[....] Starting periodic command[ 42.212604] audit: type=1800 audit(1575203345.692:32): pid=7702 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 res=0 scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 42.869044] audit: type=1800 audit(1575203346.352:33): pid=7702 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.62' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 52.442137] kauditd_printk_skb: 2 callbacks suppressed [ 52.442160] audit: type=1400 audit(1575203355.922:36): avc: denied { map } for pid=7887 comm="syz-executor322" path="/root/syz-executor322734621" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 52.476450] audit: type=1400 audit(1575203355.962:37): avc: denied { map } for pid=7887 comm="syz-executor322" path="/dev/nullb0" dev="devtmpfs" ino=17394 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:device_t:s0 tclass=blk_file permissive=1 [ 52.506518] ------------[ cut here ]------------ [ 52.511515] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 52.523863] WARNING: CPU: 0 PID: 7889 at block/blk-core.c:2180 generic_make_request_checks+0x1fc5/0x24c0 [ 52.533630] Kernel panic - not syncing: panic_on_warn set ... [ 52.533630] [ 52.541139] CPU: 0 PID: 7889 Comm: syz-executor322 Not tainted 4.19.87-syzkaller #0 [ 52.548981] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.558343] Call Trace: [ 52.560938] dump_stack+0x197/0x210 [ 52.564569] panic+0x26a/0x50e [ 52.567763] ? __warn_printk+0xf3/0xf3 [ 52.571744] ? generic_make_request_checks+0x1fc5/0x24c0 [ 52.577193] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.582745] ? __warn.cold+0x5/0x53 [ 52.586366] ? __warn+0xe8/0x1d0 [ 52.589735] ? generic_make_request_checks+0x1fc5/0x24c0 [ 52.595183] __warn.cold+0x20/0x53 [ 52.598723] ? generic_make_request_checks+0x1fc5/0x24c0 [ 52.604171] report_bug+0x263/0x2b0 [ 52.607800] do_error_trap+0x204/0x360 [ 52.611775] ? math_error+0x340/0x340 [ 52.615692] ? wake_up_klogd+0x99/0xd0 [ 52.619574] ? vprintk_emit+0x2a8/0x6d0 [ 52.623543] ? vprintk_emit+0x1ce/0x6d0 [ 52.627561] ? error_entry+0x7c/0xe0 [ 52.631275] ? trace_hardirqs_off_caller+0x65/0x220 [ 52.636339] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.641184] do_invalid_op+0x1b/0x20 [ 52.644892] invalid_op+0x14/0x20 [ 52.648348] RIP: 0010:generic_make_request_checks+0x1fc5/0x24c0 [ 52.654407] Code: 85 1f 04 00 00 45 8b b6 e4 04 00 00 48 8d 73 a0 4c 89 e7 e8 fd 67 06 00 48 c7 c7 a0 8f e8 87 48 89 c6 44 89 f2 e8 d9 42 f2 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 52.673545] RSP: 0018:ffff888088936f08 EFLAGS: 00010286 [ 52.679082] RAX: 0000000000000000 RBX: ffff888088936fd8 RCX: 0000000000000000 [ 52.686364] RDX: 0000000000000000 RSI: ffffffff81558bd6 RDI: ffffed1011126dd3 [ 52.693644] RBP: ffff888088937000 R08: ffff8880a5414100 R09: ffffed1015d05079 [ 52.700918] R10: ffffed1015d05078 R11: ffff8880ae8283c7 R12: ffff888096ab4200 [ 52.708193] R13: ffff888096ab4208 R14: 0000000000000000 R15: 0000000000000000 [ 52.715526] ? vprintk_func+0x86/0x189 [ 52.719419] ? generic_make_request_checks+0x1fc5/0x24c0 [ 52.724875] ? trace_event_raw_event_block_rq_requeue+0x600/0x600 [ 52.731151] generic_make_request+0x24c/0x12d0 [ 52.735736] ? blk_get_request+0x710/0x710 [ 52.740003] ? guard_bio_eod+0x1da/0x660 [ 52.744066] ? find_held_lock+0x35/0x130 [ 52.748124] ? guard_bio_eod+0x1da/0x660 [ 52.752192] submit_bio+0xba/0x480 [ 52.755908] ? submit_bio+0xba/0x480 [ 52.759935] ? lock_downgrade+0x880/0x880 [ 52.764094] ? generic_make_request+0x12d0/0x12d0 [ 52.768944] ? kasan_check_read+0x11/0x20 [ 