[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.11' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 68.754352][ T8477] FAULT_INJECTION: forcing a failure. [ 68.754352][ T8477] name failslab, interval 1, probability 0, space 0, times 1 [ 68.767581][ T8477] CPU: 1 PID: 8477 Comm: syz-executor414 Not tainted 5.11.0-rc2-syzkaller #0 [ 68.776356][ T8477] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.787269][ T8477] Call Trace: [ 68.790538][ T8477] dump_stack+0x107/0x163 [ 68.794875][ T8477] should_fail.cold+0x5/0xa [ 68.799361][ T8477] ? alloc_fixed_file_ref_node+0x41/0x230 [ 68.805065][ T8477] ? alloc_fixed_file_ref_node+0x41/0x230 [ 68.810775][ T8477] should_failslab+0x5/0x10 [ 68.815263][ T8477] kmem_cache_alloc_trace+0x55/0x360 [ 68.820536][ T8477] alloc_fixed_file_ref_node+0x41/0x230 [ 68.826065][ T8477] io_sqe_files_unregister+0x5a/0x770 [ 68.831437][ T8477] ? lock_downgrade+0x6d0/0x6d0 [ 68.836306][ T8477] __do_sys_io_uring_register+0x1185/0x4080 [ 68.842198][ T8477] ? ksys_write+0x12d/0x250 [ 68.846694][ T8477] ? lock_downgrade+0x6d0/0x6d0 [ 68.851534][ T8477] ? proc_fail_nth_write+0x95/0x220 [ 68.856717][ T8477] ? proc_task_getattr+0x1e0/0x1e0 [ 68.861820][ T8477] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 68.868048][ T8477] ? vfs_write+0x18e/0xa30 [ 68.872487][ T8477] ? io_file_get+0x8d0/0x8d0 [ 68.877067][ T8477] ? syscall_enter_from_user_mode+0x1d/0x50 [ 68.882963][ T8477] do_syscall_64+0x2d/0x70 [ 68.887362][ T8477] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 68.893238][ T8477] RIP: 0033:0x440649 [ 68.897115][ T8477] 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 [ 68.916702][ T8477] RSP: 002b:00007fff03e6f3a8 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab [ 68.925110][ T8477] RAX: ffffffffffffffda RBX: 00007fff03e6f3b0 RCX: 0000000000440649 [ 68.933063][ T8477] RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000003 [ 68.941025][ T8477] RBP: 0000000000000004 R08: 0000000000000001 R09: 00007fff03e60031 [ 68.948974][ T8477] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401eb0 [ 68.956936][ T8477] R13: 0000000000401f40 R14: 0000000000000000 R15: 0000000000000000 [ 68.992640][ T8477] BUG: unable to handle page fault for address: fffffffffffffffc [ 69.000423][ T8477] #PF: supervisor read access in kernel mode [ 69.006376][ T8477] #PF: error_code(0x0000) - not-present page [ 69.012377][ T8477] PGD b08f067 P4D b08f067 PUD b091067 PMD 0 [ 69.018345][ T8477] Oops: 0000 [#1] PREEMPT SMP KASAN [ 69.023518][ T8477] CPU: 0 PID: 8477 Comm: syz-executor414 Not tainted 5.11.0-rc2-syzkaller #0 [ 69.032287][ T8477] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.042322][ T8477] RIP: 0010:percpu_ref_exit+0x2f/0x140 [ 69.047765][ T8477] Code: 54 55 53 48 89 fb e8 70 f0 b6 fd 48 8d 6b 08 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 d5 00 00 00 <4c> 8b 73 08 48 89 df e8 c5 fe ff ff 4d 85 f6 0f 84 b3 00 00 00 e8 [ 69.067356][ T8477] RSP: 0018:ffffc90000fdfcc8 EFLAGS: 00010246 [ 69.073400][ T8477] RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: 0000000000000000 [ 69.081350][ T8477] RDX: 1fffffffffffffff RSI: ffffffff83bb8530 RDI: fffffffffffffff4 [ 69.089297][ T8477] RBP: fffffffffffffffc R08: 0000000000000001 R09: ffffffff8ebdb867 [ 69.097245][ T8477] R10: fffffbfff1d7b70c R11: 0000000000000000 