------------[ cut here ]------------ Too BIG xdp->frame_sz = 131072 WARNING: CPU: 1 PID: 5943 at net/core/filter.c:4094 bpf_xdp_adjust_tail+0x228/0x230 net/core/filter.c:4076 Modules linked in: CPU: 1 PID: 5943 Comm: syz-executor125 Not tainted 6.3.0-rc1-syzkaller-gfe15c26ee26e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : bpf_xdp_adjust_tail+0x228/0x230 net/core/filter.c:4076 lr : ____bpf_xdp_adjust_tail net/core/filter.c:4094 [inline] lr : bpf_xdp_adjust_tail+0x224/0x230 net/core/filter.c:4076 sp : ffff80001e2374b0 x29: ffff80001e2374b0 x28: ffff0000d846feef x27: 1ffff00003c46ee1 x26: dfff800000000000 x25: ffff80001e237718 x24: 0000000000000000 x23: 0000000000020000 x22: ffff0000d846feef x21: ffff80001e237700 x20: ffff80001e237708 x19: ffff8000186ef000 x18: ffff80001e2369a0 x17: 0000000000000000 x16: ffff80001246250c x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000001 x11: ff808000081bd230 x10: 0000000000000000 x9 : 19870ee59af00c00 x8 : 19870ee59af00c00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001e236d98 x4 : ffff800015dc52c0 x3 : ffff80000859c514 x2 : 0000000000000001 x1 : 0000000100000200 x0 : ffffffffffffffea Call trace: bpf_xdp_adjust_tail+0x228/0x230 net/core/filter.c:4076 bpf_prog_4add87e5301a4105+0x50/0x80 bpf_dispatcher_xdp_func+0x30/0x44 net/core/filter.c:11412 __bpf_prog_run include/linux/filter.h:601 [inline] bpf_prog_run_xdp include/linux/filter.h:776 [inline] bpf_prog_run_generic_xdp+0x428/0xf44 net/core/dev.c:4749 netif_receive_generic_xdp net/core/dev.c:4835 [inline] do_xdp_generic+0x348/0x634 net/core/dev.c:4894 tun_get_user+0x1e44/0x3820 drivers/net/tun.c:1918 tun_chr_write_iter+0xfc/0x204 drivers/net/tun.c:2034 call_write_iter include/linux/fs.h:1851 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x610/0x914 fs/read_write.c:584 ksys_write+0x15c/0x26c fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 irq event stamp: 15225 hardirqs last enabled at (15224): [] __up_console_sem+0x60/0xb4 kernel/printk/printk.c:345 hardirqs last disabled at (15225): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (15050): [] spin_unlock_bh include/linux/spinlock.h:395 [inline] softirqs last enabled at (15050): [] bpf_link_settle+0x80/0x148 kernel/bpf/syscall.c:2892 softirqs last disabled at (15160): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- Illegal XDP return value 4294967274 on prog (id 1) dev syz_tun, expect packet loss!