general protection fault in account_kernel_stack

[syzbot]

Hello,

syzkaller hit the following crash on
6084b576dca2e898f5c101baef151f7bfdbb606d
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.

Unfortunately, I don't have any reproducer for this bug yet.


general protection fault: 0000 [#1] SMP
Dumping ftrace buffer:
(ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.15.0-rc3-next-20171214+ #67
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:account_kernel_stack+0x65/0x250 kernel/fork.c:325
RSP: 0018:ffffffff83003d78 EFLAGS: 00010202
RAX: 7974697275636573 RBX: 0000000000000008 RCX: ffffffff811bddb3
RDX: 0000000000000000 RSI: 0000000000000009 RDI: ffff8801fcaba3c0
RBP: ffffffff83003da0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801fc4f7080
R13: 00000000ffffffff R14: fffffffffffffffc R15: ffffffff831da500
FS: 0000000000000000(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f394384e000 CR3: 000000000301e006 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
release_task_stack kernel/fork.c:353 [inline]
put_task_stack+0x4b/0x160 kernel/fork.c:366
finish_task_switch+0x1c3/0x210 kernel/sched/core.c:2684
context_switch kernel/sched/core.c:2803 [inline]
__schedule+0x313/0xaf0 kernel/sched/core.c:3376
schedule_idle+0x1d/0x40 kernel/sched/core.c:3462
do_idle+0xc3/0x220 kernel/sched/idle.c:269
cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351
rest_init+0xc7/0xd0 init/main.c:436
start_kernel+0x52b/0x53a init/main.c:717
x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378
x86_64_start_kernel+0x72/0x75 arch/x86/kernel/head64.c:359
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237
Code: 63 f5 31 db 49 c7 c7 00 a5 1d 83 49 c1 e6 02 e8 92 c5 0f 00 e8 8d c5
0f 00 49 8b 44 24 20 be 09 00 00 00 48 8b 04 18 48 83 c3 08 <48> 8b 00 48
89 c2 48 c1 e8 38 83 e0 03 48 c1 ea 3a 48 8d 0c 80
RIP: account_kernel_stack+0x65/0x250 kernel/fork.c:325 RSP: ffffffff83003d78
---[ end trace 2da2af88eb409afc ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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[Dmitry Vyukov]

old bug bankruptcy

#syz invalid

On Thu, Dec 21, 2017 at 6:00 PM, syzbot
<bot+09f3ae886f3c61c56b...@syzkaller.appspotmail.com>
wrote:

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