BUG: unable to handle kernel NULL pointer dereference in do_syscall

BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 (2)
Status: closed as dup on 2020/08/15 13:48
Reported-by: syzbot+d6d57d324860c94d5836@syzkaller.appspotmail.com
First crash: 569d, last: 460d

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

Duplicate of (1):
Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported
general protection fault in syscall_return_slowpath	syz	inconclusive	done	1	477d	563d

similar bugs (6):
Kernel	Title	Repro	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.19	BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 (2)	C	done	4	415d	428d	1/1	fixed on 2020/09/03 09:58
linux-4.19	BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 (3)			2	376d	381d	0/1	auto-closed as invalid on 2021/01/09 06:14
upstream	BUG: unable to handle kernel NULL pointer dereference in do_syscall_64			2	1191d	1191d	0/22	auto-closed as invalid on 2019/02/22 10:29
linux-4.14	BUG: unable to handle kernel NULL pointer dereference in do_syscall_64			1	691d	691d	0/1	auto-closed as invalid on 2020/02/28 23:04
linux-4.14	BUG: unable to handle kernel NULL pointer dereference in do_syscall_64 (2)			7	490d	527d	0/1	auto-closed as invalid on 2020/09/17 05:58
linux-4.19	BUG: unable to handle kernel NULL pointer dereference in do_syscall_64			3	556d	571d	0/1	auto-closed as invalid on 2020/07/13 07:25

Sample crash report:

IPVS: ftp: loaded support on port[0] = 21
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 962b6067 P4D 962b6067 PUD 9441e067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 7058 Comm: syz-executor367 Not tainted 5.6.0-next-20200406-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 7d 50 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80
RSP: 0018:ffffc90001657f28 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000023 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8163ea3d RDI: 0000000000000282
RBP: ffffc90001657f58 R08: ffff8880a9156440 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff89949570 R14: 0000000000000000 R15: 0000000000000000
FS:  00000000015f5940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000962b7000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x4464b0
Code: c0 5b 5d c3 66 0f 1f 44 00 00 8b 04 24 48 83 c4 18 5b 5d c3 66 0f 1f 44 00 00 83 3d 61 cb 29 00 00 75 14 b8 23 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 84 20 fc ff c3 48 83 ec 08 e8 5a 43 00 00
RSP: 002b:00007fffeb3290d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000023
RAX: ffffffffffffffda RBX: 00007fffeb329140 RCX: 00000000004464b0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fffeb3290e0
RBP: 0000000000000002 R08: 0000000000000001 R09: 00000000015f5940
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000fb38
R13: 0000000000408a50 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
CR2: 0000000000000000
---[ end trace 07b78701f72ec477 ]---
RIP: 0010:do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 7d 50 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80
RSP: 0018:ffffc90001657f28 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000023 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8163ea3d RDI: 0000000000000282
RBP: ffffc90001657f58 R08: ffff8880a9156440 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff89949570 R14: 0000000000000000 R15: 0000000000000000
FS:  00000000015f5940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000962b7000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (9):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro
ci-upstream-linux-next-kasan-gce-root	2020/04/07 00:24	linux-next	b2e2a818a017	99a96044	.config	log	report	syz	C
ci-qemu-upstream	2020/06/19 01:41	upstream	435faf5c218a	bc258b50	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/05/18 20:16	upstream	45088963ca9c	684d3606	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/05/18 02:14	upstream	b9bbe6ed63b2	37bccd4e	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/05/16 01:50	upstream	12bf0b632ed0	37bccd4e	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/05/13 15:30	upstream	24085f70a6e1	9a6d42fb	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/04/19 11:40	upstream	50cc09c18985	6dfd45e1	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/04/19 03:51	upstream	50cc09c18985	365fba24	.config	log	report
ci-upstream-kasan-gce	2020/03/02 00:18	upstream	63623fd44972	c88c7b75	.config	log	report