Warning: Permanently added '10.128.0.126' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 42.994935][ T4219] ------------[ cut here ]------------ [ 42.996187][ T4219] Too BIG xdp->frame_sz = 131072 [ 42.997751][ T4219] WARNING: CPU: 1 PID: 4219 at net/core/filter.c:4069 bpf_xdp_adjust_tail+0x228/0x230 [ 42.999725][ T4219] Modules linked in: [ 43.000486][ T4219] CPU: 1 PID: 4219 Comm: syz-executor180 Not tainted 6.1.34-syzkaller #0 [ 43.002330][ T4219] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 [ 43.004452][ T4219] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 43.006166][ T4219] pc : bpf_xdp_adjust_tail+0x228/0x230 [ 43.007288][ T4219] lr : bpf_xdp_adjust_tail+0x224/0x230 [ 43.008432][ T4219] sp : ffff80001ddc74b0 [ 43.009355][ T4219] x29: ffff80001ddc74b0 x28: ffff0000d47efeef x27: 1ffff00003bb8ee1 [ 43.011238][ T4219] x26: dfff800000000000 x25: ffff80001ddc7718 x24: 0000000000000000 [ 43.013061][ T4219] x23: 0000000000020000 x22: ffff0000d47efeef x21: ffff80001ddc7700 [ 43.014793][ T4219] x20: ffff80001ddc7708 x19: ffff800017ed7000 x18: ffff80001ddc68a0 [ 43.016596][ T4219] x17: 0000000000000000 x16: ffff8000121062b4 x15: 0000000000000000 [ 43.018461][ T4219] x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000001 [ 43.020191][ T4219] x11: ff808000081af018 x10: 0000000000000000 x9 : a559dff0842f4100 [ 43.021786][ T4219] x8 : a559dff0842f4100 x7 : 0000000000000001 x6 : 0000000000000001 [ 43.023508][ T4219] x5 : ffff80001ddc6d98 x4 : ffff8000156a2a40 x3 : ffff8000085879f4 [ 43.025281][ T4219] x2 : 0000000000000001 x1 : 0000000100000200 x0 : ffffffffffffffea [ 43.027057][ T4219] Call trace: [ 43.027794][ T4219] bpf_xdp_adjust_tail+0x228/0x230 [ 43.028894][ T4219] bpf_prog_4add87e5301a4105+0x50/0x80 [ 43.030139][ T4219] bpf_dispatcher_xdp_func+0x30/0x44 [ 43.031314][ T4219] bpf_prog_run_generic_xdp+0x428/0xf44 [ 43.032388][ T4219] do_xdp_generic+0x348/0x634 [ 43.033327][ T4219] tun_get_user+0x1e40/0x386c [ 43.034318][ T4219] tun_chr_write_iter+0xfc/0x204 [ 43.035372][ T4219] vfs_write+0x610/0x914 [ 43.036399][ T4219] ksys_write+0x15c/0x26c [ 43.037341][ T4219] __arm64_sys_write+0x7c/0x90 [ 43.038293][ T4219] invoke_syscall+0x98/0x2c0 [ 43.039264][ T4219] el0_svc_common+0x138/0x258 [ 43.040242][ T4219] do_el0_svc+0x64/0x218 [ 43.041103][ T4219] el0_svc+0x58/0x168 [ 43.041938][ T4219] el0t_64_sync_handler+0x84/0xf0 [ 43.043113][ T4219] el0t_64_sync+0x18c/0x190 [ 43.044064][ T4219] irq event stamp: 15055 [ 43.044949][ T4219] hardirqs last enabled at (15054): [] __up_console_sem+0xb4/0x100 [ 43.046941][ T4219] hardirqs last disabled at (15055): [] el1_dbg+0x24/0x80 [ 43.048704][ T4219] softirqs last enabled at (14876): [] bpf_link_settle+0x80/0x148 [ 43.050629][ T4219] softirqs last disabled at (14992): [] local_bh_disable+0x10/0x34 [ 43.052600][ T4219] ---[ end trace 0000000000000000 ]--- [ 43.053961][ T4219] Illegal XDP return value 4294967274 on prog (id 1) dev syz_tun, expect packet loss!