kobject: '(null)' (ffff88811ba4c548): is not initialized, yet kobject_put() is being called.
WARNING: CPU: 0 PID: 411 at lib/kobject.c:736 kobject_put+0x8e/0x2a0 lib/kobject.c:734
Modules linked in:
CPU: 0 UID: 0 PID: 411 Comm: syz.4.18 Not tainted syzkaller #0 1b627ac51616646c2b03e03cc27ccf1d06a70c9d
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:kobject_put+0x8e/0x2a0 lib/kobject.c:734
Code: 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 44 e1 44 fc 48 8b 33 48 c7 c7 a0 07 9b 86 48 89 da e8 22 dd 68 fb <0f> 0b eb 0f e8 e9 04 ec fb e9 9c 01 00 00 e8 df 04 ec fb 4c 8d 7b
RSP: 0018:ffffc90000faf1f8 EFLAGS: 00010246
RAX: 6099c7b82360a500 RBX: ffff88811ba4c548 RCX: ffff88810b6bcc00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc90000faf220 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0e9f34c R12: 00000000fffffff4
R13: ffff88811ba4c584 R14: 1ffff110237498b0 R15: 0000000000000000
FS:  0000555563beb500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff7d9afdb0 CR3: 000000010bad6000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 put_device+0x23/0x40 drivers/base/core.c:3800
 __scsi_remove_device+0xc4/0x3c0 drivers/scsi/scsi_sysfs.c:1501
 scsi_alloc_sdev+0x970/0xcc0 drivers/scsi/scsi_scan.c:379
 scsi_probe_and_add_lun+0x1e9/0x3e60 drivers/scsi/scsi_scan.c:1207
 __scsi_scan_target+0x1f1/0xc20 drivers/scsi/scsi_scan.c:1754
 scsi_scan_channel drivers/scsi/scsi_scan.c:1842 [inline]
 scsi_scan_host_selected+0x352/0x610 drivers/scsi/scsi_scan.c:1871
 scsi_scan drivers/scsi/scsi_sysfs.c:151 [inline]
 store_scan+0x4ba/0x550 drivers/scsi/scsi_sysfs.c:191
 dev_attr_store+0x76/0xa0 drivers/base/core.c:2440
 sysfs_kf_write+0x13e/0x160 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x316/0x510 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x75f/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f94f379e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc8c8c4c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f94f3a25fa0 RCX: 00007f94f379e0d9
RDX: 0000000000000005 RSI: 0000200000001400 RDI: 0000000000000003
RBP: 00007f94f3835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f94f3a25fac R14: 00007f94f3a25fa0 R15: 00007f94f3a25fa0
 </TASK>
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 411 at lib/refcount.c:28 refcount_warn_saturate+0x119/0x1c0 lib/refcount.c:28
Modules linked in:
CPU: 0 UID: 0 PID: 411 Comm: syz.4.18 Tainted: G        W          syzkaller #0 1b627ac51616646c2b03e03cc27ccf1d06a70c9d
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:refcount_warn_saturate+0x119/0x1c0 lib/refcount.c:28
Code: 05 01 48 c7 c7 c0 f0 51 86 e8 23 44 55 fe 0f 0b eb da e8 ea 6b d8 fe c6 05 68 49 36 05 01 48 c7 c7 20 f1 51 86 e8 07 44 55 fe <0f> 0b eb be e8 ce 6b d8 fe c6 05 49 49 36 05 01 48 c7 c7 60 f0 51
RSP: 0018:ffffc90000faf1d8 EFLAGS: 00010246
RAX: 6099c7b82360a500 RBX: 0000000000000003 RCX: ffff88810b6bcc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc90000faf1e8 R08: ffffc90000faeec7 R09: 1ffff920001f5dd8
R10: dffffc0000000000 R11: fffff520001f5dd9 R12: 0000000000000000
R13: ffff88811ba4c584 R14: ffff88811ba4c580 R15: ffff88811ba4c580
FS:  0000555563beb500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff7d9afdb0 CR3: 000000010bad6000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 __refcount_sub_and_test include/linux/refcount.h:400 [inline]
 __refcount_dec_and_test include/linux/refcount.h:432 [inline]
 refcount_dec_and_test include/linux/refcount.h:450 [inline]
 kref_put include/linux/kref.h:64 [inline]
 kobject_put+0x25a/0x2a0 lib/kobject.c:737
 put_device+0x23/0x40 drivers/base/core.c:3800
 __scsi_remove_device+0xc4/0x3c0 drivers/scsi/scsi_sysfs.c:1501
 scsi_alloc_sdev+0x970/0xcc0 drivers/scsi/scsi_scan.c:379
 scsi_probe_and_add_lun+0x1e9/0x3e60 drivers/scsi/scsi_scan.c:1207
 __scsi_scan_target+0x1f1/0xc20 drivers/scsi/scsi_scan.c:1754
 scsi_scan_channel drivers/scsi/scsi_scan.c:1842 [inline]
 scsi_scan_host_selected+0x352/0x610 drivers/scsi/scsi_scan.c:1871
 scsi_scan drivers/scsi/scsi_sysfs.c:151 [inline]
 store_scan+0x4ba/0x550 drivers/scsi/scsi_sysfs.c:191
 dev_attr_store+0x76/0xa0 drivers/base/core.c:2440
 sysfs_kf_write+0x13e/0x160 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x316/0x510 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x75f/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f94f379e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc8c8c4c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f94f3a25fa0 RCX: 00007f94f379e0d9
RDX: 0000000000000005 RSI: 0000200000001400 RDI: 0000000000000003
RBP: 00007f94f3835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f94f3a25fac R14: 00007f94f3a25fa0 R15: 00007f94f3a25fa0
 </TASK>
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
kobject: '(null)' (ffff88811ba4c1d0): is not initialized, yet kobject_put() is being called.
