Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10a/0x149 lib/fault-inject.c:149 ================================================================== should_fail_futex kernel/futex.c:309 [inline] get_futex_key+0x82a/0x11b0 kernel/futex.c:573 BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 lib/list_debug.c:26 Read of size 8 at addr ffff8880b342bd18 by task syz-executor258/8030 futex_wait_setup+0xb3/0x260 kernel/futex.c:2787 futex_wait+0x199/0x5a0 kernel/futex.c:2850 do_futex+0x1d8/0x1570 kernel/futex.c:3906 SYSC_futex kernel/futex.c:3966 [inline] SyS_futex+0x1da/0x290 kernel/futex.c:3934 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f7e9efbfe69 RSP: 002b:00007f7e9ef502f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f7e9f0494d8 RCX: 00007f7e9efbfe69 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7e9f0494d8 RBP: 00007f7e9f0494d0 R08: 0000000000000032 R09: 0000000000000032 R10: 0000000000000000 R11: 0000000000000246 R12: 006d635f616d6472 R13: 00007f7e9ef50300 R14: 0000000000000001 R15: 0000000000022000 CPU: 1 PID: 8030 Comm: syz-executor258 Not tainted 4.14.290-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 __list_add_valid+0x93/0xa0 lib/list_debug.c:26 __list_add include/linux/list.h:60 [inline] list_add_tail include/linux/list.h:93 [inline] cma_listen_on_all drivers/infiniband/core/cma.c:2327 [inline] rdma_listen+0x656/0x9b0 drivers/infiniband/core/cma.c:3339 ucma_listen+0x10b/0x170 drivers/infiniband/core/ucma.c:1078 ucma_write+0x206/0x2c0 drivers/infiniband/core/ucma.c:1672 __vfs_write+0xe4/0x630 fs/read_write.c:480 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f7e9efbfe69 RSP: 002b:00007f7e9ef502f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f7e9f0494d8 RCX: 00007f7e9efbfe69 RDX: 0000000000000010 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 00007f7e9f0494d0 R08: 0000000000000001 R09: 0000000000000032 R10: 0000000000000000 R11: 0000000000000246 R12: 006d635f616d6472 R13: 00007f7e9ef50300 R14: 0000000000000001 R15: 0000000000022000 Allocated by task 7972: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] rdma_create_id+0x57/0x4c0 drivers/infiniband/core/cma.c:790 ucma_create_id+0x18b/0x500 drivers/infiniband/core/ucma.c:484 ucma_write+0x206/0x2c0 drivers/infiniband/core/ucma.c:1672 __vfs_write+0xe4/0x630 fs/read_write.c:480 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 7982: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 ucma_close+0x11a/0x340 drivers/infiniband/core/ucma.c:1753 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xa44/0x2850 kernel/exit.c:868 do_group_exit+0x100/0x2e0 kernel/exit.c:965 get_signal+0x38d/0x1ca0 kernel/signal.c:2412 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff8880b342bb40 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 472 bytes inside of 1024-byte region [ffff8880b342bb40, ffff8880b342bf40) The buggy address belongs to the page: page:ffffea0002cd0a80 count:1 mapcount:0 mapping:ffff8880b342a040 index:0xffff8880b342b240 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff8880b342a040 ffff8880b342b240 0000000100000005 raw: ffffea0002ce3a20 ffffea0002cb1f20 ffff88813fe74ac0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880b342bc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880b342bc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880b342bd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880b342bd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880b342be00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================