RBP: 000000000072be80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016 R13: 00000000004d5b20 R14: 00000000004c9273 R15: 0000000000000002 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN CPU: 0 PID: 21871 Comm: syz-executor4 Not tainted 4.18.0-rc6-next-20180725+ #18 binder: undelivered TRANSACTION_ERROR: 29189 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:p9_client_prepare_req.part.8+0x392/0xa00 net/9p/client.c:652 Code: ff 0f 87 6a 02 00 00 e8 6c 8b f4 fa 0f be 85 f4 fe ff ff 4c 89 f2 48 c1 ea 03 89 85 f4 fe ff ff 48 b8 00 00 00 00 00 fc ff df <80> 3c 02 00 0f 85 89 05 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b RSP: 0018:ffff88019c2ef310 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90004e14000 RDX: 000000000000000a RSI: ffffffff86881c94 RDI: ffff8801d9ac35b8 RBP: ffff88019c2ef440 R08: ffff880194c2e000 R09: fffffbfff10057c6 R10: fffffbfff10057c6 R11: ffffffff8802be33 R12: ffff8801d9ac3580 binder: 21891:21892 BC_INCREFS_DONE u0000000000000000 node 567 cookie mismatch 0100000000000000 != 0000000000000000 R13: 0000000000002000 R14: 0000000000000050 R15: ffff8801cf526188 FS: 00007fba9d65b700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33926000 CR3: 000000019b22c000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: binder_alloc: binder_alloc_mmap_handler: 21891 20001000-20004000 already mapped failed -16 p9_client_prepare_req net/9p/client.c:682 [inline] p9_client_rpc+0x247/0x1420 net/9p/client.c:682 binder: BINDER_SET_CONTEXT_MGR already set binder_alloc: 21891: binder_alloc_buf, no vma p9_client_clunk+0x93/0x150 net/9p/client.c:1392 v9fs_dentry_release+0x68/0xd0 fs/9p/vfs_dentry.c:73 __dentry_kill+0x4c0/0x7a0 fs/dcache.c:574 binder: 21891:21895 transaction failed 29189/-3, size 24-8 line 2967 binder: 21891:21892 ioctl 40046207 0 returned -16 dentry_kill+0xc9/0x5a0 fs/dcache.c:688 dput.part.26+0x66b/0x7a0 fs/dcache.c:849 dput fs/dcache.c:832 [inline] do_one_tree+0x37/0x40 fs/dcache.c:1532 shrink_dcache_for_umount+0xc7/0x2b0 fs/dcache.c:1546 binder: 21891:21898 BC_ACQUIRE_DONE u0000000000000000 no match generic_shutdown_super+0xd5/0x530 fs/super.c:440 kill_anon_super+0x3c/0x50 fs/super.c:1151 binder: 21891:21898 BC_INCREFS_DONE u0000000000000000 no match v9fs_kill_super+0x3e/0xa0 fs/9p/vfs_super.c:230 deactivate_locked_super+0x97/0x100 fs/super.c:328 deactivate_super+0x2bb/0x320 fs/super.c:359 binder: 21891:21897 Release 1 refcount change on invalid ref 1 ret -22 cleanup_mnt+0xbf/0x160 fs/namespace.c:1067 __cleanup_mnt+0x16/0x20 fs/namespace.c:1074 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 binder: send failed reply for transaction 566 to 21891:21892 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456919 Code: fd b4 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fba9d65ac78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007fba9d65b6d4 RCX: 0000000000456919 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000140 RBP: 000000000072be80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016 R13: 00000000004d5b20 R14: 00000000004c9273 R15: 0000000000000002 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) ---[ end trace a1a18eb235e03302 ]--- RIP: 0010:p9_client_prepare_req.part.8+0x392/0xa00 net/9p/client.c:652 Code: ff 0f 87 6a 02 00 00 e8 6c 8b f4 fa 0f be 85 f4 fe ff ff 4c 89 f2 48 c1 ea 03 89 85 f4 fe ff ff 48 b8 00 00 00 00 00 fc ff df <80> 3c 02 00 0f 85 89 05 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b RSP: 0018:ffff88019c2ef310 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90004e14000 binder: undelivered TRANSACTION_ERROR: 29189 RDX: 000000000000000a RSI: ffffffff86881c94 RDI: ffff8801d9ac35b8 RBP: ffff88019c2ef440 R08: ffff880194c2e000 R09: fffffbfff10057c6 R10: fffffbfff10057c6 R11: ffffffff8802be33 R12: ffff8801d9ac3580 R13: 0000000000002000 R14: 0000000000000050 R15: ffff8801cf526188 FS: 00007fba9d65b700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33926000 CR3: 000000019b22c000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400