kobject: kobject_add_internal failed for netdevsim1 (error: -12 parent: devices) ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: lib/refcount.c:25 at refcount_warn_saturate+0x111/0x130 lib/refcount.c:25, CPU#1: syz-executor115/6024 Modules linked in: CPU: 1 UID: 0 PID: 6024 Comm: syz-executor115 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:refcount_warn_saturate+0x111/0x130 lib/refcount.c:25 Code: cc e8 d3 91 ec fc 48 8d 3d bc c2 0e 0c 67 48 0f b9 3a e8 c2 91 ec fc 5b 5d e9 9b 52 a0 06 e8 b6 91 ec fc 48 8d 3d af c2 0e 0c <67> 48 0f b9 3a e8 a5 91 ec fc 5b 5d e9 7e 52 a0 06 48 89 df e8 56 RSP: 0018:ffffc90003857b80 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffffff9ba33900 RCX: ffffffff851de11b RDX: ffff888033d14a80 RSI: ffffffff851de1ca RDI: ffffffff912ca480 RBP: 0000000000000002 R08: 0000000000000005 R09: 0000000000000004 R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000005 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000001 FS: 000055555bbf3400(0000) GS:ffff8880d5ee9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ec5148bda8 CR3: 000000005556e000 CR4: 0000000000352ef0 Call Trace: __refcount_add include/linux/refcount.h:289 [inline] __refcount_inc include/linux/refcount.h:366 [inline] refcount_inc include/linux/refcount.h:383 [inline] new_device_store+0x682/0x700 drivers/net/netdevsim/bus.c:197 bus_attr_store+0x74/0xb0 drivers/base/bus.c:172 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6ac/0x1050 fs/read_write.c:687 ksys_pwrite64 fs/read_write.c:794 [inline] __do_sys_pwrite64 fs/read_write.c:802 [inline] __se_sys_pwrite64 fs/read_write.c:799 [inline] __x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:799 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1cc06cd237 Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffdcb4b35c0 EFLAGS: 00000202 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 000055555bbf3400 RCX: 00007f1cc06cd237 RDX: 0000000000000005 RSI: 00007f1cc07060cd RDI: 0000000000000004 RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 R13: 00007ffdcb4b3610 R14: 0000000000000007 R15: 00007f1cc07064c2 ---------------- Code disassembly (best guess): 0: cc int3 1: e8 d3 91 ec fc call 0xfcec91d9 6: 48 8d 3d bc c2 0e 0c lea 0xc0ec2bc(%rip),%rdi # 0xc0ec2c9 d: 67 48 0f b9 3a ud1 (%edx),%rdi 12: e8 c2 91 ec fc call 0xfcec91d9 17: 5b pop %rbx 18: 5d pop %rbp 19: e9 9b 52 a0 06 jmp 0x6a052b9 1e: e8 b6 91 ec fc call 0xfcec91d9 23: 48 8d 3d af c2 0e 0c lea 0xc0ec2af(%rip),%rdi # 0xc0ec2d9 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e8 a5 91 ec fc call 0xfcec91d9 34: 5b pop %rbx 35: 5d pop %rbp 36: e9 7e 52 a0 06 jmp 0x6a052b9 3b: 48 89 df mov %rbx,%rdi 3e: e8 .byte 0xe8 3f: 56 push %rsi