Re: [patch 07/54] mm/slub: use stackdepot to save stack trace in objects

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This somewhat unexpectedly causes a crash when running the xfs/433 test
in xfstests for me.  Reverting the commit fixes the problem:

xfs/433 files ... [  138.422742] run fstests xfs/433 at 2021-07-16 07:30:42
[  140.128145] XFS (vdb): Mounting V5 Filesystem
[  140.160450] XFS (vdb): Ending clean mount
[  140.171782] xfs filesystem being mounted at /mnt/test supports timestamps un)
[  140.966560] XFS (vdc): Mounting V5 Filesystem
[  140.987911] XFS (vdc): Ending clean mount
[  141.000104] xfs filesystem being mounted at /mnt/scratch supports timestamps)
[  145.130156] XFS (vdc): Unmounting Filesystem
[  145.365230] XFS (vdc): Mounting V5 Filesystem
[  145.394542] XFS (vdc): Ending clean mount
[  145.409232] xfs filesystem being mounted at /mnt/scratch supports timestamps)
[  145.471384] XFS (vdc): Injecting error (false) at file fs/xfs/xfs_buf.c, lin"
[  145.478561] XFS (vdc): Injecting error (false) at file fs/xfs/xfs_buf.c, lin"
[  145.486070] XFS (vdc): Injecting error (false) at file fs/xfs/xfs_buf.c, lin"
[  145.492248] XFS (vdc): Injecting error (false) at file fs/xfs/xfs_buf.c, lin"
[  145.599964] XFS (vdb): Unmounting Filesystem
[  145.958340] BUG: kernel NULL pointer dereference, address: 0000000000000020
[  145.961760] #PF: supervisor read access in kernel mode
[  145.964278] #PF: error_code(0x0000) - not-present page
[  145.966758] PGD 0 P4D 0 
[  145.968041] Oops: 0000 [#1] PREEMPT SMP PTI
[  145.970077] CPU: 3 PID: 14172 Comm: xfs_scrub Not tainted 5.13.0+ #601
[  145.973243] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.144
[  145.977312] RIP: 0010:xfs_inode_hasattr+0x19/0x30
[  145.979626] Code: 83 c6 05 b2 55 75 02 01 e8 39 40 e4 00 eb b6 66 90 31 c0 80
[  145.989446] RSP: 0018:ffffc900070eba08 EFLAGS: 00010206
[  145.992280] RAX: ffffffff00ff0000 RBX: 0000000000000000 RCX: 0000000000000001
[  145.995970] RDX: 0000000000000000 RSI: ffffffff82fdd33f RDI: ffff88810dbe16c0
[  145.999945] RBP: ffff88810dbe16c0 R08: ffff888110e14348 R09: ffff888110e14348
[  146.003932] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
[  146.007854] R13: ffff888110d99000 R14: ffff888110d99000 R15: ffffffff834acd60
[  146.011765] FS:  00007f2bf29d7700(0000) GS:ffff88813bd80000(0000) knlGS:00000
[  146.016127] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  146.019297] CR2: 0000000000000020 CR3: 0000000110c96000 CR4: 00000000000006e0
[  146.023315] Call Trace:
[  146.024726]  xfs_attr_inactive+0x152/0x350
[  146.027059]  xfs_inactive+0x18a/0x240
[  146.029141]  xfs_fs_destroy_inode+0xcc/0x2d0
[  146.031311]  destroy_inode+0x36/0x70
[  146.033130]  xfs_bulkstat_one_int+0x243/0x340
[  146.035342]  xfs_bulkstat_iwalk+0x19/0x30
[  146.037562]  xfs_iwalk_ag_recs+0xef/0x1e0
[  146.039845]  xfs_iwalk_run_callbacks+0x9f/0x140
[  146.042550]  xfs_iwalk_ag+0x230/0x2f0
[  146.044601]  xfs_iwalk+0x139/0x200
[  146.046505]  ? xfs_bulkstat_one_int+0x340/0x340
[  146.049151]  xfs_bulkstat+0xc4/0x130
[  146.050771]  ? xfs_flags2diflags+0xe0/0xe0
[  146.052309]  xfs_ioc_bulkstat.constprop.0.isra.0+0xbf/0x120
[  146.054200]  xfs_file_ioctl+0xb6/0xef0
[  146.055474]  ? lock_is_held_type+0xd5/0x130
[  146.056867]  ? find_held_lock+0x2b/0x80
[  146.058241]  ? lock_release+0x13c/0x2e0
[  146.059385]  ? lock_is_held_type+0xd5/0x130
[  146.060435]  ? __fget_files+0xce/0x1d0
[  146.061385]  __x64_sys_ioctl+0x7e/0xb0
[  146.062333]  do_syscall_64+0x3b/0x90
[  146.063284]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[  146.064572] RIP: 0033:0x7f2bf2df5427
[  146.065600] Code: 00 00 90 48 8b 05 69 aa 0c 00 64 c7 00 26 00 00 00 48 c7 c8
[  146.070244] RSP: 002b:00007f2bf29d6bd8 EFLAGS: 00000246 ORIG_RAX: 00000000000
[  146.072015] RAX: ffffffffffffffda RBX: 00007fffe44b8010 RCX: 00007f2bf2df5427
[  146.073692] RDX: 00007f2be4000b20 RSI: 000000008040587f RDI: 0000000000000003
[  146.075322] RBP: 00007f2be4000b20 R08: 00007f2be4003b70 R09: 0000000000000077
[  146.076962] R10: 0000000000000001 R11: 0000000000000246 R12: 00007f2be4003b70
[  146.078480] R13: 00007fffe44b8010 R14: 00007f2be4000b60 R15: 0000000000000018
[  146.079803] Modules linked in:
[  146.080379] CR2: 0000000000000020
[  146.081196] ---[ end trace 80a6ea90b0ea2a03 ]---
[  146.082130] RIP: 0010:xfs_inode_hasattr+0x19/0x30
[  146.083144] Code: 83 c6 05 b2 55 75 02 01 e8 39 40 e4 00 eb b6 66 90 31 c0 80
[  146.086831] RSP: 0018:ffffc900070eba08 EFLAGS: 00010206
[  146.087816] RAX: ffffffff00ff0000 RBX: 0000000000000000 RCX: 0000000000000001
[  146.089122] RDX: 0000000000000000 RSI: ffffffff82fdd33f RDI: ffff88810dbe16c0
[  146.090477] RBP: ffff88810dbe16c0 R08: ffff888110e14348 R09: ffff888110e14348
[  146.091794] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
[  146.093096] R13: ffff888110d99000 R14: ffff888110d99000 R15: ffffffff834acd60
[  146.094429] FS:  00007f2bf29d7700(0000) GS:ffff88813bd80000(0000) knlGS:00000
[  146.096002] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  146.097079] CR2: 0000000000000020 CR3: 0000000110c96000 CR4: 00000000000006e0
[  146.098479] Kernel panic - not syncing: Fatal exception
[  146.099677] Kernel Offset: disabled
[  146.100397] ---[ end Kernel panic - not syncing: Fatal exception ]---






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