[ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.109' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.712453] NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 27.720433] kasan: CONFIG_KASAN_INLINE enabled [ 27.727002] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.734652] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.740870] Modules linked in: [ 27.744040] CPU: 0 PID: 7978 Comm: syz-executor290 Not tainted 4.14.302-syzkaller #0 [ 27.751892] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 27.761219] task: ffff8880ab7c6640 task.stack: ffff8880924b8000 [ 27.767264] RIP: 0010:nilfs_btree_insert+0x4e8/0x1960 [ 27.772431] RSP: 0018:ffff8880924bf680 EFLAGS: 00010206 [ 27.778318] RAX: 0000000000000005 RBX: 0000000000000002 RCX: 0000000000000000 [ 27.785561] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000028 [ 27.792804] RBP: dffffc0000000000 R08: ffffffff8b9a7040 R09: 0000000000000005 [ 27.800045] R10: 0000000000000000 R11: ffff8880ab7c6640 R12: 0000000000000000 [ 27.807285] R13: 0000000000000003 R14: 0000000000000000 R15: ffff8880a1a81878 [ 27.814554] FS: 0000555557325300(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 27.822768] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.828623] CR2: 0000558bc38691e0 CR3: 00000000a45ea000 CR4: 00000000003406f0 [ 27.835868] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.843222] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.850464] Call Trace: [ 27.853033] ? nilfs_btree_lookup_contig+0x9d0/0x9d0 [ 27.858110] nilfs_bmap_insert+0x21b/0x380 [ 27.862317] ? nilfs_bmap_lookup_contig+0x170/0x170 [ 27.867302] ? nilfs_get_block+0x210/0x7a0 [ 27.871511] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 27.876937] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 27.881928] ? nilfs_transaction_begin+0x274/0xa00 [ 27.886829] nilfs_get_block+0x434/0x7a0 [ 27.890864] ? __nilfs_mark_inode_dirty+0x1d0/0x1d0 [ 27.895852] ? create_empty_buffers+0x282/0x470 [ 27.900491] ? do_raw_spin_unlock+0x164/0x220 [ 27.904959] ? _raw_spin_unlock+0x29/0x40 [ 27.909080] ? create_page_buffers+0xce/0x1c0 [ 27.913550] __block_write_begin_int+0x35c/0x11d0 [ 27.918363] ? __nilfs_mark_inode_dirty+0x1d0/0x1d0 [ 27.923353] ? __breadahead_gfp+0x150/0x150 [ 27.927647] ? wait_for_stable_page+0xe3/0x260 [ 27.932202] ? __nilfs_mark_inode_dirty+0x1d0/0x1d0 [ 27.937189] block_write_begin+0x58/0x270 [ 27.941310] nilfs_write_begin+0x95/0x1c0 [ 27.945437] generic_perform_write+0x1d5/0x430 [ 27.949994] ? filemap_page_mkwrite+0x2d0/0x2d0 [ 27.954675] ? current_time+0xb0/0xb0 [ 27.958448] ? lock_acquire+0x170/0x3f0 [ 27.962396] __generic_file_write_iter+0x227/0x590 [ 27.967299] generic_file_write_iter+0x36f/0x650 [ 27.972028] ? iov_iter_init+0xa6/0x1c0 [ 27.975975] __vfs_write+0x44c/0x630 [ 27.979667] ? kernel_read+0x110/0x110 [ 27.983533] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 27.988540] vfs_write+0x17f/0x4d0 [ 27.992053] SyS_write+0xf2/0x210 [ 27.995477] ? SyS_read+0x210/0x210 [ 27.999079] ? do_syscall_64+0x4c/0x640 [ 28.003023] ? SyS_read+0x210/0x210 [ 28.006623] do_syscall_64+0x1d5/0x640 [ 28.010485] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 28.015648] RIP: 0033:0x7f0c80a8bb79 [ 28.019330] RSP: 002b:00007fff0cc1a5c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 28.027009] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0c80a8bb79 [ 28.034250] RDX: 000000000000002f RSI: 0000000020000040 RDI: 0000000000000004 [ 28.041493] RBP: 00007f0c80a4b180 R08: 0000000000000014 R09: 0000000000000000 [ 28.048736] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0c80a4b210 [ 28.055981] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 28.063230] Code: df 9d e7 fe 49 8d 47 c8 48 89 44 24 30 48 c1 e8 03 80 3c 28 00 0f 85 0c 11 00 00 4d 8b 67 c8 49 8d 7c 24 28 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 9d 10 00 00 4d 8b 64 24 28 49 8d 7c 24 02 48 [ 28.082292] RIP: nilfs_btree_insert+0x4e8/0x1960 RSP: ffff8880924bf680 [ 28.089428] ---[ end trace c8792a66f25c4d36 ]--- [ 28.094183] Kernel panic - not syncing: Fatal exception [ 28.099583] Kernel Offset: disabled [ 28.103190] Rebooting in 86400 seconds..