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Message-ID: <00000000000097c20205ebaea3d6@google.com>
Date: Sun, 23 Oct 2022 00:29:45 -0700
From: syzbot <syzbot+ebe05ee8e98f755f61d0@...kaller.appspotmail.com>
To: konishi.ryusuke@...il.com, linux-kernel@...r.kernel.org,
linux-nilfs@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] general protection fault in nilfs_palloc_commit_free_entry
Hello,
syzbot found the following issue on:
HEAD commit: 440b7895c990 Merge tag 'mm-hotfixes-stable-2022-10-20' of ..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=17d3b33c880000
kernel config: https://syzkaller.appspot.com/x/.config?x=afc317c0f52ce670
dashboard link: https://syzkaller.appspot.com/bug?extid=ebe05ee8e98f755f61d0
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15d81572880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=162b0a36880000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/105038975fc9/disk-440b7895.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/edd7302c8fc8/vmlinux-440b7895.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/6a01cad872ec/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ebe05ee8e98f755f61d0@...kaller.appspotmail.com
NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 1 PID: 3613 Comm: segctord Not tainted 6.1.0-rc1-syzkaller-00158-g440b7895c990 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
RIP: 0010:nilfs_palloc_commit_free_entry+0xd2/0x570 fs/nilfs2/alloc.c:608
Code: 08 4c 89 f8 48 c1 e8 03 48 89 44 24 18 42 80 3c 20 00 74 08 4c 89 ff e8 4c 36 8b fe 49 8b 2f 48 83 c5 10 48 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 ef e8 2f 36 8b fe 48 8b 45 00 48 89 44
RSP: 0018:ffffc90003d8f280 EFLAGS: 00010202
RAX: 0000000000000002 RBX: 1ffff1100e5b4044 RCX: 0000000000002000
RDX: 0000000000001801 RSI: 000000000000000a RDI: 000000000000003d
RBP: 0000000000000010 R08: ffffffff835085a5 R09: ffffed100e093a2a
R10: ffffed100e093a2a R11: 1ffff1100e093a29 R12: dffffc0000000000
R13: 0000000000002000 R14: ffff888072da0222 R15: ffff88802435cba0
FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa887c6b1d0 CR3: 000000000c88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
nilfs_dat_commit_update+0x25/0x40 fs/nilfs2/dat.c:236
nilfs_btree_commit_update_v+0x91/0x420 fs/nilfs2/btree.c:1940
nilfs_btree_commit_propagate_v fs/nilfs2/btree.c:2016 [inline]
nilfs_btree_propagate_v fs/nilfs2/btree.c:2046 [inline]
nilfs_btree_propagate+0x972/0xe10 fs/nilfs2/btree.c:2088
nilfs_bmap_propagate+0x6d/0x120 fs/nilfs2/bmap.c:337
nilfs_collect_file_data+0x49/0xc0 fs/nilfs2/segment.c:568
nilfs_segctor_apply_buffers+0x192/0x380 fs/nilfs2/segment.c:1018
nilfs_segctor_scan_file+0x842/0xaf0 fs/nilfs2/segment.c:1067
nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1197 [inline]
nilfs_segctor_collect fs/nilfs2/segment.c:1503 [inline]
nilfs_segctor_do_construct+0x1d2c/0x6f80 fs/nilfs2/segment.c:2045
nilfs_segctor_construct+0x143/0x8d0 fs/nilfs2/segment.c:2379
nilfs_segctor_thread_construct fs/nilfs2/segment.c:2487 [inline]
nilfs_segctor_thread+0x59e/0x11c0 fs/nilfs2/segment.c:2570
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:nilfs_palloc_commit_free_entry+0xd2/0x570 fs/nilfs2/alloc.c:608
Code: 08 4c 89 f8 48 c1 e8 03 48 89 44 24 18 42 80 3c 20 00 74 08 4c 89 ff e8 4c 36 8b fe 49 8b 2f 48 83 c5 10 48 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 ef e8 2f 36 8b fe 48 8b 45 00 48 89 44
RSP: 0018:ffffc90003d8f280 EFLAGS: 00010202
RAX: 0000000000000002 RBX: 1ffff1100e5b4044 RCX: 0000000000002000
RDX: 0000000000001801 RSI: 000000000000000a RDI: 000000000000003d
RBP: 0000000000000010 R08: ffffffff835085a5 R09: ffffed100e093a2a
R10: ffffed100e093a2a R11: 1ffff1100e093a29 R12: dffffc0000000000
R13: 0000000000002000 R14: ffff888072da0222 R15: ffff88802435cba0
FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa887c6b1d0 CR3: 000000000c88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 08 4c 89 f8 or %cl,-0x8(%rcx,%rcx,4)
4: 48 c1 e8 03 shr $0x3,%rax
8: 48 89 44 24 18 mov %rax,0x18(%rsp)
d: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1)
12: 74 08 je 0x1c
14: 4c 89 ff mov %r15,%rdi
17: e8 4c 36 8b fe callq 0xfe8b3668
1c: 49 8b 2f mov (%r15),%rbp
1f: 48 83 c5 10 add $0x10,%rbp
23: 48 89 e8 mov %rbp,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 48 89 ef mov %rbp,%rdi
34: e8 2f 36 8b fe callq 0xfe8b3668
39: 48 8b 45 00 mov 0x0(%rbp),%rax
3d: 48 rex.W
3e: 89 .byte 0x89
3f: 44 rex.R
---
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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