kernel BUG at fs/btrfs/relocation.c:4498!

kernel BUG at fs/btrfs/relocation.c:4498!

[Christopher Baines]

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Hi,

I seem to have run in to some problems when trying to swap two new disks
for two old disks in a RAID 1 array. It currently looks like:

Label: none  uuid: f47f0803-0bdb-4152-93b6-c4719c64d459
        Total devices 6 FS bytes used 19.82TiB
        devid    1 size 5.46TiB used 5.46TiB path /dev/sdc1
        devid    2 size 5.46TiB used 5.46TiB path /dev/sde1
        devid    3 size 10.91TiB used 10.91TiB path /dev/sdf1
        devid    4 size 18.19TiB used 18.19TiB path /dev/sdd1
        devid    5 size 18.19TiB used 2.09GiB path /dev/sda1
        devid    6 size 18.19TiB used 4.84GiB path /dev/sdb1

I added the two new disks /dev/sda1 and /dev/sdb1, but then got errors
when trying to remove the two old disks /dev/sdc1 and /dev/sde1. I can't
figure out if the "parent transid verify failed" are recoverable from,
so I'm now trying to remove the two new disks so I can create a new
filesystem and copy the data over.

I can't seem to remove the two new disks though, the following command
segfaults:

btrfs device remove /dev/sda1 /dev/sdb1 /var/lib/nars
Segmentation fault


I see the following in /var/log/messages, any ideas?

