================================================================== BUG: KASAN: double-free in slab_free mm/slub.c:3599 [inline] BUG: KASAN: double-free in __kmem_cache_free+0xab/0x3b0 mm/slub.c:3612 Free of addr ffff88801cbdf800 by task syz-executor.4/4507 CPU: 0 PID: 4507 Comm: syz-executor.4 Not tainted 6.0.0-rc6-next-20220923-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 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:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report_invalid_free+0x97/0x1b0 mm/kasan/report.c:460 ____kasan_slab_free+0x185/0x1c0 mm/kasan/common.c:225 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1669 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695 slab_free mm/slub.c:3599 [inline] __kmem_cache_free+0xab/0x3b0 mm/slub.c:3612 io_clean_op+0x581/0xb10 io_uring/io_uring.c:1699 io_free_batch_list+0x46f/0x7e0 io_uring/io_uring.c:1305 __io_submit_flush_completions+0x22b/0x2e0 io_uring/io_uring.c:1343 io_submit_flush_completions io_uring/io_uring.c:171 [inline] ctx_flush_and_put+0xdf/0x1b0 io_uring/io_uring.c:1003 tctx_task_work+0x153/0x4a0 io_uring/io_uring.c:1087 task_work_run+0x16b/0x270 kernel/task_work.c:179 io_run_task_work io_uring/io_uring.h:232 [inline] io_run_task_work io_uring/io_uring.h:226 [inline] io_run_task_work_ctx io_uring/io_uring.h:254 [inline] io_cqring_wait io_uring/io_uring.c:2393 [inline] __do_sys_io_uring_enter+0x9ea/0x2410 io_uring/io_uring.c:3253 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 RIP: 0033:0x7f045808b5a9 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:00007f0459206168 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f04581abf80 RCX: 00007f045808b5a9 RDX: 0000000000003a4e RSI: 0000000000001510 RDI: 0000000000000005 RBP: 00007f04580e6580 R08: 0000000020000080 R09: 0000000000000008 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd7adb864f R14: 00007f0459206300 R15: 0000000000022000 Allocated by task 4507: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:934 [inline] __kmalloc+0x54/0xc0 mm/slab_common.c:947 kmalloc include/linux/slab.h:564 [inline] io_alloc_async_data+0x9b/0x160 io_uring/io_uring.c:1590 io_msg_alloc_async io_uring/net.c:138 [inline] io_msg_alloc_async_prep io_uring/net.c:147 [inline] io_sendmsg_prep_async+0x19b/0x3c0 io_uring/net.c:221 io_req_prep_async+0x1d9/0x300 io_uring/io_uring.c:1613 io_submit_sqe io_uring/io_uring.c:2137 [inline] io_submit_sqes+0xfcd/0x1df0 io_uring/io_uring.c:2276 __do_sys_io_uring_enter+0xac6/0x2410 io_uring/io_uring.c:3216 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 4507: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511 ____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:1669 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695 slab_free mm/slub.c:3599 [inline] __kmem_cache_free+0xab/0x3b0 mm/slub.c:3612 io_send_zc_cleanup+0x133/0x180 io_uring/net.c:916 io_clean_op+0xf4/0xb10 io_uring/io_uring.c:1684 io_free_batch_list+0x46f/0x7e0 io_uring/io_uring.c:1305 __io_submit_flush_completions+0x22b/0x2e0 io_uring/io_uring.c:1343 io_submit_flush_completions io_uring/io_uring.c:171 [inline] ctx_flush_and_put+0xdf/0x1b0 io_uring/io_uring.c:1003 tctx_task_work+0x153/0x4a0 io_uring/io_uring.c:1087 task_work_run+0x16b/0x270 kernel/task_work.c:179 io_run_task_work io_uring/io_uring.h:232 [inline] io_run_task_work io_uring/io_uring.h:226 [inline] io_run_task_work_ctx io_uring/io_uring.h:254 [inline] io_cqring_wait io_uring/io_uring.c:2393 [inline] __do_sys_io_uring_enter+0x9ea/0x2410 io_uring/io_uring.c:3253 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 Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481 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:1474 expire_timers kernel/time/timer.c:1514 [inline] __run_timers.part.0+0x4a3/0xaf0 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803 __do_softirq+0x1f7/0xad8 kernel/softirq.c:571 Second to last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481 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:1474 expire_timers kernel/time/timer.c:1514 [inline] __run_timers.part.0+0x4a3/0xaf0 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803 __do_softirq+0x1f7/0xad8 kernel/softirq.c:571 The buggy address belongs to the object at ffff88801cbdf800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of 512-byte region [ffff88801cbdf800, ffff88801cbdfa00) The buggy address belongs to the physical page: page:ffffea000072f700 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffffea00008abe00 pfn:0x1cbdc head:ffffea000072f700 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888011841c80 dead000000100010 0000000000000000 raw: ffffea00008abe00 dead000000000003 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 392, tgid 392 (kworker/u4:0), ts 7210650004, free_ts 0 prep_new_page mm/page_alloc.c:2538 [inline] get_page_from_freelist+0x1092/0x2d20 mm/page_alloc.c:4287 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5546 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2280 alloc_slab_page mm/slub.c:1739 [inline] allocate_slab+0x213/0x300 mm/slub.c:1884 new_slab mm/slub.c:1937 [inline] ___slab_alloc+0xac1/0x1430 mm/slub.c:3119 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3217 slab_alloc_node mm/slub.c:3302 [inline] __kmem_cache_alloc_node+0x18a/0x3d0 mm/slub.c:3375 kmalloc_trace+0x22/0x60 mm/slab_common.c:1014 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:695 [inline] alloc_bprm+0x51/0x900 fs/exec.c:1510 kernel_execve+0xab/0x500 fs/exec.c:1969 call_usermodehelper_exec_async+0x2e3/0x580 kernel/umh.c:113 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 page_owner free stack trace missing Memory state around the buggy address: ffff88801cbdf700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801cbdf780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801cbdf800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801cbdf880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801cbdf900: fb 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