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Date:   Sat, 26 Dec 2020 15:25:14 -0800
From:   syzbot <syzbot+9d3ede723bdc58553f13@...kaller.appspotmail.com>
To:     adobriyan@...il.com, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org, longman@...hat.com,
        sfr@...b.auug.org.au, syzkaller-bugs@...glegroups.com,
        vvs@...tuozzo.com
Subject: BUG: unable to handle kernel NULL pointer dereference in call_rcu

Hello,

syzbot found the following issue on:

HEAD commit:    614cb589 Merge tag 'acpi-5.11-rc1-2' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10a82a50d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bf519e1e96191576
dashboard link: https://syzkaller.appspot.com/bug?extid=9d3ede723bdc58553f13
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11830e93500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13d92057500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9d3ede723bdc58553f13@...kaller.appspotmail.com

BUG: kernel NULL pointer dereference, address: 0000000000000008
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 2d993067 P4D 2d993067 PUD 19a3c067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3852 Comm: kworker/1:2 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events free_ipc
RIP: 0010:kasan_record_aux_stack+0x77/0xb0 mm/kasan/generic.c:341
Code: 48 f7 fe 8b 47 24 49 89 f0 48 29 d3 8d 70 ff 41 0f af f0 48 01 ce 48 39 f3 48 0f 46 f3 e8 81 e9 ff ff bf 00 08 00 00 48 89 c3 <8b> 40 08 89 43 0c e8 1e e6 ff ff 89 43 08 5b c3 48 8b 50 08 48 c7
RSP: 0018:ffffc90002e6fae8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888039800000
RDX: 0000000000000078 RSI: ffff888039800000 RDI: 0000000000000800
RBP: ffffffff837ef3a0 R08: 0000000000400000 R09: 000000000000002e
R10: ffffffff8132b7ea R11: 000000000000003f R12: 0000000000035b40
R13: ffff888039800088 R14: ffffc90002e6fc08 R15: 0000000000000200
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 0000000011841000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __call_rcu kernel/rcu/tree.c:2965 [inline]
 call_rcu+0xbb/0x710 kernel/rcu/tree.c:3038
 ipc_rcu_putref+0x83/0xb0 ipc/util.c:505
 freeary+0x139c/0x1b30 ipc/sem.c:1188
 free_ipcs+0x98/0x1e0 ipc/namespace.c:112
 sem_exit_ns+0x1b/0x40 ipc/sem.c:260
 free_ipc_ns ipc/namespace.c:124 [inline]
 free_ipc+0xf8/0x200 ipc/namespace.c:141
 process_one_work+0x98d/0x1630 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Modules linked in:
CR2: 0000000000000008
---[ end trace 28dc093e61d44dc2 ]---
RIP: 0010:kasan_record_aux_stack+0x77/0xb0 mm/kasan/generic.c:341
Code: 48 f7 fe 8b 47 24 49 89 f0 48 29 d3 8d 70 ff 41 0f af f0 48 01 ce 48 39 f3 48 0f 46 f3 e8 81 e9 ff ff bf 00 08 00 00 48 89 c3 <8b> 40 08 89 43 0c e8 1e e6 ff ff 89 43 08 5b c3 48 8b 50 08 48 c7
RSP: 0018:ffffc90002e6fae8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888039800000
RDX: 0000000000000078 RSI: ffff888039800000 RDI: 0000000000000800
RBP: ffffffff837ef3a0 R08: 0000000000400000 R09: 000000000000002e
R10: ffffffff8132b7ea R11: 000000000000003f R12: 0000000000035b40
R13: ffff888039800088 R14: ffffc90002e6fc08 R15: 0000000000000200
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 0000000011841000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

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