[ OK ] Found device /dev/ttyS0. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty2. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.55' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 35.495793] BTRFS: device fsid 24c7a497-3402-47dd-bef8-82358f5f30e0 devid 1 transid 8 /dev/loop0 [ 35.520454] BTRFS info (device loop0): using free space tree [ 35.526390] BTRFS info (device loop0): has skinny extents [ 35.570160] FAULT_INJECTION: forcing a failure. [ 35.570160] name failslab, interval 1, probability 0, space 0, times 1 [ 35.581924] CPU: 0 PID: 8113 Comm: syz-executor353 Not tainted 4.19.211-syzkaller #0 [ 35.589902] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 35.599248] Call Trace: [ 35.601857] dump_stack+0x1fc/0x2ef [ 35.605514] should_fail.cold+0xa/0xf [ 35.609307] ? setup_fault_attr+0x200/0x200 [ 35.613619] __should_failslab+0x115/0x180 [ 35.617839] should_failslab+0x5/0x10 [ 35.621629] kmem_cache_alloc+0x277/0x370 [ 35.625775] btrfs_insert_orphan_item+0x8f/0x120 [ 35.630512] ? btrfs_set_lock_blocking_rw+0x360/0x360 [ 35.635684] ? check_preemption_disabled+0x41/0x280 [ 35.640684] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 35.645807] btrfs_orphan_add+0xb5/0x1f0 [ 35.649870] btrfs_rmdir+0x1f9/0x610 [ 35.653573] vfs_rmdir.part.0+0x10f/0x3d0 [ 35.657710] do_rmdir+0x3fd/0x490 [ 35.661156] ? __ia32_sys_mkdir+0x80/0x80 [ 35.665287] ? ksys_write+0x1c8/0x2a0 [ 35.669073] ? trace_hardirqs_off_caller+0x6e/0x210 [ 35.674081] ? do_syscall_64+0x21/0x620 [ 35.678039] do_syscall_64+0xf9/0x620 [ 35.681822] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.686990] RIP: 0033:0x7f8d20dbfd79 [ 35.690683] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 17 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 [ 35.709561] RSP: 002b:00007ffffd622d58 EFLAGS: 00000246 ORIG_RAX: 0000000000000054 [ 35.717250] RAX: ffffffffffffffda RBX: 00007ffffd622d98 RCX: 00007f8d20dbfd79 [ 35.724562] RDX: 0000000000000d60 RSI: 000000000000c0fe RDI: 0000000020000100 [ 35.731811] RBP: 00007ffffd622d60 R08: 0000000000000001 R09: 0000000000000034 [ 35.739334] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 35.746592] R13: 00007f8d20dfb0e8 R14: 0000000000000000 R15: 0000000000000000 [ 35.754858] ------------[ cut here ]------------ [ 35.759918] WARNING: CPU: 0 PID: 8113 at fs/btrfs/inode.c:3380 btrfs_orphan_add+0x19e/0x1f0 [ 35.768546] Kernel panic - not syncing: panic_on_warn set ... [ 35.768546] [ 35.775905] CPU: 0 PID: 8113 Comm: syz-executor353 Not tainted 4.19.211-syzkaller #0 [ 35.783766] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 35.793100] Call Trace: [ 35.795673] dump_stack+0x1fc/0x2ef [ 35.799281] panic+0x26a/0x50e [ 35.802457] ? __warn_printk+0xf3/0xf3 [ 35.806333] ? btrfs_orphan_add+0x19e/0x1f0 [ 35.810647] ? __probe_kernel_read+0x130/0x1b0 [ 35.815209] ? __warn.cold+0x5/0x5a [ 35.818812] ? __warn+0xe4/0x200 [ 35.822158] ? btrfs_orphan_add+0x19e/0x1f0 [ 35.826461] __warn.cold+0x20/0x5a [ 35.829981] ? btrfs_orphan_add+0x19e/0x1f0 [ 35.834283] report_bug+0x262/0x2b0 [ 35.837892] do_error_trap+0x1d7/0x310 [ 35.841757] ? math_error+0x310/0x310 [ 35.845537] ? irq_work_claim+0xa6/0xc0 [ 35.849491] ? irq_work_queue+0x29/0x80 [ 35.853536] ? error_entry+0x72/0xd0 [ 35.857227] ? trace_hardirqs_off_caller+0x6e/0x210 [ 35.862320] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.867148] invalid_op+0x14/0x20 [ 35.870608] RIP: 0010:btrfs_orphan_add+0x19e/0x1f0 [ 35.875515] Code: 89 e6 bf fb ff ff ff e8 90 d1 79 fe 41 83 fc fb 0f 84 3e bb 11 05 e8 11 d0 79 fe 44 89 e6 48 c7 c7 40 c3 a4 88 e8 e7 07 0a 05 <0f> 0b e8 fb cf 79 fe 44 89 e1 ba 34 0d 00 00 48 89 ef 48 c7 c6 a0 [ 35.894481] RSP: 0018:ffff888090507d80 EFLAGS: 00010286 [ 35.899820] RAX: 0000000000000000 RBX: ffff88808b07e000 RCX: 0000000000000000 [ 35.907086] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed10120a0fa2 [ 35.914340] RBP: ffff88808b07d150 R08: 0000000000000001 R09: 0000000000000000 [ 35.921588] R10: 0000000000000005 R11: 0000000000000000 R12: 00000000fffffff4 [ 35.928862] R13: ffff88808b07d1a0 R14: ffff88808b02d4f0 R15: ffff8880b148eac0 [ 35.936123] ? vprintk_func+0x81/0x180 [ 35.939998] btrfs_rmdir+0x1f9/0x610 [ 35.943705] vfs_rmdir.part.0+0x10f/0x3d0 [ 35.947838] do_rmdir+0x3fd/0x490 [ 35.951284] ? __ia32_sys_mkdir+0x80/0x80 [ 35.955429] ? ksys_write+0x1c8/0x2a0 [ 35.959326] ? trace_hardirqs_off_caller+0x6e/0x210 [ 35.964327] ? do_syscall_64+0x21/0x620 [ 35.968286] do_syscall_64+0xf9/0x620 [ 35.972071] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.977936] RIP: 0033:0x7f8d20dbfd79 [ 35.981628] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 17 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 [ 36.000512] RSP: 002b:00007ffffd622d58 EFLAGS: 00000246 ORIG_RAX: 0000000000000054 [ 36.008200] RAX: ffffffffffffffda RBX: 00007ffffd622d98 RCX: 00007f8d20dbfd79 [ 36.015549] RDX: 0000000000000d60 RSI: 000000000000c0fe RDI: 0000000020000100 [ 36.022804] RBP: 00007ffffd622d60 R08: 0000000000000001 R09: 0000000000000034 [ 36.030060] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 36.037436] R13: 00007f8d20dfb0e8 R14: 0000000000000000 R15: 0000000000000000 [ 36.045140] Kernel Offset: disabled [ 36.048805] Rebooting in 86400 seconds..