EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue ================================================================== EXT4-fs (loop2): mounted filesystem without journal. Opts: sb=0x0000000000000001,,errors=continue 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 ffff88808c894318 by task systemd-udevd/4697 CPU: 0 PID: 4697 Comm: systemd-udevd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 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 audit: type=1804 audit(1667734847.142:653): pid=20957 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir2694487930/syzkaller.9qD4Ho/1462/bus" dev="sda1" ino=14952 res=1 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_rq+0x36e/0x470 kernel/trace/blktrace.c:858 trace_block_rq_complete include/trace/events/block.h:116 [inline] blk_update_request+0x74c/0xaf0 block/blk-core.c:3091 scsi_end_request+0x7d/0xb60 drivers/scsi/scsi_lib.c:673 scsi_io_completion+0x852/0x17c0 drivers/scsi/scsi_lib.c:1103 scsi_softirq_done+0x336/0x3d0 drivers/scsi/scsi_lib.c:1759 __blk_mq_complete_request block/blk-mq.c:583 [inline] blk_mq_complete_request+0x472/0x660 block/blk-mq.c:620 virtscsi_vq_done drivers/scsi/virtio_scsi.c:223 [inline] virtscsi_req_done+0x14b/0x210 drivers/scsi/virtio_scsi.c:238 vring_interrupt+0x12f/0x220 drivers/virtio/virtio_ring.c:953 __handle_irq_event_percpu+0x27e/0x8e0 kernel/irq/handle.c:149 handle_irq_event_percpu kernel/irq/handle.c:189 [inline] handle_irq_event+0x102/0x290 kernel/irq/handle.c:206 handle_edge_irq+0x260/0xcf0 kernel/irq/chip.c:800 generic_handle_irq_desc include/linux/irqdesc.h:155 [inline] handle_irq+0x35/0x50 arch/x86/kernel/irq_64.c:87 do_IRQ+0x93/0x1c0 arch/x86/kernel/irq.c:246 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:670 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x50 kernel/kcov.c:100 Code: e8 11 dd 35 00 e9 ab fe ff ff 4c 89 ef e8 04 dd 35 00 e9 23 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 34 24 <65> 48 8b 04 25 c0 df 01 00 65 8b 15 cc 59 9f 7e 81 e2 00 01 1f 00 RSP: 0018:ffff88809c57fa50 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffd9 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81a552b5 RDX: 0000000000000000 RSI: ffffffff81a552bf RDI: 0000000000000005 RBP: ffff8880a3d10b60 R08: ffffffff8cd22848 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000081 R14: ffff8880a3d10b62 R15: ffff88809a6da6a5 devcgroup_inode_permission include/linux/device_cgroup.h:39 [inline] inode_permission.part.0+0xaf/0x450 fs/namei.c:455 inode_permission fs/namei.c:432 [inline] may_lookup fs/namei.c:1697 [inline] link_path_walk.part.0+0x1a0/0x1230 fs/namei.c:2085 link_path_walk fs/namei.c:2270 [inline] path_lookupat+0xe4/0x8d0 fs/namei.c:2318 filename_lookup+0x1ac/0x5a0 fs/namei.c:2349 do_readlinkat+0xcd/0x2f0 fs/stat.c:394 __do_sys_readlink fs/stat.c:427 [inline] __se_sys_readlink fs/stat.c:424 [inline] __x64_sys_readlink+0x74/0xb0 fs/stat.c:424 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fe25adf9087 Code: 73 01 c3 48 8b 0d 11 be 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 bd 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffcf401ff48 EFLAGS: 00000293 ORIG_RAX: 0000000000000059 RAX: ffffffffffffffda RBX: 00007ffcf401ffe0 RCX: 00007fe25adf9087 RDX: 0000000000000200 RSI: 00007ffcf40200f0 RDI: 00007ffcf401ffc0 RBP: 00007ffcf4020548 R08: 0000000000000001 R09: 0000000000000014 R10: 0000000000000064 R11: 0000000000000293 R12: 00007ffcf40200f0 R13: 000055feb3a56010 R14: 000055feb3a560e0 R15: 00007ffcf401ffc0 Allocated by task 16357: kmem_cache_alloc+0x122/0x370 mm/slab.c:3559 __d_alloc+0x2b/0xa10 fs/dcache.c:1612 d_alloc_pseudo+0x19/0x70 fs/dcache.c:1743 alloc_file_pseudo+0xc6/0x250 fs/file_table.c:224 sock_alloc_file+0x48/0x180 net/socket.c:406 sock_map_fd net/socket.c:429 [inline] __sys_socket+0x13d/0x200 net/socket.c:1462 __do_sys_socket net/socket.c:1467 [inline] __se_sys_socket net/socket.c:1465 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1465 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 16331: __cache_free mm/slab.c:3503 [inline] kmem_cache_free+0x7f/0x260 mm/slab.c:3765 __d_free fs/dcache.c:257 [inline] dentry_free+0xda/0x150 fs/dcache.c:348 __dentry_kill+0x4c6/0x640 fs/dcache.c:580 dentry_kill+0xc4/0x510 fs/dcache.c:685 dput+0x55f/0x640 fs/dcache.c:846 __fput+0x415/0x890 fs/file_table.c:291 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808c8942c0 which belongs to the cache dentry of size 288 The buggy address is located 88 bytes inside of 288-byte region [ffff88808c8942c0, ffff88808c8943e0) The buggy address belongs to the page: page:ffffea0002322500 count:1 mapcount:0 mapping:ffff88813be45200 index:0xffff88808c894c60 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea0002329a08 ffffea0002399b48 ffff88813be45200 raw: ffff88808c894c60 ffff88808c894000 0000000100000008 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808c894200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808c894280: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff88808c894300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808c894380: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88808c894400: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: e8 11 dd 35 00 callq 0x35dd16 5: e9 ab fe ff ff jmpq 0xfffffeb5 a: 4c 89 ef mov %r13,%rdi d: e8 04 dd 35 00 callq 0x35dd16 12: e9 23 fe ff ff jmpq 0xfffffe3a 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 90 nop 22: 90 nop 23: 90 nop 24: 90 nop 25: 90 nop 26: 48 8b 34 24 mov (%rsp),%rsi * 2a: 65 48 8b 04 25 c0 df mov %gs:0x1dfc0,%rax <-- trapping instruction 31: 01 00 33: 65 8b 15 cc 59 9f 7e mov %gs:0x7e9f59cc(%rip),%edx # 0x7e9f5a06 3a: 81 e2 00 01 1f 00 and $0x1f0100,%edx