syzbot has found a reproducer for the following issue on: HEAD commit: 2f87d0916ce0 Merge tag 'trace-ringbuffer-v6.12-rc3' of git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1773b727980000 kernel config: https://syzkaller.appspot.com/x/.config?x=cfbd94c114a3d407 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=10015030580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-2f87d091.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2704ba6867a8/vmlinux-2f87d091.xz kernel image: https://storage.googleapis.com/syzbot-assets/9f7121fd532b/bzImage-2f87d091.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/51d4ae79614c/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+985ada84bf055a575c07@xxxxxxxxxxxxxxxxxxxxxxxxx NILFS error (device loop0): nilfs_check_folio: bad entry in directory #12: rec_len is smaller than minimal - offset=0, inode=0, rec_len=0, name_len=0 NILFS (loop0): unable to write superblock: err=-5 Remounting filesystem read-only NILFS error (device loop0): nilfs_readdir: bad page in #12 ------------[ cut here ]------------ kernel BUG at fs/buffer.c:2785! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5210 Comm: syz-executor Not tainted 6.12.0-rc3-syzkaller-00044-g2f87d0916ce0 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:submit_bh_wbc+0x556/0x560 fs/buffer.c:2785 Code: 89 fa e8 1d d9 d1 02 e9 95 fe ff ff e8 f3 72 71 ff 90 0f 0b e8 eb 72 71 ff 90 0f 0b e8 e3 72 71 ff 90 0f 0b e8 db 72 71 ff 90 <0f> 0b e8 d3 72 71 ff 90 0f 0b 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc9000253f618 EFLAGS: 00010293 RAX: ffffffff82237475 RBX: 0000000000000154 RCX: ffff888000800000 RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000 RBP: 0000000000000100 R08: ffffffff82237039 R09: 1ffff1100639095c R10: dffffc0000000000 R11: ffffed100639095d R12: 0000000000000000 R13: ffff888031c84ae0 R14: 0000000000000000 R15: 1ffff1100639095c FS: 0000555563876500(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fddb347fb98 CR3: 00000000566ca000 CR4: 0000000000352ef0 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_readdir+0x1b3/0x7d0 fs/nilfs2/dir.c:251 iterate_dir+0x571/0x800 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:407 [inline] __se_sys_getdents64+0x1d3/0x4a0 fs/readdir.c:392 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: 0033:0x7f5be9db0193 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 42 43 f8 ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 d8 RSP: 002b:00007ffe94f96358 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 0000555563899640 RCX: 00007f5be9db0193 RDX: 0000000000008000 RSI: 0000555563899640 RDI: 0000000000000006 RBP: 0000555563899614 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffa8 R13: 0000000000000016 R14: 0000555563899610 R15: 00007ffe94f996f0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:submit_bh_wbc+0x556/0x560 fs/buffer.c:2785 Code: 89 fa e8 1d d9 d1 02 e9 95 fe ff ff e8 f3 72 71 ff 90 0f 0b e8 eb 72 71 ff 90 0f 0b e8 e3 72 71 ff 90 0f 0b e8 db 72 71 ff 90 <0f> 0b e8 d3 72 71 ff 90 0f 0b 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc9000253f618 EFLAGS: 00010293 RAX: ffffffff82237475 RBX: 0000000000000154 RCX: ffff888000800000 RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000 RBP: 0000000000000100 R08: ffffffff82237039 R09: 1ffff1100639095c R10: dffffc0000000000 R11: ffffed100639095d R12: 0000000000000000 R13: ffff888031c84ae0 R14: 0000000000000000 R15: 1ffff1100639095c FS: 0000555563876500(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fddb347fb98 CR3: 00000000566ca000 CR4: 0000000000352ef0 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.
