While building (and sometimes while installing the build) I can reliably crash
the kernel, here is the info & backtrace from crash(1):
> crash /usr/lib/debug/boot/vmlinux-5.6.6-1-default.debug /boot/vmlinux-5.6.6-1-default.xz /var/crash/2020-04-29-14\:30/vmcore
crash 7.2.8
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"x86_64-unknown-linux-gnu"...
WARNING: kernel relocated [646MB]: patching 113108 gdb minimal_symbol values
KERNEL: /boot/vmlinux-5.6.6-1-default.xz
DEBUGINFO: /usr/lib/debug/boot/vmlinux-5.6.6-1-default.debug
DUMPFILE: /var/crash/2020-04-29-14:30/vmcore [PARTIAL DUMP]
CPUS: 8
DATE: Wed Apr 29 14:30:45 2020
UPTIME: 01:23:51
LOAD AVERAGE: 10.83, 10.31, 10.11
TASKS: 273
NODENAME: havana
RELEASE: 5.6.6-1-default
VERSION: #1 SMP Wed Apr 22 04:15:55 UTC 2020 (c11f000)
MACHINE: x86_64 (3491 Mhz)
MEMORY: 15.9 GB
PANIC: "kernel BUG at mm/filemap.c:1318!"
PID: 170
COMMAND: "kworker/4:1"
TASK: ffff97e5c73b9ec0 [THREAD_INFO: ffff97e5c73b9ec0]
CPU: 4
STATE: TASK_RUNNING (PANIC)
crash> bt
PID: 170 TASK: ffff97e5c73b9ec0 CPU: 4 COMMAND: "kworker/4:1"
#0 [ffffb12f80507af0] machine_kexec at ffffffffa966dce1
#1 [ffffb12f80507b48] __crash_kexec at ffffffffa974f9fd
#2 [ffffb12f80507c10] crash_kexec at ffffffffa9750795
#3 [ffffb12f80507c20] oops_end at ffffffffa9634ed2
#4 [ffffb12f80507c40] do_trap at ffffffffa963149b
#5 [ffffb12f80507c90] do_invalid_op at ffffffffa9631ee7
#6 [ffffb12f80507cb0] invalid_op at ffffffffaa000d68
[exception RIP: end_page_writeback+95]
RIP: ffffffffa9819e4f RSP: ffffb12f80507d68 RFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff97e5c42e0d48 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff97e8effe7000 RDI: 0000000000000000
RBP: ffffd4df47f80a80 R8: 0000000000000001 R9: ffff97e8effe7000
R10: 00000000000353c0 R11: ffffffffffffffc0 R12: 0000000000000000
R13: 0000000000000000 R14: ffff97e892522180 R15: ffffd4df47f80a80
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0000
#7 [ffffb12f80507d70] iomap_finish_ioend at ffffffffa996125e
#8 [ffffb12f80507dd8] iomap_finish_ioends at ffffffffa9961393
#9 [ffffb12f80507e08] xfs_end_ioend at ffffffffc08a646d [xfs]
#10 [ffffb12f80507e40] xfs_end_io at ffffffffc08a6fdc [xfs]
#11 [ffffb12f80507e78] process_one_work at ffffffffa96b9433
#12 [ffffb12f80507eb8] worker_thread at ffffffffa96b964d
#13 [ffffb12f80507f10] kthread at ffffffffa96bfd09
#14 [ffffb12f80507f50] ret_from_fork at ffffffffaa0001ff
Let me know if I can provide more information.