syzbot

map[ReproOpts:{
 "pkg/ipc/ipc.go": {
  "Sandbox": "none",
  "UseNamespaces": false,
  "Cgroups": false,
  "CloseFDs": false
 }
} ReproSyz:r0 = syz_mount_image$xfs(&(0x7f0000000100)='xfs\x00', &(0x7f0000000200)='./file0\x00', 0x0, 0x0, 0x1, 0x0, 0x0)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000300)='file1\x00', 0x42, 0x1ff)
fallocate(r1, 0x1, 0x0, 0x10000)
close(r1)
r2 = openat(0xffffffffffffff9c, &(0x7f0000000400)='file2\x00', 0x42, 0x1ff)
fallocate(r2, 0x20, 0x0, 0x1000)
 SyzkallerCommit:31e9c887f7dc24e04b3ca70d0d54fc34141844b0]

map[DescriptionFiles:[acpi_thermal_rel.txt aio.txt auto.txt binfmt.txt bpf.txt bpf_prog.txt bpf_trace.txt cgroup.txt damon.txt dev_ashmem.txt dev_bifrost.txt dev_binder.txt dev_binderfs.txt dev_block.txt dev_bsg.txt dev_bus_usb.txt dev_camx.txt dev_cdrom.txt dev_cec.txt dev_char_usb.txt dev_comedi.txt dev_dma_heap.txt dev_dri.txt dev_dsp.txt dev_dvb_demux.txt dev_dvb_dvr.txt dev_dvb_frontend.txt dev_fb.txt dev_floppy.txt dev_hidraw.txt dev_i2c.txt dev_i915.txt dev_img_rogue.txt dev_infiniband_rdma.txt dev_infiniband_rdma_cm.txt dev_input.txt dev_iommu.txt dev_kvm.txt dev_kvm_amd64.txt dev_kvm_arm64.txt dev_kvm_extra.txt dev_kvm_riscv64.txt dev_loop.txt dev_mali.txt dev_media.txt dev_msm.txt dev_msr.txt dev_nbd.txt dev_net_tun.txt dev_panthor.txt dev_ppp.txt dev_ptmx.txt dev_ptp.txt dev_qat_adf_ctl.txt dev_qrtr_tun.txt dev_random.txt dev_rfkill.txt dev_rtc.txt dev_sequencer.txt dev_sg.txt dev_snapshot.txt dev_snd_control.txt dev_snd_hw.txt dev_snd_midi.txt dev_snd_pcm.txt dev_snd_seq.txt dev_snd_timer.txt dev_sr.txt dev_sw_sync.txt dev_tlk_device.txt dev_trusty.txt dev_udmabuf.txt dev_uhid.txt dev_uinput.txt dev_usb_hiddev.txt dev_usbmon.txt dev_userio.txt dev_vfio.txt dev_vga_arbiter.txt dev_vhci.txt dev_video4linux.txt dev_video4linux_vim2m.txt dev_virtual_nci.txt dev_vtpm.txt fanotify.txt filesystem.txt fs_9p.txt fs_fuse.txt fs_incfs.txt fs_ioctl.txt fs_ioctl_autofs.txt fs_ioctl_btrfs.txt fs_ioctl_ext4.txt fs_ioctl_f2fs.txt fs_ioctl_fat.txt fs_ioctl_fscrypt.txt fs_ioctl_fsverity.txt fs_ioctl_xfs.txt futex.txt hafnium.txt inotify.txt io_uring.txt ipc.txt key.txt kfuzztest.txt l2cap.txt landlock.txt lsm.txt namespaces.txt net_80211.txt netfilter.txt netfilter_arp.txt netfilter_bridge.txt netfilter_ipv4.txt netfilter_ipv6.txt netfilter_ipvs.txt netfilter_targets.txt pagemap_ioctl.txt perf.txt prctl.txt quotactl.txt seccomp.txt security_apparmor.txt security_selinux.txt security_smack.txt socket.txt socket_alg.txt socket_ax25.txt socket_bluetooth.txt socket_caif.txt socket_can.txt socket_ieee802154.txt socket_inet.txt socket_inet6.txt socket_inet_dccp.txt socket_inet_icmp.txt socket_inet_igmp.txt socket_inet_l2tp.txt socket_inet_sctp.txt socket_inet_tcp.txt socket_inet_udp.txt socket_ip_tunnel.txt socket_isdn.txt socket_kcm.txt socket_key.txt socket_llc.txt socket_netlink.txt socket_netlink_audit.txt socket_netlink_crypto.txt socket_netlink_generic.txt socket_netlink_generic_80211.txt socket_netlink_generic_batadv.txt socket_netlink_generic_devlink.txt socket_netlink_generic_ethtool.txt socket_netlink_generic_fou.txt socket_netlink_generic_gtp.txt socket_netlink_generic_mptcp.txt socket_netlink_generic_net_dm.txt socket_netlink_generic_netlabel.txt socket_netlink_generic_nfc.txt socket_netlink_generic_seg6.txt socket_netlink_generic_smc.txt socket_netlink_generic_team.txt socket_netlink_generic_wireguard.txt socket_netlink_netfilter.txt socket_netlink_netfilter_acct.txt socket_netlink_netfilter_conntrack.txt socket_netlink_netfilter_conntrack_exp.txt socket_netlink_netfilter_conntrack_helper.txt socket_netlink_netfilter_ipset.txt socket_netlink_netfilter_log.txt socket_netlink_netfilter_nft_compat.txt socket_netlink_netfilter_nftables.txt socket_netlink_netfilter_osf.txt socket_netlink_netfilter_queue.txt socket_netlink_netfilter_timeout.txt socket_netlink_rdma.txt socket_netlink_route.txt socket_netlink_route_sched.txt socket_netlink_route_sched_retired.txt socket_netlink_sock_diag.txt socket_netlink_xfrm.txt socket_netrom.txt socket_nfc.txt socket_nvme_of_tcp.txt socket_packet.txt socket_phonet.txt socket_pppox.txt socket_qipcrtr.txt socket_rds.txt socket_rose.txt socket_rxrpc.txt socket_tipc.txt socket_tipc_netlink.txt socket_unix.txt socket_vnet.txt socket_x25.txt socket_xdp.txt sys.txt uffd.txt usbip.txt vmw_vmci.txt vnet.txt vnet_mptcp.txt vusb.txt watch_queue.txt xattr.txt] SyzkallerCommit:31e9c887f7dc24e04b3ca70d0d54fc34141844b0]

