[ 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 '10.128.0.98' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 552.296576] NILFS (loop0): broken superblock, retrying with spare superblock (blocksize = 1024) [ 552.306587] NILFS (loop0): mounting unchecked fs [ 552.324272] NILFS (loop0): recovery complete [ 552.330184] NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 554.124766] WARNING: CPU: 1 PID: 8099 at include/linux/backing-dev.h:340 account_page_dirtied+0x8cc/0xbb0 [ 554.134594] Kernel panic - not syncing: panic_on_warn set ... [ 554.134594] [ 554.141946] CPU: 1 PID: 8099 Comm: segctord Not tainted 4.19.211-syzkaller #0 [ 554.149198] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 [ 554.158534] Call Trace: [ 554.161123] dump_stack+0x1fc/0x2ef [ 554.164747] panic+0x26a/0x50e [ 554.167935] ? __warn_printk+0xf3/0xf3 [ 554.171817] ? account_page_dirtied+0x8cc/0xbb0 [ 554.176476] ? __probe_kernel_read+0x130/0x1b0 [ 554.181054] ? __warn.cold+0x5/0x5a [ 554.184660] ? __warn+0xe4/0x200 [ 554.188010] ? account_page_dirtied+0x8cc/0xbb0 [ 554.192689] __warn.cold+0x20/0x5a [ 554.196214] ? account_page_dirtied+0x8cc/0xbb0 [ 554.200865] report_bug+0x262/0x2b0 [ 554.204478] do_error_trap+0x1d7/0x310 [ 554.208356] ? math_error+0x310/0x310 [ 554.212149] ? mark_held_locks+0xf0/0xf0 [ 554.216209] ? error_entry+0x72/0xd0 [ 554.219911] ? trace_hardirqs_off_caller+0x2c/0x210 [ 554.224913] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 554.229739] invalid_op+0x14/0x20 [ 554.233177] RIP: 0010:account_page_dirtied+0x8cc/0xbb0 [ 554.238436] Code: 88 01 00 00 be ff ff ff ff 48 8d 78 70 e8 ec e1 ca ff 31 ff 89 c3 89 c6 e8 f1 b3 e2 ff 85 db 0f 85 39 f9 ff ff e8 74 b2 e2 ff <0f> 0b e9 2d f9 ff ff e8 68 b2 e2 ff 4c 89 e6 4c 89 ef e8 9d b3 2d [ 554.257321] RSP: 0018:ffff8880b31d71a8 EFLAGS: 00010093 [ 554.262666] RAX: ffff8880b13ce5c0 RBX: 0000000000000000 RCX: ffffffff817fd2ef [ 554.269915] RDX: 0000000000000000 RSI: ffffffff817fd2fc RDI: 0000000000000005 [ 554.277177] RBP: ffff8880962c2b48 R08: 0000000000000000 R09: 0000000000000000 [ 554.284431] R10: 0000000000000005 R11: 0000000000000000 R12: ffffea0002a1a640 [ 554.291684] R13: ffff8880962c29c0 R14: ffff8880962c2838 R15: ffffea0002a1a648 [ 554.298947] ? account_page_dirtied+0x8bf/0xbb0 [ 554.303597] ? account_page_dirtied+0x8cc/0xbb0 [ 554.308248] ? account_page_dirtied+0x8cc/0xbb0 [ 554.312901] __set_page_dirty+0x7f/0x3e0 [ 554.316957] ? lock_page_memcg+0xa7/0x220 [ 554.321088] mark_buffer_dirty+0x424/0x5c0 [ 554.325320] nilfs_btree_convert_and_insert+0xed5/0x1250 [ 554.330754] ? nilfs_btree_broken_node_block+0x70/0x70 [ 554.336016] ? nilfs_bmap_insert+0x94/0x3f0 [ 554.340320] ? nilfs_direct_gather_data+0xfe/0x160 [ 554.345242] nilfs_bmap_insert+0x2a1/0x3f0 [ 554.349472] ? nilfs_bmap_lookup_contig+0x180/0x180 [ 554.354483] nilfs_mdt_get_block+0x59a/0xd40 [ 554.358880] ? nilfs_mdt_read_block+0x3e0/0x3e0 [ 554.363533] ? lock_downgrade+0x720/0x720 [ 554.367762] ? lock_acquire+0x170/0x3c0 [ 554.371717] ? nilfs_palloc_get_block+0x3a/0x2b0 [ 554.376472] nilfs_palloc_get_block+0xc4/0x2b0 [ 554.381040] nilfs_palloc_get_entry_block+0x17b/0x230 [ 554.386230] ? __radix_tree_lookup+0x216/0x370 [ 554.390798] nilfs_dat_prepare_alloc+0x61/0xb0 [ 554.395378] ? nilfs_bmap_find_target_in_group+0xe/0x170 [ 554.400837] nilfs_direct_insert+0x3cb/0x4e0 [ 554.405259] ? nilfs_direct_delete+0x2d0/0x2d0 [ 554.409837] nilfs_bmap_insert+0x27a/0x3f0 [ 554.414064] ? nilfs_direct_last_key+0xf0/0xf0 [ 554.418630] ? nilfs_bmap_lookup_contig+0x180/0x180 [ 554.423643] ? check_preemption_disabled+0x41/0x280 [ 554.428660] nilfs_mdt_get_block+0x59a/0xd40 [ 554.433083] ? nilfs_mdt_read_block+0x3e0/0x3e0 [ 554.437739] ? lock_acquire+0x170/0x3c0 [ 554.441700] ? check_preemption_disabled+0x41/0x280 [ 554.446707] nilfs_sufile_alloc+0x5b3/0x13f0 [ 554.451107] ? nilfs_sufile_set_alloc_range+0x1d0/0x1d0 [ 554.456456] ? __lockdep_init_map+0x100/0x5a0 [ 554.460945] ? nilfs_sufile_do_free+0x850/0x850 [ 554.465726] ? __lockdep_init_map+0x100/0x5a0 [ 554.470206] nilfs_segctor_do_construct+0x3b54/0x8360 [ 554.475389] ? lock_downgrade+0x720/0x720 [ 554.479526] ? lock_acquire+0x170/0x3c0 [ 554.483483] ? nilfs_segctor_confirm+0x114/0x180 [ 554.488219] ? nilfs_segctor_scan_file+0x6f0/0x6f0 [ 554.493138] ? lock_downgrade+0x720/0x720 [ 554.497274] ? lock_acquire+0x170/0x3c0 [ 554.501245] ? nilfs_segctor_confirm+0xe1/0x180 [ 554.505896] ? do_raw_spin_unlock+0x171/0x230 [ 554.510374] ? _raw_spin_unlock+0x29/0x40 [ 554.514525] nilfs_segctor_construct+0x764/0xae0 [ 554.519284] nilfs_segctor_thread+0x3cb/0xf50 [ 554.523766] ? nilfs_segctor_construct+0xae0/0xae0 [ 554.528685] ? __kthread_parkme+0x5d/0x1e0 [ 554.532903] ? wait_woken+0x250/0x250 [ 554.536700] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 554.541268] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 554.546366] ? __kthread_parkme+0x133/0x1e0 [ 554.550681] ? nilfs_segctor_construct+0xae0/0xae0 [ 554.555592] kthread+0x33f/0x460 [ 554.558943] ? kthread_park+0x180/0x180 [ 554.562910] ret_from_fork+0x24/0x30 [ 554.567036] Kernel Offset: disabled [ 554.570714] Rebooting in 86400 seconds..