[ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ 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... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.198' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 72.408728][ T6532] general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN [ 72.420480][ T6532] KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] [ 72.428883][ T6532] CPU: 0 PID: 6532 Comm: syz-executor167 Not tainted 5.16.0-rc3-syzkaller #0 [ 72.437635][ T6532] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.447676][ T6532] RIP: 0010:__lock_acquire+0xd7d/0x54a0 [ 72.453233][ T6532] Code: 0f 0e 41 be 01 00 00 00 0f 86 c8 00 00 00 89 05 99 bc 0f 0e e9 bd 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 f3 2f 00 00 48 81 3b 20 65 17 8f 0f 84 52 f3 ff [ 72.472846][ T6532] RSP: 0018:ffffc90001a5f818 EFLAGS: 00010006 [ 72.478919][ T6532] RAX: dffffc0000000000 RBX: 0000000000000018 RCX: 0000000000000000 [ 72.486979][ T6532] RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000001 [ 72.494939][ T6532] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 [ 72.502902][ T6532] R10: 0000000000000000 R11: 000000000000000a R12: 0000000000000000 [ 72.510865][ T6532] R13: ffff88801c763a00 R14: 0000000000000000 R15: 0000000000000001 [ 72.518827][ T6532] FS: 00007f25ba4e9700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 [ 72.527748][ T6532] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 72.534327][ T6532] CR2: 00007f25ba4c7268 CR3: 00000000147a7000 CR4: 00000000003506f0 [ 72.542305][ T6532] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 72.550277][ T6532] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 72.558239][ T6532] Call Trace: [ 72.561507][ T6532] [ 72.564428][ T6532] ? __lock_acquire+0x162f/0x54a0 [ 72.569461][ T6532] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 72.575441][ T6532] ? mark_lock+0xef/0x17b0 [ 72.579854][ T6532] lock_acquire+0x1ab/0x510 [ 72.584351][ T6532] ? finish_wait+0xc0/0x270 [ 72.588846][ T6532] ? lock_release+0x720/0x720 [ 72.593517][ T6532] ? find_held_lock+0x2d/0x110 [ 72.598288][ T6532] ? inet_csk_accept+0x3e1/0x9d0 [ 72.603247][ T6532] ? _raw_spin_lock_irqsave+0x4e/0x50 [ 72.608622][ T6532] _raw_spin_lock_irqsave+0x39/0x50 [ 72.613825][ T6532] ? finish_wait+0xc0/0x270 [ 72.618330][ T6532] finish_wait+0xc0/0x270 [ 72.622657][ T6532] inet_csk_accept+0x7de/0x9d0 [ 72.627423][ T6532] ? reqsk_put+0x2f0/0x2f0 [ 72.631833][ T6532] ? release_sock+0x1b/0x1b0 [ 72.636422][ T6532] ? finish_wait+0x270/0x270 [ 72.641008][ T6532] mptcp_accept+0xe5/0x500 [ 72.645418][ T6532] inet_accept+0xe4/0x7b0 [ 72.649761][ T6532] ? rwlock_bug.part.0+0x90/0x90 [ 72.654696][ T6532] ? ipv4_mib_init_net+0x560/0x560 [ 72.659801][ T6532] ? __local_bh_enable_ip+0xa0/0x120 [ 72.665087][ T6532] mptcp_stream_accept+0x2e7/0x10e0 [ 72.670281][ T6532] ? do_raw_spin_unlock+0x171/0x230 [ 72.675473][ T6532] ? mptcp_subflow_delegate.constprop.0+0x440/0x440 [ 72.682054][ T6532] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 72.688295][ T6532] do_accept+0x382/0x510 [ 72.692535][ T6532] ? __ia32_sys_listen+0x70/0x70 [ 72.697466][ T6532] ? rwlock_bug.part.0+0x90/0x90 [ 72.702398][ T6532] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 72.708634][ T6532] ? _find_next_bit+0x1e3/0x260 [ 72.713479][ T6532] ? do_raw_spin_unlock+0x171/0x230 [ 72.718671][ T6532] ? _raw_spin_unlock+0x24/0x40 [ 72.723514][ T6532] ? alloc_fd+0x2f0/0x670 [ 72.727842][ T6532] __sys_accept4_file+0x7e/0xe0 [ 72.732694][ T6532] __sys_accept4+0xb0/0x100 [ 72.737193][ T6532] __x64_sys_accept+0x71/0xb0 [ 72.741878][ T6532] ? syscall_enter_from_user_mode+0x21/0x70 [ 72.747770][ T6532] do_syscall_64+0x35/0xb0 [ 72.752182][ T6532] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 72.758069][ T6532] RIP: 0033:0x7f25ba5378e9 [ 72.762476][ T6532] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 72.782074][ T6532] RSP: 002b:00007f25ba4e9308 EFLAGS: 00000246 ORIG_RAX: 000000000000002b [ 72.790480][ T6532] RAX: ffffffffffffffda RBX: 00007f25ba5bf408 RCX: 00007f25ba5378e9 [ 72.798440][ T6532] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 72.806398][ T6532] RBP: 00007f25ba5bf400 R08: 0000000000000000 R09: 0000000000000000 [ 72.814357][ T6532] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f25ba5bf40c [ 72.822317][ T6532] R13: 00007f25ba58d004 R14: 6d705f706374706d R15: 0000000000022000 [ 72.830285][ T6532] [ 72.833292][ T6532] Modules linked in: [ 72.837175][ T6532] ---[ end trace 43b516eabb408bcb ]--- [ 72.842614][ T6532] RIP: 0010:__lock_acquire+0xd7d/0x54a0 [ 72.848161][ T6532] Code: 0f 0e 41 be 01 00 00 00 0f 86 c8 00 00 00 89 05 99 bc 0f 0e e9 bd 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 f3 2f 00 00 48 81 3b 20 65 17 8f 0f 84 52 f3 ff [ 72.867773][ T6532] RSP: 0018:ffffc90001a5f818 EFLAGS: 00010006 [ 72.873850][ T6532] RAX: dffffc0000000000 RBX: 0000000000000018 RCX: 0000000000000000 [ 72.881813][ T6532] RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000001 [ 72.889773][ T6532] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 [ 72.897737][ T6532] R10: 0000000000000000 R11: 000000000000000a R12: 0000000000000000 [ 72.905697][ T6532] R13: ffff88801c763a00 R14: 0000000000000000 R15: 0000000000000001 [ 72.913659][ T6532] FS: 00007f25ba4e9700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 [ 72.922590][ T6532] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 72.929165][ T6532] CR2: 00007f25ba4c7268 CR3: 00000000147a7000 CR4: 00000000003506f0 [ 72.937128][ T6532] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 72.945085][ T6532] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 72.953046][ T6532] Kernel panic - not syncing: Fatal exception [ 72.959352][ T6532] Kernel Offset: disabled [ 72.963662][ T6532] Rebooting in 86400 seconds..