block nbd2: Send disconnect failed -32 block nbd2: Send disconnect failed -32 block nbd2: Send disconnect failed -32 FAT-fs (loop4): Can't find a valid FAT filesystem ================================================================== BUG: KASAN: use-after-free in __list_add_valid+0x9a/0xa0 lib/list_debug.c:26 Read of size 8 at addr ffff88809500a660 by task syz-executor.2/19141 CPU: 0 PID: 19141 Comm: syz-executor.2 Not tainted 4.19.100-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+0x197/0x210 lib/dump_stack.c:118 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __list_add_valid+0x9a/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:2380 [inline] rdma_listen+0x63b/0x8e0 drivers/infiniband/core/cma.c:3408 ucma_listen+0x14d/0x1c0 drivers/infiniband/core/ucma.c:1100 ucma_write+0x2d7/0x3c0 drivers/infiniband/core/ucma.c:1689 __vfs_write+0x114/0x810 fs/read_write.c:485 vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b349 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f442e105c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f442e1066d4 RCX: 000000000045b349 RDX: 0000000000000010 RSI: 00000000200001c0 RDI: 0000000000000011 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000c84 R14: 00000000004cd5d6 R15: 000000000075bf2c Allocated by task 13939: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15d/0x750 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] sk_prot_alloc+0x19c/0x2e0 net/core/sock.c:1466 sk_alloc+0x39/0xf70 net/core/sock.c:1520 pfkey_create+0x25a/0xa20 net/key/af_key.c:158 __sock_create+0x3d8/0x730 net/socket.c:1276 sock_create net/socket.c:1316 [inline] __sys_socket+0x103/0x220 net/socket.c:1346 __do_sys_socket net/socket.c:1355 [inline] __se_sys_socket net/socket.c:1353 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1353 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 13936: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3503 [inline] kfree+0xcf/0x220 mm/slab.c:3822 sk_prot_free net/core/sock.c:1503 [inline] __sk_destruct+0x580/0x780 net/core/sock.c:1583 sk_destruct+0xc8/0x100 net/core/sock.c:1598 __sk_free+0xce/0x300 net/core/sock.c:1609 sk_free+0x45/0x50 net/core/sock.c:1620 sock_put include/net/sock.h:1707 [inline] pfkey_release+0x2bf/0x340 net/key/af_key.c:194 __sock_release+0xce/0x2a0 net/socket.c:579 sock_close+0x1b/0x30 net/socket.c:1140 __fput+0x2dd/0x8b0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x145/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xc1f/0x30d0 kernel/exit.c:880 do_group_exit+0x135/0x370 kernel/exit.c:983 get_signal+0x3ec/0x1fc0 kernel/signal.c:2583 do_signal+0x95/0x1960 arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88809500a480 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 480 bytes inside of 2048-byte region [ffff88809500a480, ffff88809500ac80) The buggy address belongs to the page: page:ffffea0002540280 count:1 mapcount:0 mapping:ffff88812c31cc40 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffffea000283a088 ffffea000134f208 ffff88812c31cc40 raw: 0000000000000000 ffff88809500a480 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809500a500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809500a580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809500a600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809500a680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809500a700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== FAT-fs (loop4): bogus number of reserved sectors FAT-fs (loop4): This doesn't look like a DOS 1.x volume; DOS 2.x BPB is non-zero FAT-fs (loop4): Can't find a valid FAT filesystem (syz-executor.1,19261,0):ocfs2_parse_options:1499 ERROR: Unrecognized mount option "/dev/sequencer" or missing value (syz-executor.1,19261,0):ocfs2_fill_super:1225 ERROR: status = -22 (syz-executor.1,19354,0):ocfs2_parse_options:1499 ERROR: Unrecognized mount option "/dev/sequencer" or missing value audit: type=1400 audit(1580476135.839:204): avc: denied { map } for pid=19260 comm="syz-executor.1" path="/root/syzkaller-testdir317616474/syzkaller.AZJ9oT/782/file0" dev="cgroup" ino=140 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:cgroup_t:s0 tclass=dir permissive=1