audit: type=1804 audit(1593133298.984:150): pid=346 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir304699807/syzkaller.GI7liT/873/cgroup.controllers" dev="sda1" ino=16702 res=1 ================================================================== 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:760 Read of size 8 at addr ffff888083be3738 by task kauditd/28 CPU: 0 PID: 28 Comm: kauditd Not tainted 4.19.130-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/0x2fe lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1c7 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:760 relay_reserve include/linux/relay.h:261 [inline] trace_note+0x5eb/0x750 kernel/trace/blktrace.c:93 trace_note_tsk kernel/trace/blktrace.c:124 [inline] __blk_add_trace+0xb86/0xe20 kernel/trace/blktrace.c:264 blk_add_trace_rq+0x36e/0x470 kernel/trace/blktrace.c:827 trace_block_rq_complete include/trace/events/block.h:116 [inline] blk_update_request+0x74c/0xaf0 block/blk-core.c:3088 scsi_end_request+0x7d/0xb60 drivers/scsi/scsi_lib.c:673 scsi_io_completion+0x279/0x17c0 drivers/scsi/scsi_lib.c:1102 scsi_softirq_done+0x336/0x3d0 drivers/scsi/scsi_lib.c:1758 __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+0x119/0x160 drivers/virtio/virtio_ring.c:950 __handle_irq_event_percpu+0x27e/0x8e0 kernel/irq/handle.c:149 handle_irq_event_percpu kernel/irq/handle.c:189 [inline] handle_irq_event+0x102/0x285 kernel/irq/handle.c:206 handle_edge_irq+0x260/0xcf0 kernel/irq/chip.c:797 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:__do_softirq+0x230/0x9a0 kernel/softirq.c:278 Code: c7 c0 58 5b d2 88 48 c1 e8 03 42 80 3c 38 00 0f 85 13 07 00 00 48 83 3d 35 59 72 01 00 0f 84 14 06 00 00 fb 66 0f 1f 44 00 00 <48> c7 44 24 08 c0 90 c0 88 b8 ff ff ff ff 0f bc 44 24 04 83 c0 01 RSP: 0018:ffff8880ae607f20 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffdc RAX: 1ffffffff11a4b6b RBX: ffff8880a954e000 RCX: 1ffff110152a9d15 RDX: 0000000000000000 RSI: ffff8880a954e888 RDI: ffff8880a954e884 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:544 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:console_unlock+0xe7b/0x1110 kernel/printk/printk.c:2437 Code: ff df 48 c1 e8 03 80 3c 08 00 0f 85 66 02 00 00 48 83 3d 4f d7 7d 07 00 0f 84 9e 00 00 00 e8 cc 23 15 00 48 8b 7c 24 30 57 9d <0f> 1f 44 00 00 e9 9b fc ff ff e8 b6 23 15 00 0f 0b e8 af 23 15 00 RSP: 0018:ffff8880a9557bd0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff8880a954e000 RBX: 0000000000000200 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff81548404 RDI: 0000000000000293 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff845c4ff0 R13: 000000000000011c R14: 0000000000000000 R15: ffffffff8945f9f0 vprintk_emit+0x2b8/0x730 kernel/printk/printk.c:1937 vprintk_func+0x79/0x17e kernel/printk/printk_safe.c:398 printk+0xba/0xed kernel/printk/printk.c:2012 kauditd_printk_skb kernel/audit.c:546 [inline] kauditd_hold_skb.cold+0x41/0x50 kernel/audit.c:579 kauditd_send_queue+0x12f/0x170 kernel/audit.c:742 kauditd_thread+0x5c0/0x7a0 kernel/audit.c:868 kthread+0x30b/0x410 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Allocated by task 32647: kmem_cache_alloc+0x122/0x370 mm/slab.c:3559 __d_alloc+0x2b/0xa10 fs/dcache.c:1610 d_alloc+0x4a/0x230 fs/dcache.c:1694 __lookup_hash+0xc8/0x180 fs/namei.c:1543 filename_create+0x186/0x490 fs/namei.c:3639 user_path_create fs/namei.c:3696 [inline] do_symlinkat+0xe1/0x2c0 fs/namei.c:4149 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9: __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+0x26c/0x9a0 kernel/softirq.c:292 The buggy address belongs to the object at ffff888083be36e0 which belongs to the cache dentry of size 288 The buggy address is located 88 bytes inside of 288-byte region [ffff888083be36e0, ffff888083be3800) The buggy address belongs to the page: page:ffffea00020ef8c0 count:1 mapcount:0 mapping:ffff88821bc44c80 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffffea00024a1f48 ffffea00020e43c8 ffff88821bc44c80 raw: 0000000000000000 ffff888083be3000 000000010000000b 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888083be3600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888083be3680: 00 00 00 00 fc fc fc fc fc fc fc fc fb fb fb fb >ffff888083be3700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888083be3780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888083be3800: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ==================================================================