------------[ cut here ]------------
WARNING: CPU: 0 PID: 7528 at fs/bcachefs/fs-io.c:361 __bch2_truncate_folio+0x15dc/0x1850 fs/bcachefs/fs-io.c:361
Modules linked in:
CPU: 0 UID: 0 PID: 7528 Comm: syz.0.123 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : __bch2_truncate_folio+0x15dc/0x1850 fs/bcachefs/fs-io.c:361
lr : __bch2_truncate_folio+0x15dc/0x1850 fs/bcachefs/fs-io.c:361
sp : ffff8000a50b7820
x29: ffff8000a50b79e0 x28: dfff800000000000 x27: ffff8000a50b78a0
x26: 0000000000019481 x25: 1fffe000208d00d4 x24: 1fffe0001efe9988
x23: ffff700014a16f14 x22: 0000000000000006 x21: 0000000000000000
x20: ffff0000f7f4cc40 x19: 0000000000000000 x18: 1fffe00033797688
x17: ffff80010c595000 x16: ffff800080529624 x15: 0000000000000001
x14: 1fffffbff8818978 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000080000 x10: 0000000000004cff x9 : ffff8000a57fa000
x8 : 0000000000004d00 x7 : ffff8000802314dc x6 : ffff8000802316d8
x5 : ffff0000f847acb0 x4 : 0000000000000001 x3 : ffff8000a50b7990
x2 : 0000000000001006 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 __bch2_truncate_folio+0x15dc/0x1850 fs/bcachefs/fs-io.c:361 (P)
 bch2_truncate_folios fs/bcachefs/fs-io.c:400 [inline]
 bchfs_fallocate+0x1c4/0x538 fs/bcachefs/fs-io.c:777
 bch2_fallocate_dispatch+0x2a0/0x434 fs/bcachefs/fs-io.c:836
 vfs_fallocate+0x52c/0x668 fs/open.c:342
 ksys_fallocate fs/open.c:366 [inline]
 __do_sys_fallocate fs/open.c:371 [inline]
 __se_sys_fallocate fs/open.c:369 [inline]
 __arm64_sys_fallocate+0xbc/0x10c fs/open.c:369
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
irq event stamp: 125296
hardirqs last  enabled at (125295): [<ffff8000805b8f6c>] __call_rcu_common kernel/rcu/tree.c:3148 [inline]
hardirqs last  enabled at (125295): [<ffff8000805b8f6c>] call_rcu+0x65c/0x978 kernel/rcu/tree.c:3243
hardirqs last disabled at (125296): [<ffff80008b00ebb4>] el1_brk64+0x1c/0x48 arch/arm64/kernel/entry-common.c:574
softirqs last  enabled at (125182): [<ffff800080201608>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (125180): [<ffff8000802015d4>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---