map[KernelSrc:/usr/local/google/home/dvyukov/syzkaller/agent/workdir/cache/src/52d5b556e0818c1fa1e9e0ef8e0fa1ffbbead1f7]

map[KernelObj:/usr/local/google/home/dvyukov/syzkaller/agent/workdir/cache/build/1a0b3a775360b9f55f5d25c45a36903139b94e6f]

gemini-3-pro-preview

map[ReproOpts:{
 "pkg/ipc/ipc.go": {
  "Sandbox": "none",
  "UseNamespaces": false,
  "Cgroups": false,
  "CloseFDs": false
 }
}]

You are an expert in linux kernel fuzzing. Your goal is to write a syzkaller program to trigger a specific bug.
Print only the syz program that could be executed directly, without backticks.




Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

Bug Title: possible deadlock in xfs_can_free_eofblocks

Original Crash Report:
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
kswapd0/73 is trying to acquire lock:
ffff888011d85f18 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_can_free_eofblocks+0x693/0x8e0 fs/xfs/xfs_bmap_util.c:562

but task is already holding lock:
ffffffff8e051900 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6975 [inline]
ffffffff8e051900 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0x92a/0x2820 mm/vmscan.c:7354

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (fs_reclaim){+.+.}-{0:0}:
       __fs_reclaim_acquire mm/page_alloc.c:4301 [inline]
       fs_reclaim_acquire+0x72/0x100 mm/page_alloc.c:4315
       might_alloc include/linux/sched/mm.h:317 [inline]
       slab_pre_alloc_hook mm/slub.c:4904 [inline]
       slab_alloc_node mm/slub.c:5239 [inline]
       __kmalloc_cache_noprof+0x40/0x700 mm/slub.c:5771
       kmalloc_noprof include/linux/slab.h:957 [inline]
       iomap_fill_dirty_folios+0xf4/0x260 fs/iomap/buffered-io.c:1557
       xfs_buffered_write_iomap_begin+0xa23/0x1a70 fs/xfs/xfs_iomap.c:1857
       iomap_iter+0x5ef/0xeb0 fs/iomap/iter.c:110
       iomap_zero_range+0x1cc/0xa30 fs/iomap/buffered-io.c:1590
       xfs_zero_range+0x9a/0x100 fs/xfs/xfs_iomap.c:2289
       xfs_setattr_size+0x48b/0xed0 fs/xfs/xfs_iops.c:993
       xfs_falloc_setsize fs/xfs/xfs_file.c:1175 [inline]
       xfs_falloc_insert_range fs/xfs/xfs_file.c:1230 [inline]
       __xfs_file_fallocate+0xdd9/0x15d0 fs/xfs/xfs_file.c:1418
       xfs_file_fallocate+0x26e/0x320 fs/xfs/xfs_file.c:1500
       vfs_fallocate+0x669/0x7e0 fs/open.c:339
       ksys_fallocate fs/open.c:363 [inline]
       __do_sys_fallocate fs/open.c:368 [inline]
       __se_sys_fallocate fs/open.c:366 [inline]
       __x64_sys_fallocate+0xc0/0x110 fs/open.c:366
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&xfs_nondir_ilock_class){++++}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x15a6/0x2cf0 kernel/locking/lockdep.c:5237
       lock_acquire+0x107/0x340 kernel/locking/lockdep.c:5868
       down_read_nested+0x49/0x2e0 kernel/locking/rwsem.c:1662
       xfs_can_free_eofblocks+0x693/0x8e0 fs/xfs/xfs_bmap_util.c:562
       xfs_inode_mark_reclaimable+0x21d/0x1030 fs/xfs/xfs_icache.c:2244
       destroy_inode fs/inode.c:396 [inline]
       evict+0x8aa/0xae0 fs/inode.c:861
       dispose_list fs/inode.c:879 [inline]
       prune_icache_sb+0x21b/0x2c0 fs/inode.c:1027
       super_cache_scan+0x39b/0x4b0 fs/super.c:224
       do_shrink_slab+0x6df/0x10d0 mm/shrinker.c:437
       shrink_slab_memcg mm/shrinker.c:550 [inline]
       shrink_slab+0x7ef/0x10d0 mm/shrinker.c:628
       shrink_one+0x2d9/0x720 mm/vmscan.c:4921
       shrink_many mm/vmscan.c:4982 [inline]
       lru_gen_shrink_node mm/vmscan.c:5060 [inline]
       shrink_node+0x2f7d/0x35b0 mm/vmscan.c:6047
       kswapd_shrink_node mm/vmscan.c:6901 [inline]
       balance_pgdat mm/vmscan.c:7084 [inline]
       kswapd+0x145a/0x2820 mm/vmscan.c:7354
       kthread+0x711/0x8a0 kernel/kthread.c:463
       ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(fs_reclaim);
                               lock(&xfs_nondir_ilock_class);
                               lock(fs_reclaim);
  rlock(&xfs_nondir_ilock_class);

 *** DEADLOCK ***

2 locks held by kswapd0/73:
 #0: ffffffff8e051900 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6975 [inline]
 #0: ffffffff8e051900 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0x92a/0x2820 mm/vmscan.c:7354
 #1: ffff8880330ce0e0 (&type->s_umount_key#51){.+.+}-{4:4}, at: super_trylock_shared fs/super.c:563 [inline]
 #1: ffff8880330ce0e0 (&type->s_umount_key#51){.+.+}-{4:4}, at: super_cache_scan+0x91/0x4b0 fs/super.c:197

