watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [aoe_tx0:2474] Modules linked in: irq event stamp: 66506539 hardirqs last enabled at (66506538): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (66506538): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (66506539): [] enter_from_kernel_mode+0x14/0x34 arch/arm64/kernel/entry-common.c:42 softirqs last enabled at (1296): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1300): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 0 UID: 0 PID: 2474 Comm: aoe_tx0 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] pc : _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:194 lr : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] lr : _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 sp : ffff8000a28c7700 x29: ffff8000a28c7700 x28: ffff0000d40d5bb0 x27: 0000000000000000 x26: ffff0000d40d5b40 x25: ffff0000d077e238 x24: dfff800000000000 x23: 0000000000000003 x22: 0000000000000000 x21: ffff8000914d0160 x20: ffff80009794c8e0 x19: 0000000000000000 x18: 00000000ffffffff x17: ffff800093598000 x16: ffff80008053826c x15: 0000000000000001 x14: 1ffff00012f2991c x13: 0000000000000000 x12: 0000000000000000 x11: ffff800093397d48 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : ffff800083bc188c x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000010 x2 : 0000000000000002 x1 : ffff80008ee5b741 x0 : ffff80010c42d000 Call trace: __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] (P) _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:194 (P) spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] uart_port_unlock_irqrestore include/linux/serial_core.h:788 [inline] uart_port_unlock_deref+0x108/0x2ec drivers/tty/serial/serial_core.c:91 uart_write_room+0xa4/0x15c drivers/tty/serial/serial_core.c:647 tty_write_room+0x6c/0x8c drivers/tty/tty_ioctl.c:69 handle_tx+0x128/0x5fc drivers/net/caif/caif_serial.c:212 caif_xmit+0x108/0x150 drivers/net/caif/caif_serial.c:268 __netdev_start_xmit include/linux/netdevice.h:5273 [inline] netdev_start_xmit include/linux/netdevice.h:5282 [inline] xmit_one net/core/dev.c:3853 [inline] dev_hard_start_xmit+0x298/0x890 net/core/dev.c:3869 __dev_queue_xmit+0x10c4/0x2a68 net/core/dev.c:4817 dev_queue_xmit include/linux/netdevice.h:3381 [inline] tx+0x9c/0x1cc drivers/block/aoe/aoenet.c:62 kthread+0x164/0x354 drivers/block/aoe/aoecmd.c:1241 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6562 Comm: sshd-session Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 03400005 (nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : free_pages_prepare mm/page_alloc.c:1375 [inline] pc : __free_frozen_pages+0x838/0xcb0 mm/page_alloc.c:2943 lr : free_pages_prepare mm/page_alloc.c:1370 [inline] lr : __free_frozen_pages+0x860/0xcb0 mm/page_alloc.c:2943 sp : ffff8000a19070b0 x29: ffff8000a19070e0 x28: 0000000000000001 x27: fffffdffc32427c0 x26: fffffdffc3242600 x25: fffffdffc32427c0 x24: 1ffff00011e2ebe2 x23: 0000000000000000 x22: 00003c0003242600 x21: 0000000000000003 x20: dfff800000000000 x19: fffffdffc3242600 x18: 0000000000000000 x17: 0000000000000000 x16: ffff800082e5c71c x15: 0000000000000001 x14: 1fffffbff86484fe x13: 0000000000000000 x12: 0000000000000000 x11: ffff7fbff86484ff x10: dead000000000040 x9 : fffffffffc200000 x8 : 05ffc00000000000 x7 : ffff800080bd59f0 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000003 x3 : ffff800080bd2614 x2 : 0000000000000000 x1 : 0000000000000004 x0 : 0000000000000000 Call trace: free_pages_prepare mm/page_alloc.c:1375 [inline] (P) __free_frozen_pages+0x838/0xcb0 mm/page_alloc.c:2943 (P) free_frozen_pages+0x14/0x20 mm/page_alloc.c:2981 __free_slab+0x100/0x1a4 mm/slub.c:3317 free_slab+0x28/0x160 mm/slub.c:3340 discard_slab mm/slub.c:3346 [inline] __put_partials+0x188/0x1f4 mm/slub.c:3886 put_cpu_partial+0x1d0/0x244 mm/slub.c:3961 __slab_free+0x1dc/0x23c mm/slub.c:5952 do_slab_free mm/slub.c:6616 [inline] ___cache_free+0x150/0x170 mm/slub.c:6735 qlink_free+0x48/0x94 mm/kasan/quarantine.c:163 qlist_free_all+0x44/0xb8 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x118/0x124 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x2c/0x88 mm/kasan/common.c:349 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_node_noprof+0x418/0x6c8 mm/slub.c:5315 kmalloc_reserve+0xc4/0x268 net/core/skbuff.c:586 __alloc_skb+0x208/0x3b0 net/core/skbuff.c:690 alloc_skb_fclone include/linux/skbuff.h:1433 [inline] tcp_stream_alloc_skb+0x44/0x2d0 net/ipv4/tcp.c:910 tcp_sendmsg_locked+0xae8/0x43c8 net/ipv4/tcp.c:1217 tcp_sendmsg+0x40/0x64 net/ipv4/tcp.c:1412 inet_sendmsg+0x154/0x284 net/ipv4/af_inet.c:859 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] sock_write_iter+0x298/0x3d0 net/socket.c:1195 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x540/0xa3c fs/read_write.c:686 ksys_write+0x120/0x210 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:746 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596