general protection fault in wait_consider

general protection fault in wait_consider_task
Status: upstream: reported on 2020/04/21 19:37
Reported-by: syzbot+c3b604da907fb0eb2466@syzkaller.appspotmail.com
First crash: 116d, last: 36d

similar bugs (2):
Kernel	Title	Repro	Bisected	Count	Last	Reported	Patched	Status
linux-4.14	general protection fault in wait_consider_task			2	98d	124d	0/1	upstream: reported on 2020/04/10 00:59
linux-4.19	general protection fault in wait_consider_task	C	fix	5	318d	324d	1/1	fixed on 2019/12/10 03:52

Sample crash report:

general protection fault, probably for non-canonical address 0xe000ea00000000e4: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0x0007700000000720-0x0007700000000727]
CPU: 1 PID: 7433 Comm: syz-executor.5 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:same_thread_group include/linux/sched/signal.h:660 [inline]
RIP: 0010:ptrace_reparented include/linux/ptrace.h:99 [inline]
RIP: 0010:wait_consider_task+0x1ea1/0x3b20 kernel/exit.c:1301
Code: 03 80 3c 02 00 0f 85 f2 14 00 00 4d 8b ae e8 04 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bd 20 07 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 bf 14 00 00 48 8d bb 20 07 00 00 4d 8b ad 20 07
RSP: 0018:ffffc9000875fb18 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8145cfed
RDX: 0000ee00000000e4 RSI: ffffffff8145eaa7 RDI: 0007700000000720
RBP: ffffc9000875fd1c R08: 0000000000000001 R09: ffffffff89a09083
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0007700000000000 R14: ffff88800016c180 R15: ffff88800016c5f4
FS:  00000000027ea940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeff3bae78 CR3: 0000000053777000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_wait_thread kernel/exit.c:1378 [inline]
 do_wait+0x36a/0x9e0 kernel/exit.c:1449
 kernel_wait4+0x14c/0x260 kernel/exit.c:1621
 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1633
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4169ca
Code: Bad RIP value.
RSP: 002b:0000000000c9fda8 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 00000000002499a8 RCX: 00000000004169ca
RDX: 0000000040000001 RSI: 0000000000c9fde0 RDI: ffffffffffffffff
RBP: 0000000000002a34 R08: 0000000000000001 R09: 00000000027ea940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000c9fde0 R14: 0000000000249980 R15: 0000000000c9fdf0
Modules linked in:
---[ end trace de7524b82d215f9a ]---
RIP: 0010:same_thread_group include/linux/sched/signal.h:660 [inline]
RIP: 0010:ptrace_reparented include/linux/ptrace.h:99 [inline]
RIP: 0010:wait_consider_task+0x1ea1/0x3b20 kernel/exit.c:1301
Code: 03 80 3c 02 00 0f 85 f2 14 00 00 4d 8b ae e8 04 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bd 20 07 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 bf 14 00 00 48 8d bb 20 07 00 00 4d 8b ad 20 07
RSP: 0018:ffffc9000875fb18 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8145cfed
RDX: 0000ee00000000e4 RSI: ffffffff8145eaa7 RDI: 0007700000000720
RBP: ffffc9000875fd1c R08: 0000000000000001 R09: ffffffff89a09083
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0007700000000000 R14: ffff88800016c180 R15: ffff88800016c5f4
FS:  00000000027ea940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeff3bae78 CR3: 0000000053777000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (2):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci-upstream-kasan-gce	2020/07/06 15:43	upstream	7cc2a8ea	51095195	.config	log	report			christian@brauner.io, ebiederm@xmission.com, jannh@google.com, linux-kernel@vger.kernel.org, mingo@kernel.org, oleg@redhat.com, peterz@infradead.org, tglx@linutronix.de
ci-upstream-kasan-gce-smack-root	2020/04/17 18:54	upstream	7a56db02	18397578	.config	log	report			christian@brauner.io, ebiederm@xmission.com, linux-kernel@vger.kernel.org, mingo@kernel.org, oleg@redhat.com, peterz@infradead.org, tglx@linutronix.de