Sep 20 10:14:29 localhost vmunix: [  280.448501] BTRFS info (device sdc1): relocating block group 39503958835200 flags data|raid1
Sep 20 10:14:37 localhost vmunix: [  288.187838] BTRFS info (device sdc1): found 1215 extents, stage: move data extents
Sep 20 10:14:39 localhost vmunix: [  289.282157] ------------[ cut here ]------------
Sep 20 10:14:39 localhost vmunix: [  289.286774] kernel BUG at fs/btrfs/relocation.c:4498!
Sep 20 10:14:39 localhost vmunix: [  289.291815] Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Sep 20 10:14:39 localhost vmunix: [  289.298592] Modules linked in: btrfs blake2b_generic libcrc32c xor xor_neon raid6_pq zstd_compress onboard_usb_hub crct10dif
_ce rtc_fsl_ftm_alarm ipv6
Sep 20 10:14:39 localhost vmunix: [  289.312074] CPU: 12 PID: 4932 Comm: btrfs Not tainted 6.8.7-arm64-generic #1
Sep 20 10:14:39 localhost vmunix: [  289.319113] Hardware name: SolidRun Ltd. SolidRun CEX7 Platform, BIOS EDK II Aug  9 2021
Sep 20 10:14:39 localhost vmunix: [  289.327190] pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
Sep 20 10:14:39 localhost vmunix: [  289.334141] pc : btrfs_reloc_cow_block+0x218/0x22c [btrfs]
Sep 20 10:14:39 localhost vmunix: [  289.339651] lr : btrfs_force_cow_block+0x474/0x924 [btrfs]
Sep 20 10:14:39 localhost vmunix: [  289.345149] sp : ffff80008326b5e0
Sep 20 10:14:39 localhost vmunix: [  289.348451] x29: ffff80008326b5e0 x28: ffff0a41a1c66000 x27: 00001a63ec748000
Sep 20 10:14:39 localhost vmunix: [  289.355579] x26: 0000000000000001 x25: 0000000000000001 x24: ffff0a42aa57c980
Sep 20 10:14:39 localhost vmunix: [  289.362706] x23: ffff0a41e227f0a8 x22: ffff0a41a3d96800 x21: ffff0a424da6b2c0
Sep 20 10:14:39 localhost vmunix: [  289.369832] x20: ffff0a41c464e000 x19: ffff0a41a1c66000 x18: 0000000000000001
Sep 20 10:14:39 localhost vmunix: [  289.376959] x17: 0000000000000000 x16: ffffdd11142ddbf0 x15: 0000000000000000
Sep 20 10:14:39 localhost vmunix: [  289.384085] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000001
Sep 20 10:14:39 localhost vmunix: [  289.391211] x11: 00000000000000b6 x10: 00000000ffffffff x9 : 0000000000000000
Sep 20 10:14:39 localhost vmunix: [  289.398337] x8 : 0000000000000000 x7 : 00002352f5098000 x6 : ffff000000000000
Sep 20 10:14:39 localhost vmunix: [  289.405463] x5 : 00000000001486f3 x4 : ffff0a41c436b000 x3 : 00000000001486f2
Sep 20 10:14:39 localhost vmunix: [  289.412590] x2 : 0000000000000001 x1 : 0000000000000000 x0 : 00001a6405058000
Sep 20 10:14:39 localhost vmunix: [  289.419716] Call trace:
Sep 20 10:14:39 localhost vmunix: [  289.422151]  btrfs_reloc_cow_block+0x218/0x22c [btrfs]
Sep 20 10:14:39 localhost vmunix: [  289.427302]  btrfs_force_cow_block+0x474/0x924 [btrfs]
Sep 20 10:14:39 localhost vmunix: [  289.432452]  btrfs_cow_block+0xd8/0x2b8 [btrfs]
Sep 20 10:14:39 localhost vmunix: [  289.436994]  btrfs_search_slot+0x6d8/0xb24 [btrfs]
Sep 20 10:14:39 localhost vmunix: [  289.441795]  btrfs_delayed_ref_exit+0x43ac/0x4ee8 [btrfs]
Sep 20 10:14:39 localhost vmunix: [  289.447205]  btrfs_delayed_ref_exit+0x4c9c/0x4ee8 [btrfs]
Sep 20 10:14:39 localhost vmunix: [  289.452615]  btrfs_should_cancel_balance+0xa58/0xd7c [btrfs]
Sep 20 10:14:39 localhost vmunix: [  289.458285]  btrfs_relocate_block_group+0x240/0x378 [btrfs]
Sep 20 10:14:39 localhost vmunix: [  289.463868]  btrfs_relocate_chunk+0x3c/0x13c [btrfs]
Sep 20 10:14:39 localhost vmunix: [  289.468843]  btrfs_shrink_device+0x228/0x5ec [btrfs]
Sep 20 10:14:39 localhost vmunix: [  289.473818]  btrfs_rm_device+0x1d8/0x614 [btrfs]
Sep 20 10:14:39 localhost vmunix: [  289.478447]  btrfs_flush_workqueue+0x2c98/0x515c [btrfs]
Sep 20 10:14:39 localhost vmunix: [  289.483769]  btrfs_ioctl+0x1618/0x2544 [btrfs]
Sep 20 10:14:39 localhost vmunix: [  289.488223]  __arm64_sys_ioctl+0xa8/0xec
Sep 20 10:14:39 localhost vmunix: [  289.492138]  invoke_syscall+0x48/0x118
Sep 20 10:14:39 localhost vmunix: [  289.495881]  el0_svc_common.constprop.0+0x40/0xe8
