Re: kernel BUG at fs/inode.c:531!

[nirinA raseliarison]

hello!
no issue yet with 5.8:

Linux version 5.8.0.20200803 (nirina@xxxxxxxxxxxxx) (gcc (GCC) 10.2.0,
GNU ld version 2.33.1-slack15) #1 SMP Mon Aug 3 16:17:10 EAT 2020

it seems that the bug was triggered when i ran programs compiled
against gcc-9.3.0 under kernel build with gcc-10.1.0, but not sure if
that is the real problem. running the programs under the same compiler
doesn't exhibit the bug and since i rebuilt the programs with
gcc-10.1.0, i no longer hit the issue.

here is my /proc/mounts :

/dev/root / ext4 rw,relatime 0 0
devtmpfs /dev devtmpfs rw,relatime,size=3927496k,nr_inodes=981874,mode=755 0 0
proc /proc proc rw,relatime 0 0
sysfs /sys sysfs rw,relatime 0 0
tmpfs /run tmpfs rw,nosuid,nodev,noexec,relatime,size=32768k,mode=755 0 0
devpts /dev/pts devpts rw,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /dev/shm tmpfs rw,relatime 0 0
cgroup_root /sys/fs/cgroup tmpfs rw,relatime,size=8192k,mode=755 0 0
cpuset /sys/fs/cgroup/cpuset cgroup rw,relatime,cpuset 0 0
cpu /sys/fs/cgroup/cpu cgroup rw,relatime,cpu 0 0
cpuacct /sys/fs/cgroup/cpuacct cgroup rw,relatime,cpuacct 0 0
blkio /sys/fs/cgroup/blkio cgroup rw,relatime,blkio 0 0
memory /sys/fs/cgroup/memory cgroup rw,relatime,memory 0 0
devices /sys/fs/cgroup/devices cgroup rw,relatime,devices 0 0
freezer /sys/fs/cgroup/freezer cgroup rw,relatime,freezer 0 0
net_cls /sys/fs/cgroup/net_cls cgroup rw,relatime,net_cls 0 0
perf_event /sys/fs/cgroup/perf_event cgroup rw,relatime,perf_event 0 0
/dev/sda3 /mnt/sda3 ext4 rw,relatime 0 0
/dev/sda5 /usr/local ext4 rw,relatime 0 0
/dev/sda6 /mnt/big ext4 rw,relatime 0 0
/dev/sda1 /mnt/sda1 ext4 rw,relatime 0 0
tmpfs /var/run tmpfs rw,nosuid,nodev,noexec,relatime,size=32768k,mode=755 0 0
nfsd /proc/fs/nfs nfsd rw,relatime 0 0
nfsd /proc/fs/nfsd nfsd rw,relatime 0 0
devpts /dev/pts devpts rw,relatime,gid=5,mode=620,ptmxmode=000 0 0
none /var/run/user/1000 tmpfs rw,relatime,size=102400k,mode=700,uid=1000 0 0
none /run/user/1000 tmpfs rw,relatime,size=102400k,mode=700,uid=1000 0 0
none /var/run/user/0 tmpfs rw,relatime,size=102400k,mode=700 0 0
none /run/user/0 tmpfs rw,relatime,size=102400k,mode=700 0 0
nirina:/mnt/sda6 /mnt/sda6 nfs
rw,relatime,vers=3,rsize=262144,wsize=262144,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.100.2,mountvers=3,mountport=37772,mountproto=udp,local_lock=none,addr=192.168.100.2
0 0
nirina:/mnt/sda14 /mnt/sda14 nfs
rw,relatime,vers=3,rsize=262144,wsize=262144,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.100.2,mountvers=3,mountport=37772,mountproto=udp,local_lock=none,addr=192.168.100.2
0 0
nirina:/mnt/sda15 /mnt/sda15 nfs
rw,relatime,vers=3,rsize=262144,wsize=262144,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.100.2,mountvers=3,mountport=37772,mountproto=udp,local_lock=none,addr=192.168.100.2
0 0
nirina:/mnt/sda16 /mnt/sda16 nfs
rw,relatime,vers=3,rsize=262144,wsize=262144,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.100.2,mountvers=3,mountport=37772,mountproto=udp,local_lock=none,addr=192.168.100.2
0 0


