------------[ cut here ]------------
WARNING: CPU: 0 PID: 6782 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: 6782 Comm: syz.3.21 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #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 : ffff80009ef77360
x29: ffff80009ef77520 x28: dfff800000000000 x27: ffff80009ef773e0
x26: 0000000000001000 x25: 1fffe0001f7c00d4 x24: 1fffe0001ed2f0fd
x23: ffff700013deee7c x22: 0000000000000000 x21: 8000000000007fff
x20: ffff0000f69787e8 x19: 000000000000c000 x18: 00000000ffffffff
x17: ffff800093507000 x16: ffff800080528a28 x15: 0000000000000001
x14: 1fffffbff86f50b0 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000080000 x10: 0000000000002271 x9 : ffff8000aa6d0000
x8 : 0000000000002272 x7 : ffff800080a29ac4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80009ef774d0
x2 : 0000000000001002 x1 : 8000000000007fff x0 : 000000000000c000
Call trace:
 __bch2_truncate_folio+0x15dc/0x1850 fs/bcachefs/fs-io.c:361 (P)
 bch2_truncate_folios fs/bcachefs/fs-io.c:405 [inline]
 bchfs_fpunch+0x150/0x404 fs/bcachefs/fs-io.c:564
 bch2_fallocate_dispatch+0x2d4/0x434 fs/bcachefs/fs-io.c:838
 vfs_fallocate+0x52c/0x668 fs/open.c:342
 ioctl_preallocate fs/ioctl.c:290 [inline]
 file_ioctl+0x584/0x75c fs/ioctl.c:-1
 do_vfs_ioctl+0xa10/0x1834 fs/ioctl.c:577
 __do_sys_ioctl fs/ioctl.c:596 [inline]
 __se_sys_ioctl fs/ioctl.c:584 [inline]
 __arm64_sys_ioctl+0xe4/0x1c4 fs/ioctl.c:584
 __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: 2418
hardirqs last  enabled at (2417): [<ffff800080c6f5fc>] kasan_quarantine_put+0x1a0/0x1c8 mm/kasan/quarantine.c:234
hardirqs last disabled at (2418): [<ffff80008b001bfc>] el1_brk64+0x1c/0x48 arch/arm64/kernel/entry-common.c:574
softirqs last  enabled at (2370): [<ffff800080201608>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (2368): [<ffff8000802015d4>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---