general protection fault in do_syscall

general protection fault in do_syscall_64
Status: upstream: reported C repro on 2020/03/28 19:34
Reported-by: syzbot+f9b2c53f55a9270fc778@syzkaller.appspotmail.com
First crash: 87d, last: 36d

Cause bisection: the bug happens on the oldest tested release
Crash: WARNING in sysfs_warn_dup (log)
Repro: C syz .config

Fix bisection: failed (bisect log)

similar bugs (3):
Kernel	Title	Count	Last	Reported	Patched	Status
linux-4.19	general protection fault in do_syscall_64	6	15d	51d	0/1	upstream: reported on 2020/04/12 12:56
linux-4.14	general protection fault in do_syscall_64	1	217d	217d	0/1	auto-closed as invalid on 2020/02/26 05:52
linux-4.14	general protection fault in do_syscall_64 (2)	1	15d	15d	0/1	upstream: reported on 2020/05/18 23:19

Sample crash report:

general protection fault, probably for non-canonical address 0x1ffffffff1215a85: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 7207 Comm: syz-executor045 Not tainted 5.6.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:199 [inline]
RIP: 0010:do_syscall_64+0x5f/0x1b0 arch/x86/entry/common.c:289
Code: 48 c7 c7 28 d4 0a 89 e8 bf 5d b0 00 48 83 3d af 5b 0a 08 00 0f 84 58 01 00 00 fb 66 0f 1f 44 00 00 65 48 8b 1c 25 c0 1d 02 00 <48> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc90001617f28 EFLAGS: 00010282
RAX: 1ffffffff1215a85 RBX: ffff888095530380 RCX: ffff888095530380
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff888095530bc4
RBP: 0000000000000000 R08: ffffffff817a2210 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000023
R13: dffffc0000000000 R14: ffffc90001617f58 R15: 0000000000000000
FS:  0000000001333880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f87bf9aae78 CR3: 00000000a6a3f000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4454e1
Code: 75 14 b8 23 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 64 1f fc ff c3 48 83 ec 08 e8 9a 42 00 00 48 89 04 24 b8 23 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 e3 42 00 00 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffd72d164b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000023
RAX: ffffffffffffffda RBX: 000000000000000c RCX: 00000000004454e1
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffd72d164c0
RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffd72d164e0 R11: 0000000000000293 R12: 0000000000000000
R13: 00000000006dbc2c R14: 000000000000000a R15: 0000000000000000
Modules linked in:
---[ end trace 3da67f82bf6bae14 ]---
RIP: 0010:__read_once_size include/linux/compiler.h:199 [inline]
RIP: 0010:do_syscall_64+0x5f/0x1b0 arch/x86/entry/common.c:289
Code: 48 c7 c7 28 d4 0a 89 e8 bf 5d b0 00 48 83 3d af 5b 0a 08 00 0f 84 58 01 00 00 fb 66 0f 1f 44 00 00 65 48 8b 1c 25 c0 1d 02 00 <48> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc90001617f28 EFLAGS: 00010282
RAX: 1ffffffff1215a85 RBX: ffff888095530380 RCX: ffff888095530380
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff888095530bc4
RBP: 0000000000000000 R08: ffffffff817a2210 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000023
R13: dffffc0000000000 R14: ffffc90001617f58 R15: 0000000000000000
FS:  0000000001333880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f87bf9aae78 CR3: 00000000a6a3f000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (4):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci-upstream-kasan-gce-smack-root	2020/03/28 19:33	upstream	69c5eea3	f1ebdfba	.config	log	report	syz	C	bp@alien8.de, hpa@zytor.com, linux-kernel@vger.kernel.org, luto@kernel.org, mingo@redhat.com, tglx@linutronix.de, x86@kernel.org
ci-upstream-kasan-gce-smack-root	2020/03/20 16:03	upstream	6c90b86a	2c31c529	.config	log	report			bp@alien8.de, hpa@zytor.com, linux-kernel@vger.kernel.org, luto@kernel.org, mingo@redhat.com, tglx@linutronix.de, x86@kernel.org
ci-upstream-kasan-gce-smack-root	2020/03/10 02:06	upstream	30bb5572	35f53e45	.config	log	report			bp@alien8.de, hpa@zytor.com, linux-kernel@vger.kernel.org, luto@kernel.org, mingo@redhat.com, tglx@linutronix.de, x86@kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/03/07 15:47	linux-next	770fbb32	2e9971bb	.config	log	report			bp@alien8.de, hpa@zytor.com, linux-kernel@vger.kernel.org, luto@kernel.org, mingo@redhat.com, tglx@linutronix.de, x86@kernel.org