[ 10.071796] RDX: 00007ffea2a29470 RSI: 0000000000000000 RDI: 00000000011fa8e0
[ 10.072038] RBP: 00000000011fab40 R08: 00000000011fa920 R09: 00007fd7ce3d36c0
[ 10.072291] R10: 000000000000089e R11: 0000000000000206 R12: 00000000011fa8a0
[ 10.072543] R13: 00000000011faba0 R14: 0000000000000000 R15: 00007ffea2a29470
[ 10.072933] Modules linked in:
[ 10.073321] CR2: 0000000000000030
[ 10.073869] ---[ end trace 9ae171053580f03c ]---
[ 10.074155] RIP: 0010:reconfigure_super+0x47/0x210
[ 10.074366] Code: d4 01 00 00 44 8b a3 30 02 00 00 45 85 e4 0f 85 9d 01 00 00 a8 01 48 89 fd 75 4f 48 89 df 45 31 ed e8 ad 4f 01 00 48 8b 45 00 <48> 8b 40 30 48 85 c0 0f 84 d3 00 00 00 48 89 ef ff d0 85 c0 0f 84
[ 10.074977] RSP: 0018:ffffbdc240123dd0 EFLAGS: 00000246
[ 10.075182] RAX: 0000000000000000 RBX: ffffa13b8e310000 RCX: ffffa13b8e3100b8
[ 10.075425] RDX: ffffa13b8e310048 RSI: 0000000000000000 RDI: ffffffff99949e28
[ 10.075672] RBP: ffffbdc240123e00 R08: 0000000000000179 R09: 0000000000000000
[ 10.075919] R10: ffffbdc2400bfd08 R11: 0000000000000001 R12: 0000000000000000
[ 10.076167] R13: 0000000000000001 R14: ffffa13b8f370920 R15: 0000000000000000
[ 10.076421] FS: 00007fd7ce876500(0000) GS:ffffa13b8f600000(0000) knlGS:0000000000000000
[ 10.076735] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 10.076955] CR2: 0000000000000030 CR3: 000000000e3a6000 CR4: 00000000003406f0
