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Message-ID: <0000000000008b056305e6b5e93a@google.com>
Date: Sat, 20 Aug 2022 18:04:25 -0700
From: syzbot <syzbot+6927c4059ebce5111574@...kaller.appspotmail.com>
To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com, tj@...nel.org
Subject: [syzbot] upstream boot error: BUG: unable to handle kernel NULL
pointer dereference in qlist_free_all
Hello,
syzbot found the following issue on:
HEAD commit: 3cc40a443a04 Merge tag 'nios2_fixes_v6.0' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10938a47080000
kernel config: https://syzkaller.appspot.com/x/.config?x=e706e91b2a433db
dashboard link: https://syzkaller.appspot.com/bug?extid=6927c4059ebce5111574
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6927c4059ebce5111574@...kaller.appspotmail.com
BUG: kernel NULL pointer dereference, address: 0000000000000018
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 2972 Comm: udevadm Not tainted 6.0.0-rc1-syzkaller-00017-g3cc40a443a04 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:qlink_to_cache mm/kasan/quarantine.c:131 [inline]
RIP: 0010:qlist_free_all+0x13b/0x1b0 mm/kasan/quarantine.c:184
Code: ff ff 48 c1 e5 06 48 01 c5 48 8b 45 08 a8 01 75 79 66 90 48 89 ef e8 84 fe ff ff 48 8b 00 f6 c4 02 b8 00 00 00 00 48 0f 44 e8 <4c> 8b 7d 18 e9 39 ff ff ff 48 8b 04 24 48 c7 40 08 00 00 00 00 48
RSP: 0018:ffffc900030afc28 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888000006301 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8136e5f4 RDI: ffffea0000000180
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88801bde3000 R14: ffff88801bde3000 R15: 0000000000000000
FS: 00007fb5f1aa9840(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000018 CR3: 000000007cefe000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x97/0xb0 mm/kasan/common.c:447
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:727 [inline]
slab_alloc mm/slab.c:3294 [inline]
__do_kmalloc mm/slab.c:3684 [inline]
__kmalloc+0x315/0x4a0 mm/slab.c:3695
kmalloc include/linux/slab.h:605 [inline]
kernfs_fop_write_iter+0x231/0x610 fs/kernfs/file.c:331
call_write_iter include/linux/fs.h:2187 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x9e9/0xdd0 fs/read_write.c:578
ksys_write+0x127/0x250 fs/read_write.c:631
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fb5f17259a3
Code: 8b 15 d9 f4 0c 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 48 89 54 24 18
RSP: 002b:00007fff80b14e48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fff80b16f41 RCX: 00007fb5f17259a3
RDX: 0000000000000003 RSI: 00007fff80b16f41 RDI: 0000000000000003
RBP: 000055910f241e30 R08: 0000000000000000 R09: 00007fb5f17f5a60
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007fff80b14e58 R14: 0000000000000000 R15: 000055910e4de0b4
</TASK>
Modules linked in:
CR2: 0000000000000018
---[ end trace 0000000000000000 ]---
RIP: 0010:qlink_to_cache mm/kasan/quarantine.c:131 [inline]
RIP: 0010:qlist_free_all+0x13b/0x1b0 mm/kasan/quarantine.c:184
Code: ff ff 48 c1 e5 06 48 01 c5 48 8b 45 08 a8 01 75 79 66 90 48 89 ef e8 84 fe ff ff 48 8b 00 f6 c4 02 b8 00 00 00 00 48 0f 44 e8 <4c> 8b 7d 18 e9 39 ff ff ff 48 8b 04 24 48 c7 40 08 00 00 00 00 48
RSP: 0018:ffffc900030afc28 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888000006301 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8136e5f4 RDI: ffffea0000000180
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88801bde3000 R14: ffff88801bde3000 R15: 0000000000000000
FS: 00007fb5f1aa9840(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000018 CR3: 000000007cefe000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
0: ff 48 c1 decl -0x3f(%rax)
3: e5 06 in $0x6,%eax
5: 48 01 c5 add %rax,%rbp
8: 48 8b 45 08 mov 0x8(%rbp),%rax
c: a8 01 test $0x1,%al
e: 75 79 jne 0x89
10: 66 90 xchg %ax,%ax
12: 48 89 ef mov %rbp,%rdi
15: e8 84 fe ff ff callq 0xfffffe9e
1a: 48 8b 00 mov (%rax),%rax
1d: f6 c4 02 test $0x2,%ah
20: b8 00 00 00 00 mov $0x0,%eax
25: 48 0f 44 e8 cmove %rax,%rbp
* 29: 4c 8b 7d 18 mov 0x18(%rbp),%r15 <-- trapping instruction
2d: e9 39 ff ff ff jmpq 0xffffff6b
32: 48 8b 04 24 mov (%rsp),%rax
36: 48 c7 40 08 00 00 00 movq $0x0,0x8(%rax)
3d: 00
3e: 48 rex.W
---
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.
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