syzbot

bcachefs (loop0): going read-write
bcachefs (loop0): insufficient writeable journal devices available: have 0, need 1
rw journal devs:
bcachefs (loop0): done starting filesystem
------------[ cut here ]------------
WARNING: CPU: 1 PID: 6031 at fs/bcachefs/fs-io.c:361 __bch2_truncate_folio+0x17a2/0x1a40 fs/bcachefs/fs-io.c:361
Modules linked in:
CPU: 1 UID: 0 PID: 6031 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__bch2_truncate_folio+0x17a2/0x1a40 fs/bcachefs/fs-io.c:361
Code: 5f 5d c3 cc cc cc cc cc e8 9b ae 88 fd 48 c7 c7 80 70 0b 8d e8 7f 5f e9 ff 89 05 b9 ad eb 14 e9 43 ea ff ff e8 7f ae 88 fd 90 <0f> 0b 90 e9 23 f9 ff ff e8 d1 a2 c0 06 e8 6c ae 88 fd be 00 10 00
RSP: 0018:ffffc90003ee7580 EFLAGS: 00010293
RAX: ffffffff8435add1 RBX: 0000000000000000 RCX: ffff888026d48000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003ee7750 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff94000118f49 R12: 1ffff11008f3c112
R13: dffffc0000000000 R14: ffff8880479e0890 R15: 0000000000000000
FS:  000055556c56e500(0000) GS:ffff8881269c2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30d63fff CR3: 000000003194a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 bch2_truncate_folios fs/bcachefs/fs-io.c:400 [inline]
 bchfs_fpunch+0x10f/0x520 fs/bcachefs/fs-io.c:564
 bch2_fallocate_dispatch+0x2bf/0x410 fs/bcachefs/fs-io.c:838
 vfs_fallocate+0x672/0x7f0 fs/open.c:342
 ioctl_preallocate fs/ioctl.c:290 [inline]
 file_ioctl+0x61d/0x780 fs/ioctl.c:-1
 do_vfs_ioctl+0xb36/0x1440 fs/ioctl.c:577
 __do_sys_ioctl fs/ioctl.c:596 [inline]
 __se_sys_ioctl+0x82/0x170 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb41783ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe05c8bc18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb417a65fa0 RCX: 00007fb41783ebe9
RDX: 00002000000004c0 RSI: 0000000040305829 RDI: 0000000000000004
RBP: 00007fb4178c1e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb417a65fa0 R14: 00007fb417a65fa0 R15: 0000000000000003
 </TASK>