[ OK ] Started Getty on tty1. [ OK ] Found device /dev/ttyS0. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.61' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 33.781742] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready [ 33.795542] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 33.817083] kasan: CONFIG_KASAN_INLINE enabled [ 33.821892] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 33.832630] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.838868] CPU: 1 PID: 8171 Comm: syz-executor737 Not tainted 4.19.155-syzkaller #0 [ 33.846739] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.856099] RIP: 0010:ieee80211_chanctx_num_assigned+0xb1/0x130 [ 33.862156] Code: 08 f8 ff ff 48 39 c5 74 3b 49 bd 00 00 00 00 00 fc ff df e8 d1 d4 9f f9 48 8d bb f8 07 00 00 41 83 c4 01 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 75 61 48 8b 83 f8 07 00 00 48 8d 98 08 f8 ff ff 48 [ 33.881053] RSP: 0018:ffff8880b2c173e8 EFLAGS: 00010a02 [ 33.886409] RAX: 1bd5a00000000020 RBX: deacfffffffff908 RCX: ffffffff87c4fa1b [ 33.893672] RDX: 0000000000000000 RSI: ffffffff87c4f9bf RDI: dead000000000100 [ 33.900942] RBP: ffff8880b4dabb20 R08: ffff8880ab871700 R09: 0000000000000000 [ 33.908208] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000002 [ 33.915473] R13: dffffc0000000000 R14: ffff8880b4dabb00 R15: 0000000000000000 [ 33.922913] FS: 0000000000845880(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 33.931117] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.936977] CR2: 00007f693e3d1520 CR3: 00000000a11b3000 CR4: 00000000001406e0 [ 33.944227] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.951480] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.958729] Call Trace: [ 33.961304] ieee80211_assign_vif_chanctx+0x73c/0x1590 [ 33.966605] __ieee80211_vif_release_channel+0x22f/0x420 [ 33.972035] ieee80211_vif_release_channel+0x10a/0x1e0 [ 33.977302] ieee80211_ibss_disconnect+0x5a0/0xe40 [ 33.982212] ieee80211_ibss_leave+0x12/0xd8 [ 33.986520] __cfg80211_leave_ibss+0x191/0x7c0 [ 33.991101] cfg80211_leave_ibss+0x54/0x70 [ 33.995323] cfg80211_change_iface+0x925/0x1530 [ 33.999971] nl80211_set_interface+0x661/0x830 [ 34.004549] ? nl80211_nan_del_func+0x8b0/0x8b0 [ 34.009196] ? nl80211_dump_interface+0x6e0/0x6e0 [ 34.014017] ? nl80211_pre_doit+0xa2/0x620 [ 34.018270] ? __cfg80211_rdev_from_attrs+0x700/0x700 [ 34.023441] genl_family_rcv_msg+0x642/0xc40 [ 34.027832] ? genl_rcv+0x40/0x40 [ 34.031265] ? genl_rcv_msg+0x12f/0x160 [ 34.035219] ? __mutex_add_waiter+0x160/0x160 [ 34.039705] ? __radix_tree_lookup+0x216/0x370 [ 34.044266] genl_rcv_msg+0xbf/0x160 [ 34.047955] netlink_rcv_skb+0x160/0x440 [ 34.051995] ? genl_family_rcv_msg+0xc40/0xc40 [ 34.056566] ? netlink_ack+0xae0/0xae0 [ 34.060437] ? genl_rcv+0x15/0x40 [ 34.063870] genl_rcv+0x24/0x40 [ 34.067131] netlink_unicast+0x4d5/0x690 [ 34.071196] ? netlink_sendskb+0x110/0x110 [ 34.075410] ? _copy_from_iter_full+0x229/0x7c0 [ 34.080057] ? __phys_addr_symbol+0x2c/0x70 [ 34.084362] ? __check_object_size+0x17b/0x3d1 [ 34.088940] netlink_sendmsg+0x6bb/0xc40 [ 34.092981] ? aa_af_perm+0x230/0x230 [ 34.096761] ? nlmsg_notify+0x1a0/0x1a0 [ 34.100715] ? kernel_recvmsg+0x220/0x220 [ 34.104844] ? nlmsg_notify+0x1a0/0x1a0 [ 34.108811] sock_sendmsg+0xc3/0x120 [ 34.112519] ___sys_sendmsg+0x7bb/0x8e0 [ 34.116474] ? copy_msghdr_from_user+0x440/0x440 [ 34.121212] ? sock_ioctl+0x30e/0x5d0 [ 34.124993] ? dlci_ioctl_set+0x30/0x30 [ 34.128947] ? lock_downgrade+0x720/0x720 [ 34.133071] ? lock_acquire+0x170/0x3c0 [ 34.137116] ? debug_object_active_state+0x104/0x330 [ 34.142201] ? mark_held_locks+0xf0/0xf0 [ 34.146240] ? dlci_ioctl_set+0x30/0x30 [ 34.150196] ? do_vfs_ioctl+0x110/0x12e0 [ 34.154239] ? ioctl_preallocate+0x200/0x200 [ 34.158626] ? __fdget+0x1a0/0x230 [ 34.162265] __x64_sys_sendmsg+0x132/0x220 [ 34.166506] ? __sys_sendmsg+0x1b0/0x1b0 [ 34.170549] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 34.175893] ? trace_hardirqs_off_caller+0x6e/0x210 [ 34.180898] ? do_syscall_64+0x21/0x620 [ 34.184850] do_syscall_64+0xf9/0x620 [ 34.188646] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.193812] RIP: 0033:0x4421a9 [ 34.196985] Code: e8 4c ff 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 34.215873] RSP: 002b:00007ffc27e991f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 34.223557] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004421a9 [ 34.230803] RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000003 [ 34.238050] RBP: 000000306e616c77 R08: 00000000004002e0 R09: 00000000004002e0 [ 34.245295] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402d10 [ 34.252556] R13: 0000000000402da0 R14: 0000000000000000 R15: 0000000000000000 [ 34.259805] Modules linked in: [ 34.264391] ---[ end trace a17ab972c16e5f19 ]--- [ 34.269162] RIP: 0010:ieee80211_chanctx_num_assigned+0xb1/0x130 [ 34.275252] Code: 08 f8 ff ff 48 39 c5 74 3b 49 bd 00 00 00 00 00 fc ff df e8 d1 d4 9f f9 48 8d bb f8 07 00 00 41 83 c4 01 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 75 61 48 8b 83 f8 07 00 00 48 8d 98 08 f8 ff ff 48 [ 34.294217] RSP: 0018:ffff8880b2c173e8 EFLAGS: 00010a02 [ 34.299560] RAX: 1bd5a00000000020 RBX: deacfffffffff908 RCX: ffffffff87c4fa1b [ 34.306933] RDX: 0000000000000000 RSI: ffffffff87c4f9bf RDI: dead000000000100 [ 34.314251] RBP: ffff8880b4dabb20 R08: ffff8880ab871700 R09: 0000000000000000 [ 34.321510] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000002 [ 34.328794] R13: dffffc0000000000 R14: ffff8880b4dabb00 R15: 0000000000000000 [ 34.336097] FS: 0000000000845880(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 34.344338] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.350214] CR2: 00007f693e3d1520 CR3: 00000000a11b3000 CR4: 00000000001406e0 [ 34.357499] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.364930] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.372202] Kernel panic - not syncing: Fatal exception [ 34.378215] Kernel Offset: disabled [ 34.381828] Rebooting in 86400 seconds..