stack backtrace:
CPU: 0 UID: 0 PID: 73 Comm: kswapd0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2043
 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x15a6/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0x107/0x340 kernel/locking/lockdep.c:5868
 down_read_nested+0x49/0x2e0 kernel/locking/rwsem.c:1662
 xfs_can_free_eofblocks+0x693/0x8e0 fs/xfs/xfs_bmap_util.c:562
 xfs_inode_mark_reclaimable+0x21d/0x1030 fs/xfs/xfs_icache.c:2244
 destroy_inode fs/inode.c:396 [inline]
 evict+0x8aa/0xae0 fs/inode.c:861
 dispose_list fs/inode.c:879 [inline]
 prune_icache_sb+0x21b/0x2c0 fs/inode.c:1027
 super_cache_scan+0x39b/0x4b0 fs/super.c:224
 do_shrink_slab+0x6df/0x10d0 mm/shrinker.c:437
 shrink_slab_memcg mm/shrinker.c:550 [inline]
 shrink_slab+0x7ef/0x10d0 mm/shrinker.c:628
 shrink_one+0x2d9/0x720 mm/vmscan.c:4921
 shrink_many mm/vmscan.c:4982 [inline]
 lru_gen_shrink_node mm/vmscan.c:5060 [inline]
 shrink_node+0x2f7d/0x35b0 mm/vmscan.c:6047
 kswapd_shrink_node mm/vmscan.c:6901 [inline]
 balance_pgdat mm/vmscan.c:7084 [inline]
 kswapd+0x145a/0x2820 mm/vmscan.c:7354
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>


