================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:72 [inline] BUG: KASAN: use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] BUG: KASAN: use-after-free in refcount_read include/linux/refcount.h:147 [inline] BUG: KASAN: use-after-free in __refcount_add_not_zero include/linux/refcount.h:152 [inline] BUG: KASAN: use-after-free in __refcount_inc_not_zero include/linux/refcount.h:227 [inline] BUG: KASAN: use-after-free in refcount_inc_not_zero include/linux/refcount.h:245 [inline] BUG: KASAN: use-after-free in io_worker_get io_uring/io-wq.c:153 [inline] BUG: KASAN: use-after-free in io_wq_for_each_worker io_uring/io-wq.c:846 [inline] BUG: KASAN: use-after-free in io_wq_exit_workers io_uring/io-wq.c:1250 [inline] BUG: KASAN: use-after-free in io_wq_put_and_exit+0x584/0xe30 io_uring/io-wq.c:1289 Read of size 4 at addr ffff88801c9b3400 by task syz-executor.3/17543 CPU: 1 PID: 17543 Comm: syz-executor.3 Not tainted 6.2.0-rc3-syzkaller-00165-gd9fc1511728c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:306 [inline] print_report+0x15e/0x45d mm/kasan/report.c:417 kasan_report+0xbf/0x1f0 mm/kasan/report.c:517 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x141/0x190 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:72 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] refcount_read include/linux/refcount.h:147 [inline] __refcount_add_not_zero include/linux/refcount.h:152 [inline] __refcount_inc_not_zero include/linux/refcount.h:227 [inline] refcount_inc_not_zero include/linux/refcount.h:245 [inline] io_worker_get io_uring/io-wq.c:153 [inline] io_wq_for_each_worker io_uring/io-wq.c:846 [inline] io_wq_exit_workers io_uring/io-wq.c:1250 [inline] io_wq_put_and_exit+0x584/0xe30 io_uring/io-wq.c:1289 io_uring_clean_tctx+0x117/0x178 io_uring/tctx.c:193 io_uring_cancel_generic+0x5ae/0x606 io_uring/io_uring.c:3145 io_uring_files_cancel include/linux/io_uring.h:55 [inline] do_exit+0x522/0x2950 kernel/exit.c:822 do_group_exit+0xd4/0x2a0 kernel/exit.c:1012 get_signal+0x21c3/0x2450 kernel/signal.c:2859 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 __do_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7f82549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7f5c5cc EFLAGS: 00000296 ORIG_RAX: 00000000000001aa RAX: 0000000000000800 RBX: 0000000000000006 RCX: 0000000000005ed2 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000020000180 RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 17543: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380 kmalloc_node include/linux/slab.h:606 [inline] kzalloc_node include/linux/slab.h:731 [inline] create_io_worker+0x10c/0x630 io_uring/io-wq.c:801 io_wqe_create_worker io_uring/io-wq.c:310 [inline] io_wqe_enqueue+0x6c3/0xbc0 io_uring/io-wq.c:936 io_queue_iowq+0x282/0x5c0 io_uring/io_uring.c:475 io_queue_sqe_fallback+0xf3/0x190 io_uring/io_uring.c:2059 io_submit_sqe io_uring/io_uring.c:2281 [inline] io_submit_sqes+0x11db/0x1e60 io_uring/io_uring.c:2397 __do_sys_io_uring_enter+0xc1d/0x2540 io_uring/io_uring.c:3345 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Freed by task 17543: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0xaf/0x3b0 mm/slub.c:3800 io_wq_cancel_tw_create io_uring/io-wq.c:1233 [inline] io_wq_exit_workers io_uring/io-wq.c:1244 [inline] io_wq_put_and_exit+0x120/0xe30 io_uring/io-wq.c:1289 io_uring_clean_tctx+0x117/0x178 io_uring/tctx.c:193 io_uring_cancel_generic+0x5ae/0x606 io_uring/io_uring.c:3145 io_uring_files_cancel include/linux/io_uring.h:55 [inline] do_exit+0x522/0x2950 kernel/exit.c:822 do_group_exit+0xd4/0x2a0 kernel/exit.c:1012 get_signal+0x21c3/0x2450 kernel/signal.c:2859 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 __do_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488 task_work_add+0x7f/0x2c0 kernel/task_work.c:48 io_queue_worker_create+0x41d/0x660 io_uring/io-wq.c:373 io_wqe_dec_running+0x1e4/0x240 io_uring/io-wq.c:410 io_wq_worker_sleeping+0xa6/0xc0 io_uring/io-wq.c:698 sched_submit_work kernel/sched/core.c:6648 [inline] schedule+0x16e/0x1b0 kernel/sched/core.c:6679 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6741 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747 