bisecting fixing commit since dafd634415a7f9892a6fcc99c540fe567ab42c92
building syzkaller on 2f661ec405cb3975128e9851c7a5979d92d001f1
testing commit dafd634415a7f9892a6fcc99c540fe567ab42c92 with gcc (GCC) 8.4.1 20210217
kernel signature: a87c31af49afe0b34038a75c44ccbb6b04f1bb05d64d48e99a5451e07ea52837
all runs: crashed: WARNING in check_for_bios_corruption
testing current HEAD 255b58a2b3af0baa0ee11507390349217b8b73b0
testing commit 255b58a2b3af0baa0ee11507390349217b8b73b0 with gcc (GCC) 8.4.1 20210217
kernel signature: 3ca57a32ad3fed69f65eabd60515123ce7d964fdcc364aa160f8a7b95086f3f3
all runs: crashed: WARNING in check_for_bios_corruption
revisions tested: 2, total time: 22m30.689648172s (build: 14m55.876971382s, test: 6m35.659317482s)
the crash still happens on HEAD
commit msg: Linux 4.19.176
crash: WARNING in check_for_bios_corruption
8021q: adding VLAN 0 to HW filter on device batadv0
Corrupted low memory at 00000000c616ce7b (2900 phys) = 000000e8
------------[ cut here ]------------
Memory corruption detected in low memory
WARNING: CPU: 0 PID: 5 at arch/x86/kernel/check.c:157 check_for_bios_corruption arch/x86/kernel/check.c:157 [inline]
WARNING: CPU: 0 PID: 5 at arch/x86/kernel/check.c:157 check_for_bios_corruption+0x10c/0x1d0 arch/x86/kernel/check.c:135
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 4.19.176-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:77 [inline]
 dump_stack+0x123/0x171 lib/dump_stack.c:118
 panic+0x1cd/0x375 kernel/panic.c:186
 __warn.cold.8+0x1b/0x36 kernel/panic.c:541
 report_bug+0x1a1/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x200/0x350 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:check_for_bios_corruption arch/x86/kernel/check.c:157 [inline]
RIP: 0010:check_for_bios_corruption+0x10c/0x1d0 arch/x86/kernel/check.c:135
Code: c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 c3 80 3d b3 97 a4 07 00 75 e7 48 c7 c7 80 58 e7 86 c6 05 a3 97 a4 07 01 e8 5c 2d 47 05 <0f> 0b eb d0 48 89 df 89 55 d0 e8 85 29 66 00 8b 55 d0 49 b8 00 00
RSP: 0018:ffff8881f569fd08 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff888000010000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff871f48e0 RDI: ffffffff89c8b6e0
RBP: ffff8881f569fd40 R08: ffffed103ed05079 R09: ffffed103ed05078
R10: ffffed103ed05078 R11: ffff8881f68283c7 R12: ffff888000010000
R13: dffffc0000000000 R14: 0000000000000001 R15: ffffffff890ad0a0
 check_corruption+0xd/0x70 arch/x86/kernel/check.c:165
 process_one_work+0x830/0x1670 kernel/workqueue.c:2152
 worker_thread+0x85/0xb60 kernel/workqueue.c:2295
 kthread+0x347/0x410 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Kernel Offset: disabled
Rebooting in 86400 seconds..