watchdog: BUG: soft lockup - CPU#1 stuck for 122s! [syz.0.6755:6928] Modules linked in: irq event stamp: 22527217 hardirqs last enabled at (22527216): [] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219 hardirqs last disabled at (22527217): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (22458432): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (22458432): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (22458432): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (22458435): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (22458435): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (22458435): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 6928 Comm: syz.0.6755 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:unwind_next_frame+0x484/0x23c0 arch/x86/kernel/unwind_orc.c:520 Code: d2 84 c0 48 0f 45 d1 48 89 15 88 6c 83 11 48 85 d2 0f 84 40 02 00 00 4c 8d 62 04 4c 8d 6a 05 4c 89 e0 48 c1 e8 03 0f b6 04 28 <84> c0 0f 85 66 18 00 00 4c 89 e8 48 c1 e8 03 0f b6 04 28 84 c0 0f RSP: 0018:ffffc90000a08518 EFLAGS: 00000a07 RAX: 0000000000000000 RBX: ffffffff9007a068 RCX: ffffffff9007a06c RDX: ffffffff90832aca RSI: ffffffff90832aca RDI: ffffffff8c073da0 RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff8e55a3a0 R10: ffffc90000a08148 R11: ffffffff81afb200 R12: ffffffff90832ace R13: ffffffff90832acf R14: ffffc90000a085e8 R15: ffffffff9007a068 FS: 00007fb9547c56c0(0000) GS:ffff8881257f6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbafd326080 CR3: 00000000ad296000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6670 [inline] kmem_cache_free+0x195/0x610 mm/slub.c:6781 kfree_skb_reason include/linux/skbuff.h:1322 [inline] kfree_skb include/linux/skbuff.h:1331 [inline] ip6_mc_input+0x8de/0xbd0 net/ipv6/ip6_input.c:593 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6139 [inline] __netif_receive_skb net/core/dev.c:6252 [inline] process_backlog+0x7dd/0x1950 net/core/dev.c:6604 __napi_poll+0xae/0x340 net/core/dev.c:7668 napi_poll net/core/dev.c:7731 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7883 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:schedule_debug kernel/sched/core.c:5815 [inline] RIP: 0010:__schedule+0x19b/0x5050 kernel/sched/core.c:6740 Code: f6 48 8b 1b 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 8c 88 95 f6 48 81 3b 9d 6e ac 57 <0f> 85 a5 19 00 00 45 85 ed 7f 54 49 8d 5e 18 48 89 d8 48 c1 e8 03 RSP: 0018:ffffc90003027140 EFLAGS: 00000246 RAX: 1ffff92000604000 RBX: ffffc90003020000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff8c073de0 RDI: ffffffff8c073da0 RBP: ffffc90003027340 R08: ffffffff8fef0277 R09: 1ffffffff1fde04e R10: dffffc0000000000 R11: fffffbfff1fde04f R12: ffff8881257f6000 R13: 0000000000000001 R14: ffff8880b1fa5b80 R15: 1ffff110170e7688 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7190 irqentry_exit+0x597/0x620 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:put_cpu_partial+0x1db/0x280 mm/slub.c:3960 Code: 5b 41 5c 41 5d 41 5e 41 5f 5d e9 90 e9 ff ff 90 0f 0b 90 e9 15 ff ff ff e8 62 7f 74 09 41 f7 c5 00 02 00 00 74 cf fb 4d 85 ff <75> ce 5b 41 5c 41 5d 41 5e 41 5f 5d e9 c4 62 77 09 cc e8 3e 7f 74 RSP: 0018:ffffc90003027478 EFLAGS: 00000246 RAX: 0000000000000002 RBX: ffff88801e2a0a00 RCX: 0000000000000046 RDX: 0000000000000007 RSI: ffffffff8dccca32 RDI: ffffffff8c073e00 RBP: 0000000000000001 R08: ffffffff8fef0277 R09: 1ffffffff1fde04e R10: dffffc0000000000 R11: fffffbfff1fde04f R12: 0000000000000001 R13: 0000000000000246 R14: ffff8880b8743400 R15: 0000000000000000 __slab_free+0x294/0x320 mm/slub.c:5952 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] __kmalloc_cache_noprof+0x36f/0x6e0 mm/slub.c:5771 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] tcp_sendmsg_fastopen+0x1de/0x5e0 net/ipv4/tcp.c:1046 tcp_sendmsg_locked+0x4d12/0x55b0 net/ipv4/tcp.c:1142 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1412 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0x62c/0xad0 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb95399aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb9547c5028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb953c15fa0 RCX: 00007fb95399aeb9 RDX: 000000002600c055 RSI: 00002000000000c0 RDI: 000000000000000b RBP: 00007fb953a08c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb953c16038 R14: 00007fb953c15fa0 R15: 00007ffdcaf19b68 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 1303 Comm: aoe_tx0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:io_serial_in+0x77/0xc0 drivers/tty/serial/8250/8250_port.c:400 Code: e8 2e 30 92 fc 44 89 f9 d3 e3 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 7f 2c fb fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f c3 cc cc cc cc cc 44 89 f9 80 e1 07 RSP: 0018:ffffc9000480ef98 EFLAGS: 00000006 RAX: 1ffffffff3466f05 RBX: 00000000000003f9 RCX: 0000000000000000 RDX: 00000000000003f9 RSI: 0000000000000000 RDI: 0000000000000020 RBP: ffffc9000480f130 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: ffffffff853245f0 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffffffff9a337ae0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881256f6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000559c74941950 CR3: 0000000033f50000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: serial_port_in include/linux/serial_core.h:806 [inline] serial8250_console_write+0x540/0x1ba0 drivers/tty/serial/8250/8250_port.c:3306 console_emit_next_record kernel/printk/printk.c:3129 [inline] console_flush_one_record kernel/printk/printk.c:3215 [inline] console_flush_all+0x718/0xb20 kernel/printk/printk.c:3289 __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3359 vprintk_emit+0x485/0x560 kernel/printk/printk.c:2426 dev_vprintk_emit+0x355/0x420 drivers/base/core.c:4914 dev_printk_emit+0xee/0x140 drivers/base/core.c:4925 __netdev_printk+0x3e1/0x480 net/core/dev.c:12903 netdev_warn+0x11e/0x180 net/core/dev.c:12956 ieee802154_subif_start_xmit+0x136/0x190 net/mac802154/tx.c:232 __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+0x2cd/0x7f0 net/core/dev.c:3869 sch_direct_xmit+0x251/0x4c0 net/sched/sch_generic.c:347 __dev_xmit_skb net/core/dev.c:4169 [inline] __dev_queue_xmit+0x154b/0x3820 net/core/dev.c:4785 dev_queue_xmit include/linux/netdevice.h:3381 [inline] tx+0x6b/0x190 drivers/block/aoe/aoenet.c:62 kthread+0x1e0/0x3f0 drivers/block/aoe/aoecmd.c:1241 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246