linux-kernel - qemu sparc64 runtime crashes in -next

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Date:   Wed, 14 Jun 2017 03:13:54 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Pavel Tatashin <pasha.tatashin@...cle.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Bob Picco <bob.picco@...cle.com>,
        Steven Sistare <steven.sistare@...cle.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: qemu sparc64 runtime crashes in -next

Hi,

my sparc qemu tests started failing with next-20170613.
Log output is not very helpful:

Unhandled Exception 0x0000000000000028
PC = 0x00000000004620f4 NPC = 0x00000000004620f8
Stopping execution

It looks like 0x00000000004620f4 is in init_tick_ops().

Bisect points to commit 'sparc64: improve modularity tick options'.
Bisect log is attached.

No idea if this is a qemu problem. If you think it is, anything to help
tracking it down would be appreciated.

Thanks,
Guenter

---
# bad: [b14746170b0684005bab3e07893e6b91baf7dbf6] Add linux-next specific files for 20170614
# good: [32c1431eea4881a6b17bd7c639315010aeefa452] Linux 4.12-rc5
git bisect start 'HEAD' 'v4.12-rc5'
# bad: [0500b956eedb4686b0420308ae01a74b00f9ab64] Merge remote-tracking branch 'crypto/master'
git bisect bad 0500b956eedb4686b0420308ae01a74b00f9ab64
# bad: [411b0d31eb697ad647513baf4d109bfec102d88d] Merge remote-tracking branch 'jc_docs/docs-next'
git bisect bad 411b0d31eb697ad647513baf4d109bfec102d88d
# good: [17ea634b46f1ed3e6e7910ed9de81bdc27c472a1] Merge remote-tracking branch 'sunxi/sunxi/for-next'
git bisect good 17ea634b46f1ed3e6e7910ed9de81bdc27c472a1
# bad: [2a0cc43ce1f9d76cf438855fd0e526cdb277a5a9] Merge remote-tracking branch 'btrfs-kdave/for-next'
git bisect bad 2a0cc43ce1f9d76cf438855fd0e526cdb277a5a9
# good: [09c98ed29a43211c59b986ac6190695aaacfa220] Merge remote-tracking branch 'powerpc/next'
git bisect good 09c98ed29a43211c59b986ac6190695aaacfa220
# good: [34e4c9c048aa3ed9b13f357bc15ad4870fc6f2ae] Merge branch 'ext/syue/dir-item-checks-wip' into for-next-next-v4.13-20170605
git bisect good 34e4c9c048aa3ed9b13f357bc15ad4870fc6f2ae
# good: [bb3cc9791ff3a10bb214585cbe9a6d8713e1ba7d] Merge remote-tracking branch 's390/features'
git bisect good bb3cc9791ff3a10bb214585cbe9a6d8713e1ba7d
# bad: [169ca4894ea4b491d95d9cfe7350eceb08f72243] Merge remote-tracking branch 'tile/master'
git bisect bad 169ca4894ea4b491d95d9cfe7350eceb08f72243
# good: [0abdfaf4a95435c0197603a262149019ca2f448d] Merge branch 'sparc64-LDC-changes-for-porting-VCC-driver-into-upstream-kernel'
git bisect good 0abdfaf4a95435c0197603a262149019ca2f448d
# bad: [4929c83a6ce6584cb64381bf1407c487f67d588a] sparc64: add hot-patched and inlined get_tick()
git bisect bad 4929c83a6ce6584cb64381bf1407c487f67d588a
# good: [b5dd4d807f0fe7da67c5cc67b2ec681b60e4994b] sparc64: show time stamps from zero
git bisect good b5dd4d807f0fe7da67c5cc67b2ec681b60e4994b
# bad: [89108c3423e8047cd0da73182ea09b9da190b57e] sparc64: improve modularity tick options
git bisect bad 89108c3423e8047cd0da73182ea09b9da190b57e
# good: [178bf2b9a20e866677bbca5cb521b09a8498c1d7] sparc64: optimize loads in clock_sched()
git bisect good 178bf2b9a20e866677bbca5cb521b09a8498c1d7
# first bad commit: [89108c3423e8047cd0da73182ea09b9da190b57e] sparc64: improve modularity tick options