R12: 0000000000000000 [ 69.105191][ T8477] R13: ffff8880111cf000 R14: 0000000000000002 R15: fffffffffffffff4 [ 69.113138][ T8477] FS: 0000000000cec880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 [ 69.122047][ T8477] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 69.128627][ T8477] CR2: fffffffffffffffc CR3: 00000000133c0000 CR4: 00000000001506f0 [ 69.136577][ T8477] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 69.144527][ T8477] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 69.152490][ T8477] Call Trace: [ 69.155748][ T8477] io_sqe_files_unregister+0x30b/0x770 [ 69.161194][ T8477] __do_sys_io_uring_register+0x1185/0x4080 [ 69.167067][ T8477] ? ksys_write+0x12d/0x250 [ 69.171548][ T8477] ? lock_downgrade+0x6d0/0x6d0 [ 69.176386][ T8477] ? proc_fail_nth_write+0x95/0x220 [ 69.181562][ T8477] ? proc_task_getattr+0x1e0/0x1e0 [ 69.186651][ T8477] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 69.192871][ T8477] ? vfs_write+0x18e/0xa30 [ 69.197265][ T8477] ? io_file_get+0x8d0/0x8d0 [ 69.201835][ T8477] ? syscall_enter_from_user_mode+0x1d/0x50 [ 69.207709][ T8477] do_syscall_64+0x2d/0x70 [ 69.212100][ T8477] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 69.217973][ T8477] RIP: 0033:0x440649 [ 69.221845][ T8477] 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 [ 69.241456][ T8477] RSP: 002b:00007fff03e6f3a8 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab [ 69.249863][ T8477] RAX: ffffffffffffffda RBX: 00007fff03e6f3b0 RCX: 0000000000440649 [ 69.257810][ T8477] RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000003 [ 69.265757][ T8477] RBP: 0000000000000004 R08: 0000000000000001 R09: 00007fff03e60031 [ 69.273708][ T8477] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401eb0 [ 69.281671][ T8477] R13: 0000000000401f40 R14: 0000000000000000 R15: 0000000000000000 [ 69.289623][ T8477] Modules linked in: [ 69.293489][ T8477] CR2: fffffffffffffffc [ 69.297620][ T8477] ---[ end trace 0f4b0df28761a8bf ]--- [ 69.303046][ T8477] RIP: 0010:percpu_ref_exit+0x2f/0x140 [ 69.308485][ T8477] Code: 54 55 53 48 89 fb e8 70 f0 b6 fd 48 8d 6b 08 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 d5 00 00 00 <4c> 8b 73 08 48 89 df e8 c5 fe ff ff 4d 85 f6 0f 84 b3 00 00 00 e8 [ 69.328069][ T8477] RSP: 0018:ffffc90000fdfcc8 EFLAGS: 00010246 [ 69.334110][ T8477] RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: 0000000000000000 [ 69.342073][ T8477] RDX: 1fffffffffffffff RSI: ffffffff83bb8530 RDI: fffffffffffffff4 [ 69.350021][ T8477] RBP: fffffffffffffffc R08: 0000000000000001 R09: ffffffff8ebdb867 [ 69.357969][ T8477] R10: fffffbfff1d7b70c R11: 0000000000000000 R12: 0000000000000000 [ 69.365931][ T8477] R13: ffff8880111cf000 R14: 0000000000000002 R15: fffffffffffffff4 [ 69.373878][ T8477] FS: 0000000000cec880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 [ 69.382784][ T8477] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 69.389347][ T8477] CR2: fffffffffffffffc CR3: 00000000133c0000 CR4: 00000000001506f0 [ 69.397294][ T8477] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 69.405413][ T8477] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 69.413361][ T8477] Kernel panic - not syncing: Fatal exception [ 69.420113][ T8477] Kernel Offset: disabled [ 69.424435][ T8477] Rebooting in 86400 seconds..