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 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 ------------[ cut here ]------------ generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) WARNING: CPU: 0 PID: 7889 at block/blk-core.c:2180 bio_check_ro block/blk-core.c:2180 [inline] WARNING: CPU: 0 PID: 7889 at block/blk-core.c:2180 generic_make_request_checks+0x1fc5/0x24c0 block/blk-core.c:2285 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 7889 Comm: syz-executor322 Not tainted 4.19.87-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 panic+0x26a/0x50e kernel/panic.c:186 __warn.cold+0x20/0x53 kernel/panic.c:541 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x204/0x360 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037 RIP: 0010:bio_check_ro block/blk-core.c:2180 [inline] RIP: 0010:generic_make_request_checks+0x1fc5/0x24c0 block/blk-core.c:2285 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 RSP: 0018:ffff888088936f08 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff888088936fd8 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81558bd6 RDI: ffffed1011126dd3 RBP: ffff888088937000 R08: ffff8880a5414100 R09: ffffed1015d05079 R10: ffffed1015d05078 R11: ffff8880ae8283c7 R12: ffff888096ab4200 R13: ffff888096ab4208 R14: 0000000000000000 R15: 0000000000000000 generic_make_request+0x24c/0x12d0 block/blk-core.c:2409 submit_bio+0xba/0x480 block/blk-core.c:2573 submit_bh_wbc+0x5dc/0x790 fs/buffer.c:3095 __block_write_full_page+0x76e/0x1010 fs/buffer.c:1766 block_write_full_page+0x21f/0x270 fs/buffer.c:2956 blkdev_writepage+0x25/0x30 fs/block_dev.c:581 __writepage+0x62/0xe0 mm/page-writeback.c:2305 write_cache_pages+0x8ac/0x1560 mm/page-writeback.c:2240 generic_writepages mm/page-writeback.c:2329 [inline] generic_writepages+0xe6/0x160 mm/page-writeback.c:2318 blkdev_writepages+0x1e/0x30 fs/block_dev.c:1965 do_writepages+0xf3/0x2a0 mm/page-writeback.c:2344 __filemap_fdatawrite_range+0x28d/0x370 mm/filemap.c:446 __filemap_fdatawrite mm/filemap.c:454 [inline] filemap_fdatawrite mm/filemap.c:459 [inline] filemap_write_and_wait mm/filemap.c:640 [inline] filemap_write_and_wait+0x47/0xd0 mm/filemap.c:635 __sync_blockdev fs/block_dev.c:463 [inline] sync_blockdev fs/block_dev.c:472 [inline] __blkdev_put+0x204/0x810 fs/block_dev.c:1797 blkdev_put+0x98/0x560 fs/block_dev.c:1866 blkdev_close+0x8b/0xb0 fs/block_dev.c:1873 __fput+0x2dd/0x8b0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x145/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x994/0x3080 kernel/exit.c:876 do_group_exit+0x135/0x370 kernel/exit.c:979 get_signal+0x3ec/0x1fc0 kernel/signal.c:2578 do_signal+0x95/0x1960 arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x445819 Code: Bad RIP value. RSP: 002b:00007f4d0fb52db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00000000006dac38 RCX: 0000000000445819 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dac38 RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c R13: 00007ffc6acaf60f R14: 00007f4d0fb539c0 R15: 20c49ba5e353f7cf Kernel Offset: disabled Rebooting in 86400 seconds..