PROBLEM: JFFS2 Summary Oops - v4.19.16

PROBLEM: JFFS2 Summary Oops - v4.19.16

[Sreeram Veluthakkal]

[1.] One line summary of the problem: JFFS2 Summary Oops - v4.19.16
[2.] Full description of the problem/report:
Kernel oops in JFFS2  in 4.19.16 (tainted). I couldn't find any similar known problems or a way to recreate this bug. Appreciate any leads to help recreate/rootcause/fix this bug.

There are two partitions mounted with jffs2.
mtd:abc on /flash/mnt1 type jffs2 (rw,seclabel,noatime)
/dev/mtdblock1 on /flash/mnt2 type jffs2 (rw,seclabel,relatime)

/flash/mnt2 generally has more I/O than /flash/mnt1. After the system rebooted, I checked the disk usage of both paritions and they were under 40%.

[3.] Keywords (i.e., modules, networking, kernel): JFFS2, filesystem, SPI
[4.] Kernel information
[4.1.] Kernel version (from /proc/version): Linux version 4.19.16 (oe-user@oe-host) (gcc version 7.3.0 (GCC)) #1 SMP Thu Mar 12 02:29:52 UTC 2020
[4.2.] Kernel .config file:
[5.] Most recent kernel version which did not have the bug:
[6.] Output of Oops.. message (if applicable) with symbolic information
     resolved (see Documentation/admin-guide/bug-hunting.rst)

