Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 56.986941][ T7047] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN [ 56.998678][ T7047] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 57.007330][ T7047] CPU: 0 PID: 7047 Comm: syz-executor840 Not tainted 5.7.0-rc6-syzkaller #0 [ 57.015978][ T7047] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.026242][ T7047] RIP: 0010:fq_codel_enqueue+0xa75/0x11b0 [ 57.031936][ T7047] Code: 27 fb 44 3b 64 24 70 0f 83 dd 00 00 00 e8 b3 6b 27 fb 48 8b 44 24 40 80 38 00 0f 85 5a 05 00 00 49 8b 06 48 89 c2 48 c1 ea 03 <42> 80 3c 2a 00 0f 85 52 05 00 00 48 8b 10 49 89 16 48 89 c2 48 c1 [ 57.051637][ T7047] RSP: 0018:ffffc900017e7690 EFLAGS: 00010246 [ 57.057781][ T7047] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc900017e7870 [ 57.067044][ T7047] RDX: 0000000000000000 RSI: ffffffff864bc96d RDI: 0000000000000000 [ 57.075003][ T7047] RBP: ffffc900017e77a0 R08: ffff8880a8c1c480 R09: fffffbfff185dd44 [ 57.083052][ T7047] R10: ffffffff8c2eea1f R11: fffffbfff185dd43 R12: 0000000000000400 [ 57.091098][ T7047] R13: dffffc0000000000 R14: ffff888089a60000 R15: ffffc900017e7870 [ 57.099244][ T7047] FS: 0000000000000000(0000) GS:ffff8880ae600000(0063) knlGS:00000000091ec840 [ 57.109367][ T7047] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 57.115937][ T7047] CR2: 0000000020000100 CR3: 00000000a7e9a000 CR4: 00000000001406f0 [ 57.123885][ T7047] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 57.132086][ T7047] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 57.140122][ T7047] Call Trace: [ 57.143405][ T7047] ? drop_func+0x60/0x60 [ 57.147645][ T7047] ? rwlock_bug.part.0+0x90/0x90 [ 57.152574][ T7047] ? rcu_read_lock_bh_held+0x5a/0xb0 [ 57.157836][ T7047] ? rcu_read_lock_sched_held+0xd0/0xd0 [ 57.163360][ T7047] __dev_queue_xmit+0x154a/0x30a0 [ 57.168373][ T7047] ? netdev_core_pick_tx+0x2e0/0x2e0 [ 57.173639][ T7047] ? _copy_from_iter+0x307/0xb60 [ 57.178916][ T7047] ? __check_object_size+0x171/0x437 [ 57.184354][ T7047] ? packet_parse_headers.isra.0+0x11c/0x470 [ 57.190482][ T7047] ? packet_seq_start+0x150/0x150 [ 57.195511][ T7047] ? packet_sendmsg+0x24fd/0x5e90 [ 57.200539][ T7047] packet_sendmsg+0x24fd/0x5e90 [ 57.205378][ T7047] ? aa_label_sk_perm+0x89/0xe0 [ 57.210309][ T7047] ? aa_sk_perm+0x319/0xab0 [ 57.214800][ T7047] ? packet_notifier+0x860/0x860 [ 57.220190][ T7047] ? aa_af_perm+0x260/0x260 [ 57.225033][ T7047] ? lock_downgrade+0x840/0x840 [ 57.229957][ T7047] ? packet_notifier+0x860/0x860 [ 57.234869][ T7047] sock_sendmsg+0xcf/0x120 [ 57.239295][ T7047] sock_write_iter+0x289/0x3c0 [ 57.244046][ T7047] ? sock_sendmsg+0x120/0x120 [ 57.248711][ T7047] ? packet_do_bind+0x452/0xc00 [ 57.254081][ T7047] new_sync_write+0x4a2/0x700 [ 57.258780][ T7047] ? new_sync_read+0x7a0/0x7a0 [ 57.264840][ T7047] ? apparmor_path_rmdir+0x30/0x30 [ 57.269956][ T7047] ? security_file_permission+0x8c/0x470 [ 57.275568][ T7047] __vfs_write+0xc9/0x100 [ 57.279877][ T7047] vfs_write+0x268/0x5d0 [ 57.284105][ T7047] ksys_write+0x1ee/0x250 [ 57.288410][ T7047] ? __ia32_sys_read+0xb0/0xb0 [ 57.294285][ T7047] ? trace_hardirqs_off_caller+0x55/0x230 [ 57.300076][ T7047] do_fast_syscall_32+0x270/0xe90 [ 57.305180][ T7047] entry_SYSENTER_compat+0x70/0x7f [ 57.310285][ T7047] Modules linked in: [ 57.314415][ T7047] ---[ end trace b26c8d33cfea1fd2 ]--- [ 57.319909][ T7047] RIP: 0010:fq_codel_enqueue+0xa75/0x11b0 [ 57.325715][ T7047] Code: 27 fb 44 3b 64 24 70 0f 83 dd 00 00 00 e8 b3 6b 27 fb 48 8b 44 24 40 80 38 00 0f 85 5a 05 00 00 49 8b 06 48 89 c2 48 c1 ea 03 <42> 80 3c 2a 00 0f 85 52 05 00 00 48 8b 10 49 89 16 48 89 c2 48 c1 [ 57.345669][ T7047] RSP: 0018:ffffc900017e7690 EFLAGS: 00010246 [ 57.351872][ T7047] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc900017e7870 [ 57.360218][ T7047] RDX: 0000000000000000 RSI: ffffffff864bc96d RDI: 0000000000000000 [ 57.368674][ T7047] RBP: ffffc900017e77a0 R08: ffff8880a8c1c480 R09: fffffbfff185dd44 [ 57.376792][ T7047] R10: ffffffff8c2eea1f R11: fffffbfff185dd43 R12: 0000000000000400 [ 57.385125][ T7047] R13: dffffc0000000000 R14: ffff888089a60000 R15: ffffc900017e7870 [ 57.395984][ T7047] FS: 0000000000000000(0000) GS:ffff8880ae600000(0063) knlGS:00000000091ec840 [ 57.405077][ T7047] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 57.411762][ T7047] CR2: 0000000020000100 CR3: 00000000a7e9a000 CR4: 00000000001406f0 [ 57.419884][ T7047] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 57.428118][ T7047] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 57.436271][ T7047] Kernel panic - not syncing: Fatal exception in interrupt [ 57.449048][ T7047] Kernel Offset: disabled [ 57.455569][ T7047] Rebooting in 86400 seconds..