Le mar. 4 août 2020 à 14:19, Jan Kara <jack@xxxxxxx> a écrit :
>
> Hello!
>
> On Wed 27-05-20 21:05:55, nirinA raseliarison wrote:
> > i hit again this bug with:
> >
> > $ cat /proc/version
> > Linux version 5.7.0-rc7.20200525 (nirina@xxxxxxxxxxxxx) (gcc version
> > 10.1.0 (GCC), GNU ld version 2.33.1-slack15) #1 SMP Mon May 25
> > 02:49:28 EAT 2020
>
> Thanks for report! I see this didn't get any reply. Can you still hit this
> issue with 5.8? If yes, what workload do you run on the machine to trigger
> this? Can you send contents of /proc/mounts please? Thanks!
>
>                                                                 Honza
>
> >
> >
> > [99390.044690] ------------[ cut here ]------------
> > [99390.044695] kernel BUG at fs/inode.c:531!
> > [99390.044702] invalid opcode: 0000 [#1] SMP PTI
> > [99390.044705] CPU: 0 PID: 149 Comm: kswapd0 Not tainted 5.7.0-rc7.20200525 #1
> > [99390.044706] Hardware name: To be filled by O.E.M. To be filled by
> > O.E.M./ONDA H61V Ver:4.01, BIOS 4.6.5 01/07/2013
> > [99390.044712] RIP: 0010:clear_inode+0x75/0x80
> > [99390.044714] Code: a8 20 74 2a a8 40 75 28 48 8b 83 28 01 00 00 48
> > 8d 93 28 01 00 00 48 39 c2 75 17 48 c7 83 98 00 00 00 60 00 00 00 5b
> > c3 0f 0b <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b 90 0f 1f 44 00 00 53 ba 48 02
> > 00 00
> > [99390.044716] RSP: 0018:ffffc900004c7b50 EFLAGS: 00010006
> > [99390.044717] RAX: 0000000000000000 RBX: ffff88808c5f9e38 RCX: 0000000000000000
> > [99390.044718] RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88808c5f9fb8
> > [99390.044719] RBP: ffff88808c5f9e38 R08: ffffffffffffffff R09: ffffc900004c7cd8
> > [99390.044720] R10: 0000000000000000 R11: 0000000000000001 R12: ffff88808c5f9fb0
> > [99390.044721] R13: ffff888215658000 R14: ffff888215658070 R15: 000000000000014c
> > [99390.044723] FS:  0000000000000000(0000) GS:ffff888217600000(0000)
> > knlGS:0000000000000000
> > [99390.044724] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [99390.044725] CR2: 00000006f9004000 CR3: 00000001511da001 CR4: 00000000001606f0
> > [99390.044726] Call Trace:
> > [99390.044732]  ext4_clear_inode+0x16/0x80
> > [99390.044736]  ext4_evict_inode+0x58/0x4c0
> > [99390.044738]  evict+0xbf/0x180
> > [99390.044740]  prune_icache_sb+0x7e/0xb0
> > [99390.044743]  super_cache_scan+0x161/0x1e0
> > [99390.044746]  do_shrink_slab+0x146/0x290
> > [99390.044749]  shrink_slab+0xac/0x2a0
> > [99390.044752]  ? __switch_to_asm+0x40/0x70
> > [99390.044754]  shrink_node+0x16f/0x660
> > [99390.044757]  balance_pgdat+0x2cf/0x5b0
> > [99390.044759]  kswapd+0x1dc/0x3a0
> > [99390.044762]  ? __schedule+0x217/0x710
> > [99390.044764]  ? wait_woken+0x80/0x80
> > [99390.044766]  ? balance_pgdat+0x5b0/0x5b0
> > [99390.044768]  kthread+0x118/0x130
> > [99390.044770]  ? kthread_create_worker_on_cpu+0x70/0x70
> > [99390.044772]  ret_from_fork+0x35/0x40
> > [99390.044773] Modules linked in: 8021q garp stp mrp llc rtl8192cu
> > rtl_usb rtl8192c_common rtlwifi mac80211 cfg80211 uas usb_storage
> > nct6775 hwmon_vid ipv6 rfkill nf_defrag_ipv6 snd_pcm_oss snd_mixer_oss
> > fuse hid_generic usbhid hid snd_hda_codec_hdmi snd_hda_codec_realtek
> > snd_hda_codec_generic i2c_dev coretemp hwmon i915 x86_pkg_temp_thermal
> > intel_powerclamp kvm_intel kvm i2c_algo_bit irqbypass drm_kms_helper
> > evdev r8169 snd_hda_intel syscopyarea snd_intel_dspcfg realtek
> > snd_hda_codec libphy crc32_pclmul sysfillrect serio_raw sysimgblt
> > snd_hwdep fb_sys_fops snd_hda_core drm snd_pcm fan thermal
> > drm_panel_orientation_quirks snd_timer intel_gtt 8250 agpgart snd
> > 8250_base ehci_pci serial_core button ehci_hcd video soundcore
> > i2c_i801 lpc_ich mfd_core mei_me mei loop
> > [99390.044800] ---[ end trace 2ca57858c52a0ad4 ]---
> >
> > --
> > nirinA
> --
> Jan Kara <jack@xxxxxxxx>
> SUSE Labs, CR