syzbot


WARNING: ODEBUG bug in __sk_destruct (3)

Status: upstream: reported C repro on 2025/08/08 11:24
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+d199b52665b6c3069b94@syzkaller.appspotmail.com
Fix commit: 52565a935213 net: kcm: Fix race condition in kcm_unattach()
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-snapshot-upstream-root ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce], missing on: [ci-qemu-native-arm64-kvm ci-qemu2-riscv64 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-kasan-gce-smack-root ci2-upstream-usb]
First crash: 54d, last: 5d13h
Cause bisection: failed (error log, bisect log)
  
Discussions (3)
Title Replies (including bot) Last reply
[PATCH net v2] net: kcm: Fix race condition in kcm_unattach() 2 (2) 2025/08/14 01:30
[PATCH net-next] net: kcm: Fix race condition in kcm_unattach() 5 (6) 2025/08/12 19:27
[syzbot] [net?] WARNING: ODEBUG bug in __sk_destruct (3) 3 (7) 2025/08/09 05:11
Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING: ODEBUG bug in __sk_destruct origin:upstream -1 C 2 28d 29d 0/3 upstream: reported C repro on 2025/07/23 20:40
upstream WARNING: ODEBUG bug in __sk_destruct smc -1 C 2855 2206d 2671d 12/29 fixed on 2019/08/27 17:15
linux-6.6 WARNING: ODEBUG bug in __sk_destruct origin:upstream -1 C 3 2d02h 34d 0/2 upstream: reported C repro on 2025/07/19 04:11
linux-6.1 WARNING: ODEBUG bug in __sk_destruct origin:upstream -1 C 3 18d 19d 0/3 upstream: reported C repro on 2025/08/02 18:15
upstream WARNING: ODEBUG bug in __sk_destruct (2) can -1 C done done 62 1390d 1588d 20/29 fixed on 2021/11/10 00:50
Last patch testing requests (9)
Created Duration User Patch Repo Result
2025/08/09 07:56 1h16m hdanton@sina.com patch upstream OK log
2025/08/09 04:37 33m hdanton@sina.com patch upstream OK log
2025/08/09 02:53 24m hdanton@sina.com patch upstream report log
2025/08/08 13:56 34m hdanton@sina.com patch upstream report log
2025/08/07 15:13 23m retest repro bpf report log
2025/08/07 15:13 31m retest repro bpf report log
2025/08/07 15:13 18m retest repro bpf report log
2025/07/17 01:33 16m retest repro bpf-next report log
2025/07/17 01:33 1h58m retest repro bpf-next report log

Sample crash report:
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88807dcf7668 object type: work_struct hint: kcm_tx_work+0x0/0x180 net/kcm/kcmsock.c:-1
WARNING: CPU: 0 PID: 6293 at lib/debugobjects.c:615 debug_print_object+0x16b/0x1e0 lib/debugobjects.c:612
Modules linked in:
CPU: 0 UID: 0 PID: 6293 Comm: syz.0.87 Not tainted 6.16.0-rc6-syzkaller-g7abc678e3084 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:debug_print_object+0x16b/0x1e0 lib/debugobjects.c:612
Code: 4c 89 ff e8 e7 b7 5b fd 4d 8b 0f 48 c7 c7 a0 95 e2 8b 48 8b 34 24 4c 89 ea 89 e9 4d 89 f0 41 54 e8 da 93 bd fc 48 83 c4 08 90 <0f> 0b 90 90 ff 05 c7 85 db 0a 48 83 c4 08 5b 41 5c 41 5d 41 5e 41
RSP: 0018:ffffc900021efb30 EFLAGS: 00010296
RAX: f0e2d1323eb60c00 RBX: dffffc0000000000 RCX: ffff88802699da00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfaa6c R12: ffffffff8a9e4d50
R13: ffffffff8be29720 R14: ffff88807dcf7668 R15: ffffffff8b89dd60
FS:  00007f6914e486c0(0000) GS:ffff888125c23000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6914e47f98 CR3: 00000000288b8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
 debug_check_no_obj_freed+0x3a2/0x470 lib/debugobjects.c:1129
 slab_free_hook mm/slub.c:2312 [inline]
 slab_free mm/slub.c:4643 [inline]
 kmem_cache_free+0x113/0x400 mm/slub.c:4745
 sk_prot_free net/core/sock.c:2284 [inline]
 __sk_destruct+0x4d2/0x660 net/core/sock.c:2381
 kcm_release+0x528/0x5c0 net/kcm/kcmsock.c:1731
 __sock_release net/socket.c:647 [inline]
 sock_close+0xc0/0x240 net/socket.c:1391
 __fput+0x44c/0xa70 fs/file_table.c:465
 fput_close_sync+0x119/0x200 fs/file_table.c:570
 __do_sys_close fs/open.c:1589 [inline]
 __se_sys_close fs/open.c:1574 [inline]
 __x64_sys_close+0x7f/0x110 fs/open.c:1574
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6913f8e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6914e48038 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007f69141b6160 RCX: 00007f6913f8e9a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 00007f6914010d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f69141b6160 R15: 00007ffe8d790a18
 </TASK>

Crashes (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/22 14:31 bpf 7abc678e3084 1555463b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING: ODEBUG bug in __sk_destruct
2025/07/22 09:09 bpf 7abc678e3084 1555463b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING: ODEBUG bug in __sk_destruct
2025/07/03 01:24 bpf-next 212ec9229567 0cd59a8f .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING: ODEBUG bug in __sk_destruct
2025/07/24 06:48 bpf 7abc678e3084 0c1d6ded .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING: ODEBUG bug in __sk_destruct
2025/06/29 15:32 bpf-next c4b1be928ea0 fc9d8ee5 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING: ODEBUG bug in __sk_destruct
2025/06/29 18:00 upstream dfba48a70cb6 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING: ODEBUG bug in __sk_destruct
2025/08/16 18:33 bpf-next 3ec85602f86c 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING: ODEBUG bug in __sk_destruct
2025/08/16 15:56 bpf-next 3ec85602f86c 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING: ODEBUG bug in __sk_destruct
2025/07/21 15:36 bpf-next 42be23e8f2dc 0b3788a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING: ODEBUG bug in __sk_destruct
2025/07/03 00:00 bpf-next 212ec9229567 0cd59a8f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING: ODEBUG bug in __sk_destruct
2025/06/28 15:26 bpf-next bacdf5a0e69d fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING: ODEBUG bug in __sk_destruct
* Struck through repros no longer work on HEAD.