io_ring_submit_lock io_uring/io_uring.h:215 [inline] io_buffer_select+0x8e5/0xbe0 io_uring/kbuf.c:178 io_recv+0x851/0x1140 io_uring/net.c:860 io_issue_sqe+0x156/0x1220 io_uring/io_uring.c:1856 io_wq_submit_work+0x29c/0xdc0 io_uring/io_uring.c:1932 io_worker_handle_work+0xc41/0x1c60 io_uring/io-wq.c:587 io_wqe_worker+0xa5b/0xe40 io_uring/io-wq.c:632 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Second to last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488 insert_work+0x48/0x350 kernel/workqueue.c:1358 __queue_work+0x693/0x13b0 kernel/workqueue.c:1517 call_timer_fn+0x1da/0x7c0 kernel/time/timer.c:1700 expire_timers+0xbb/0x5c0 kernel/time/timer.c:1746 __run_timers kernel/time/timer.c:2022 [inline] __run_timers kernel/time/timer.c:1995 [inline] run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035 __do_softirq+0x1fb/0xadc kernel/softirq.c:571 The buggy address belongs to the object at ffff88801c9b3400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of 512-byte region [ffff88801c9b3400, ffff88801c9b3600) The buggy address belongs to the physical page: page:ffffea0000726c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1c9b0 head:ffffea0000726c00 order:2 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012441c80 ffffea0000605600 dead000000000002 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5168, tgid 5168 (kworker/0:6), ts 129286673117, free_ts 128247100397 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x119c/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5549 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2286 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x350 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x1a4/0x430 mm/slub.c:3491 kmalloc_trace+0x26/0x60 mm/slab_common.c:1062 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] fib6_info_alloc+0xc9/0x220 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x341/0x18f0 net/ipv6/route.c:3749 addrconf_f6i_alloc+0x381/0x620 net/ipv6/route.c:4571 ipv6_add_addr+0x395/0x1de0 net/ipv6/addrconf.c:1105 addrconf_add_linklocal+0x1cc/0x590 net/ipv6/addrconf.c:3215 addrconf_addr_gen+0x326/0x370 net/ipv6/addrconf.c:3346 addrconf_dev_config+0x255/0x410 net/ipv6/addrconf.c:3391 addrconf_notify+0xfb6/0x1c80 net/ipv6/addrconf.c:3635 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3464 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x66/0x90 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slub.c:3452 [inline] __kmem_cache_alloc_node+0x1ea/0x430 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc+0x4a/0xd0 mm/slab_common.c:981 kmalloc include/linux/slab.h:584 [inline] kzalloc include/linux/slab.h:720 [inline] fib_create_info+0xdbf/0x4b50 net/ipv4/fib_semantics.c:1452 fib_table_insert+0x199/0x1be0 net/ipv4/fib_trie.c:1236 fib_magic+0x455/0x540 net/ipv4/fib_frontend.c:1101 fib_add_ifaddr+0x16f/0x540 net/ipv4/fib_frontend.c:1123 fib_inetaddr_event+0x166/0x2a0 net/ipv4/fib_frontend.c:1437 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 blocking_notifier_call_chain kernel/notifier.c:382 [inline] blocking_notifier_call_chain+0x6b/0xa0 kernel/notifier.c:370 __inet_insert_ifa+0x919/0xbd0 net/ipv4/devinet.c:555 Memory state around the buggy address: ffff88801c9b3300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801c9b3380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801c9b3400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801c9b3480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801c9b3500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 03 74 c0 01 add 0x1(%rax,%rax,8),%esi 4: 10 05 03 74 b8 01 adc %al,0x1b87403(%rip) # 0x1b8740d a: 10 06 adc %al,(%rsi) c: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 10: 10 07 adc %al,(%rdi) 12: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi 16: 10 08 adc %cl,(%rax) 18: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1c: 00 00 add %al,(%rax) 1e: 00 00 add %al,(%rax) 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 * 2a: 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 retq 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 39: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi