NILFS (loop2): nilfs_get_block (ino=18): a race condition while inserting a data block at offset=0
------------[ cut here ]------------
kernel BUG at fs/buffer.c:2768!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 PID: 5465 Comm: syz-executor.2 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:submit_bh_wbc+0x543/0x560 fs/buffer.c:2768
Code: 07 7d ff be 00 10 00 00 48 c7 c7 80 f8 26 8e 4c 89 fa e8 f0 cd be 02 e9 98 fe ff ff e8 86 07 7d ff 90 0f 0b e8 7e 07 7d ff 90 <0f> 0b e8 76 07 7d ff 90 0f 0b e8 6e 07 7d ff 90 0f 0b e8 66 07 7d
RSP: 0018:ffffc9000d377838 EFLAGS: 00010283
RAX: ffffffff8217ecd2 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc9000c04b000 RSI: 000000000000725a RDI: 000000000000725b
RBP: 0000000000000000 R08: ffffffff8217e833 R09: 1ffff11002275d22
R10: dffffc0000000000 R11: ffffed1002275d23 R12: 0000000000000000
R13: ffff8880113ae910 R14: 0000000000000000 R15: 1ffff11002275d22
FS:  00007f3f6a3de6c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560fdf2fc600 CR3: 000000002c466000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 submit_bh fs/buffer.c:2809 [inline]
 __bh_read fs/buffer.c:3074 [inline]
 bh_read_nowait include/linux/buffer_head.h:417 [inline]
 __block_write_begin_int+0x12d0/0x1a70 fs/buffer.c:2134
 __block_write_begin fs/buffer.c:2154 [inline]
 block_write_begin+0x9b/0x1e0 fs/buffer.c:2213
 nilfs_write_begin+0xa0/0x110 fs/nilfs2/inode.c:262
 generic_perform_write+0x322/0x640 mm/filemap.c:3930
 __generic_file_write_iter+0x1b8/0x230 mm/filemap.c:4022
 generic_file_write_iter+0xaf/0x310 mm/filemap.c:4051
 call_write_iter include/linux/fs.h:2108 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa84/0xcb0 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f3f6967dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3f6a3de0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3f697ac120 RCX: 00007f3f6967dda9
RDX: 0000000000000007 RSI: 0000000020000080 RDI: 0000000000000004
RBP: 00007f3f696ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f3f697ac120 R15: 00007ffdab2fe968
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:submit_bh_wbc+0x543/0x560 fs/buffer.c:2768
Code: 07 7d ff be 00 10 00 00 48 c7 c7 80 f8 26 8e 4c 89 fa e8 f0 cd be 02 e9 98 fe ff ff e8 86 07 7d ff 90 0f 0b e8 7e 07 7d ff 90 <0f> 0b e8 76 07 7d ff 90 0f 0b e8 6e 07 7d ff 90 0f 0b e8 66 07 7d
RSP: 0018:ffffc9000d377838 EFLAGS: 00010283
RAX: ffffffff8217ecd2 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc9000c04b000 RSI: 000000000000725a RDI: 000000000000725b
RBP: 0000000000000000 R08: ffffffff8217e833 R09: 1ffff11002275d22
R10: dffffc0000000000 R11: ffffed1002275d23 R12: 0000000000000000
R13: ffff8880113ae910 R14: 0000000000000000 R15: 1ffff11002275d22
FS:  00007f3f6a3de6c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdbb4b0020 CR3: 000000002c466000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400