WARNING in __rds_conn_create

Status: upstream: reported syz repro on 2026/11/08 04:34
Reported-by: syzbot+112c08c3f09e72b48406@syzkaller.appspotmail.com
First crash: 5d08h, last: 5d07h
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __rds_conn_create rds -1 1 483d 483d 0/29 closed as invalid on 2025/08/19 19:15
upstream WARNING in __rds_conn_create (2) prio:low rds -1 syz 49 11d 28d 26/29 upstream: reported syz repro on 2026/10/16 02:45

Sample crash report:
------------[ cut here ]------------
raw_local_irq_restore() called with IRQs enabled
WARNING: CPU: 0 PID: 4565 at kernel/locking/irqflag-debug.c:10 warn_bogus_irq_restore+0x34/0x44 kernel/locking/irqflag-debug.c:10
Modules linked in:
CPU: 0 PID: 4565 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : warn_bogus_irq_restore+0x34/0x44 kernel/locking/irqflag-debug.c:10
lr : warn_bogus_irq_restore+0x34/0x44 kernel/locking/irqflag-debug.c:10
sp : ffff8000224575b0
x29: ffff8000224575b0 x28: ffff0000cc1e8550 x27: 0000000000000000
x26: 00000000000000a0 x25: 1ffff0000318c7dc x24: ffff0000df1f5000
x23: ffff0000ded34000 x22: dfff800000000000 x21: 0000000000000000
x20: ffff800018c60840 x19: 0000000000000000 x18: 00000000d5900085
x17: 0000000000000000 x16: ffff800011ba16d0 x15: 0000000000000000
x14: 0000000000000001 x13: 1fffe00033c217a3 x12: 0000000000000000
x11: ff0080000819676c x10: 0000000000000000 x9 : e62c6ea37d026100
x8 : e62c6ea37d026100 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800022457038 x4 : ffff8000164c4fa0 x3 : ffff800008545104
x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
 warn_bogus_irq_restore+0x34/0x44 kernel/locking/irqflag-debug.c:10
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
 _raw_spin_unlock_irqrestore+0xa0/0xac kernel/locking/spinlock.c:194
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 __rds_conn_create+0x155c/0x1944 net/rds/connection.c:351
 rds_conn_create_outgoing+0x60/0x7c net/rds/connection.c:374
 rds_sendmsg+0xcac/0x191c net/rds/send.c:1303
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x588/0x90c net/socket.c:2519
 ___sys_sendmsg net/socket.c:2573 [inline]
 __sys_sendmsg+0x288/0x374 net/socket.c:2602
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg net/socket.c:2609 [inline]
 __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2609
 __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+0x58/0x12c 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:589
irq event stamp: 514
hardirqs last  enabled at (513): [<ffff800008316468>] __up_console_sem+0xb4/0xfc kernel/printk/printk.c:261
hardirqs last disabled at (514): [<ffff800011b9d7f8>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (330): [<ffff80000fe648e4>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (330): [<ffff80000fe648e4>] release_sock+0x16c/0x1bc net/core/sock.c:3554
softirqs last disabled at (328): [<ffff80000fe647ac>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (328): [<ffff80000fe647ac>] release_sock+0x34/0x1bc net/core/sock.c:3541
---[ end trace 0000000000000000 ]---

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/11/08 05:16 linux-6.1.y c75b0cf0982c 5cecaf1f .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in __rds_conn_create
2026/11/08 04:34 linux-6.1.y c75b0cf0982c 5cecaf1f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in __rds_conn_create
* Struck through repros no longer work on HEAD.