On Mon, Oct 21, 2024 at 6:48 PM syzbot <syzbot+985ada84bf055a575c07@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > syzbot has found a reproducer for the following issue on: > > HEAD commit: 42f7652d3eb5 Linux 6.12-rc4 > git tree: upstream > console+strace: https://syzkaller.appspot.com/x/log.txt?x=10c66a40580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=41330fd2db03893d > dashboard link: https://syzkaller.appspot.com/bug?extid=985ada84bf055a575c07 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1541e430580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1181e0a7980000 The kernel bug reproduced by this C-reproducer is fixed by the patch "nilfs2: fix kernel bug due to missing clearing of buffer delay flag" on the way upstream. I actually performed a follow-up test of this C-reproducer and confirmed it. This should be closed by the patch, so although there are additional messages sent by syzbot, I will leave it without closing it manually. Ryusuke Konishi > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/21f56ec05989/disk-42f7652d.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/d295ea00e68a/vmlinux-42f7652d.xz > kernel image: https://storage.googleapis.com/syzbot-assets/6c4b95c7f67f/bzImage-42f7652d.xz > mounted in repro #1: https://storage.googleapis.com/syzbot-assets/709e6e32762f/mount_0.gz > mounted in repro #2: https://storage.googleapis.com/syzbot-assets/6576d8861c23/mount_7.gz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+985ada84bf055a575c07@xxxxxxxxxxxxxxxxxxxxxxxxx > > ------------[ cut here ]------------ > kernel BUG at fs/buffer.c:2785! > Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI > CPU: 0 UID: 0 PID: 5235 Comm: syz-executor372 Not tainted 6.12.0-rc4-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 > RIP: 0010:submit_bh_wbc+0x556/0x560 fs/buffer.c:2785 > Code: 89 fa e8 dd 76 cc 02 e9 95 fe ff ff e8 73 85 74 ff 90 0f 0b e8 6b 85 74 ff 90 0f 0b e8 63 85 74 ff 90 0f 0b e8 5b 85 74 ff 90 <0f> 0b e8 53 85 74 ff 90 0f 0b 90 90 90 90 90 90 90 90 90 90 90 90 > RSP: 0018:ffffc90003b6f0d8 EFLAGS: 00010293 > RAX: ffffffff82206235 RBX: 0000000000000154 RCX: ffff88802d490000 > RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000 > RBP: 0000000000000100 R08: ffffffff82205df9 R09: 1ffff1100ef571d0 > R10: dffffc0000000000 R11: ffffed100ef571d1 R12: 0000000000000000 > R13: ffff888077ab8e80 R14: 0000000000000000 R15: 1ffff1100ef571d0 > FS: 0000555573f7e380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fbda422e00a CR3: 000000002fc1e000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > submit_bh fs/buffer.c:2824 [inline] > block_read_full_folio+0x93b/0xcd0 fs/buffer.c:2451 > do_mpage_readpage+0x1a73/0x1c80 fs/mpage.c:317 > mpage_read_folio+0x108/0x1e0 fs/mpage.c:392 > filemap_read_folio+0x14b/0x630 mm/filemap.c:2367 > do_read_cache_folio+0x3f5/0x850 mm/filemap.c:3825 > read_mapping_folio include/linux/pagemap.h:1011 [inline] > nilfs_get_folio+0x4b/0x240 fs/nilfs2/dir.c:190 > nilfs_find_entry+0x13d/0x660 fs/nilfs2/dir.c:313 > nilfs_inode_by_name+0xad/0x240 fs/nilfs2/dir.c:394 > nilfs_lookup+0xed/0x210 fs/nilfs2/namei.c:63 > lookup_open fs/namei.c:3573 [inline] > open_last_lookups fs/namei.c:3694 [inline] > path_openat+0x11a7/0x3590 fs/namei.c:3930 > do_filp_open+0x235/0x490 fs/namei.c:3960 > do_sys_openat2+0x13e/0x1d0 fs/open.c:1415 > do_sys_open fs/open.c:1430 [inline] > __do_sys_openat fs/open.c:1446 [inline] > __se_sys_openat fs/open.c:1441 [inline] > __x64_sys_openat+0x247/0x2a0 fs/open.c:1441 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fbda41e54a9 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffe5e610168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fbda41e54a9 > RDX: 000000000000275a RSI: 0000000020000180 RDI: 00000000ffffff9c > RBP: 0000000000000000 R08: 00000000000051a5 R09: 000000002000a440 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe5e61019c > R13: 0000000000000007 R14: 431bde82d7b634db R15: 00007ffe5e6101d0 > </TASK> > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:submit_bh_wbc+0x556/0x560 fs/buffer.c:2785 > Code: 89 fa e8 dd 76 cc 02 e9 95 fe ff ff e8 73 85 74 ff 90 0f 0b e8 6b 85 74 ff 90 0f 0b e8 63 85 74 ff 90 0f 0b e8 5b 85 74 ff 90 <0f> 0b e8 53 85 74 ff 90 0f 0b 90 90 90 90 90 90 90 90 90 90 90 90 > RSP: 0018:ffffc90003b6f0d8 EFLAGS: 00010293 > RAX: ffffffff82206235 RBX: 0000000000000154 RCX: ffff88802d490000 > RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000 > RBP: 0000000000000100 R08: ffffffff82205df9 R09: 1ffff1100ef571d0 > R10: dffffc0000000000 R11: ffffed100ef571d1 R12: 0000000000000000 > R13: ffff888077ab8e80 R14: 0000000000000000 R15: 1ffff1100ef571d0 > FS: 0000555573f7e380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fbd9cbff000 CR3: 000000002fc1e000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > --- > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing.
