Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.8' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 57.629170][ T6853] ------------[ cut here ]------------ [ 57.634731][ T6853] Buffer overflow detected (80 < 137)! [ 57.641503][ T6853] WARNING: CPU: 0 PID: 6853 at include/linux/thread_info.h:134 compat_do_ebt_get_ctl+0x47e/0x500 [ 57.652321][ T6853] Kernel panic - not syncing: panic_on_warn set ... [ 57.658900][ T6853] CPU: 0 PID: 6853 Comm: syz-executor171 Not tainted 5.8.0-syzkaller #0 [ 57.667194][ T6853] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.677225][ T6853] Call Trace: [ 57.680492][ T6853] dump_stack+0x18f/0x20d [ 57.684796][ T6853] panic+0x2e3/0x75c [ 57.688667][ T6853] ? __warn_printk+0xf3/0xf3 [ 57.693232][ T6853] ? __warn.cold+0x5/0x45 [ 57.697531][ T6853] ? __warn+0xd6/0x1f2 [ 57.701574][ T6853] ? compat_do_ebt_get_ctl+0x47e/0x500 [ 57.707004][ T6853] __warn.cold+0x20/0x45 [ 57.711230][ T6853] ? wake_up_klogd.part.0+0x8c/0xc0 [ 57.716400][ T6853] ? compat_do_ebt_get_ctl+0x47e/0x500 [ 57.721831][ T6853] report_bug+0x1bd/0x210 [ 57.726135][ T6853] handle_bug+0x38/0x90 [ 57.730263][ T6853] exc_invalid_op+0x14/0x40 [ 57.734740][ T6853] asm_exc_invalid_op+0x12/0x20 [ 57.739563][ T6853] RIP: 0010:compat_do_ebt_get_ctl+0x47e/0x500 [ 57.745599][ T6853] Code: ba fd ff ff 4c 89 f7 e8 60 07 a2 fa e9 ad fd ff ff e8 36 18 62 fa 4c 89 e2 be 50 00 00 00 48 c7 c7 40 b9 0e 89 e8 94 1f 33 fa <0f> 0b e9 dc fd ff ff 41 bc f2 ff ff ff e9 4f fe ff ff e8 3b 07 a2 [ 57.765176][ T6853] RSP: 0018:ffffc90005667ae8 EFLAGS: 00010282 [ 57.771219][ T6853] RAX: 0000000000000000 RBX: 1ffff92000accf5e RCX: 0000000000000000 [ 57.779231][ T6853] RDX: ffff88809458a280 RSI: ffffffff815dbce7 RDI: fffff52000accf4f [ 57.787173][ T6853] RBP: ffffffff8a8faa60 R08: 0000000000000001 R09: ffff8880ae6318e7 [ 57.795119][ T6853] R10: 0000000000000000 R11: 0000000035383654 R12: 0000000000000089 [ 57.803061][ T6853] R13: 0000000020000000 R14: ffffc90005667d80 R15: ffffc90005667b20 [ 57.811015][ T6853] ? vprintk_func+0x97/0x1a6 [ 57.815580][ T6853] ? compat_do_ebt_get_ctl+0x47e/0x500 [ 57.821017][ T6853] ? compat_copy_everything_to_user+0xfa0/0xfa0 [ 57.827307][ T6853] ? bpf_lsm_capable+0x5/0x10 [ 57.831960][ T6853] ? security_capable+0x8f/0xc0 [ 57.836789][ T6853] do_ebt_get_ctl+0x2b4/0x790 [ 57.841484][ T6853] ? compat_do_ebt_get_ctl+0x500/0x500 [ 57.846917][ T6853] ? __mutex_unlock_slowpath+0xe2/0x610 [ 57.852437][ T6853] ? find_held_lock+0x2d/0x110 [ 57.857202][ T6853] ? wait_for_completion+0x260/0x260 [ 57.862515][ T6853] ? lock_downgrade+0x830/0x830 [ 57.867352][ T6853] ? do_huge_pmd_anonymous_page+0x1b94/0x2230 [ 57.873420][ T6853] ? nf_sockopt_find.constprop.0+0x22d/0x2a0 [ 57.879400][ T6853] nf_getsockopt+0x72/0xd0 [ 57.883822][ T6853] ip_getsockopt+0x164/0x1c0 [ 57.888414][ T6853] ? do_ip_getsockopt+0x18e0/0x18e0 [ 57.893612][ T6853] ? find_held_lock+0x2d/0x110 [ 57.898379][ T6853] tcp_getsockopt+0x86/0xd0 [ 57.902884][ T6853] ? sock_def_destruct+0x10/0x10 [ 57.907816][ T6853] __sys_getsockopt+0x219/0x4c0 [ 57.912674][ T6853] ? __ia32_sys_setsockopt+0x150/0x150 [ 57.918137][ T6853] ? syscall_enter_from_user_mode+0x20/0x290 [ 57.924118][ T6853] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 57.930099][ T6853] __ia32_sys_getsockopt+0xb9/0x150 [ 57.935294][ T6853] ? syscall_enter_from_user_mode+0x20/0x290 [ 57.941273][ T6853] __do_fast_syscall_32+0x57/0x80 [ 57.946297][ T6853] do_fast_syscall_32+0x2f/0x70 [ 57.951139][ T6853] entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 57.957439][ T6853] RIP: 0023:0xf7f91569 [ 57.961482][ T6853] Code: 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 57.981081][ T6853] RSP: 002b:00000000ffdae08c EFLAGS: 00000292 ORIG_RAX: 000000000000016d [ 57.989468][ T6853] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000000 [ 57.997454][ T6853] RDX: 0000000000000082 RSI: 0000000020000000 RDI: 0000000020000100 [ 58.005400][ T6853] RBP: 0000000000000012 R08: 0000000000000000 R09: 0000000000000000 [ 58.013345][ T6853] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 58.021296][ T6853] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 58.030466][ T6853] Kernel Offset: disabled [ 58.034831][ T6853] Rebooting in 86400 seconds..