On Wed, Jul 17, 2019 at 03:04:56PM -0700, Linus Torvalds wrote:

On Wed, Jul 17, 2019 at 2:59 PM Dmitry V. Levin [off-list ref] wrote:

quoted

So this ended up as commit 7b9afb86b6328f10dc2cad9223d7def12d60e505
(thanks to Anatoly for bisecting) and introduced a regression:
futex.test from the strace test suite now causes an Oops on sparc64
in futex syscall.

Can you post the oops here in the same thread too? Maybe it's already
posted somewhere else, but I can't seem to find anything likely on
lkml at least..

Sure, here it is:

[  514.137217] Unable to handle kernel paging request at virtual address 00060000541d0000
[  514.137295] tsk->{mm,active_mm}->context = 00000000000005b2
[  514.137343] tsk->{mm,active_mm}->pgd = fff80024955a2000
[  514.137387]               \|/ ____ \|/
                             "@'/ .. \`@"
                             /_| \__/ |_\
                                \__U_/
[  514.137493] futex(1599): Oops [#1]
[  514.137533] CPU: 26 PID: 1599 Comm: futex Not tainted 5.2.0-05721-gd3649f68b433 #1096
[  514.137595] TSTATE: 0000000011001603 TPC: 000000000051adc4 TNPC: 000000000051adc8 Y: 00000000    Not tainted
[  514.137678] TPC: <get_futex_key+0xe4/0x6a0>
[  514.137712] g0: 0000000000000000 g1: 0000000000e75178 g2: 000000000009a21d g3: 0000000000000000
[  514.137769] g4: fff8002474fbc0e0 g5: fff80024aa80c000 g6: fff8002495aec000 g7: 0000000000000200
[  514.137825] o0: 0000000000000001 o1: 0000000000000001 o2: 0000000000000000 o3: fff8002495aefa28
[  514.137882] o4: fff8000100030000 o5: fff800010002e000 sp: fff8002495aef161 ret_pc: 000000000051ada4
[  514.137944] RPC: <get_futex_key+0xc4/0x6a0>
[  514.137978] l0: 000000000051b144 l1: 0000000000000001 l2: 0000000000c01950 l3: fff80024626051c0
[  514.138036] l4: 0000000000c01970 l5: 0000000000cf6800 l6: 00060000541d13f0 l7: 00000000014b3000
[  514.138094] i0: 0000000000000001 i1: 000000000051af30 i2: fff8002495aefc28 i3: 0000000000000001
[  514.138152] i4: 0000000000cf69b0 i5: fff800010002e000 i6: fff8002495aef231 i7: 000000000051b3a8
[  514.138211] I7: <futex_wait_setup+0x28/0x120>
[  514.138245] Call Trace:
[  514.138271]  [000000000051b3a8] futex_wait_setup+0x28/0x120
[  514.138313]  [000000000051b550] futex_wait+0xb0/0x200
[  514.138352]  [000000000051d734] do_futex+0xd4/0xc00
[  514.138390]  [000000000051e384] sys_futex+0x124/0x140
[  514.138435]  [0000000000406294] linux_sparc_syscall+0x34/0x44
[  514.138478] Disabling lock debugging due to kernel taint
[  514.138501] Caller[000000000051b3a8]: futex_wait_setup+0x28/0x120
[  514.138524] Caller[000000000051b550]: futex_wait+0xb0/0x200
[  514.138547] Caller[000000000051d734]: do_futex+0xd4/0xc00
[  514.138568] Caller[000000000051e384]: sys_futex+0x124/0x140
[  514.138590] Caller[0000000000406294]: linux_sparc_syscall+0x34/0x44
[  514.138614] Caller[0000010000000e90]: 0x10000000e90
[  514.138633] Instruction DUMP:
[  514.138635]  0640016e 
[  514.138650]  b13da000 
[  514.138663]  ec5fa7f7 
[  514.138676] <c25da008>
[  514.138689]  ae100016 
[  514.138702]  84086001 
[  514.138714]  82007fff 
[  514.138727]  af789401 
[  514.138740]  f05de018 


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ldv