================================================================== 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 ffff88808d919cb8 by task syz-executor.1/21372 CPU: 1 PID: 21372 Comm: syz-executor.1 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 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 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] dio_send_cur_page fs/direct-io.c:815 [inline] submit_page_section fs/direct-io.c:883 [inline] do_direct_IO fs/direct-io.c:1097 [inline] do_blockdev_direct_IO fs/direct-io.c:1333 [inline] __blockdev_direct_IO+0x81ba/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] do_iter_readv_writev+0x668/0x790 fs/read_write.c:681 do_iter_write+0x182/0x5d0 fs/read_write.c:960 vfs_writev+0x153/0x2e0 fs/read_write.c:1005 do_pwritev+0x1b6/0x270 fs/read_write.c:1094 __do_sys_pwritev2 fs/read_write.c:1153 [inline] __se_sys_pwritev2 fs/read_write.c:1144 [inline] __x64_sys_pwritev2+0xeb/0x150 fs/read_write.c:1144 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f8cd62a5059 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:00007f8cd4c1a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007f8cd63b7f60 RCX: 00007f8cd62a5059 RDX: 0000000000000001 RSI: 0000000020000240 RDI: 0000000000000006 RBP: 00007f8cd62ff08d R08: 0000000000000000 R09: 0000000000000003 R10: 0000000000001400 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdb7aff91f R14: 00007f8cd4c1a300 R15: 0000000000022000 Allocated by task 21056: 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 proc_fill_cache+0x2e8/0x490 fs/proc/base.c:1893 proc_readfd_common+0x608/0xb90 fs/proc/fd.c:261 iterate_dir+0x473/0x5c0 fs/readdir.c:51 __do_sys_getdents fs/readdir.c:271 [inline] __se_sys_getdents+0x175/0x2d0 fs/readdir.c:252 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 18: __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 ffff88808d919c60 which belongs to the cache dentry of size 288 The buggy address is located 88 bytes inside of 288-byte region [ffff88808d919c60, ffff88808d919d80) The buggy address belongs to the page: page:ffffea0002364640 count:1 mapcount:0 mapping:ffff88813be45200 index:0x0 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea0002364248 ffffea0002b745c8 ffff88813be45200 raw: 0000000000000000 ffff88808d919000 000000010000000b 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808d919b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88808d919c00: 00 00 00 00 fc fc fc fc fc fc fc fc fb fb fb fb >ffff88808d919c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808d919d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808d919d80: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ==================================================================