audit: type=1800 audit(1656159295.151:435): pid=27041 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="file1" dev="sda1" ino=14951 res=0 ================================================================== BUG: KASAN: use-after-free in d_inode include/linux/dcache.h:516 [inline] BUG: KASAN: use-after-free in relay_switch_subbuf+0x8cc/0x940 kernel/relay.c:761 Read of size 8 at addr ffff88808da12738 by task syz-executor.2/27041 CPU: 0 PID: 27041 Comm: syz-executor.2 Not tainted 4.19.211-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+0x1fc/0x2ef lib/dump_stack.c:118 audit: type=1800 audit(1656159295.151:436): pid=27041 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="file0" dev="sda1" ino=14987 res=0 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 d_inode include/linux/dcache.h:516 [inline] relay_switch_subbuf+0x8cc/0x940 kernel/relay.c:761 relay_reserve include/linux/relay.h:261 [inline] trace_note+0x5eb/0x750 kernel/trace/blktrace.c:96 trace_note_tsk kernel/trace/blktrace.c:127 [inline] __blk_add_trace+0xb86/0xe20 kernel/trace/blktrace.c:267 blk_add_trace_plug+0xfe/0x240 kernel/trace/blktrace.c:1000 trace_block_plug include/trace/events/block.h:456 [inline] blk_mq_make_request+0x14b7/0x1c00 block/blk-mq.c:1902 audit: type=1804 audit(1656159295.181:437): pid=27041 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir2423442150/syzkaller.eray6H/4165/file0" dev="sda1" ino=14987 res=1 generic_make_request+0x613/0xdf0 block/blk-core.c:2467 submit_bio+0xb1/0x430 block/blk-core.c:2576 dio_bio_submit fs/direct-io.c:481 [inline] do_blockdev_direct_IO fs/direct-io.c:1360 [inline] __blockdev_direct_IO+0xa762/0xef40 fs/direct-io.c:1419 ext4_direct_IO_write fs/ext4/inode.c:3777 [inline] ext4_direct_IO+0xae4/0x1c50 fs/ext4/inode.c:3915 generic_file_direct_write+0x208/0x4a0 mm/filemap.c:3073 __generic_file_write_iter+0x2d0/0x610 mm/filemap.c:3252 ext4_file_write_iter+0x2fe/0xf20 fs/ext4/file.c:272 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fcb2ad00109 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcb29675168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fcb2ae12f60 RCX: 00007fcb2ad00109 RDX: 0000000000000200 RSI: 0000000020000600 RDI: 0000000000000004 RBP: 00007fcb2ad5a05d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd9674f41f R14: 00007fcb29675300 R15: 0000000000022000 Allocated by task 22932: kmem_cache_alloc+0x122/0x370 mm/slab.c:3559 __d_alloc+0x2b/0xa10 fs/dcache.c:1612 d_alloc+0x4a/0x230 fs/dcache.c:1696 d_alloc_parallel+0xeb/0x19e0 fs/dcache.c:2443 __lookup_slow+0x18d/0x4a0 fs/namei.c:1655 lookup_one_len+0x163/0x190 fs/namei.c:2544 start_creating+0xc9/0x220 fs/debugfs/inode.c:313 __debugfs_create_file+0x5e/0x480 fs/debugfs/inode.c:352 relay_create_buf_file+0xf0/0x170 kernel/relay.c:429 relay_open_buf.part.0+0x781/0xb80 kernel/relay.c:458 relay_open_buf kernel/relay.c:450 [inline] relay_open kernel/relay.c:605 [inline] relay_open+0x537/0x9f0 kernel/relay.c:564 do_blk_trace_setup+0x4f6/0xb40 kernel/trace/blktrace.c:566 __blk_trace_setup+0xca/0x180 kernel/trace/blktrace.c:609 blk_trace_ioctl+0x155/0x290 kernel/trace/blktrace.c:750 blkdev_ioctl+0x112/0x1a80 block/ioctl.c:587 block_ioctl+0xe9/0x130 fs/block_dev.c:1906 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8077: __cache_free mm/slab.c:3503 [inline] kmem_cache_free+0x7f/0x260 mm/slab.c:3765 __rcu_reclaim kernel/rcu/rcu.h:236 [inline] rcu_do_batch kernel/rcu/tree.c:2584 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline] rcu_process_callbacks+0x8ff/0x18b0 kernel/rcu/tree.c:2881 __do_softirq+0x265/0x980 kernel/softirq.c:292 The buggy address belongs to the object at ffff88808da126e0 which belongs to the cache dentry of size 288 The buggy address is located 88 bytes inside of 288-byte region [ffff88808da126e0, ffff88808da12800) The buggy address belongs to the page: page:ffffea0002368480 count:1 mapcount:0 mapping:ffff88813be45200 index:0xffff88808da12dc0 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea00026ede48 ffffea0002384a88 ffff88813be45200 raw: ffff88808da12dc0 ffff88808da12000 000000010000000a 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808da12600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88808da12680: 00 00 00 00 fc fc fc fc fc fc fc fc fb fb fb fb >ffff88808da12700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808da12780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808da12800: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ==================================================================