WARNING: CPU: 0 PID: 411 at lib/kobject.c:736 kobject_put+0x8e/0x2a0 lib/kobject.c:734
Modules linked in:
CPU: 0 UID: 0 PID: 411 Comm: syz.4.18 Tainted: G        W          syzkaller #0 1b627ac51616646c2b03e03cc27ccf1d06a70c9d
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:kobject_put+0x8e/0x2a0 lib/kobject.c:734
Code: 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 44 e1 44 fc 48 8b 33 48 c7 c7 a0 07 9b 86 48 89 da e8 22 dd 68 fb <0f> 0b eb 0f e8 e9 04 ec fb e9 9c 01 00 00 e8 df 04 ec fb 4c 8d 7b
RSP: 0018:ffffc90000faf1f8 EFLAGS: 00010246
RAX: 6099c7b82360a500 RBX: ffff88811ba4c1d0 RCX: ffff88810b6bcc00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc90000faf220 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0e9f34c R12: ffffffff86630e90
R13: ffff88811ba4c20c R14: 1ffff11023749841 R15: 0000000000000000
FS:  0000555563beb500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff7d9afdb0 CR3: 000000010bad6000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 put_device+0x23/0x40 drivers/base/core.c:3800
 __scsi_remove_device+0x32d/0x3c0 drivers/scsi/scsi_sysfs.c:1527
 scsi_alloc_sdev+0x970/0xcc0 drivers/scsi/scsi_scan.c:379
 scsi_probe_and_add_lun+0x1e9/0x3e60 drivers/scsi/scsi_scan.c:1207
 __scsi_scan_target+0x1f1/0xc20 drivers/scsi/scsi_scan.c:1754
 scsi_scan_channel drivers/scsi/scsi_scan.c:1842 [inline]
 scsi_scan_host_selected+0x352/0x610 drivers/scsi/scsi_scan.c:1871
 scsi_scan drivers/scsi/scsi_sysfs.c:151 [inline]
 store_scan+0x4ba/0x550 drivers/scsi/scsi_sysfs.c:191
 dev_attr_store+0x76/0xa0 drivers/base/core.c:2440
 sysfs_kf_write+0x13e/0x160 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x316/0x510 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x75f/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f94f379e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc8c8c4c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f94f3a25fa0 RCX: 00007f94f379e0d9
RDX: 0000000000000005 RSI: 0000200000001400 RDI: 0000000000000003
RBP: 00007f94f3835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f94f3a25fac R14: 00007f94f3a25fa0 R15: 00007f94f3a25fa0
 </TASK>
---[ end trace 0000000000000000 ]---
scsi_alloc_sdev: Allocation failure during SCSI scanning, some SCSI devices might not be configured
------------[ cut here ]------------
kernel BUG at drivers/scsi/scsi_scan.c:594!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 411 Comm: syz.4.18 Tainted: G        W          syzkaller #0 1b627ac51616646c2b03e03cc27ccf1d06a70c9d
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:scsi_target_reap+0x172/0x180 drivers/scsi/scsi_scan.c:594
Code: 81 fe e9 ef fe ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 46 ff ff ff 4c 89 ef e8 18 9b 81 fe e9 39 ff ff ff e8 fe be 28 fe <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 d7 6c e7 89 90 90 90
RSP: 0018:ffffc90000faf7a8 EFLAGS: 00010293
RAX: ffffffff835eb2c2 RBX: ffff88811a820000 RCX: ffff88810b6bcc00
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005
RBP: ffffc90000faf7d0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520001f5ee0 R12: ffff88811a820000
R13: ffff88811a8203c4 R14: 1ffff11023504078 R15: 0000000000000005
FS:  0000555563beb500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f481a470000 CR3: 000000010bad6000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 __scsi_scan_target+0x62c/0xc20 drivers/scsi/scsi_scan.c:1771
 scsi_scan_channel drivers/scsi/scsi_scan.c:1842 [inline]
 scsi_scan_host_selected+0x352/0x610 drivers/scsi/scsi_scan.c:1871
 scsi_scan drivers/scsi/scsi_sysfs.c:151 [inline]
 store_scan+0x4ba/0x550 drivers/scsi/scsi_sysfs.c:191
 dev_attr_store+0x76/0xa0 drivers/base/core.c:2440
 sysfs_kf_write+0x13e/0x160 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x316/0x510 fs/kernfs/file.c:352
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x75f/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f94f379e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc8c8c4c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f94f3a25fa0 RCX: 00007f94f379e0d9
RDX: 0000000000000005 RSI: 0000200000001400 RDI: 0000000000000003
RBP: 00007f94f3835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f94f3a25fac R14: 00007f94f3a25fa0 R15: 00007f94f3a25fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:scsi_target_reap+0x172/0x180 drivers/scsi/scsi_scan.c:594
Code: 81 fe e9 ef fe ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 46 ff ff ff 4c 89 ef e8 18 9b 81 fe e9 39 ff ff ff e8 fe be 28 fe <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 d7 6c e7 89 90 90 90
RSP: 0018:ffffc90000faf7a8 EFLAGS: 00010293
RAX: ffffffff835eb2c2 RBX: ffff88811a820000 RCX: ffff88810b6bcc00
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005
RBP: ffffc90000faf7d0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520001f5ee0 R12: ffff88811a820000
R13: ffff88811a8203c4 R14: 1ffff11023504078 R15: 0000000000000005
FS:  0000555563beb500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff7d9afdb0 CR3: 000000010bad6000 CR4: 00000000003526b0