[  513.760000] ------------[ cut here ]------------
[  513.760000] kernel BUG at fs/jffs2/summary.c:862!
[  513.770000] Internal error: Oops - BUG: 0 [#1] SMP ARM
[  513.800000] CPU: 1 PID: 1976 Comm: jffs2_gcd_mtd10 Tainted: G           O      4.19.16 #1
[  513.810000] PC is at jffs2_sum_write_sumnode+0x88/0x54c
[  513.820000] LR is at jffs2_sum_write_sumnode+0x88/0x54c
[  513.820000] pc : [<b03c5f3c>]    lr : [<b03c5f3c>]    psr: 60000013
[  513.830000] sp : c5d17c90  ip : 00000000  fp : c5d17d8c
[  513.830000] r10: 000000c4  r9 : 00000f84  r8 : c5c7829c
[  513.840000] r7 : c7ce5800  r6 : 00000fac  r5 : c7ce5800  r4 : c6a22a80
[  513.850000] r3 : 86281bc8  r2 : 86281bc8  r1 : ccb2e2e8  r0 : 00000045
[  513.850000] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[  513.860000] Control: 18c5387d  Table: 0ecb804a  DAC: 00000051
[  513.870000] Process jffs2_gcd_mtd10 (pid: 1976, stack limit = 0xa8ed1488)
[  513.870000] Stack: (0xc5d17c90 to 0xc5d18000)
[  513.880000] 7c80:                                     60000013 00000001 c5d17cb0 b08880ec
[  513.880000] 7ca0: c7ce5940 c7ce5918 00000000 b0d054c8 00000000 00000000 00000000 c5d17cbc
[  513.890000] 7cc0: c5d17cbc 86281bc8 a0000013 c7ce5960 c7ce5800 c7eb6ba0 00000002 000005d6
[  513.900000] 7ce0: 00000000 86281bc8 c79621f8 c7ce5800 c5c7829c 00000fac c7ce5800 b0a333bc
[  513.910000] 7d00: 00000f84 000000c4 c5d17d8c b03b5068 00001f40 b03b73e4 00000044 000000c4
[  513.920000] 7d20: c5d17de8 c5c9cb00 c7ce5918 000000c4 c7ce5800 00000f84 c5d17d8c c7eb6ba0
[  513.930000] 7d40: c7ce5800 b03b56f0 c5c9cb00 c796221c c7ce5800 00000000 00000f84 c5cff4e0
[  513.930000] 7d60: c7eb6ba0 b03bafe4 c7ce5960 ffffe000 c79621f8 00000008 b0142b98 00000001
[  513.940000] 7d80: b0d054c8 b03b7720 b0d05340 000000c4 c5d17de8 86281bc8 c7962238 c5c9cb00
[  513.950000] 7da0: c796221c c6a2b0f0 00000000 c5cff4e0 00001000 c79621f8 c7ce5800 b03bb9ec
[  513.960000] 7dc0: c7962238 b0d054c8 c79621f8 b08880d4 00001f40 b03be798 c5c799f8 000000c4
[  513.970000] 7de0: b0d054c8 c7ce5800 e0021985 00000d10 d440f0bb 00000008 000005d6 000081fc
[  513.970000] 7e00: 03d90000 00001f40 5e9af375 5e9af375 5e9af375 00000334 00000ccc 00000ccc
[  513.980000] 7e20: 00000000 f0504a5b a929cd16 86281bc8 c7ce5800 b0d054c8 c7ce5800 00000008
[  513.990000] 7e40: 00000000 c5cff4e0 00000008 b03bec90 c7ce5918 86281bc8 00000000 c7ce5800
[  514.000000] 7e60: c7ce5918 b0d054c8 00000000 ffffffb3 c5c799f8 c5cff4e0 c79621f8 b03baeb0
[  514.010000] 7e80: c695dcf0 b012701c c7ce5960 c7ce584c 0000000c 00000001 c695d800 b0888104
[  514.020000] 7ea0: b0d054c8 c5d17edc 86281bc8 86281bc8 b0d054c8 c695d800 c7ce5800 c7ce5918
[  514.020000] 7ec0: c5d16000 ffffe000 00000504 00000001 c6b24228 b03bdac0 b0d03900 00000001
[  514.030000] 7ee0: 00000000 00000001 00000000 00000080 00000000 00000000 00000000 00000000
[  514.040000] 7f00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  514.050000] 7f20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  514.060000] 7f40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  514.060000] 7f60: 00000000 86281bc8 c6b24200 c9da5d80 00000000 c5d16000 c7ce5800 b03bd8ec
[  514.070000] 7f80: c7f41dd8 b01392ec 00000099 c9da5d80 b013919c 00000000 00000000 00000000
[  514.080000] 7fa0: 00000000 00000000 00000000 b01010e8 00000000 00000000 00000000 00000000
[  514.090000] 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  514.100000] 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[  514.110000] [<b03c5f3c>] (jffs2_sum_write_sumnode) from [<b03b5068>] (jffs2_do_reserve_space+0x84/0x3e0)
[  514.110000] [<b03b5068>] (jffs2_do_reserve_space) from [<b03b56f0>] (jffs2_reserve_space_gc+0x40/0x80)
[  514.120000] [<b03b56f0>] (jffs2_reserve_space_gc) from [<b03bafe4>] (jffs2_garbage_collect_pristine+0x64/0x400)
[  514.130000] [<b03bafe4>] (jffs2_garbage_collect_pristine) from [<b03bb9ec>] (jffs2_garbage_collect_live+0x4a0/0x10f0)
[  514.140000] [<b03bb9ec>] (jffs2_garbage_collect_live) from [<b03baeb0>] (jffs2_garbage_collect_pass+0x7d4/0x8a4)
[  514.150000] [<b03baeb0>] (jffs2_garbage_collect_pass) from [<b03bdac0>] (jffs2_garbage_collect_thread+0x1d4/0x20c)
[  514.170000] [<b03bdac0>] (jffs2_garbage_collect_thread) from [<b01392ec>] (kthread+0x150/0x15c)
[  514.170000] [<b01392ec>] (kthread) from [<b01010e8>] (ret_from_fork+0x14/0x2c)
[  514.180000] Exception stack(0xc5d17fb0 to 0xc5d17ff8)
[  514.190000] 7fa0:                                     00000000 00000000 00000000 00000000
[  514.190000] 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[  514.200000] 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[  514.210000] Code: e34b00a3 e593300c e59313a8 ebf69ae1 (e7f001f2) 
[  514.220000] ---[ end trace d60044e37afc2dfd ]---
[  514.230000] Kernel panic - not syncing: Fatal exception
[  514.240000] CPU0: stopping
[  514.240000] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G      D    O      4.19.16 #1
[  514.240000] [<b010cd70>] (unwind_backtrace) from [<b0107538>] (show_stack+0x18/0x1c)
[  514.240000] [<b0107538>] (show_stack) from [<b086c208>] (dump_stack+0x88/0x9c)
[  514.240000] [<b086c208>] (dump_stack) from [<b010a248>] (handle_IPI+0x1d8/0x370)
[  514.240000] [<b010a248>] (handle_IPI) from [<b0102818>] (gic_handle_irq+0x7c/0x80)
[  514.240000] [<b0102818>] (gic_handle_irq) from [<b01020ac>] (__irq_svc+0x6c/0x90)
[  514.240000] Exception stack(0xb0d01f18 to 0xb0d01f60)
[  514.240000] 1f00:                                                       00000000 002ba614
[  514.240000] 1f20: ccb21300 b0112560 00000000 ffffe000 b0d054e8 b0d05530 00000001 00000000
[  514.240000] 1f40: b0c87968 b0d054c8 00000000 b0d01f68 b01043f0 b01043f4 600b0013 ffffffff
[  514.240000] [<b01020ac>] (__irq_svc) from [<b01043f4>] (arch_cpu_idle+0x3c/0x40)
[  514.240000] [<b01043f4>] (arch_cpu_idle) from [<b0146fb0>] (do_idle+0x104/0x200)
[  514.240000] [<b0146fb0>] (do_idle) from [<b014734c>] (cpu_startup_entry+0x20/0x24)
[  514.240000] [<b014734c>] (cpu_startup_entry) from [<b0c00ee4>] (start_kernel+0x468/0x490)
[  514.240000] Rebooting in 90 seconds..
[7.] A small shell script or example program which triggers the
     problem (if possible)
[8.] Environment
[8.1.] Software (add the output of the ver_linux script here)
Linux 4.19.16 #1 SMP Thu Mar 12 02:29:52 UTC 2020 armv7l armv7l armv7l GNU/Linux

Util-linux              226532
Mount                   226532
Module-init-tools       25
E2fsprogs               1.43.8
Nfs-utils               2.1.1
Linux C Library         2.27
Linux C++ Library       6.0.24
Procps                  3.3.12
Kbd                     2.0.4
Console-tools           2.0.4
Sh-utils                8.29
Udev                    237

Thanks
Sreeram

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