bisecting fixing commit since f6e27dbb1afabcba436e346d6aa88a592a1436bb
building syzkaller on 2f1548bc77986e756b536eaa15726b483a0b1858
testing commit f6e27dbb1afabcba436e346d6aa88a592a1436bb with gcc (GCC) 8.1.0
kernel signature: 77cff8702aebb0b29e238275b283dadc65a08a9f
all runs: crashed: WARNING in check_for_bios_corruption
testing current HEAD 84f5ad468100f86d70096799e4ee716a17c2962f
testing commit 84f5ad468100f86d70096799e4ee716a17c2962f with gcc (GCC) 8.1.0
kernel signature: 9ec68952717a77994f8c3c4ac9d299fbf091b6e7
all runs: crashed: WARNING in check_for_bios_corruption
revisions tested: 2, total time: 32m58.340910703s (build: 16m35.404867358s, test: 15m36.1539889s)
the crash still happens on HEAD
commit msg: Linux 4.14.162
crash: WARNING in check_for_bios_corruption
Corrupted low memory at ffff888000003fe8 (3fe8 phys) = ffffffffffffffff
Corrupted low memory at ffff888000003ff0 (3ff0 phys) = ffffffffffffffff
Corrupted low memory at ffff888000003ff8 (3ff8 phys) = ffffffffffffffff
Memory corruption detected in low memory
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6646 at arch/x86/kernel/check.c:157 check_for_bios_corruption.cold.2+0x13/0x1e arch/x86/kernel/check.c:157
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6646 Comm: kworker/0:2 Not tainted 4.14.162-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events check_corruption
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xf7/0x13b lib/dump_stack.c:58
 panic+0x1b0/0x358 kernel/panic.c:183
 __warn.cold.8+0x25/0x2c kernel/panic.c:547
 report_bug+0x1a4/0x1f3 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 do_error_trap+0x1bd/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963
RIP: 0010:check_for_bios_corruption.cold.2+0x13/0x1e arch/x86/kernel/check.c:157
RSP: 0018:ffff88809fe57d10 EFLAGS: 00010282
RAX: 0000000000000028 RBX: ffff888000010000 RCX: 0000000000000000
RDX: 0000000000000028 RSI: ffff88809c7e2de8 RDI: ffffed1013fcaf99
RBP: ffff88809fe57d48 R08: ffff88809c7e2e08 R09: 0000000000000000
R10: 0000000000000000 R11: dffffc0000000000 R12: ffff888000010000
R13: dffffc0000000000 R14: 0000000000000001 R15: ffffffff887a45c0
 check_corruption+0xd/0x63 arch/x86/kernel/check.c:165
 process_one_work+0x79e/0x16c0 kernel/workqueue.c:2114
 worker_thread+0xcc/0xee0 kernel/workqueue.c:2248
 kthread+0x338/0x400 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Kernel Offset: disabled
Rebooting in 86400 seconds..