The list of existing description files:
acpi_thermal_rel.txt
aio.txt
auto.txt
binfmt.txt
bpf.txt
bpf_prog.txt
bpf_trace.txt
cgroup.txt
damon.txt
dev_ashmem.txt
dev_bifrost.txt
dev_binder.txt
dev_binderfs.txt
dev_block.txt
dev_bsg.txt
dev_bus_usb.txt
dev_camx.txt
dev_cdrom.txt
dev_cec.txt
dev_char_usb.txt
dev_comedi.txt
dev_dma_heap.txt
dev_dri.txt
dev_dsp.txt
dev_dvb_demux.txt
dev_dvb_dvr.txt
dev_dvb_frontend.txt
dev_fb.txt
dev_floppy.txt
dev_hidraw.txt
dev_i2c.txt
dev_i915.txt
dev_img_rogue.txt
dev_infiniband_rdma.txt
dev_infiniband_rdma_cm.txt
dev_input.txt
dev_iommu.txt
dev_kvm.txt
dev_kvm_amd64.txt
dev_kvm_arm64.txt
dev_kvm_extra.txt
dev_kvm_riscv64.txt
dev_loop.txt
dev_mali.txt
dev_media.txt
dev_msm.txt
dev_msr.txt
dev_nbd.txt
dev_net_tun.txt
dev_panthor.txt
dev_ppp.txt
dev_ptmx.txt
dev_ptp.txt
dev_qat_adf_ctl.txt
dev_qrtr_tun.txt
dev_random.txt
dev_rfkill.txt
dev_rtc.txt
dev_sequencer.txt
dev_sg.txt
dev_snapshot.txt
dev_snd_control.txt
dev_snd_hw.txt
dev_snd_midi.txt
dev_snd_pcm.txt
dev_snd_seq.txt
dev_snd_timer.txt
dev_sr.txt
dev_sw_sync.txt
dev_tlk_device.txt
dev_trusty.txt
dev_udmabuf.txt
dev_uhid.txt
dev_uinput.txt
dev_usb_hiddev.txt
dev_usbmon.txt
dev_userio.txt
dev_vfio.txt
dev_vga_arbiter.txt
dev_vhci.txt
dev_video4linux.txt
dev_video4linux_vim2m.txt
dev_virtual_nci.txt
dev_vtpm.txt
fanotify.txt
filesystem.txt
fs_9p.txt
fs_fuse.txt
fs_incfs.txt
fs_ioctl.txt
fs_ioctl_autofs.txt
fs_ioctl_btrfs.txt
fs_ioctl_ext4.txt
fs_ioctl_f2fs.txt
fs_ioctl_fat.txt
fs_ioctl_fscrypt.txt
fs_ioctl_fsverity.txt
fs_ioctl_xfs.txt
futex.txt
hafnium.txt
inotify.txt
io_uring.txt
ipc.txt
key.txt
kfuzztest.txt
l2cap.txt
landlock.txt
lsm.txt
namespaces.txt
net_80211.txt
netfilter.txt
netfilter_arp.txt
netfilter_bridge.txt
netfilter_ipv4.txt
netfilter_ipv6.txt
netfilter_ipvs.txt
netfilter_targets.txt
pagemap_ioctl.txt
perf.txt
prctl.txt
quotactl.txt
seccomp.txt
security_apparmor.txt
security_selinux.txt
security_smack.txt
socket.txt
socket_alg.txt
socket_ax25.txt
socket_bluetooth.txt
socket_caif.txt
socket_can.txt
socket_ieee802154.txt
socket_inet.txt
socket_inet6.txt
socket_inet_dccp.txt
socket_inet_icmp.txt
socket_inet_igmp.txt
socket_inet_l2tp.txt
socket_inet_sctp.txt
socket_inet_tcp.txt
socket_inet_udp.txt
socket_ip_tunnel.txt
socket_isdn.txt
socket_kcm.txt
socket_key.txt
socket_llc.txt
socket_netlink.txt
