kernel BUG at fs/btrfs/relocation.c:2595! on 5.1.4

kernel BUG at fs/btrfs/relocation.c:2595! on 5.1.4

[Wèi Cōngruì]

I got the stack trace when I did "sudo btrfs device remove 4 ." from a
RAID1 file system.
The device 4 is bad.
There are many "BTRFS error (device sdb): bdev /dev/sdc errs: wr
19368749, rd 91, flush 10138, corrupt 0, gen 0" in kernel log.
(/dev/sdc is device 4)
There is no power loss.

The stack trace:
[34926.797727] ------------[ cut here ]------------
[34926.797731] kernel BUG at fs/btrfs/relocation.c:2595!
[34926.797744] invalid opcode: 0000 [#1] PREEMPT SMP PTI
[34926.797750] CPU: 0 PID: 16275 Comm: btrfs Not tainted 5.1.4-arch1-1-ARCH #1
[34926.797754] Hardware name: Gigabyte Technology Co., Ltd. To be
filled by O.E.M./B75-DS3V, BIOS F5a 05/30/2014
[34926.797803] RIP: 0010:select_one_root+0xfc/0x110 [btrfs]
[34926.797808] Code: 34 d4 44 89 c2 45 85 c0 74 c5 4c 8b 0e 48 89 f7
48 83 ee 08 49 8b 09 4d 8b 49 20 49 83 c1 40 4c 39 c9 75 92 41 83 e8
01 eb d8 <0f> 0b 48 89 d5 eb ac 31 ed eb a8 e8 a4 0e cd fa 0f 1f 40 00
0f 1f
[34926.797817] RSP: 0018:ffffb937831aba60 EFLAGS: 00010246
[34926.797821] RAX: ffff99e7cb8c0900 RBX: ffff99e7cb8c0180 RCX: 0000000000000002
[34926.797825] RDX: 0000000000000000 RSI: ffffb937831aba68 RDI: ffff99e7cb8c0900
[34926.797829] RBP: 0000000000000000 R08: 0000000000000002 R09: ffff99e7cb8c0940
[34926.797833] R10: ffffe5db423e7dc0 R11: 0000000000000002 R12: ffffb937831abb80
[34926.797837] R13: ffff99e74f9f7920 R14: 0000000000000000 R15: ffff99e74f9f7900
[34926.797842] FS:  00007f10629188c0(0000) GS:ffff99e7db000000(0000)
knlGS:0000000000000000
[34926.797847] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[34926.797851] CR2: 00007f9d31f97340 CR3: 0000000057e48001 CR4: 00000000001606f0
[34926.797855] Call Trace:
[34926.797898]  relocate_tree_blocks+0x144/0x640 [btrfs]
[34926.797926]  ? btrfs_release_path+0x2c/0x80 [btrfs]
[34926.797961]  ? add_data_references+0x2a6/0x2c0 [btrfs]
[34926.797996]  relocate_block_group+0x433/0x5b0 [btrfs]
[34926.798031]  btrfs_relocate_block_group+0x18b/0x210 [btrfs]
[34926.798068]  btrfs_relocate_chunk+0x31/0xa0 [btrfs]
[34926.798104]  btrfs_shrink_device+0x1db/0x560 [btrfs]
[34926.798113]  ? preempt_count_sub+0x90/0xa0
[34926.798148]  btrfs_rm_device+0x171/0x590 [btrfs]
[34926.798183]  ? btrfs_ioctl+0x1d38/0x2e10 [btrfs]
[34926.798190]  ? __check_object_size+0xc1/0x175
[34926.798224]  btrfs_ioctl+0x1d7e/0x2e10 [btrfs]
[34926.798232]  ? _raw_spin_unlock+0x16/0x30
[34926.798237]  ? __handle_mm_fault+0x117d/0x15c0
[34926.798244]  ? do_vfs_ioctl+0xa4/0x630
[34926.798247]  do_vfs_ioctl+0xa4/0x630
[34926.798251]  ? handle_mm_fault+0x10a/0x250
[34926.798258]  ? syscall_trace_enter+0x1d3/0x2d0
[34926.798262]  ksys_ioctl+0x60/0x90
[34926.798266]  __x64_sys_ioctl+0x16/0x20
[34926.798271]  do_syscall_64+0x5b/0x180
[34926.798277]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[34926.798282] RIP: 0033:0x7f1062a0ccbb
[34926.798286] Code: 0f 1e fa 48 8b 05 a5 d1 0c 00 64 c7 00 26 00 00
00 48 c7 c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00
00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 75 d1 0c 00 f7 d8 64 89
01 48
[34926.798294] RSP: 002b:00007ffcef54e4a8 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[34926.798300] RAX: ffffffffffffffda RBX: 00007ffcef550650 RCX: 00007f1062a0ccbb
