ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 watchdog: BUG: soft lockup - CPU#1 stuck for 267s! [aoe_tx0:1297] Modules linked in: irq event stamp: 473425731 hardirqs last enabled at (473425730): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (473425730): [] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194 hardirqs last disabled at (473425731): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (11032): [] rcu_lock_release include/linux/rcupdate.h:341 [inline] softirqs last enabled at (11032): [] rcu_read_unlock_bh include/linux/rcupdate.h:908 [inline] softirqs last enabled at (11032): [] __dev_queue_xmit+0xaf1/0x4490 net/core/dev.c:4752 softirqs last disabled at (11038): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (11038): [] rcu_read_lock_bh include/linux/rcupdate.h:892 [inline] softirqs last disabled at (11038): [] __dev_queue_xmit+0x276/0x4490 net/core/dev.c:4650 CPU: 1 UID: 0 PID: 1297 Comm: aoe_tx0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194 Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 26 8e 02 f6 48 89 df e8 0e e2 02 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 e5 de f2 f5 65 8b 05 be 6b 41 08 85 c0 74 16 5b RSP: 0018:ffffc9000412f968 EFLAGS: 00000246 RAX: 0000000000000006 RBX: ffffffff9b107200 RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffffffff8de50a8c RDI: ffffffff8c163400 RBP: 0000000000000293 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90aba697 R11: 0000000000000000 R12: ffffffff8f2f1080 R13: ffffffff9b107308 R14: 0000000000000000 R15: ffffffff9b107340 FS: 0000000000000000(0000) GS:ffff8881247b6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001000 CR3: 0000000055ab4000 CR4: 0000000000350ef0 Call Trace: spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] uart_port_unlock_irqrestore include/linux/serial_core.h:788 [inline] uart_port_unlock_deref drivers/tty/serial/serial_core.c:91 [inline] uart_port_unlock_deref drivers/tty/serial/serial_core.c:88 [inline] uart_write_room+0x2d9/0x940 drivers/tty/serial/serial_core.c:650 tty_write_room+0x66/0x90 drivers/tty/tty_ioctl.c:69 handle_tx+0x14f/0x630 drivers/net/caif/caif_serial.c:212 __netdev_start_xmit include/linux/netdevice.h:5222 [inline] netdev_start_xmit include/linux/netdevice.h:5231 [inline] xmit_one net/core/dev.c:3839 [inline] dev_hard_start_xmit+0x97/0x740 net/core/dev.c:3855 __dev_queue_xmit+0xa46/0x4490 net/core/dev.c:4725 dev_queue_xmit include/linux/netdevice.h:3361 [inline] tx+0xcc/0x190 drivers/block/aoe/aoenet.c:62 kthread+0x1e4/0x3e0 drivers/block/aoe/aoecmd.c:1241 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 3003 Comm: kworker/u8:10 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Workqueue: bat_events batadv_nc_worker RIP: 0010:check_wait_context kernel/locking/lockdep.c:4877 [inline] RIP: 0010:__lock_acquire+0x317/0x1ce0 kernel/locking/lockdep.c:5187 Code: 48 8d 04 80 48 8d 0c c5 60 69 dd 95 0f b6 81 c4 00 00 00 84 c0 74 0f 38 c2 0f 47 d0 80 b9 c6 00 00 00 02 0f 44 d0 41 83 c6 01 <45> 3b b5 e8 0a 00 00 7d 2f 49 63 c6 48 8d 04 80 0f b7 44 c3 20 66 RSP: 0018:ffffc9000b2079e0 EFLAGS: 00000002 RAX: 0000000000000000 RBX: ffff88802fe446f0 RCX: ffffffff95e33a70 RDX: 0000000000000005 RSI: 0000000000000002 RDI: ffff88802fe44740 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000050 R11: 0000000000000001 R12: ffff88802fe44740 R13: ffff88802fe43c00 R14: 0000000000000001 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881246b6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffda975bee0 CR3: 00000000323d0000 CR4: 0000000000350ef0 Call Trace: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0x16a/0x1030 net/batman-adv/network-coding.c:719 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245