52.773105] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 52.778126] ? guard_bio_eod+0x2a1/0x660 [ 52.782347] submit_bh_wbc+0x5dc/0x790 [ 52.786247] __block_write_full_page+0x76e/0x1010 [ 52.791102] ? check_disk_change+0x140/0x140 [ 52.795523] block_write_full_page+0x21f/0x270 [ 52.800108] ? check_disk_change+0x140/0x140 [ 52.804519] blkdev_writepage+0x25/0x30 [ 52.808492] __writepage+0x62/0xe0 [ 52.812076] write_cache_pages+0x8ac/0x1560 [ 52.816406] ? tag_pages_for_writeback+0x320/0x320 [ 52.821342] ? clear_page_dirty_for_io+0xff0/0xff0 [ 52.826269] ? is_bpf_text_address+0xd3/0x170 [ 52.830809] ? __lock_acquire+0x6ee/0x49c0 [ 52.835052] ? __lock_acquire+0x6ee/0x49c0 [ 52.839324] generic_writepages+0xe6/0x160 [ 52.843575] ? write_cache_pages+0x1560/0x1560 [ 52.848189] ? fsnotify_destroy_event+0x69/0x80 [ 52.852871] ? inotify_handle_event+0x463/0x5b0 [ 52.857566] ? wbc_attach_and_unlock_inode+0x51a/0xa00 [ 52.862844] ? find_held_lock+0x35/0x130 [ 52.866941] ? blkdev_readpages+0x40/0x40 [ 52.871089] blkdev_writepages+0x1e/0x30 [ 52.875154] do_writepages+0xf3/0x2a0 [ 52.879011] ? page_writeback_cpu_online+0x20/0x20 [ 52.883941] ? do_raw_spin_unlock+0x178/0x270 [ 52.888471] ? _raw_spin_unlock+0x2d/0x50 [ 52.892619] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 52.898155] ? wbc_attach_and_unlock_inode+0x63c/0xa00 [ 52.903598] __filemap_fdatawrite_range+0x28d/0x370 [ 52.908643] ? delete_from_page_cache_batch+0xec0/0xec0 [ 52.914030] ? fsnotify+0x880/0xf00 [ 52.917665] filemap_write_and_wait+0x47/0xd0 [ 52.922161] __blkdev_put+0x204/0x810 [ 52.925964] ? bd_set_size+0xb0/0xb0 [ 52.929677] ? wait_for_completion+0x440/0x440 [ 52.934269] blkdev_put+0x98/0x560 [ 52.937810] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 52.943350] ? blkdev_put+0x560/0x560 [ 52.947144] blkdev_close+0x8b/0xb0 [ 52.950771] __fput+0x2dd/0x8b0 [ 52.954061] ____fput+0x16/0x20 [ 52.957464] task_work_run+0x145/0x1c0 [ 52.961437] do_exit+0x994/0x3080 [ 52.964948] ? get_signal+0x384/0x1fc0 [ 52.968832] ? mm_update_next_owner+0x660/0x660 [ 52.973546] ? _raw_spin_unlock_irq+0x28/0x90 [ 52.978035] ? get_signal+0x384/0x1fc0 [ 52.981918] ? _raw_spin_unlock_irq+0x28/0x90 [ 52.986413] do_group_exit+0x135/0x370 [ 52.990303] get_signal+0x3ec/0x1fc0 [ 52.994014] ? lock_downgrade+0x880/0x880 [ 52.998161] do_signal+0x95/0x1960 [ 53.001698] ? vm_mmap_pgoff+0x1f1/0x230 [ 53.005751] ? vm_mmap_pgoff+0x107/0x230 [ 53.009865] ? setup_sigcontext+0x7d0/0x7d0 [ 53.014187] ? vma_is_stack_for_current+0xd0/0xd0 [ 53.019020] ? iterate_fd+0x360/0x360 [ 53.022896] ? __x64_sys_futex+0x40d/0x590 [ 53.027127] ? exit_to_usermode_loop+0x43/0x2c0 [ 53.031946] ? do_syscall_64+0x53d/0x620 [ 53.036181] ? exit_to_usermode_loop+0x43/0x2c0 [ 53.040942] ? lockdep_hardirqs_on+0x415/0x5d0 [ 53.045703] ? trace_hardirqs_on+0x67/0x220 [ 53.050029] exit_to_usermode_loop+0x244/0x2c0 [ 53.054613] do_syscall_64+0x53d/0x620 [ 53.058549] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.063735] RIP: 0033:0x445819 [ 53.066935] Code: Bad RIP value. [ 53.070291] RSP: 002b:00007f4d0fb52db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 53.078118] RAX: fffffffffffffe00 RBX: 00000000006dac38 RCX: 0000000000445819 [ 53.085436] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dac38 [ 53.092835] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 53.100225] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c [ 53.107489] R13: 00007ffc6acaf60f R14: 00007f4d0fb539c0 R15: 20c49ba5e353f7cf [ 53.116552] Kernel Offset: disabled [ 53.120374] Rebooting in 86400 seconds..