Sep 20 10:14:39 localhost vmunix: [  289.500576]  do_el0_svc+0x20/0x2c
Sep 20 10:14:39 localhost vmunix: [  289.503881]  el0_svc+0x34/0xb8
Sep 20 10:14:39 localhost vmunix: [  289.506926]  el0t_64_sync_handler+0x13c/0x158
Sep 20 10:14:39 localhost vmunix: [  289.511271]  el0t_64_sync+0x190/0x194
Sep 20 10:14:39 localhost vmunix: [  289.514925] Code: 17ffffc2 f9401301 eb01001f 54fff760 (d4210000) 
Sep 20 10:14:39 localhost vmunix: [  289.521006] ---[ end trace 0000000000000000 ]---
Sep 20 10:14:39 localhost vmunix: [  289.976689] note: btrfs[4932] exited with irqs disabled
Sep 20 10:14:39 localhost vmunix: [  289.981937] note: btrfs[4932] exited with preempt_count 1
Sep 20 10:14:39 localhost vmunix: [  289.987717] ------------[ cut here ]------------
Sep 20 10:14:39 localhost vmunix: [  289.992331] WARNING: CPU: 12 PID: 0 at kernel/context_tracking.c:128 ct_kernel_exit.constprop.0+0x98/0xa0
Sep 20 10:14:39 localhost vmunix: [  289.992341] Modules linked in: btrfs blake2b_generic libcrc32c xor xor_neon raid6_pq zstd_compress onboard_usb_hub crct10dif
_ce rtc_fsl_ftm_alarm ipv6
Sep 20 10:14:39 localhost vmunix: [  289.992360] CPU: 12 PID: 0 Comm: swapper/12 Tainted: G      D            6.8.7-arm64-generic #1
Sep 20 10:14:39 localhost vmunix: [  289.992364] Hardware name: SolidRun Ltd. SolidRun CEX7 Platform, BIOS EDK II Aug  9 2021
Sep 20 10:14:39 localhost vmunix: [  289.992366] pstate: 200003c5 (nzCv DAIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
Sep 20 10:14:39 localhost vmunix: [  289.992370] pc : ct_kernel_exit.constprop.0+0x98/0xa0
Sep 20 10:14:39 localhost vmunix: [  289.992375] lr : ct_idle_enter+0x10/0x1c
Sep 20 10:14:39 localhost vmunix: [  289.992379] sp : ffff8000801abd10
Sep 20 10:14:39 localhost vmunix: [  289.992381] x29: ffff8000801abd10 x28: 0000000000000000 x27: 0000000000000000
Sep 20 10:14:39 localhost vmunix: [  289.992387] x26: 0000000000000000 x25: 00000043849d4753 x24: ffff0a41a40f2800
Sep 20 10:14:39 localhost vmunix: [  289.992392] x23: ffffdd1115965d68 x22: 0000000000000001 x21: ffffdd1115965dd0
Sep 20 10:14:39 localhost vmunix: [  289.992398] x20: ffffdd1115d05ad8 x19: ffff0a50b87afb50 x18: ffff80008326b168
Sep 20 10:14:39 localhost vmunix: [  289.992403] x17: 0000000000000000 x16: ffffdd11134eaea8 x15: 0000000000000000
Sep 20 10:14:39 localhost vmunix: [  289.992408] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000003
Sep 20 10:14:39 localhost vmunix: [  289.992413] x11: 071c71c71c71c71c x10: ffff0a50b87b21a4 x9 : 000000000000377c
Sep 20 10:14:39 localhost vmunix: [  289.992419] x8 : 0000000000001c1c x7 : ffff0a50b87b21c4 x6 : 00000000a796b599
Sep 20 10:14:39 localhost vmunix: [  289.992425] x5 : 4000000000000002 x4 : ffff2d3fa37a1000 x3 : ffff8000801abd10
Sep 20 10:14:39 localhost vmunix: [  289.992430] x2 : 4000000000000000 x1 : ffffdd111500eb50 x0 : ffffdd111500eb50
Sep 20 10:14:39 localhost vmunix: [  289.992435] Call trace:
Sep 20 10:14:39 localhost vmunix: [  289.992437]  ct_kernel_exit.constprop.0+0x98/0xa0
Sep 20 10:14:39 localhost vmunix: [  289.992442]  ct_idle_enter+0x10/0x1c
Sep 20 10:14:39 localhost vmunix: [  289.992446]  psci_cpu_suspend_enter+0x3c/0x90
Sep 20 10:14:39 localhost vmunix: [  289.992451]  acpi_processor_ffh_lpi_enter+0x88/0x9c
Sep 20 10:14:39 localhost vmunix: [  289.992456]  acpi_idle_lpi_enter+0x48/0x64
Sep 20 10:14:39 localhost vmunix: [  289.992461]  cpuidle_enter_state+0x108/0x2d8
Sep 20 10:14:39 localhost vmunix: [  289.992465]  cpuidle_enter+0x38/0x50
Sep 20 10:14:39 localhost vmunix: [  289.992469]  do_idle+0x1fc/0x270
Sep 20 10:14:39 localhost vmunix: [  289.992474]  cpu_startup_entry+0x38/0x3c
Sep 20 10:14:39 localhost vmunix: [  289.992479]  secondary_start_kernel+0x130/0x150
Sep 20 10:14:39 localhost vmunix: [  289.992484]  __secondary_switched+0xb8/0xbc
Sep 20 10:14:39 localhost vmunix: [  289.992489] ---[ end trace 0000000000000000 ]---

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