socket_netlink_audit.txt
socket_netlink_crypto.txt
socket_netlink_generic.txt
socket_netlink_generic_80211.txt
socket_netlink_generic_batadv.txt
socket_netlink_generic_devlink.txt
socket_netlink_generic_ethtool.txt
socket_netlink_generic_fou.txt
socket_netlink_generic_gtp.txt
socket_netlink_generic_mptcp.txt
socket_netlink_generic_net_dm.txt
socket_netlink_generic_netlabel.txt
socket_netlink_generic_nfc.txt
socket_netlink_generic_seg6.txt
socket_netlink_generic_smc.txt
socket_netlink_generic_team.txt
socket_netlink_generic_wireguard.txt
socket_netlink_netfilter.txt
socket_netlink_netfilter_acct.txt
socket_netlink_netfilter_conntrack.txt
socket_netlink_netfilter_conntrack_exp.txt
socket_netlink_netfilter_conntrack_helper.txt
socket_netlink_netfilter_ipset.txt
socket_netlink_netfilter_log.txt
socket_netlink_netfilter_nft_compat.txt
socket_netlink_netfilter_nftables.txt
socket_netlink_netfilter_osf.txt
socket_netlink_netfilter_queue.txt
socket_netlink_netfilter_timeout.txt
socket_netlink_rdma.txt
socket_netlink_route.txt
socket_netlink_route_sched.txt
socket_netlink_route_sched_retired.txt
socket_netlink_sock_diag.txt
socket_netlink_xfrm.txt
socket_netrom.txt
socket_nfc.txt
socket_nvme_of_tcp.txt
socket_packet.txt
socket_phonet.txt
socket_pppox.txt
socket_qipcrtr.txt
socket_rds.txt
socket_rose.txt
socket_rxrpc.txt
socket_tipc.txt
socket_tipc_netlink.txt
socket_unix.txt
socket_vnet.txt
socket_x25.txt
socket_xdp.txt
sys.txt
uffd.txt
usbip.txt
vmw_vmci.txt
vnet.txt
vnet_mptcp.txt
vusb.txt
watch_queue.txt
xattr.txt

r0 = syz_mount_image$xfs(&(0x7f0000000100)='xfs\x00', &(0x7f0000000200)='./file0\x00', 0x0, 0x0, 0x1, 0x0, 0x0)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000300)='file1\x00', 0x42, 0x1ff)
fallocate(r1, 0x1, 0x0, 0x10000)
close(r1)
r2 = openat(0xffffffffffffff9c, &(0x7f0000000400)='file2\x00', 0x42, 0x1ff)
fallocate(r2, 0x20, 0x0, 0x1000)

gemini-3-pro-preview

							input: 4807
							output: 66
							thoughts: 13694
						

**Deadlock Reproduction for XFS EOF Blocks**

Okay, so I need to craft a Syzkaller program to trigger that "possible deadlock in xfs_can_free_eofblocks" bug. The crash report pinpoints a circular locking dependency: a swap between `fs_reclaim` and `xfs_nondir_ilock_class`. It looks like `kswapd` is involved, and it's all about memory allocation and XFS inode locks.

