[ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.224' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 70.941195][ T28] audit: type=1400 audit(1597517759.920:8): avc: denied { execmem } for pid=6845 comm="syz-executor619" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 70.965802][ T6845] general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN [ 70.977547][ T6845] KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047] [ 70.985964][ T6845] CPU: 0 PID: 6845 Comm: syz-executor619 Not tainted 5.8.0-syzkaller #0 [ 70.994283][ T6845] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.004353][ T6845] RIP: 0010:io_poll_double_wake+0x7a/0x3f0 [ 71.010164][ T6845] Code: 48 c1 ea 03 80 3c 02 00 0f 85 c7 02 00 00 48 8b ab b8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7d 40 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 97 02 00 00 31 ff 44 89 e6 48 8b 6d 40 e8 8e 39 [ 71.029772][ T6845] RSP: 0018:ffffc90000f57830 EFLAGS: 00010002 [ 71.035839][ T6845] RAX: dffffc0000000000 RBX: ffff88809f70fcc0 RCX: 0000000000000000 [ 71.043813][ T6845] RDX: 0000000000000008 RSI: ffffffff81d71089 RDI: 0000000000000040 [ 71.051764][ T6845] RBP: 0000000000000000 R08: ffff8880a6bf0a98 R09: ffffc90000f57910 [ 71.059754][ T6845] R10: fffff520001eaf09 R11: 0000000000000000 R12: 0000000000000000 [ 71.067752][ T6845] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 71.075717][ T6845] FS: 0000000000832880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 71.084628][ T6845] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 71.091189][ T6845] CR2: 0000000020000484 CR3: 00000000a8894000 CR4: 00000000001506f0 [ 71.099143][ T6845] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 71.107089][ T6845] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 71.115480][ T6845] Call Trace: [ 71.118751][ T6845] ? lock_is_held_type+0xbb/0xf0 [ 71.123688][ T6845] ? rwlock_bug.part.0+0x90/0x90 [ 71.128643][ T6845] __wake_up_common+0x147/0x650 [ 71.133475][ T6845] __wake_up_common_lock+0xd0/0x130 [ 71.138649][ T6845] ? __wake_up_common+0x650/0x650 [ 71.143648][ T6845] ? lock_is_held_type+0xbb/0xf0 [ 71.148615][ T6845] ? ldsem_down_read_trylock+0x11b/0x180 [ 71.154221][ T6845] ? ldsem_down_read_trylock+0x121/0x180 [ 71.159872][ T6845] ? __init_ldsem+0x170/0x170 [ 71.164572][ T6845] n_tty_set_termios+0x73d/0x1010 [ 71.169569][ T6845] ? n_tty_receive_buf+0x40/0x40 [ 71.174483][ T6845] tty_set_termios+0x5eb/0x840 [ 71.179226][ T6845] ? tty_wait_until_sent+0x530/0x530 [ 71.184486][ T6845] ? lock_downgrade+0x830/0x830 [ 71.189321][ T6845] ? up_write+0x191/0x560 [ 71.193633][ T6845] ? zero_buffer.isra.0+0x60/0x60 [ 71.198632][ T6845] set_termios.part.0+0x2be/0x4d0 [ 71.203631][ T6845] ? set_termiox+0x2f0/0x2f0 [ 71.208196][ T6845] ? trace_hardirqs_on+0x5f/0x220 [ 71.213195][ T6845] ? __tty_check_change.part.0+0x2c9/0x3f0 [ 71.218974][ T6845] tty_mode_ioctl+0x899/0xb60 [ 71.223623][ T6845] ? get_termio+0x2d0/0x2d0 [ 71.228098][ T6845] ? __ldsem_down_read_nested+0xd2/0x880 [ 71.233716][ T6845] ? __ldsem_down_read_nested+0xe3/0x880 [ 71.239325][ T6845] ? trace_hardirqs_on+0x5f/0x220 [ 71.244323][ T6845] ? lockdep_hardirqs_on+0x76/0xf0 [ 71.249409][ T6845] ? __ldsem_wake_readers+0x3c0/0x3c0 [ 71.254755][ T6845] ? tomoyo_path_number_perm+0x244/0x4d0 [ 71.260363][ T6845] n_tty_ioctl_helper+0x55/0x3a0 [ 71.265275][ T6845] n_tty_ioctl+0x56/0x370 [ 71.269578][ T6845] tty_ioctl+0x10c5/0x15f0 [ 71.273996][ T6845] ? commit_echoes+0x210/0x210 [ 71.278732][ T6845] ? tty_fasync+0x390/0x390 [ 71.283210][ T6845] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 71.289076][ T6845] ? do_vfs_ioctl+0x27d/0x1090 [ 71.293811][ T6845] ? generic_block_fiemap+0x60/0x60 [ 71.298984][ T6845] ? selinux_inode_getsecctx+0x90/0x90 [ 71.304417][ T6845] ? io_submit_sqes+0x2380/0x2380 [ 71.309434][ T6845] ? bpf_lsm_file_ioctl+0x5/0x10 [ 71.314346][ T6845] ? tty_fasync+0x390/0x390 [ 71.318845][ T6845] __x64_sys_ioctl+0x193/0x200 [ 71.323606][ T6845] do_syscall_64+0x2d/0x70 [ 71.328066][ T6845] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 71.333942][ T6845] RIP: 0033:0x4405d9 [ 71.337820][ T6845] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 71.357401][ T6845] RSP: 002b:00007ffd1801f5f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 71.365861][ T6845] RAX: ffffffffffffffda RBX: 0000000000401ed0 RCX: 00000000004405d9 [ 71.373809][ T6845] RDX: 0000000020000080 RSI: 0000000000005404 RDI: 0000000000000004 [ 71.381755][ T6845] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 71.389704][ T6845] R10: 0000000000003e69 R11: 0000000000000246 R12: 0000000000401e40 [ 71.397657][ T6845] R13: 0000000000401ed0 R14: 0000000000000000 R15: 0000000000000000 [ 71.405606][ T6845] Modules linked in: [ 71.409485][ T6845] ---[ end trace 349b24b3ebe4c661 ]--- [ 71.414920][ T6845] RIP: 0010:io_poll_double_wake+0x7a/0x3f0 [ 71.420705][ T6845] Code: 48 c1 ea 03 80 3c 02 00 0f 85 c7 02 00 00 48 8b ab b8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7d 40 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 97 02 00 00 31 ff 44 89 e6 48 8b 6d 40 e8 8e 39 [ 71.440292][ T6845] RSP: 0018:ffffc90000f57830 EFLAGS: 00010002 [ 71.446389][ T6845] RAX: dffffc0000000000 RBX: ffff88809f70fcc0 RCX: 0000000000000000 [ 71.454336][ T6845] RDX: 0000000000000008 RSI: ffffffff81d71089 RDI: 0000000000000040 [ 71.462282][ T6845] RBP: 0000000000000000 R08: ffff8880a6bf0a98 R09: ffffc90000f57910 [ 71.470229][ T6845] R10: fffff520001eaf09 R11: 0000000000000000 R12: 0000000000000000 [ 71.478174][ T6845] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 71.486124][ T6845] FS: 0000000000832880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 71.495024][ T6845] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 71.501580][ T6845] CR2: 0000000020000484 CR3: 00000000a8894000 CR4: 00000000001506f0 [ 71.509526][ T6845] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 71.517471][ T6845] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 71.525415][ T6845] Kernel panic - not syncing: Fatal exception [ 71.532155][ T6845] Kernel Offset: disabled [ 71.536491][ T6845] Rebooting in 86400 seconds..