[ 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 '10.128.10.32' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 43.761133] audit: type=1400 audit(1601315126.005:8): avc: denied { execmem } for pid=6468 comm="syz-executor310" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 43.773828] IPVS: ftp: loaded support on port[0] = 21 [ 43.820661] NILFS (loop0): broken superblock, retrying with spare superblock (blocksize = 1024) [ 43.830485] NILFS (loop0): mounting unchecked fs [ 43.848567] NILFS (loop0): recovery complete [ 43.854713] NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 43.872639] WARNING: CPU: 1 PID: 6493 at include/linux/backing-dev.h:339 account_page_dirtied+0x8e9/0xbe0 [ 43.882499] Kernel panic - not syncing: panic_on_warn set ... [ 43.882499] [ 43.889845] CPU: 1 PID: 6493 Comm: segctord Not tainted 4.19.148-syzkaller #0 [ 43.897099] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.906430] Call Trace: [ 43.909006] dump_stack+0x22c/0x33e [ 43.912619] panic+0x2ac/0x565 [ 43.915796] ? __warn_printk+0xf3/0xf3 [ 43.919668] ? account_page_dirtied+0x8e9/0xbe0 [ 43.924318] ? __probe_kernel_read+0x130/0x1b0 [ 43.928894] ? __warn.cold+0x5/0x5a [ 43.932500] ? __warn+0xe4/0x200 [ 43.935855] ? account_page_dirtied+0x8e9/0xbe0 [ 43.940509] __warn.cold+0x20/0x5a [ 43.944036] ? account_page_dirtied+0x8e9/0xbe0 [ 43.948687] report_bug+0x262/0x2b0 [ 43.952312] do_error_trap+0x1e1/0x330 [ 43.956196] ? math_error+0x320/0x320 [ 43.959976] ? mark_held_locks+0xf0/0xf0 [ 43.964014] ? mark_held_locks+0xf0/0xf0 [ 43.968056] ? trace_hardirqs_off_caller+0x69/0x210 [ 43.973165] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.977994] invalid_op+0x14/0x20 [ 43.981449] RIP: 0010:account_page_dirtied+0x8e9/0xbe0 [ 43.986710] Code: 88 01 00 00 be ff ff ff ff 48 8d 78 70 e8 0f 30 c6 ff 31 ff 89 c3 89 c6 e8 34 a5 e0 ff 85 db 0f 85 1c f9 ff ff e8 b7 a3 e0 ff <0f> 0b e9 10 f9 ff ff e8 ab a3 e0 ff 4c 89 e6 4c 89 ef e8 d0 d7 2f [ 44.005592] RSP: 0018:ffff8880a3ed7868 EFLAGS: 00010093 [ 44.010947] RAX: ffff888094c3e380 RBX: 0000000000000000 RCX: ffffffff81911f1c [ 44.018196] RDX: 0000000000000000 RSI: ffffffff81911f29 RDI: 0000000000000005 [ 44.025447] RBP: ffff888082bceb48 R08: 0000000000000000 R09: 0000000000000000 [ 44.032707] R10: 0000000000000005 R11: 000000000000002d R12: ffffea000232f740 [ 44.039958] R13: ffff888082bce9c0 R14: ffff888082bce838 R15: ffffea000232f748 [ 44.047245] ? account_page_dirtied+0x8dc/0xbe0 [ 44.051897] ? account_page_dirtied+0x8e9/0xbe0 [ 44.056552] ? account_page_dirtied+0x8e9/0xbe0 [ 44.061208] __set_page_dirty+0x7f/0x3f0 [ 44.065252] ? lock_page_memcg+0xb4/0x230 [ 44.069383] mark_buffer_dirty+0x442/0x5f0 [ 44.073603] nilfs_btree_propagate+0x72f/0xd80 [ 44.078176] nilfs_bmap_propagate+0x73/0x170 [ 44.082571] nilfs_collect_dat_data+0x45/0xd0 [ 44.087051] nilfs_segctor_apply_buffers+0x14a/0x490 [ 44.092145] ? nilfs_collect_file_bmap+0x70/0x70 [ 44.096887] nilfs_segctor_scan_file+0x3ae/0x6b0 [ 44.101658] ? nilfs_write_file_data_binfo+0x270/0x270 [ 44.106931] nilfs_segctor_do_construct+0x15bf/0x80e0 [ 44.112122] ? nilfs_segctor_scan_file+0x6b0/0x6b0 [ 44.117047] ? lock_downgrade+0x750/0x750 [ 44.121184] ? lock_acquire+0x170/0x3f0 [ 44.125184] ? nilfs_segctor_confirm+0xbc/0x150 [ 44.129865] ? do_raw_spin_unlock+0x171/0x240 [ 44.134347] ? _raw_spin_unlock+0x29/0x40 [ 44.138485] nilfs_segctor_construct+0x764/0xae0 [ 44.143238] nilfs_segctor_thread+0x3cb/0xf50 [ 44.147728] ? nilfs_segctor_construct+0xae0/0xae0 [ 44.152648] ? __kthread_parkme+0x5d/0x1e0 [ 44.156866] ? _raw_spin_unlock_irqrestore+0x7d/0xf0 [ 44.161969] ? wait_woken+0x320/0x320 [ 44.165762] ? _raw_spin_unlock_irqrestore+0x6a/0xf0 [ 44.170858] ? __kthread_parkme+0x133/0x1e0 [ 44.175169] ? nilfs_segctor_construct+0xae0/0xae0 [ 44.180085] kthread+0x33f/0x460 [ 44.183542] ? kthread_park+0x180/0x180 [ 44.187501] ret_from_fork+0x24/0x30 [ 44.192885] Kernel Offset: disabled [ 44.196578] Rebooting in 86400 seconds..