[34926.798304] RDX: 00007ffcef54f4d0 RSI: 000000005000943a RDI: 0000000000000003
[34926.798308] RBP: 00007ffcef54f4d0 R08: 00007ffcef552820 R09: 0000000000000000
[34926.798312] R10: 00007f1062a8aae0 R11: 0000000000000246 R12: 0000000000000001
[34926.798316] R13: 0000000000000000 R14: 0000000000000003 R15: 00007ffcef550658
[34926.798322] Modules linked in: xt_nat veth nf_conntrack_netlink
nfnetlink xfrm_user xfrm_algo xt_addrtype iptable_filter xt_conntrack
br_netfilter bridge cfg80211 xt_TCPMSS xt_tcpudp iptable_mangle
ipt_MASQUERADE iptable_nat rfkill nf_nat 8021q garp mrp stp
nf_conntrack llc nf_defrag_ipv6 nf_defrag_ipv4 nls_iso8859_1 nls_cp437
vfat fat snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio
intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp i915 kvm
snd_hda_intel i2c_algo_bit snd_hda_codec drm_kms_helper irqbypass
snd_hda_core crct10dif_pclmul snd_hwdep crc32_pclmul drm snd_pcm
iTCO_wdt ghash_clmulni_intel mei_hdcp iTCO_vendor_support cryptd
intel_cstate r8169 snd_timer intel_uncore realtek snd intel_rapl_perf
i2c_i801 pcspkr libphy mei_me soundcore intel_gtt lpc_ich mei agpgart
evdev syscopyarea ie31200_edac sysfillrect mac_hid pcc_cpufreq
sysimgblt fb_sys_fops nfsd auth_rpcgss nfs_acl lockd grace sunrpc
tcp_bbr sch_fq ip_tables x_tables btrfs libcrc32c crc32c_generic xor
[34926.798356]  raid6_pq sd_mod ahci libahci crc32c_intel libata
xhci_pci scsi_mod ehci_pci ehci_hcd xhci_hcd
[34926.798398] ---[ end trace b1d0f5815d520d21 ]---
[34926.798432] RIP: 0010:select_one_root+0xfc/0x110 [btrfs]
[34926.798436] Code: 34 d4 44 89 c2 45 85 c0 74 c5 4c 8b 0e 48 89 f7
48 83 ee 08 49 8b 09 4d 8b 49 20 49 83 c1 40 4c 39 c9 75 92 41 83 e8
01 eb d8 <0f> 0b 48 89 d5 eb ac 31 ed eb a8 e8 a4 0e cd fa 0f 1f 40 00
0f 1f
[34926.798444] RSP: 0018:ffffb937831aba60 EFLAGS: 00010246
[34926.798448] RAX: ffff99e7cb8c0900 RBX: ffff99e7cb8c0180 RCX: 0000000000000002
[34926.798452] RDX: 0000000000000000 RSI: ffffb937831aba68 RDI: ffff99e7cb8c0900
[34926.798456] RBP: 0000000000000000 R08: 0000000000000002 R09: ffff99e7cb8c0940
[34926.798460] R10: ffffe5db423e7dc0 R11: 0000000000000002 R12: ffffb937831abb80
[34926.798464] R13: ffff99e74f9f7920 R14: 0000000000000000 R15: ffff99e74f9f7900
[34926.798469] FS:  00007f10629188c0(0000) GS:ffff99e7db000000(0000)
knlGS:0000000000000000
[34926.798474] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[34926.798477] CR2: 00007f9d31f97340 CR3: 0000000057e48001 CR4: 00000000001606f0

Re: kernel BUG at fs/btrfs/relocation.c:2595! on 5.1.4

[Wèi Cōngruì]

I upgraded the kernel to 5.1.5.
Got the same error with the command "btrfs device remove 4 ." again.

Re: kernel BUG at fs/btrfs/relocation.c:2595! on 5.1.4

[Qu Wenruo]

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On 2019/5/29 下午9:23, Wèi Cōngruì wrote:
> I upgraded the kernel to 5.1.5.
> Got the same error with the command "btrfs device remove 4 ." again.
> 
It a known bug and is going to be fixed by this patch:
https://patchwork.kernel.org/patch/10955321/

The backport will happen soon, but I'm afraid it's not backported to
stable branch yet.

Thanks,
Qu


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