watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz.2.79:7374] Modules linked in: irq event stamp: 16903 hardirqs last enabled at (16902): [] irqentry_exit+0xd8/0x108 kernel/entry/common.c:214 hardirqs last disabled at (16903): [] __enter_from_kernel_mode arch/arm64/kernel/entry-common.c:43 [inline] hardirqs last disabled at (16903): [] enter_from_kernel_mode+0x14/0x34 arch/arm64/kernel/entry-common.c:50 softirqs last enabled at (12334): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (12442): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (12442): [] lock_sock_nested+0x70/0x118 net/core/sock.c:3714 CPU: 0 UID: 0 PID: 7374 Comm: syz.2.79 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 : ffff80009edb78c0 x29: ffff80009edb7960 x28: 1fffe0001ad2e779 x27: 1fffe000198b57a2 x26: ffff0000cc5abd00 x25: dfff800000000000 x24: ffff700013db6f1c x23: 0000000000000001 x22: ffff0000cc5abd10 x21: ffff0000d6973bc8 x20: ffff0000d6973bd0 x19: ffff0000d6973bc0 x18: 0000000000000000 x17: 0000000000000000 x16: ffff800080536d14 x15: 0000000000000001 x14: 1fffe0001ad2e778 x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001ad2e779 x10: dfff800000000000 x9 : 0000000000000000 x8 : 0000000000000001 x7 : ffff8000892e02e0 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008b043248 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_release+0xac/0x1ae0 net/tipc/socket.c:637 __sock_release net/socket.c:649 [inline] sock_close+0xa0/0x1e4 net/socket.c:1439 __fput+0x340/0x75c fs/file_table.c:468 ____fput+0x20/0x58 fs/file_table.c:496 task_work_run+0x1dc/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xfc/0x168 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:103 [inline] el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:745 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: 7375 Comm: syz.2.79 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 : ffff8000a2e263f0 x29: ffff8000a2e26400 x28: 00000000ce1e448b x27: ffff8000a2e265c0 x26: ffff0000c9ab5ae0 x25: dfff800000000000 x24: 0000000000000001 x23: dfff800000000000 x22: 1fffe00018cb7b71 x21: ffff80008aaf940c x20: 0000000000000201 x19: ffff0000c65bdb88 x18: 00000000ffffffff x17: ffff80009353a000 x16: ffff80008052ac24 x15: 0000000000000001 x14: 1ffff000145c4d2b x13: 0000000000000000 x12: 0000000000000000 x11: ffff800093339c28 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000036c5efe x7 : ffff80008aaf92bc x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000010 x2 : 0000000000000002 x1 : ffff80008edeef84 x0 : ffff80010c566000 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_unlock_bh include/linux/spinlock_api_smp.h:167 [inline] _raw_spin_unlock_bh+0x3c/0x4c kernel/locking/spinlock.c:210 spin_unlock_bh include/linux/spinlock.h:396 [inline] tipc_skb_peek_port net/tipc/msg.h:1235 [inline] tipc_sk_rcv+0x2d8/0x2294 net/tipc/socket.c:2489 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 net/tipc/socket.c:1312 [inline] tipc_sk_filter_connect net/tipc/socket.c:2253 [inline] tipc_sk_filter_rcv+0x1220/0x277c net/tipc/socket.c:2362 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