[ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.153' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.564259] FAULT_INJECTION: forcing a failure. [ 38.564259] name failslab, interval 1, probability 0, space 0, times 1 [ 38.575932] CPU: 0 PID: 8113 Comm: syz-executor422 Not tainted 4.19.211-syzkaller #0 [ 38.583836] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.593337] Call Trace: [ 38.595936] dump_stack+0x1fc/0x2ef [ 38.599575] should_fail.cold+0xa/0xf [ 38.603396] ? setup_fault_attr+0x200/0x200 [ 38.607740] ? lock_acquire+0x170/0x3c0 [ 38.611727] __should_failslab+0x115/0x180 [ 38.615974] should_failslab+0x5/0x10 [ 38.619788] kmem_cache_alloc_trace+0x284/0x380 [ 38.624467] device_add+0xe5a/0x16d0 [ 38.628198] ? device_check_offline+0x280/0x280 [ 38.632890] ? disk_release+0x310/0x310 [ 38.636874] __device_add_disk+0x62e/0x10c0 [ 38.641225] ? sprintf+0xc0/0x100 [ 38.644682] ? blk_alloc_devt+0x2d0/0x2d0 [ 38.648839] ? __raw_spin_lock_init+0x28/0x100 [ 38.653456] ? __lockdep_init_map+0x100/0x5a0 [ 38.658087] loop_add+0x628/0x8a0 [ 38.661550] loop_control_ioctl+0x16c/0x480 [ 38.665898] ? loop_lookup+0x1d0/0x1d0 [ 38.669814] ? __vfs_write+0xff/0x770 [ 38.673718] ? proc_tgid_io_accounting+0x7f0/0x7f0 [ 38.678663] ? common_file_perm+0x4e5/0x850 [ 38.682987] ? loop_lookup+0x1d0/0x1d0 [ 38.686896] do_vfs_ioctl+0xcdb/0x12e0 [ 38.690798] ? vfs_write+0x3d7/0x540 [ 38.694523] ? ioctl_preallocate+0x200/0x200 [ 38.698946] ? lock_downgrade+0x720/0x720 [ 38.703117] ? check_preemption_disabled+0x41/0x280 [ 38.708149] ? vfs_write+0x393/0x540 [ 38.711927] ? ksys_write+0x1c8/0x2a0 [ 38.715743] ksys_ioctl+0x9b/0xc0 [ 38.719221] __x64_sys_ioctl+0x6f/0xb0 [ 38.723122] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 38.727728] do_syscall_64+0xf9/0x620 [ 38.731549] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.736747] RIP: 0033:0x7f28b737e079 [ 38.740466] 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 c0 ff ff ff f7 d8 64 89 01 48 [ 38.759554] RSP: 002b:00007ffc4c88f1b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 38.767277] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f28b737e079 [ 38.774559] RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003 [ 38.781841] RBP: 00007ffc4c88f1d0 R08: 0000000000000002 R09: 0000000000000001 [ 38.789122] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 38.796394] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 [ 38.808604] ------------[ cut here ]------------ [ 38.813418] kernel BUG at fs/sysfs/group.c:115! [ 38.820615] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 38.826018] CPU: 1 PID: 8113 Comm: syz-executor422 Not tainted 4.19.211-syzkaller #0 [ 38.833892] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.843263] RIP: 0010:internal_create_group+0x8ef/0xb20 [ 38.848622] Code: fc ff ff e8 33 46 9d ff 48 8b 7c 24 08 e8 99 1f ff ff e9 55 fe ff ff e8 1f 46 9d ff 48 85 db 0f 85 eb f7 ff ff e8 11 46 9d ff <0f> 0b 41 bd ea ff ff ff e9 35 fe ff ff e8 ff 45 9d ff 48 83 7c 24 [ 38.867532] RSP: 0018:ffff8880b152f9f8 EFLAGS: 00010293 [ 38.872905] RAX: ffff888096b84300 RBX: 0000000000000000 RCX: ffffffff81c5372e [ 38.880175] RDX: 0000000000000000 RSI: ffffffff81c53f5f RDI: 0000000000000005 [ 38.887451] RBP: ffff88809d2bee90 R08: 0000000000000000 R09: 0000000000000000 [ 38.894735] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000 [ 38.902018] R13: ffff88809d2bee50 R14: ffff88809d2bee60 R15: 0000000000000000 [ 38.909396] FS: 00005555574b2300(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 38.917648] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.923547] CR2: 0000564cd89018b8 CR3: 00000000a46ec000 CR4: 00000000003406e0 [ 38.930827] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.938112] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.945408] Call Trace: [ 38.948029] ? sysfs_remove_link_from_group+0x70/0x70 [ 38.953254] ? mark_held_locks+0xa6/0xf0 [ 38.957344] ? _raw_spin_unlock_irq+0x24/0x80 [ 38.961863] blk_register_queue+0x12c/0x5b0 [ 38.966224] __device_add_disk+0xe1d/0x10c0 [ 38.970573] ? sprintf+0xc0/0x100 [ 38.974037] ? blk_alloc_devt+0x2d0/0x2d0 [ 38.978206] ? __raw_spin_lock_init+0x28/0x100 [ 38.982814] ? __lockdep_init_map+0x100/0x5a0 [ 38.987433] loop_add+0x628/0x8a0 [ 38.990907] loop_control_ioctl+0x16c/0x480 [ 38.995258] ? loop_lookup+0x1d0/0x1d0 [ 38.999178] ? __vfs_write+0xff/0x770 [ 39.003007] ? proc_tgid_io_accounting+0x7f0/0x7f0 [ 39.007983] ? common_file_perm+0x4e5/0x850 [ 39.012340] ? loop_lookup+0x1d0/0x1d0 [ 39.016257] do_vfs_ioctl+0xcdb/0x12e0 [ 39.020165] ? vfs_write+0x3d7/0x540 [ 39.023906] ? ioctl_preallocate+0x200/0x200 [ 39.029811] ? lock_downgrade+0x720/0x720 [ 39.033983] ? check_preemption_disabled+0x41/0x280 [ 39.039022] ? vfs_write+0x393/0x540 [ 39.042754] ? ksys_write+0x1c8/0x2a0 [ 39.046573] ksys_ioctl+0x9b/0xc0 [ 39.050044] __x64_sys_ioctl+0x6f/0xb0 [ 39.053958] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 39.058557] do_syscall_64+0xf9/0x620 [ 39.062388] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.067602] RIP: 0033:0x7f28b737e079 [ 39.071417] 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 c0 ff ff ff f7 d8 64 89 01 48 [ 39.090482] RSP: 002b:00007ffc4c88f1b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 39.098313] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f28b737e079 [ 39.105623] RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003 [ 39.112912] RBP: 00007ffc4c88f1d0 R08: 0000000000000002 R09: 0000000000000001 [ 39.120292] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 39.127570] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 [ 39.134853] Modules linked in: [ 39.138775] ---[ end trace 0cc945aa565abf82 ]--- [ 39.143579] RIP: 0010:internal_create_group+0x8ef/0xb20 [ 39.149162] Code: fc ff ff e8 33 46 9d ff 48 8b 7c 24 08 e8 99 1f ff ff e9 55 fe ff ff e8 1f 46 9d ff 48 85 db 0f 85 eb f7 ff ff e8 11 46 9d ff <0f> 0b 41 bd ea ff ff ff e9 35 fe ff ff e8 ff 45 9d ff 48 83 7c 24 [ 39.168416] RSP: 0018:ffff8880b152f9f8 EFLAGS: 00010293 [ 39.173787] RAX: ffff888096b84300 RBX: 0000000000000000 RCX: ffffffff81c5372e [ 39.181181] RDX: 0000000000000000 RSI: ffffffff81c53f5f RDI: 0000000000000005 [ 39.188561] RBP: ffff88809d2bee90 R08: 0000000000000000 R09: 0000000000000000 [ 39.195843] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000 [ 39.203240] R13: ffff88809d2bee50 R14: ffff88809d2bee60 R15: 0000000000000000 [ 39.210606] FS: 00005555574b2300(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 39.218952] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.224847] CR2: 0000564cd89018b8 CR3: 00000000a46ec000 CR4: 00000000003406e0 [ 39.232193] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.239559] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.246837] Kernel panic - not syncing: Fatal exception [ 39.252304] Kernel Offset: disabled [ 39.255960] Rebooting in 86400 seconds..