[ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Found device /dev/ttyS0. [ 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 '10.128.0.70' (ECDSA) to the list of known hosts. syzkaller login: [ 33.564647] IPVS: ftp: loaded support on port[0] = 21 executing program [ 33.688347] NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 33.726500] WARNING: CPU: 1 PID: 8113 at include/linux/backing-dev.h:340 account_page_dirtied+0x8cc/0xbb0 [ 33.736659] Kernel panic - not syncing: panic_on_warn set ... [ 33.736659] [ 33.744095] CPU: 1 PID: 8113 Comm: segctord Not tainted 4.19.211-syzkaller #0 [ 33.751449] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 [ 33.760789] Call Trace: [ 33.763452] dump_stack+0x1fc/0x2ef [ 33.767072] panic+0x26a/0x50e [ 33.770251] ? __warn_printk+0xf3/0xf3 [ 33.774147] ? account_page_dirtied+0x8cc/0xbb0 [ 33.779328] ? __probe_kernel_read+0x130/0x1b0 [ 33.784339] ? __warn.cold+0x5/0x5a [ 33.787962] ? __warn+0xe4/0x200 [ 33.791422] ? account_page_dirtied+0x8cc/0xbb0 [ 33.796076] __warn.cold+0x20/0x5a [ 33.799617] ? account_page_dirtied+0x8cc/0xbb0 [ 33.804274] report_bug+0x262/0x2b0 [ 33.807902] do_error_trap+0x1d7/0x310 [ 33.811772] ? math_error+0x310/0x310 [ 33.815817] ? nilfs_segctor_construct+0x764/0xae0 [ 33.820746] ? nilfs_segctor_thread+0x3cb/0xf50 [ 33.825402] ? mark_held_locks+0xf0/0xf0 [ 33.829452] ? error_entry+0x72/0xd0 [ 33.833155] ? trace_hardirqs_off_caller+0x2c/0x210 [ 33.838151] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.843063] invalid_op+0x14/0x20 [ 33.846589] RIP: 0010:account_page_dirtied+0x8cc/0xbb0 [ 33.851871] 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 [ 33.870771] RSP: 0018:ffff888098257868 EFLAGS: 00010093 [ 33.876116] RAX: ffff8880b2b2c4c0 RBX: 0000000000000000 RCX: ffffffff817fd2ef [ 33.883383] RDX: 0000000000000000 RSI: ffffffff817fd2fc RDI: 0000000000000005 [ 33.890633] RBP: ffff88808d375b48 R08: 0000000000000000 R09: 0000000000000000 [ 33.897888] R10: 0000000000000005 R11: 0000000000000000 R12: ffffea00026cbbc0 [ 33.905138] R13: ffff88808d3759c0 R14: ffff88808d375838 R15: ffffea00026cbbc8 [ 33.912420] ? account_page_dirtied+0x8bf/0xbb0 [ 33.917157] ? account_page_dirtied+0x8cc/0xbb0 [ 33.921826] ? account_page_dirtied+0x8cc/0xbb0 [ 33.926479] __set_page_dirty+0x7f/0x3e0 [ 33.930522] ? lock_page_memcg+0xa7/0x220 [ 33.934678] mark_buffer_dirty+0x424/0x5c0 [ 33.938895] nilfs_btree_propagate+0x728/0xd80 [ 33.943476] nilfs_bmap_propagate+0x73/0x170 [ 33.947889] nilfs_collect_dat_data+0x45/0xd0 [ 33.952367] nilfs_segctor_apply_buffers+0x14a/0x490 [ 33.957471] ? nilfs_collect_file_bmap+0x70/0x70 [ 33.962211] nilfs_segctor_scan_file+0x475/0x6f0 [ 33.966950] ? nilfs_collect_file_data+0xd0/0xd0 [ 33.971713] ? check_preemption_disabled+0x41/0x280 [ 33.976737] nilfs_segctor_do_construct+0x1562/0x8360 [ 33.982027] ? nilfs_segctor_scan_file+0x6f0/0x6f0 [ 33.986943] ? lock_downgrade+0x720/0x720 [ 33.991097] ? lock_acquire+0x170/0x3c0 [ 33.995159] ? nilfs_segctor_confirm+0xe1/0x180 [ 33.999819] ? do_raw_spin_unlock+0x171/0x230 [ 34.004303] ? _raw_spin_unlock+0x29/0x40 [ 34.008438] nilfs_segctor_construct+0x764/0xae0 [ 34.013192] nilfs_segctor_thread+0x3cb/0xf50 [ 34.017821] ? nilfs_segctor_construct+0xae0/0xae0 [ 34.022756] ? __kthread_parkme+0x5d/0x1e0 [ 34.026982] ? wait_woken+0x250/0x250 [ 34.030823] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 34.035393] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 34.040490] ? __kthread_parkme+0x133/0x1e0 [ 34.044805] ? nilfs_segctor_construct+0xae0/0xae0 [ 34.049743] kthread+0x33f/0x460 [ 34.053093] ? kthread_park+0x180/0x180 [ 34.057051] ret_from_fork+0x24/0x30 [ 34.061206] Kernel Offset: disabled [ 34.064886] Rebooting in 86400 seconds..