WARNING: kobject bug in bind_rdev_to_array

Status: upstream: reported C repro on 2026/08/17 20:56
Reported-by: syzbot+806834e01a827c622207@syzkaller.appspotmail.com
First crash: 43d, last: 10h46m
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 WARNING: kobject bug in bind_rdev_to_array -1 12 7d07h 62d 0/2 upstream: reported on 2026/07/29 11:17
upstream WARNING: kobject bug in bind_rdev_to_array prio:normal raid -1 9 2d15h 10d 0/29 upstream: reported on 2026/09/20 01:10

Sample crash report:
------------[ cut here ]------------
kobject: '(null)' (000000009a8b32d8): is not initialized, yet kobject_get() is being called.
WARNING: CPU: 1 PID: 5533 at lib/kobject.c:634 kobject_get lib/kobject.c:632 [inline]
WARNING: CPU: 1 PID: 5533 at lib/kobject.c:634 kobject_add_internal+0xe8/0xb18 lib/kobject.c:216
Modules linked in:
CPU: 1 PID: 5533 Comm: syz.0.449 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : kobject_get lib/kobject.c:632 [inline]
pc : kobject_add_internal+0xe8/0xb18 lib/kobject.c:216
lr : kobject_get lib/kobject.c:632 [inline]
lr : kobject_add_internal+0xe8/0xb18 lib/kobject.c:216
sp : ffff800023427610
x29: ffff800023427620 x28: 1fffe0001865cc06 x27: ffff0000c9b54018
x26: 1fffe0001865cc12 x25: ffff0000c32e6090 x24: dfff800000000000
x23: dfff800000000000 x22: ffff700004684edc x21: 0000000000000000
x20: ffff0000c9b54060 x19: ffff0000c32e6078 x18: 1fffe00033e7217e
x17: ffff80001539d000 x16: ffff8000082dd25c x15: 0000000040000000
x14: 0000000000000001 x13: 1fffe00033e74870 x12: 0000000000000000
x11: ff0080000a977920 x10: 0000000000000003 x9 : ab0b8d217c00cc00
x8 : ab0b8d217c00cc00 x7 : ffff80000825ab48 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000006 x1 : ffff800011cfdc80 x0 : ffff80018a09a000
Call trace:
 kobject_get lib/kobject.c:632 [inline]
 kobject_add_internal+0xe8/0xb18 lib/kobject.c:216
 kobject_add_varg lib/kobject.c:366 [inline]
 kobject_add+0x144/0x20c lib/kobject.c:418
 bind_rdev_to_array+0x858/0xddc drivers/md/md.c:2486
 md_add_new_disk+0xab8/0x1484 drivers/md/md.c:6990
 md_ioctl+0x2158/0x25cc drivers/md/md.c:7799
 blkdev_ioctl+0x654/0xb74 block/ioctl.c:626
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 204
hardirqs last  enabled at (203): [<ffff80000825abdc>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline]
hardirqs last  enabled at (203): [<ffff80000825abdc>] finish_lock_switch+0xb0/0x1c8 kernel/sched/core.c:5005
hardirqs last disabled at (204): [<ffff800011b9d0cc>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (140): [<ffff800008031254>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (138): [<ffff800008031220>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---

Crashes (33):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/05 18:40 linux-6.1.y cf82dcca9634 4f7b22a0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: kobject bug in bind_rdev_to_array
2026/09/29 14:27 linux-6.1.y 1a8763b93150 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/29 07:39 linux-6.1.y 1a8763b93150 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/27 20:44 linux-6.1.y 1a8763b93150 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/27 04:51 linux-6.1.y 1a8763b93150 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/26 13:58 linux-6.1.y 1a8763b93150 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/26 12:31 linux-6.1.y 1a8763b93150 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/26 08:36 linux-6.1.y 1a8763b93150 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/23 14:48 linux-6.1.y 1a8763b93150 abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/22 11:25 linux-6.1.y 1a8763b93150 e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/19 15:14 linux-6.1.y 1a8763b93150 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/19 15:14 linux-6.1.y 1a8763b93150 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/18 12:50 linux-6.1.y 1a8763b93150 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/16 00:03 linux-6.1.y 1a8763b93150 2daa4bb5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/16 00:03 linux-6.1.y 1a8763b93150 2daa4bb5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/14 06:03 linux-6.1.y cf82dcca9634 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/12 21:54 linux-6.1.y cf82dcca9634 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/12 19:33 linux-6.1.y cf82dcca9634 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/08 14:49 linux-6.1.y cf82dcca9634 680aa3e1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/06 21:50 linux-6.1.y cf82dcca9634 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/06 13:23 linux-6.1.y cf82dcca9634 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/04 03:02 linux-6.1.y cf82dcca9634 801f0966 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/03 10:55 linux-6.1.y cf82dcca9634 6a988719 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/03 08:35 linux-6.1.y cf82dcca9634 6a988719 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/08/29 03:53 linux-6.1.y d64a499eea6b 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/08/29 03:52 linux-6.1.y d64a499eea6b 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/08/25 06:21 linux-6.1.y 05208478041c 614e416a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/08/21 13:02 linux-6.1.y 7e6e67054721 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/08/21 12:09 linux-6.1.y 7e6e67054721 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/08/21 02:25 linux-6.1.y 7e6e67054721 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/08/17 20:56 linux-6.1.y e4f7d8be268e 905244d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING: kobject bug in bind_rdev_to_array
2026/09/12 05:55 linux-6.1.y cf82dcca9634 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: kobject bug in bind_rdev_to_array
2026/09/05 17:35 linux-6.1.y cf82dcca9634 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING: kobject bug in bind_rdev_to_array
* Struck through repros no longer work on HEAD.