[ 79.016369][ T27] audit: type=1800 audit(1584474655.716:25): pid=9970 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 80.018604][ T27] kauditd_printk_skb: 3 callbacks suppressed [ 80.018614][ T27] audit: type=1800 audit(1584474656.716:29): pid=9970 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 80.063350][ T27] audit: type=1800 audit(1584474656.716:30): pid=9970 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.93' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 91.262915][T10124] IPVS: ftp: loaded support on port[0] = 21 [ 91.367027][ T170] ------------[ cut here ]------------ [ 91.372728][ T170] WARNING: CPU: 1 PID: 170 at include/linux/sched/mm.h:323 alloc_page_buffers+0x41f/0x590 [ 91.382623][ T170] Kernel panic - not syncing: panic_on_warn set ... [ 91.389340][ T170] CPU: 1 PID: 170 Comm: kworker/u4:4 Not tainted 5.6.0-rc3-next-20200228-syzkaller #0 [ 91.398875][ T170] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 91.409113][ T170] Workqueue: loop-2074257985 loop_workfn [ 91.414858][ T170] Call Trace: [ 91.418167][ T170] dump_stack+0x188/0x20d [ 91.422506][ T170] ? alloc_page_buffers+0x3c0/0x590 [ 91.427746][ T170] panic+0x2e3/0x75c [ 91.431634][ T170] ? add_taint.cold+0x16/0x16 [ 91.436314][ T170] ? printk+0xba/0xed [ 91.440286][ T170] ? kmsg_dump_rewind_nolock+0xd9/0xd9 [ 91.445752][ T170] ? __warn.cold+0x14/0x35 [ 91.450175][ T170] ? __warn+0xd5/0x1c8 [ 91.454241][ T170] ? alloc_page_buffers+0x41f/0x590 [ 91.459441][ T170] __warn.cold+0x2f/0x35 [ 91.463691][ T170] ? alloc_page_buffers+0x41f/0x590 [ 91.468913][ T170] report_bug+0x27b/0x2f0 [ 91.473314][ T170] do_error_trap+0x12b/0x220 [ 91.477958][ T170] ? alloc_page_buffers+0x41f/0x590 [ 91.483157][ T170] do_invalid_op+0x32/0x40 [ 91.487681][ T170] ? alloc_page_buffers+0x41f/0x590 [ 91.492873][ T170] invalid_op+0x23/0x30 [ 91.497168][ T170] RIP: 0010:alloc_page_buffers+0x41f/0x590 [ 91.502974][ T170] Code: 39 a9 ff e8 e3 fb 96 ff e8 3e 39 a9 ff 48 c7 c6 33 5c c9 81 48 c7 c7 80 dc 9a 89 e8 9b 9d 8f ff e9 a3 fe ff ff e8 21 39 a9 ff <0f> 0b e9 61 fc ff ff e8 15 39 a9 ff e8 30 41 96 ff 31 ff 89 c3 89 [ 91.522669][ T170] RSP: 0018:ffffc90001607110 EFLAGS: 00010293 [ 91.528721][ T170] RAX: ffff8880a8820440 RBX: ffff8880a8820440 RCX: 1ffff1101510419a [ 91.536737][ T170] RDX: 0000000000000000 RSI: ffffffff81c95c5f RDI: ffff8880a8821808 [ 91.544754][ T170] RBP: ffffea000239c480 R08: ffff8880a8820440 R09: fffffbfff150c429 [ 91.552745][ T170] R10: fffffbfff150c428 R11: ffffffff8a862147 R12: 0000000000001000 [ 91.560711][ T170] R13: 0000000000001000 R14: 0000000000408c40 R15: ffffea000239c480 [ 91.568690][ T170] ? alloc_page_buffers+0x41f/0x590 [ 91.573881][ T170] create_empty_buffers+0x2c/0x8c0 [ 91.578996][ T170] create_page_buffers+0x2b0/0x400 [ 91.584105][ T170] __block_write_full_page+0xf7/0x11b0 [ 91.589575][ T170] ? block_commit_write+0x30/0x30 [ 91.594664][ T170] ? bdev_evict_inode+0x580/0x580 [ 91.599688][ T170] block_write_full_page+0x21a/0x270 [ 91.605054][ T170] ? bdev_evict_inode+0x580/0x580 [ 91.610087][ T170] __writepage+0x62/0x100 [ 91.614424][ T170] write_cache_pages+0x799/0x12f0 [ 91.619450][ T170] ? tag_pages_for_writeback+0x420/0x420 [ 91.625100][ T170] ? clear_page_dirty_for_io+0xdc0/0xdc0 [ 91.630735][ T170] ? lock_downgrade+0x7f0/0x7f0 [ 91.635687][ T170] ? dd_dispatch_request+0x8b0/0x8b0 [ 91.640984][ T170] ? blk_mq_sched_insert_requests+0x3c2/0x5f0 [ 91.647059][ T170] ? blk_mq_flush_plug_list+0x466/0x880 [ 91.652624][ T170] generic_writepages+0xed/0x160 [ 91.657552][ T170] ? write_cache_pages+0x12f0/0x12f0 [ 91.662882][ T170] ? __lock_acquire+0x18c3/0x5270 [ 91.667916][ T170] ? find_held_lock+0x2d/0x110 [ 91.672683][ T170] ? blkdev_readpages+0x30/0x30 [ 91.677576][ T170] do_writepages+0xfa/0x2a0 [ 91.682086][ T170] ? mark_held_locks+0xe0/0xe0 [ 91.686853][ T170] ? page_writeback_cpu_online+0x10/0x10 [ 91.692530][ T170] ? do_raw_spin_unlock+0x171/0x260 [ 91.697755][ T170] ? _raw_spin_unlock+0x24/0x40 [ 91.702624][ T170] __filemap_fdatawrite_range+0x2aa/0x390 [ 91.708409][ T170] ? delete_from_page_cache_batch+0xec0/0xec0 [ 91.714492][ T170] ? 0xffffffff81000000 [ 91.718739][ T170] ? alloc_list_entry+0xb0/0xb0 [ 91.723603][ T170] filemap_write_and_wait_range+0xf7/0x1e0 [ 91.729464][ T170] generic_file_read_iter+0x11bd/0x2a40 [ 91.735061][ T170] ? find_held_lock+0x2d/0x110 [ 91.739822][ T170] ? debug_object_activate+0x201/0x470 [ 91.745293][ T170] ? filemap_write_and_wait_range+0x1e0/0x1e0 [ 91.751390][ T170] ? lock_acquire+0x197/0x420 [ 91.756162][ T170] ? debug_object_activate+0x131/0x470 [ 91.761609][ T170] ? mark_lock+0xbc/0x1220 [ 91.766021][ T170] blkdev_read_iter+0x11b/0x180 [ 91.770869][ T170] lo_rw_aio+0xc96/0xf20 [ 91.775115][ T170] ? loop_set_fd+0x1540/0x1540 [ 91.779870][ T170] ? mark_lock+0xbc/0x1220 [ 91.784280][ T170] ? mark_held_locks+0x9f/0xe0 [ 91.789045][ T170] ? _raw_spin_unlock_irq+0x1f/0x80 [ 91.794229][ T170] loop_process_work+0x147b/0x29d0 [ 91.799365][ T170] ? find_held_lock+0x2d/0x110 [ 91.804118][ T170] ? find_held_lock+0x2d/0x110 [ 91.808875][ T170] ? loop_free_idle_workers+0x610/0x610 [ 91.814472][ T170] ? mark_held_locks+0xe0/0xe0 [ 91.819372][ T170] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 91.824938][ T170] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 91.830951][ T170] process_one_work+0x94b/0x1690 [ 91.835968][ T170] ? pwq_dec_nr_in_flight+0x310/0x310 [ 91.841386][ T170] ? do_raw_spin_lock+0x129/0x2e0 [ 91.846432][ T170] worker_thread+0x96/0xe20 [ 91.850956][ T170] ? process_one_work+0x1690/0x1690 [ 91.856157][ T170] kthread+0x357/0x430 [ 91.860232][ T170] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 91.865948][ T170] ret_from_fork+0x24/0x30 [ 91.871712][ T170] Kernel Offset: disabled [ 91.876140][ T170] Rebooting in 86400 seconds..