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SubjectRe: bisected bd4c82c22c367e is the first bad commit (was [Bug 198617] New: zswap causing random applications to crash)
On (02/05/18 20:00), Huang, Ying wrote:
[..]
> I have successfully reproduced the issue and find the problem. The
> following patch fix the issue for me, can you try it?

That was quick ;)

> ---------------------------------8<-------------------------------
> From 4c52d531680f91572ebc6f4525a018e32a934ef0 Mon Sep 17 00:00:00 2001
> From: Huang Ying <huang.ying.caritas@gmail.com>
> Date: Mon, 5 Feb 2018 19:27:43 +0800
> Subject: [PATCH] fontswap thp fix

Seems to be fixing the problem on my x86 box. Executed several tests, no
crashes were observed. Can run more tests tomorrow.


============================================================================

Probably unrelated, but may be it is related: my X server used to hang
sometimes (rarely) which I suspect was/is caused by nouveau driver. It,
surprisingly, didn't hang this time around. Nouveau spitted a number
of backtraces, but X server managed to survive it. Any chance that
nouveau-X server thing was caused by THP?


[ 308.986648] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152 bytes)
[ 308.986653] nouveau 0000:01:00.0: swiotlb: coherent allocation failed, size=2097152
[ 308.986657] CPU: 5 PID: 343 Comm: Xorg Not tainted 4.15.0-next-20180205-dbg-00021-ga1282bf979c4-dirty #2480
[ 308.986659] Call Trace:
[ 308.986667] dump_stack+0x46/0x59
[ 308.986671] swiotlb_alloc_coherent+0x164/0x174
[ 308.986675] ttm_dma_pool_get_pages+0x16e/0x3ce
[ 308.986679] ttm_dma_populate+0x108/0x2af
[ 308.986681] ttm_tt_bind+0x32/0x57
[ 308.986684] ttm_bo_handle_move_mem+0x120/0x328
[ 308.986687] ? ttm_bo_mem_space+0x170/0x3a0
[ 308.986690] ttm_bo_validate+0x7b/0xd9
[ 308.986694] ? __mutex_trylock_or_owner+0x43/0x54
[ 308.986697] ttm_bo_init_reserved+0x31f/0x38a
[ 308.986700] ttm_bo_init+0x52/0x76
[ 308.986703] ? nouveau_bo_invalidate_caches+0x8/0x8
[ 308.986706] nouveau_bo_new+0x4a8/0x4c7
[ 308.986709] ? nouveau_bo_invalidate_caches+0x8/0x8
[ 308.986712] nouveau_gem_new+0x49/0xcc
[ 308.986715] nouveau_gem_ioctl_new+0x3e/0x9f
[ 308.986717] ? nouveau_gem_new+0xcc/0xcc
[ 308.986720] drm_ioctl_kernel+0x64/0xa0
[ 308.986723] drm_ioctl+0x1d6/0x2a8
[ 308.986725] ? nouveau_gem_new+0xcc/0xcc
[ 308.986729] ? _raw_spin_unlock_irq+0x13/0x24
[ 308.986732] ? free_swap_slot+0xad/0xc2
[ 308.986735] nouveau_drm_ioctl+0x71/0xa4
[ 308.986738] vfs_ioctl+0x1e/0x2b
[ 308.986741] do_vfs_ioctl+0x505/0x518
[ 308.986745] ? __fget+0x5d/0x67
[ 308.986747] SyS_ioctl+0x3e/0x5a
[ 308.986751] do_syscall_64+0x17f/0x196
[ 308.986754] entry_SYSCALL_64_after_hwframe+0x21/0x86
[ 308.986757] RIP: 0033:0x7f0395218d87
[ 308.986759] RSP: 002b:00007ffc210c4c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 308.986761] RAX: ffffffffffffffda RBX: 000056213e828350 RCX: 00007f0395218d87
[ 308.986764] RDX: 00007ffc210c4ca0 RSI: 00000000c0306480 RDI: 000000000000000b
[ 308.986765] RBP: 00007ffc210c4ca0 R08: 0000000000000004 R09: 0000000000000006
[ 308.986767] R10: 000056213e320010 R11: 0000000000000246 R12: 00000000c0306480
[ 308.986769] R13: 000000000000000b R14: 00007ffc210c4d60 R15: 000056213e35e770
[ 309.264408] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152 bytes)
[ 309.264412] nouveau 0000:01:00.0: swiotlb: coherent allocation failed, size=2097152
[ 309.264416] CPU: 4 PID: 343 Comm: Xorg Not tainted 4.15.0-next-20180205-dbg-00021-ga1282bf979c4-dirty #2480
[ 309.264418] Call Trace:
[ 309.264425] dump_stack+0x46/0x59
[ 309.264429] swiotlb_alloc_coherent+0x164/0x174
[ 309.264434] ttm_dma_pool_get_pages+0x16e/0x3ce
[ 309.264437] ttm_dma_populate+0x108/0x2af
[ 309.264440] ttm_tt_bind+0x32/0x57
[ 309.264442] ttm_bo_handle_move_mem+0x120/0x328
[ 309.264445] ? ttm_bo_mem_space+0x170/0x3a0
[ 309.264448] ttm_bo_validate+0x7b/0xd9
[ 309.264452] ? __mutex_trylock_or_owner+0x43/0x54
[ 309.264454] ttm_bo_init_reserved+0x31f/0x38a
[ 309.264457] ttm_bo_init+0x52/0x76
[ 309.264461] ? nouveau_bo_invalidate_caches+0x8/0x8
[ 309.264463] nouveau_bo_new+0x4a8/0x4c7
[ 309.264466] ? nouveau_bo_invalidate_caches+0x8/0x8
[ 309.264469] nouveau_gem_new+0x49/0xcc
[ 309.264471] nouveau_gem_ioctl_new+0x3e/0x9f
[ 309.264474] ? nouveau_gem_new+0xcc/0xcc
[ 309.264477] drm_ioctl_kernel+0x64/0xa0
[ 309.264479] drm_ioctl+0x1d6/0x2a8
[ 309.264482] ? nouveau_gem_new+0xcc/0xcc
[ 309.264485] nouveau_drm_ioctl+0x71/0xa4
[ 309.264489] vfs_ioctl+0x1e/0x2b
[ 309.264491] do_vfs_ioctl+0x505/0x518
[ 309.264495] ? __fget+0x5d/0x67
[ 309.264497] SyS_ioctl+0x3e/0x5a
[ 309.264500] do_syscall_64+0x17f/0x196
[ 309.264504] entry_SYSCALL_64_after_hwframe+0x21/0x86
[ 309.264506] RIP: 0033:0x7f0395218d87
[ 309.264508] RSP: 002b:00007ffc210c4c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 309.264511] RAX: ffffffffffffffda RBX: 000056213e828350 RCX: 00007f0395218d87
[ 309.264513] RDX: 00007ffc210c4ca0 RSI: 00000000c0306480 RDI: 000000000000000b
[ 309.264515] RBP: 00007ffc210c4ca0 R08: 0000000000000004 R09: 00007f03954ddad0
[ 309.264517] R10: 00007f03913786a1 R11: 0000000000000246 R12: 00000000c0306480
[ 309.264518] R13: 000000000000000b R14: 00007ffc210c4d60 R15: 000056213e35e770

-ss

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