kernel BUG at fs/jffs2/gc.c:395

[Tao Ren]

Hi all,

I hit below kernel BUG while booting up openbmc-linux-4.17.2 on Facebook Backpack-CMM BMC (AST2500). The crash happens right after mounting /dev/mtdblock3 to /mnt/data directory. Did anyone hit similar backtrace before?

BTW, fs/jffs2/gc.c was not changed in the past 2 years, so file content is the same in dev-4.18 tree.

data0 partition found on /dev/mtdblock3; mounting to /mnt/data.
[   31.045370] jffs2: notice: (1084) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found.
[   31.272704] jffs2: warning: (1086) jffs2_do_read_inode_internal: no data nodes found for ino #2
[   31.376941] jffs2: notice: (1086) jffs2_do_read_inode_internal: but it has children so we fake some modes for it
Populating dev cache
[   32.315906] jffs2: Inode #250 already in state 0 in jffs2_garbage_collect_pass()!
[   32.405599] ------------[ cut here ]------------
[   32.460773] kernel BUG at /data/users/taoren/openbmc/build-cmm/tmp/work-shared/cmm/kernel-source/fs/jffs2/gc.c:395!
[   32.585668] Internal error: Oops - BUG: 0 [#1] ARM
[   32.642972] Modules linked in: pfe3000 fancpld(O) cmmcpld(O) i2c_dev_sysfs(O)
[   32.728367] CPU: 0 PID: 1085 Comm: jffs2_gcd_mtd3 Tainted: G           O      4.17.2-635177a5c64fa51c04f317d61c9a642205c05750 #1
[   32.866776] Hardware name: Generic DT based system
[   32.924121] PC is at jffs2_garbage_collect_pass+0x524/0x728
[   32.990759] LR is at jffs2_garbage_collect_pass+0x524/0x728
[   33.057411] pc : [<802b0cb0>]    lr : [<802b0cb0>]    psr: 60000013
[   33.132393] sp : b094be80  ip : 00000000  fp : b094becc
[   33.194897] r10: b095d980  r9 : b0961ec0  r8 : b55a0b94
[   33.257401] r7 : 0000e58c  r6 : b08dbc2c  r5 : 00000000  r4 : b08dbc00
[   33.335505] r3 : b5707040  r2 : 00000000  r1 : 60000093  r0 : b08dbc2c
[   33.413611] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[   33.498996] Control: 00c5387d  Table: b096c008  DAC: 00000051
[   33.567747] Process jffs2_gcd_mtd3 (pid: 1085, stack limit = 0x30802448)
[   33.647924] Stack: (0xb094be80 to 0xb094c000)
[   33.700037] be80: 8f321be0 00000104 b094bea4 b094be98 801260dc 80123884 b094becc 8f321be0
[   33.797898] bea0: 801263c8 b08dbc00 b094a000 00000104 b08dbc00 802b34cc b0992d18 b099bd28
[   33.895761] bec0: b094bf7c b094bed0 802b35ac 802b0798 b5731a10 00000001 00000000 805f2290
[   33.993625] bee0: b0990540 cd00d2bb 80903028 b57072b0 b094bf14 b57319e0 b5707040 b0990540
[   34.091488] bf00: 8090ad90 b0990540 b094bf64 b094bf18 805f2290 8013ccac 00000000 00000003
[   34.189352] bf20: 00000000 a0000013 b559fb40 805f25e0 b08dbc00 8f321be0 b0992d18 b094a000
[   34.287217] bf40: b559fb40 00000000 b08dbc00 802b34cc b0992d18 80135380 b094bf7c 8f321be0
[   34.385082] bf60: b0992d00 b0992d00 b559fb40 00000000 b094bfac b094bf80 80135388 802b34d8
[   34.482944] bf80: b094a000 b559fb40 8013526c 00000000 00000000 00000000 00000000 00000000
[   34.580808] bfa0: 00000000 b094bfb0 801010e8 80135278 00000000 00000000 00000000 00000000
[   34.678671] bfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   34.776534] bfe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[   34.874441] [<802b0cb0>] (jffs2_garbage_collect_pass) from [<802b35ac>] (jffs2_garbage_collect_thread+0xe0/0x194)
[   34.997261] [<802b35ac>] (jffs2_garbage_collect_thread) from [<80135388>] (kthread+0x11c/0x158)
[   35.101351] [<80135388>] (kthread) from [<801010e8>] (ret_from_fork+0x14/0x2c)
[   35.187749] Exception stack(0xb094bfb0 to 0xb094bff8)
[   35.248174] bfa0:                                     00000000 00000000 00000000 00000000
[   35.346039] bfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   35.443901] bfe0: 00000000 00000000 00000000 00000000 00000013 00000000
[   35.523056] Code: e59f01fc ebfa6db2 e1a00006 eb0d0a51 (e7f001f2)
[   35.595964] ---[ end trace bb6111c1fc9b2a99 ]---
[   35.651173] Kernel panic - not syncing: Fatal exception


Thanks,

Tao
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