================================================================== BUG: KASAN: use-after-free in d_inode include/linux/dcache.h:515 [inline] BUG: KASAN: use-after-free in relay_switch_subbuf+0x837/0x900 kernel/relay.c:676 Read of size 8 at addr ffff88804870ada0 by task kworker/1:1H/51 CPU: 1 PID: 51 Comm: kworker/1:1H Not tainted 6.0.0-rc6-syzkaller-00030-g06f7db949993 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2022 Workqueue: kblockd blk_mq_run_work_fn Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 d_inode include/linux/dcache.h:515 [inline] relay_switch_subbuf+0x837/0x900 kernel/relay.c:676 relay_reserve include/linux/relay.h:248 [inline] trace_note+0x5af/0x720 kernel/trace/blktrace.c:95 trace_note_tsk kernel/trace/blktrace.c:126 [inline] __blk_add_trace+0xbf8/0xde0 kernel/trace/blktrace.c:268 blk_add_trace_rq+0x384/0x480 kernel/trace/blktrace.c:846 trace_block_rq_issue include/trace/events/block.h:227 [inline] blk_mq_start_request+0x40d/0x7f0 block/blk-mq.c:1141 loop_queue_rq+0x83/0x11f0 drivers/block/loop.c:1809 blk_mq_dispatch_rq_list+0x70c/0x23d0 block/blk-mq.c:1902 __blk_mq_sched_dispatch_requests+0x324/0x3e0 block/blk-mq-sched.c:319 blk_mq_sched_dispatch_requests+0x106/0x190 block/blk-mq-sched.c:339 __blk_mq_run_hw_queue+0xff/0x350 block/blk-mq.c:2020 blk_mq_run_work_fn+0x55/0x70 block/blk-mq.c:2319 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Allocated by task 2971: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:470 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc_node mm/slub.c:3243 [inline] slab_alloc mm/slub.c:3251 [inline] __kmem_cache_alloc_lru mm/slub.c:3258 [inline] kmem_cache_alloc_lru+0x376/0x720 mm/slub.c:3275 __d_alloc+0x32/0x960 fs/dcache.c:1769 d_alloc+0x4a/0x230 fs/dcache.c:1849 d_alloc_parallel+0xe4/0x1400 fs/dcache.c:2647 lookup_open.isra.0+0x928/0x12a0 fs/namei.c:3338 open_last_lookups fs/namei.c:3481 [inline] path_openat+0x996/0x28f0 fs/namei.c:3688 do_filp_open+0x1b6/0x400 fs/namei.c:3718 do_sys_openat2+0x16d/0x4c0 fs/open.c:1313 do_sys_open fs/open.c:1329 [inline] __do_sys_openat fs/open.c:1345 [inline] __se_sys_openat fs/open.c:1340 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1340 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 15: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:367 [inline] ____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1754 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780 slab_free mm/slub.c:3534 [inline] kmem_cache_free+0xeb/0x5b0 mm/slub.c:3551 rcu_do_batch kernel/rcu/tree.c:2245 [inline] rcu_core+0x7b5/0x1890 kernel/rcu/tree.c:2505 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571 Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 call_rcu+0x99/0x790 kernel/rcu/tree.c:2793 dentry_free+0xc3/0x160 fs/dcache.c:377 __dentry_kill+0x4cb/0x640 fs/dcache.c:621 dentry_kill fs/dcache.c:745 [inline] dput+0x64d/0xdb0 fs/dcache.c:913 do_unlinkat+0x3dc/0x650 fs/namei.c:4300 __do_sys_unlink fs/namei.c:4345 [inline] __se_sys_unlink fs/namei.c:4343 [inline] __x64_sys_unlink+0xc6/0x110 fs/namei.c:4343 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Second to last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 call_rcu+0x99/0x790 kernel/rcu/tree.c:2793 dentry_free+0xc3/0x160 fs/dcache.c:377 __dentry_kill+0x4cb/0x640 fs/dcache.c:621 shrink_dentry_list+0x23c/0x800 fs/dcache.c:1201 shrink_dcache_parent+0x1fe/0x3c0 fs/dcache.c:1628 vfs_rmdir.part.0+0x272/0x5a0 fs/namei.c:4102 vfs_rmdir fs/namei.c:4083 [inline] do_rmdir+0x3a6/0x430 fs/namei.c:4159 __do_sys_unlinkat fs/namei.c:4339 [inline] __se_sys_unlinkat fs/namei.c:4333 [inline] __x64_sys_unlinkat+0xeb/0x130 fs/namei.c:4333 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88804870ad38 which belongs to the cache dentry of size 312 The buggy address is located 104 bytes inside of 312-byte region [ffff88804870ad38, ffff88804870ae70) The buggy address belongs to the physical page: page:ffffea000121c280 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4870a head:ffffea000121c280 order:1 compound_mapcount:0 compound_pincount:0 memcg:ffff888026110501 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001104800 dead000000000003 ffff888140007640 raw: 0000000000000000 0000000000150015 00000001ffffffff ffff888026110501 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Reclaimable, gfp_mask 0x1d20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 5890, tgid 5890 (syz-executor.5), ts 292252910320, free_ts 135208236235 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5515 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:1824 [inline] allocate_slab+0x27e/0x3d0 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x7f1/0xe10 mm/slub.c:3031 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118 slab_alloc_node mm/slub.c:3209 [inline] slab_alloc mm/slub.c:3251 [inline] __kmem_cache_alloc_lru mm/slub.c:3258 [inline] kmem_cache_alloc_lru+0x528/0x720 mm/slub.c:3275 __d_alloc+0x32/0x960 fs/dcache.c:1769 d_alloc+0x4a/0x230 fs/dcache.c:1849 d_alloc_parallel+0xe4/0x1400 fs/dcache.c:2647 lookup_open.isra.0+0x928/0x12a0 fs/namei.c:3338 open_last_lookups fs/namei.c:3481 [inline] path_openat+0x996/0x28f0 fs/namei.c:3688 do_filp_open+0x1b6/0x400 fs/namei.c:3718 do_sys_openat2+0x16d/0x4c0 fs/open.c:1313 do_sys_open fs/open.c:1329 [inline] __do_sys_openat fs/open.c:1345 [inline] __se_sys_openat fs/open.c:1340 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1340 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc_node mm/slub.c:3243 [inline] kmem_cache_alloc_node+0x2b1/0x3f0 mm/slub.c:3293 __alloc_skb+0x210/0x2f0 net/core/skbuff.c:422 alloc_skb include/linux/skbuff.h:1257 [inline] __ip6_append_data.isra.0+0x31e8/0x4480 net/ipv6/ip6_output.c:1682 ip6_append_data+0x1ea/0x550 net/ipv6/ip6_output.c:1852 rawv6_sendmsg+0x151c/0x3b00 net/ipv6/raw.c:915 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x334/0x810 net/socket.c:2482 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2536 __sys_sendmmsg+0x18b/0x460 net/socket.c:2622 __do_sys_sendmmsg net/socket.c:2651 [inline] __se_sys_sendmmsg net/socket.c:2648 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2648 Memory state around the buggy address: ffff88804870ac80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc ffff88804870ad00: fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb >ffff88804870ad80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804870ae00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ffff88804870ae80: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00 ==================================================================