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 2965db2e004cf9c92b87c1f559e9812c0ae878c1
testing commit 2965db2e004cf9c92b87c1f559e9812c0ae878c1 with gcc (GCC) 8.4.1 20210217
kernel signature: ad4f90192254529db8c9e486e5441841b4d784663fb5e7d462e52822e7f7810b
all runs: crashed: WARNING in check_for_bios_corruption
revisions tested: 2, total time: 24m30.961512072s (build: 17m2.521004078s, test: 6m45.246532125s)
the crash still happens on HEAD
commit msg: Linux 4.19.188
crash: WARNING in check_for_bios_corruption
Corrupted low memory at 00000000d9e0e6d5 (2900 phys) = 000000e8
------------[ cut here ]------------
Memory corruption detected in low memory
WARNING: CPU: 1 PID: 19 at arch/x86/kernel/check.c:157 check_for_bios_corruption arch/x86/kernel/check.c:157 [inline]
WARNING: CPU: 1 PID: 19 at arch/x86/kernel/check.c:157 check_for_bios_corruption+0x10c/0x1d0 arch/x86/kernel/check.c:135
Modules linked in:
CPU: 1 PID: 19 Comm: kworker/1:0 Not tainted 4.19.188-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events check_corruption
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 36 ad a4 07 00 75 e7 48 c7 c7 20 59 e7 86 c6 05 26 ad a4 07 01 e8 85 78 48 05 <0f> 0b eb d0 48 89 df 89 55 d0 e8 e5 36 66 00 8b 55 d0 49 b8 00 00
RSP: 0018:ffff8881f5747d08 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff888000010000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff871f5f20 RDI: ffffffff89c8e6e0
RBP: ffff8881f5747d40 R08: ffffed103ed25079 R09: ffffed103ed25078
R10: ffffed103ed25078 R11: ffff8881f69283c7 R12: ffff888000010000
R13: dffffc0000000000 R14: 0000000000000001 R15: ffffffff890b00a0
FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004d2860 CR3: 000000000806d005 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 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
irq event stamp: 124724
hardirqs last  enabled at (124723): [<ffffffff86897567>] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
hardirqs last  enabled at (124723): [<ffffffff86897567>] _raw_spin_unlock_irq+0x27/0x80 kernel/locking/spinlock.c:192
hardirqs last disabled at (124724): [<ffffffff810050d0>] trace_hardirqs_off_thunk+0x1a/0x1c
softirqs last  enabled at (124704): [<ffffffff86c0062d>] __do_softirq+0x62d/0x919 kernel/softirq.c:318
softirqs last disabled at (124607): [<ffffffff813ab1cf>] invoke_softirq kernel/softirq.c:372 [inline]
softirqs last disabled at (124607): [<ffffffff813ab1cf>] irq_exit+0x17f/0x1c0 kernel/softirq.c:412
---[ end trace f860d4c2d10baaa7 ]---