Here's the plan I've pieced together. First, I'll mount an XFS filesystem. Then, I'll set up a situation where I grab an inode lock (`xfs_nondir_ilock_class`) and allocate some memory, which *might* trigger `fs_reclaim`. The report explicitly mentions `fallocate`, which is key here.

Now, I've got to construct the right sequence to make the deadlock *possible* (as lockdep sees it), so I don't necessarily need concurrency to reproduce it. I can make `xfs_nondir_ilock_class` depend on `fs_reclaim` with `fallocate` and then trigger the opposite dependency with shrinker or direct reclaim. The report seems to say I'm already halfway there! The *existing* chain is `xfs_nondir_ilock_class` -> `fs_reclaim`. This comes from `fallocate`, which holds an inode lock and makes a memory allocation, which *might* trigger reclaim. The other chain will trigger in shrinker code.

I need to create a file and use `fallocate` with `FALLOC_FL_INSERT_RANGE` on it. I need to make sure I create a file, `file1`, with blocks *beyond* the file size so that when `xfs_can_free_eofblocks` is called, it sees this condition and attempts to take the XFS inode lock (xfs_ilock). This will trigger `xfs_ilock` -> `fs_reclaim`.

To that end, the plan is:
1.  Mount the XFS filesystem.
2.  Open a new file, `file1`.
3.  Use `fallocate` with `FALLOC_FL_KEEP_SIZE` to allocate space *beyond* the file size. This creates "EOF blocks."
4.  Close `file1`. This is critical: this inode is now uncached, and available to the shrinker!
5.  Open a second file, `file2`.
6.  Use `fallocate` on it with `FALLOC_FL_INSERT_RANGE`, and offset 0, and length 4096.

This makes the call chain:
`fallocate` -> `xfs_falloc_insert_range` -> `kmalloc(GFP_KERNEL)`.
This sets up `xfs_ilock` -> `fs_reclaim`. `kmalloc` is in a path with `xfs_ilock` and might trigger reclaim.

The magic is:
`FALLOC_FL_KEEP_SIZE` to allocate blocks beyond size. This allows `xfs_can_free_eofblocks` to work and the deadlock path to exist!

By opening and using `fallocate` with `KEEP_SIZE`, the first file, `file1`, is in the reclaim list. Then `file2` causes the `fallocate` function to allocate memory. That, in turn, can trigger the shrinker/reclaim. When reclaim hits `file1`, `xfs_can_free_eofblocks` will trigger and then grab the IOLOCK and then the deadlock will be triggered.

Here's the Syzkaller program. This program should trigger the warning, and I'm confident in it:
```
r0 = syz_mount_image$xfs(&(0x7f0000000100)='xfs\x00', &(0x7f0000000200)='./file0\x00', 0x0, 0x0, 0x1, 0x0, 0x0)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000300)='file1\x00', 0x42, 0x1ff)
fallocate(r1, 0x1, 0x0, 0x10000)
close(r1)
r2 = openat(0xffffffffffffff9c, &(0x7f0000000400)='file2\x0

map[ReproOpts:{
 "pkg/ipc/ipc.go": {
  "Sandbox": "none",
  "UseNamespaces": false,
  "Cgroups": false,
  "CloseFDs": false
 }
}]

map[ReproOpts:{
 "pkg/ipc/ipc.go": {
  "Sandbox": "none",
  "UseNamespaces": false,
  "Cgroups": false,
  "CloseFDs": false
 }
}]

gemini-3-pro-preview

							input: 19656
							output: 246
							thoughts: 0