general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 6855 Comm: syz-executor.0 Not tainted 5.9.0-rc2-next-20200828-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:account_kernel_stack+0xaa/0x640 kernel/fork.c:384
Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e6 04 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5c 24 20 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 fb 04 00 00 4d 85 ed 4c 8b 23 0f 84 28 04 00 00
RSP: 0018:ffffc900055a7ae8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8144a06c
RDX: 0000000000000000 RSI: ffffffff81447d34 RDI: ffff888000100820
RBP: 00000000ffffffe0 R08: 0000000000000001 R09: ffff88804ac3374b
R10: 0000000000000080 R11: 0000000000000000 R12: ffff888000100800
R13: ffffffff812a8af0 R14: ffff888088d40300 R15: ffff88804ac33740
FS:  0000000001f21940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000400200 CR3: 000000008894d000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 release_task_stack kernel/fork.c:425 [inline]
 put_task_stack+0xdf/0x480 kernel/fork.c:437
 finish_task_switch+0x52a/0x760 kernel/sched/core.c:3649
 context_switch kernel/sched/core.c:3781 [inline]
 __schedule+0x8ed/0x21e0 kernel/sched/core.c:4527
 schedule+0xd0/0x2a0 kernel/sched/core.c:4602
 freezable_schedule include/linux/freezer.h:172 [inline]
 do_nanosleep+0x222/0x650 kernel/time/hrtimer.c:1883
 hrtimer_nanosleep+0x1f9/0x430 kernel/time/hrtimer.c:1936
 __do_sys_nanosleep kernel/time/hrtimer.c:1970 [inline]
 __se_sys_nanosleep kernel/time/hrtimer.c:1957 [inline]
 __x64_sys_nanosleep+0x1dc/0x260 kernel/time/hrtimer.c:1957
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ba81
Code: 75 14 b8 23 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 84 cf fb ff c3 48 83 ec 08 e8 ea 46 00 00 48 89 04 24 b8 23 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 33 47 00 00 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffef1c1edb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000023
RAX: ffffffffffffffda RBX: 00000000001654aa RCX: 000000000045ba81
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffef1c1edc0
RBP: 0000000000001467 R08: 0000000000000000 R09: 0000000001f21940
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000007
R13: 00007ffef1c1ee10 R14: 0000000000165477 R15: 00007ffef1c1ee20
Modules linked in:
---[ end trace 1d933299ff61f9c3 ]---
RIP: 0010:account_kernel_stack+0xaa/0x640 kernel/fork.c:384
Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e6 04 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5c 24 20 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 fb 04 00 00 4d 85 ed 4c 8b 23 0f 84 28 04 00 00
RSP: 0018:ffffc900055a7ae8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8144a06c
RDX: 0000000000000000 RSI: ffffffff81447d34 RDI: ffff888000100820
RBP: 00000000ffffffe0 R08: 0000000000000001 R09: ffff88804ac3374b
R10: 0000000000000080 R11: 0000000000000000 R12: ffff888000100800
R13: ffffffff812a8af0 R14: ffff888088d40300 R15: ffff88804ac33740
FS:  0000000001f21940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000400200 CR3: 000000008894d000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400