[systemd-devel] [systemd]: sd-sync lead to kernel panic

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Dear all,


systemd version: v234
kernel version: 5.1.5


My embedded system uses systemd. Occasionally kernel panic appears in this system. It is found that it is related to sd-sync in systemd. How to analyze this and why?
What causes this problem? Or can you see that sd-sync has a problem processing that file or service?
If you have any ideas or opinions, or need any specific information, please let me know. 


Thank you.



[ 1664.582102] Unable to handle kernel paging request at virtual address 7f8bba1c
[ 1664.589350] pgd = fb46e47e
[ 1664.592062] [7f8bba1c] *pgd=00000000
[ 1664.595666] Internal error: Oops: 80000005 [#1] ARM
[ 1664.600558] CPU: 0 PID: 14730 Comm: (sd-sync) Not tainted 5.1.5-yocto-s-dirty-fd96c2b #1
[ 1664.608641] Hardware name: Generic DT based system
[ 1664.613444] PC is at 0x7f8bba1c
[ 1664.616617] LR is at xas_find_marked+0x94/0x230
[ 1664.621148] pc : [<7f8bba1c>]    lr : [<80744690>]    psr: 60000013
[ 1664.627411] sp : 95eeddb0  ip : ffffffc0  fp : 95eede4c
[ 1664.632627] r10: 00000000  r9 : 00000000  r8 : 9e004bcc
[ 1664.637847] r7 : 95eedec8  r6 : 95eedec8  r5 : 00000001  r4 : 00000000
[ 1664.644363] r3 : 00000002  r2 : 00000000  r1 : 00040000  r0 : a0000013
[ 1664.650883] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[ 1664.658006] Control: 00c5387d  Table: 95f60008  DAC: 00000051
[ 1664.663751] Process (sd-sync) (pid: 14730, stack limit = 0x7a5416e4)
[ 1664.670097] Stack: (0x95eeddb0 to 0x95eee000)
[ 1664.674452] dda0:                                     8073815c 80737de8 00000001 00000002
[ 1664.682628] ddc0: 00000000 ffffffff 9e004bcc 801faba8 ffffffff 7fffffff 00000000 80740000
[ 1664.690801] dde0: 80b107e0 42139f9a 80b07008 80748498 95eede14 9ac1a120 95f13b00 80b107e0
[ 1664.698972] de00: 9af73540 00000000 95eede5c 95eede18 807480c4 8013b46c 9ad45044 80b07008
[ 1664.707146] de20: 95eede54 9e004bcc 95eedec8 95eedec8 801faba8 9e004a90 95eec000 00000000
[ 1664.715319] de40: 95eede7c 95eede50 801fd538 801fcf7c 95eede50 95eede50 95eede58 95eede58
[ 1664.723491] de60: 95000000 80b07008 9e004bcc 9e004bcc 95eede8c 95eede80 802793c8 801fd4e4
[ 1664.731664] de80: 95eedec4 95eede90 801fd430 802793bc 9ad8d000 8026ac14 95eedf04 95eedea8
[ 1664.739836] dea0: 8026ac14 80b07008 9e004bcc 7fffffff ffffffff 7fffffff 95eedf0c 95eedec8
[ 1664.748008] dec0: 801ec328 801fd3ec 7fffffff 00000000 00000000 00000000 ffffffff 7fffffff
[ 1664.756182] dee0: 00000001 00000000 8039002c 80b07008 9ad8d000 ffffffff 8026e4d8 80b075a8
[ 1664.764356] df00: 95eedf34 95eedf10 801ec3a0 801ec2a4 ffffffff 7fffffff 00000001 8027b4fc
[ 1664.772528] df20: 9e004af8 00000000 95eedf44 95eedf38 8026e4f8 801ec374 95eedf6c 95eedf48
[ 1664.780700] df40: 8027b51c 8026e4e4 00000000 00000000 00c38f68 00000024 801011e4 95eec000
[ 1664.788872] df60: 95eedf94 95eedf70 8026e724 8027b4bc 8010ba08 00000000 00000001 80b07008
[ 1664.797044] df80: 00000000 00000000 95eedfa4 95eedf98 8026e798 8026e6c0 00000000 95eedfa8
[ 1664.805218] dfa0: 80101000 8026e78c 00000000 00000000 00000000 00020000 00000000 6ade8c00
[ 1664.813388] dfc0: 00000000 00000000 00c38f68 00000024 00000000 7e8d7740 7e8d774c 00000003
[ 1664.821562] dfe0: 43759194 7e8d76cc 435e77f0 4307ef9c 60000010 00000000 00000000 00000000
[ 1664.829724] Backtrace:
[ 1664.832205] [<801fcf70>] (write_cache_pages) from [<801fd538>] (generic_writepages+0x60/0x98)
[ 1664.840729]  r10:00000000 r9:95eec000 r8:9e004a90 r7:801faba8 r6:95eedec8 r5:95eedec8
[ 1664.848549]  r4:9e004bcc
[ 1664.851107] [<801fd4d8>] (generic_writepages) from [<802793c8>] (blkdev_writepages+0x18/0x1c)
[ 1664.859620]  r5:9e004bcc r4:9e004bcc
[ 1664.863209] [<802793b0>] (blkdev_writepages) from [<801fd430>] (do_writepages+0x50/0xf8)
[ 1664.871317] [<801fd3e0>] (do_writepages) from [<801ec328>] (__filemap_fdatawrite_range+0x90/0xd0)
[ 1664.880182]  r7:7fffffff r6:ffffffff r5:7fffffff r4:9e004bcc
[ 1664.885848] [<801ec298>] (__filemap_fdatawrite_range) from [<801ec3a0>] (filemap_fdatawrite+0x38/0x40)
[ 1664.895145]  r7:80b075a8 r6:8026e4d8 r4:ffffffff
[ 1664.899779] [<801ec368>] (filemap_fdatawrite) from [<8026e4f8>] (fdatawrite_one_bdev+0x20/0x24)
[ 1664.908467]  r5:00000000 r4:9e004af8
[ 1664.912062] [<8026e4d8>] (fdatawrite_one_bdev) from [<8027b51c>] (iterate_bdevs+0x6c/0xc4)
[ 1664.920343] [<8027b4b0>] (iterate_bdevs) from [<8026e724>] (ksys_sync+0x70/0xcc)
[ 1664.927737]  r9:95eec000 r8:801011e4 r7:00000024 r6:00c38f68 r5:00000000 r4:00000000
[ 1664.935482] [<8026e6b4>] (ksys_sync) from [<8026e798>] (sys_sync+0x18/0x20)
[ 1664.942436]  r4:00000000
[ 1664.944980] [<8026e780>] (sys_sync) from [<80101000>] (ret_fast_syscall+0x0/0x54)
[ 1664.952455] Exception stack(0x95eedfa8 to 0x95eedff0)
[ 1664.957504] dfa0:                   00000000 00000000 00000000 00020000 00000000 6ade8c00
[ 1664.965681] dfc0: 00000000 00000000 00c38f68 00000024 00000000 7e8d7740 7e8d774c 00000003
[ 1664.973848] dfe0: 43759194 7e8d76cc 435e77f0 4307ef9c
[ 1664.978897] Code: bad PC value
[ 1664.981964] ---[ end trace c910aadcc156272b ]---
[ 1664.986580] Kernel panic - not syncing: Fatal exception
[ 1664.991813] ---[ end Kernel panic - not syncing: Fatal exception ]---




thanks,
Byron
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