[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 74.589993][ T6874] IPVS: ftp: loaded support on port[0] = 21 [ 74.635455][ T6874] general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN [ 74.647168][ T6874] KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f] [ 74.655555][ T6874] CPU: 0 PID: 6874 Comm: syz-executor749 Not tainted 5.9.0-rc6-next-20200924-syzkaller #0 [ 74.665423][ T6874] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.676330][ T6874] RIP: 0010:io_poll_double_wake+0x51/0x510 [ 74.682109][ T6874] Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 9e 03 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5d 08 48 8d 7b 48 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 06 0f 8e 63 03 00 00 0f b6 6b 48 bf 06 00 00 [ 74.701697][ T6874] RSP: 0018:ffffc90001c1fb70 EFLAGS: 00010006 [ 74.707738][ T6874] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000004 [ 74.715684][ T6874] RDX: 0000000000000009 RSI: ffffffff81d9b3ad RDI: 0000000000000048 [ 74.723628][ T6874] RBP: dffffc0000000000 R08: ffff8880a3cac798 R09: ffffc90001c1fc60 [ 74.731610][ T6874] R10: fffff52000383f73 R11: 0000000000000000 R12: 0000000000000004 [ 74.739929][ T6874] R13: ffff8880a3cac798 R14: ffff8880a3cac7a0 R15: 0000000000000004 [ 74.747890][ T6874] FS: 0000000001f98880(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 [ 74.756799][ T6874] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 74.763363][ T6874] CR2: 00007f18886916c0 CR3: 0000000094c5a000 CR4: 00000000001506f0 [ 74.771309][ T6874] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 74.779252][ T6874] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 74.787204][ T6874] Call Trace: [ 74.790488][ T6874] ? lock_is_held_type+0xbb/0xf0 [ 74.795396][ T6874] ? rwlock_bug.part.0+0x90/0x90 [ 74.800305][ T6874] __wake_up_common+0x147/0x650 [ 74.805128][ T6874] __wake_up_common_lock+0xd0/0x130 [ 74.810297][ T6874] ? __wake_up_common+0x650/0x650 [ 74.815291][ T6874] ? lock_downgrade+0x830/0x830 [ 74.820132][ T6874] tty_ldisc_hangup+0x1cf/0x680 [ 74.824955][ T6874] __tty_hangup.part.0+0x403/0x870 [ 74.830039][ T6874] tty_vhangup+0x1d/0x30 [ 74.834258][ T6874] pty_close+0x3f5/0x550 [ 74.838476][ T6874] ? ptmx_open+0x360/0x360 [ 74.842863][ T6874] tty_release+0x455/0xf60 [ 74.847267][ T6874] __fput+0x285/0x920 [ 74.851220][ T6874] ? tty_release_struct+0xe0/0xe0 [ 74.856214][ T6874] task_work_run+0xdd/0x190 [ 74.860827][ T6874] exit_to_user_mode_prepare+0x1e2/0x1f0 [ 74.866445][ T6874] syscall_exit_to_user_mode+0x7a/0x2c0 [ 74.871971][ T6874] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 74.877837][ T6874] RIP: 0033:0x401210 [ 74.881707][ T6874] Code: 01 f0 ff ff 0f 83 20 0c 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d dd 24 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 f4 0b 00 00 c3 48 83 ec 08 e8 5a 01 00 00 [ 74.901288][ T6874] RSP: 002b:00007ffcdc2c7408 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 74.909677][ T6874] RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000401210 [ 74.917626][ T6874] RDX: 0000000000000000 RSI: 000000000000450c RDI: 0000000000000003 [ 74.925573][ T6874] RBP: 00007ffcdc2c7410 R08: 0000000000000000 R09: 0000000000000000 [ 74.933519][ T6874] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402290 [ 74.941464][ T6874] R13: 0000000000402320 R14: 0000000000000000 R15: 0000000000000000 [ 74.949413][ T6874] Modules linked in: [ 74.953293][ T6874] ---[ end trace b71b955b40cc85b6 ]--- [ 74.958731][ T6874] RIP: 0010:io_poll_double_wake+0x51/0x510 [ 74.964510][ T6874] Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 9e 03 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5d 08 48 8d 7b 48 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 06 0f 8e 63 03 00 00 0f b6 6b 48 bf 06 00 00 [ 74.984179][ T6874] RSP: 0018:ffffc90001c1fb70 EFLAGS: 00010006 [ 74.990221][ T6874] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000004 [ 74.998166][ T6874] RDX: 0000000000000009 RSI: ffffffff81d9b3ad RDI: 0000000000000048 [ 75.006116][ T6874] RBP: dffffc0000000000 R08: ffff8880a3cac798 R09: ffffc90001c1fc60 [ 75.014103][ T6874] R10: fffff52000383f73 R11: 0000000000000000 R12: 0000000000000004 [ 75.022058][ T6874] R13: ffff8880a3cac798 R14: ffff8880a3cac7a0 R15: 0000000000000004 [ 75.030011][ T6874] FS: 0000000001f98880(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 [ 75.038913][ T6874] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 75.045469][ T6874] CR2: 00007f18886916c0 CR3: 0000000094c5a000 CR4: 00000000001506f0 [ 75.053434][ T6874] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 75.061386][ T6874] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 75.069331][ T6874] Kernel panic - not syncing: Fatal exception [ 75.076681][ T6874] Kernel Offset: disabled [ 75.081036][ T6874] Rebooting in 86400 seconds..