syzbot

watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz.0.76:6894]
Modules linked in:
irq event stamp: 5181
hardirqs last  enabled at (5180): [<ffff80008b064a14>] irqentry_exit+0xd8/0x108 kernel/entry/common.c:214
hardirqs last disabled at (5181): [<ffff80008b062af0>] __enter_from_kernel_mode arch/arm64/kernel/entry-common.c:43 [inline]
hardirqs last disabled at (5181): [<ffff80008b062af0>] enter_from_kernel_mode+0x14/0x34 arch/arm64/kernel/entry-common.c:50
softirqs last  enabled at (522): [<ffff8000892e0188>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (522): [<ffff8000892e0188>] release_sock+0x14c/0x1ac net/core/sock.c:3735
softirqs last disabled at (528): [<ffff8000892f4c84>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (528): [<ffff8000892f4c84>] lock_sock_nested+0x70/0x118 net/core/sock.c:3714
CPU: 0 UID: 0 PID: 6894 Comm: syz.0.76 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 03400005 (nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : queued_spin_lock_slowpath+0x138/0xaec kernel/locking/qspinlock.c:197
lr : queued_spin_lock_slowpath+0x144/0xaec kernel/locking/qspinlock.c:197
sp : ffff8000a1a17600
x29: ffff8000a1a176a0 x28: 1fffe0001b9124c1 x27: 1fffe000196c6002
x26: ffff0000cb630000 x25: dfff800000000000 x24: ffff700014342ec4
x23: 0000000000000001 x22: ffff0000cb630010 x21: ffff0000dc892608
x20: ffff0000dc892610 x19: ffff0000dc892600 x18: 0000000000000000
x17: 0000000000000000 x16: ffff800080537d14 x15: 0000000000000001
x14: 1fffe0001b9124c0 x13: 0000000000000000 x12: 0000000000000000
x11: ffff60001b9124c1 x10: dfff800000000000 x9 : 0000000000000000
x8 : 0000000000000001 x7 : ffff8000892f4c84 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008b0885f8
x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000001
Call trace:
 __cmpwait_case_8 arch/arm64/include/asm/cmpxchg.h:229 [inline] (P)
 __cmpwait arch/arm64/include/asm/cmpxchg.h:257 [inline] (P)
 queued_spin_lock_slowpath+0x138/0xaec kernel/locking/qspinlock.c:197 (P)
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x2a8/0x2cc kernel/locking/spinlock_debug.c:116
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:127 [inline]
 _raw_spin_lock_bh+0x50/0x60 kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:356 [inline]
 lock_sock_nested+0x70/0x118 net/core/sock.c:3714
 lock_sock include/net/sock.h:1669 [inline]
 tipc_sendstream+0x50/0x84 net/tipc/socket.c:1545
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg net/socket.c:729 [inline]
 ____sys_sendmsg+0x490/0x7b8 net/socket.c:2614
 ___sys_sendmsg+0x204/0x278 net/socket.c:2668
 __sys_sendmsg net/socket.c:2700 [inline]
 __do_sys_sendmsg net/socket.c:2705 [inline]
 __se_sys_sendmsg net/socket.c:2703 [inline]
 __arm64_sys_sendmsg+0x184/0x238 net/socket.c:2703
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6895 Comm: syz.0.76 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : should_resched arch/arm64/include/asm/preempt.h:78 [inline]
pc : __local_bh_enable_ip+0x1f0/0x35c kernel/softirq.c:414
lr : __local_bh_enable_ip+0x1ec/0x35c kernel/softirq.c:412
sp : ffff8000a1806210
x29: ffff8000a1806220 x28: 0000000040613361 x27: ffff8000a18063e0
x26: ffff0000f25e3b60 x25: dfff800000000000 x24: 0000000000000001
x23: dfff800000000000 x22: 1fffe000196c63d1 x21: ffff80008ab3e7b8
x20: 0000000000000201 x19: ffff0000cb631e88 x18: 00000000ffffffff
x17: ffff800093605000 x16: ffff80008052bc24 x15: 0000000000000001
x14: 1fffe0001b9124c0 x13: 0000000000000000 x12: 0000000000000000
x11: ffff800093404c28 x10: 0000000000000003 x9 : 0000000000000000
x8 : 000000000382547a x7 : ffff80008ab4aee0 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000010
x2 : 0000000000000002 x1 : ffff80008ee54d8e x0 : ffff80010c40c000
Call trace:
 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] (P)
 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] (P)
 __local_bh_enable_ip+0x1f0/0x35c kernel/softirq.c:412 (P)
 __raw_spin_trylock_bh include/linux/spinlock_api_smp.h:177 [inline]
 _raw_spin_trylock_bh+0x68/0x80 kernel/locking/spinlock.c:146
 spin_trylock_bh include/linux/spinlock.h:411 [inline]
 tipc_sk_rcv+0x2f4/0x2294 net/tipc/socket.c:2494
 tipc_node_xmit+0x18c/0xc9c net/tipc/node.c:1701
 tipc_node_xmit_skb net/tipc/node.c:1766 [inline]
 tipc_node_distr_xmit+0x248/0x33c net/tipc/node.c:1781
 tipc_sk_rcv+0x1df0/0x2294 net/tipc/socket.c:2499
 tipc_node_xmit+0x18c/0xc9c net/tipc/node.c:1701
 tipc_sk_push_backlog+0x398/0x744 net/tipc/socket.c:1312
 tipc_sk_conn_proto_rcv net/tipc/socket.c:1366 [inline]
 tipc_sk_proto_rcv+0x704/0x12ec net/tipc/socket.c:2156
 tipc_sk_filter_rcv+0x2524/0x277c net/tipc/socket.c:2350
 tipc_sk_enqueue net/tipc/socket.c:2443 [inline]
 tipc_sk_rcv+0x628/0x2294 net/tipc/socket.c:2495
 tipc_node_xmit+0x18c/0xc9c net/tipc/node.c:1701
 tipc_node_xmit_skb net/tipc/node.c:1766 [inline]
 tipc_node_distr_xmit+0x248/0x33c net/tipc/node.c:1781
 tipc_sk_backlog_rcv+0x164/0x214 net/tipc/socket.c:2410
 sk_backlog_rcv include/net/sock.h:1150 [inline]
 __release_sock+0x19c/0x39c net/core/sock.c:3172
 release_sock+0x60/0x1ac net/core/sock.c:3726
 sockopt_release_sock net/core/sock.c:1155 [inline]
 sk_setsockopt+0x2354/0x28ec net/core/sock.c:1668
 sock_setsockopt+0x68/0x80 net/core/sock.c:1675
 do_sock_setsockopt+0x19c/0x328 net/socket.c:2340
 __sys_setsockopt net/socket.c:2369 [inline]
 __do_sys_setsockopt net/socket.c:2375 [inline]
 __se_sys_setsockopt net/socket.c:2372 [inline]
 __arm64_sys_setsockopt+0x170/0x1e0 net/socket.c:2372
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596