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WARNING in inet_sock_destruct (2)

Status: upstream: reported C repro on 2025/12/04 18:03
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+c0e2e58f45917625155b@syzkaller.appspotmail.com
First crash: 225d, last: 2h03m
Fix bisection: the issue occurs on the latest tested release (bisect log)
Crash: WARNING in inet_sock_destruct (log)
Repro: C syz .config
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/12/07 linux-5.15.y (ToT) 68efe5a6c16a C [report] WARNING in inet_sock_destruct
2025/12/07 upstream (ToT) 37bb2e7217b0 C Didn't crash
▶ ▼ Similar bugs (15)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 WARNING in inet_sock_destruct (2) origin:upstream -1 C error 10 5d16h 189d 0/2 upstream: reported C repro on 2026/01/10 00:38
android-49 WARNING in inet_sock_destruct -1 C 728 2879d 2654d 0/3 public: reported C repro on 2019/04/12 00:00
linux-6.1 WARNING in inet_sock_destruct (2) origin:lts-only -1 C inconclusive 16 312d 535d 0/3 upstream: reported C repro on 2025/01/28 09:26
android-44 WARNING in inet_sock_destruct -1 12 2887d 3099d 0/2 auto-closed as invalid on 2019/02/22 12:37
upstream WARNING in inet_sock_destruct (4) net -1 C done 6683 318d 1120d 29/29 fixed on 2025/09/04 16:57
upstream WARNING in inet_sock_destruct (3) net -1 C 87 1139d 1241d 22/29 fixed on 2023/06/08 14:41
upstream WARNING in inet_sock_destruct (5) net -1 C error 8 274d 311d 29/29 fixed on 2025/10/29 21:02
linux-6.6 WARNING in inet_sock_destruct origin:lts-only -1 C done 3 305d 305d 2/2 fixed on 2025/10/22 03:03
linux-5.15 WARNING in inet_sock_destruct -1 C error 2061 298d 1166d 0/3 auto-obsoleted due to no activity on 2025/12/01 05:33
linux-6.1 WARNING in inet_sock_destruct origin:upstream missing-backport -1 C done 631 579d 1193d 3/3 fixed on 2025/01/27 09:36
android-6-12 WARNING in inet_sock_destruct origin:upstream -1 C 58 323d 385d 0/1 auto-obsoleted due to no activity on 2025/10/18 01:19
upstream WARNING in inet_sock_destruct (2) net -1 C unreliable unreliable 1259 1437d 2068d 0/29 closed as invalid on 2022/10/12 18:26
upstream WARNING in inet_sock_destruct (6) prio:high net -1 C error 616 6m 154d 0/29 upstream: reported C repro on 2026/02/13 20:08
upstream WARNING in inet_sock_destruct net -1 5893 3181d 3176d 0/29 closed as invalid on 2018/01/30 22:53
linux-4.14 WARNING in inet_sock_destruct -1 C inconclusive 1 2237d 2297d 0/1 upstream: reported C repro on 2020/04/02 03:04
▶ ▼ Last patch testing requests (4)
Created Duration User Patch Repo Result
2026/06/27 15:25 16m retest repro linux-5.15.y report log
2026/06/05 08:01 17m retest repro linux-5.15.y report log
2026/04/17 07:42 10m retest repro linux-5.15.y report log
2026/03/23 20:11 9m retest repro linux-5.15.y report log
▶ ▼ Fix bisection attempts (5)
Created Duration User Patch Repo Result
2026/05/15 06:58 18m fix candidate upstream error job log
2026/03/26 07:01 1m fix candidate upstream error job log
2026/02/24 01:44 6m fix candidate upstream error job log
2026/01/24 15:00 1m fix candidate upstream error job log
2026/01/12 07:01 1h47m bisect fix linux-5.15.y OK (0) job log log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 144 at net/ipv4/af_inet.c:157 inet_sock_destruct+0x639/0x730 net/ipv4/af_inet.c:157
Modules linked in:
CPU: 1 PID: 144 Comm: kworker/u4:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
Workqueue: netns cleanup_net
RIP: 0010:inet_sock_destruct+0x639/0x730 net/ipv4/af_inet.c:157
Code: 01 e8 cb 5e 00 f9 0f 0b e9 64 fe ff ff e8 bf 5e 00 f9 0f 0b e9 99 fe ff ff e8 b3 5e 00 f9 0f 0b e9 c1 fe ff ff e8 a7 5e 00 f9 <0f> 0b e9 e9 fe ff ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c 5b fd ff
RSP: 0018:ffffc90000dd0b48 EFLAGS: 00010246
RAX: ffffffff887893f9 RBX: dffffc0000000000 RCX: ffff88801c048000
RDX: 0000000000000100 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000080000000 R08: ffff88802c98e57f R09: 1ffff11005931caf
R10: dffffc0000000000 R11: ffffed1005931cb0 R12: ffff88802c98e300
R13: ffff88802c98e300 R14: ffff88802c98e520 R15: 1ffff11005931c62
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f242a83cff8 CR3: 000000000c08e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __sk_destruct+0x4f/0x840 net/core/sock.c:1961
 sock_put include/net/sock.h:1990 [inline]
 sctp_endpoint_destroy_rcu+0x9d/0xe0 net/sctp/endpointola.c:193
 rcu_do_batch kernel/rcu/tree.c:2523 [inline]
 rcu_core+0x96e/0x1650 kernel/rcu/tree.c:2763
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:lock_acquire+0x208/0x400 kernel/locking/lockdep.c:5627
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3d 04 f8 0f 85 f1 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 43 c7 44 3d 08 00 00 00 00 65 48 8b 04
RSP: 0018:ffffc900010af920 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 7fae639ab9c59e00
RDX: 0000000000000000 RSI: ffffffff8a2b3e80 RDI: ffffffff8a7a2a40
RBP: ffffc900010afa40 R08: dffffc0000000000 R09: 1ffffffff203d218
R10: dffffc0000000000 R11: fffffbfff203d219 R12: ffffffff8c31ef20
R13: 1ffff92000215f30 R14: 0000000000000246 R15: dffffc0000000000
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
 rcu_read_lock include/linux/rcupdate.h:740 [inline]
 inet_twsk_purge+0x10d/0x820 net/ipv4/inet_timewait_sock.c:268
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x78e/0xba0 net/core/net_namespace.c:635
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
----------------
Code disassembly (best guess):
   0:	f7 84 24 80 00 00 00 	testl  $0x200,0x80(%rsp)
   7:	00 02 00 00
   b:	43 c6 44 3d 04 f8    	movb   $0xf8,0x4(%r13,%r15,1)
  11:	0f 85 f1 00 00 00    	jne    0x108
  17:	41 f7 c6 00 02 00 00 	test   $0x200,%r14d
  1e:	74 01                	je     0x21
  20:	fb                   	sti
  21:	48 c7 44 24 60 0e 36 	movq   $0x45e0360e,0x60(%rsp)
  28:	e0 45
* 2a:	4b c7 44 3d 00 00 00 	movq   $0x0,0x0(%r13,%r15,1) <-- trapping instruction
  31:	00 00
  33:	43 c7 44 3d 08 00 00 	movl   $0x0,0x8(%r13,%r15,1)
  3a:	00 00
  3c:	65                   	gs
  3d:	48                   	rex.W
  3e:	8b                   	.byte 0x8b
  3f:	04                   	.byte 0x4

Crashes (49):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/17 13:57 linux-5.15.y c86c4726e7f0 7f27c57a .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/03/30 04:55 linux-5.15.y 91d48252ad4b b5ceaad2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2025/12/04 20:06 linux-5.15.y cc5ec8769306 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/07/17 23:27 linux-5.15.y c86c4726e7f0 8aaff637 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/07/17 12:44 linux-5.15.y c86c4726e7f0 7f27c57a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/07/05 15:28 linux-5.15.y c86c4726e7f0 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/07/03 10:29 linux-5.15.y eceeec79dbc6 58bf2096 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/07/02 21:15 linux-5.15.y eceeec79dbc6 2b70b115 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/07/02 21:07 linux-5.15.y eceeec79dbc6 2b70b115 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/07/02 21:07 linux-5.15.y eceeec79dbc6 2b70b115 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/05/18 04:13 linux-5.15.y 93741761e5e3 de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/05/18 04:13 linux-5.15.y 93741761e5e3 de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/05/17 06:30 linux-5.15.y 93741761e5e3 de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/05/16 14:05 linux-5.15.y 93741761e5e3 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/05/16 14:05 linux-5.15.y 93741761e5e3 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/04/30 10:22 linux-5.15.y b9d57c40a767 005438fc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/04/30 10:21 linux-5.15.y b9d57c40a767 005438fc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/04/26 06:52 linux-5.15.y b9d57c40a767 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/04/23 06:23 linux-5.15.y b9d57c40a767 b10da5ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/04/23 06:23 linux-5.15.y b9d57c40a767 b10da5ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/04/22 15:57 linux-5.15.y b9d57c40a767 4595e353 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/04/22 15:57 linux-5.15.y b9d57c40a767 4595e353 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/04/22 03:36 linux-5.15.y b9d57c40a767 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/04/22 03:35 linux-5.15.y b9d57c40a767 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/04/21 10:20 linux-5.15.y b9d57c40a767 3f2e655b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/04/21 10:20 linux-5.15.y b9d57c40a767 3f2e655b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/04/20 04:03 linux-5.15.y b9d57c40a767 303e2802 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/04/03 05:39 linux-5.15.y 91d48252ad4b 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/04/02 17:01 linux-5.15.y 91d48252ad4b 91bc79b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/04/02 17:01 linux-5.15.y 91d48252ad4b 91bc79b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/03/30 04:09 linux-5.15.y 91d48252ad4b b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/03/30 04:07 linux-5.15.y 91d48252ad4b b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/03/02 09:58 linux-5.15.y 3330a8d33e08 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/02/26 05:47 linux-5.15.y 3330a8d33e08 e0f78d93 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/02/22 12:16 linux-5.15.y 3330a8d33e08 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/02/22 12:15 linux-5.15.y 3330a8d33e08 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/02/20 17:48 linux-5.15.y 3330a8d33e08 17d780d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/02/06 23:18 linux-5.15.y 7b232985052f 97745f52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/02/06 23:18 linux-5.15.y 7b232985052f 97745f52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/02/06 23:16 linux-5.15.y 7b232985052f 97745f52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/02/06 23:16 linux-5.15.y 7b232985052f 97745f52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/02/03 15:22 linux-5.15.y 9eec9a14ee10 6df4c87a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/02/03 15:22 linux-5.15.y 9eec9a14ee10 6df4c87a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2026/01/29 16:59 linux-5.15.y 9eec9a14ee10 aeb6fdd5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2025/12/09 23:58 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
2025/12/04 18:02 linux-5.15.y cc5ec8769306 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in inet_sock_destruct
* Struck through repros no longer work on HEAD.