watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [syz.4.5:5944] Modules linked in: irq event stamp: 11330817 hardirqs last enabled at (11330816): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:357 hardirqs last disabled at (11330817): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (10731996): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (10731996): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (10731996): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (10731999): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (10731999): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (10731999): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 5944 Comm: syz.4.5 Not tainted 6.15.0-rc4-syzkaller-g43745d11bfd9 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 RIP: 0010:__sanitizer_cov_trace_switch+0x7/0x130 kernel/kcov.c:331 Code: 0a 20 c3 cc cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 06 <48> 8b 4e 08 48 83 c1 f8 48 c1 c1 3d 48 83 f9 02 7f 1e 48 85 c9 74 RSP: 0018:ffffc900000079d8 EFLAGS: 00000246 RAX: 0000000000000004 RBX: 0000000000000080 RCX: ffff888024b18000 RDX: 0000000000000100 RSI: ffffffff8f523ef0 RDI: 0000000000000000 RBP: ffffc90000007c10 R08: ffffc90000007b17 R09: 0000000000000000 R10: ffffc90000007ac0 R11: fffff52000000f63 R12: dffffc0000000000 R13: ffff88806d73d000 R14: 0000000000000000 R15: ffff88806d73d0d8 FS: 00007f8c034246c0(0000) GS:ffff8881260cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fc01ff8 CR3: 000000007d16a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ieee80211_hdrlen+0x29/0x120 net/wireless/util.c:461 __ieee80211_rx_handle_packet net/mac80211/rx.c:5159 [inline] ieee80211_rx_list+0x1876/0x2d80 net/mac80211/rx.c:5416 ieee80211_rx_napi+0x1a8/0x3d0 net/mac80211/rx.c:5439 ieee80211_rx include/net/mac80211.h:5179 [inline] ieee80211_handle_queued_frames+0xe8/0x1f0 net/mac80211/main.c:441 tasklet_action_common+0x369/0x580 kernel/softirq.c:829 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0xa3/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738 RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7090 Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 eb c3 39 f6 e8 86 43 70 f6 fb bf 01 00 00 00 4b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc90004667bc0 EFLAGS: 00000282 RAX: 6407a964b5ea0500 RBX: 0000000000000000 RCX: 6407a964b5ea0500 RDX: 0000000000000000 RSI: ffffffff8d74a0e6 RDI: 0000000000000001 RBP: ffffc90004667c60 R08: ffffffff8f7ed377 R09: 1ffffffff1efda6e R10: dffffc0000000000 R11: fffffbfff1efda6f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920008ccf78 irqentry_exit+0x6f/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__slab_alloc_node mm/slub.c:4010 [inline] RIP: 0010:slab_alloc_node mm/slub.c:4198 [inline] RIP: 0010:kmem_cache_alloc_noprof+0xaa/0x3c0 mm/slub.c:4217 Code: 0f 85 78 01 00 00 e9 6c 02 00 00 48 c7 44 24 10 00 00 00 00 41 bc ff ff ff ff 65 48 8b 05 b6 46 5e 10 49 8b 0e 4c 8b 7c 08 08 <4c> 8b 2c 08 48 8b 5c 08 10 66 90 4d 85 ed 0f 84 86 01 00 00 48 85 RSP: 0018:ffffc90004667d20 EFLAGS: 00000246 RAX: ffff8881260cc000 RBX: 0000000000000000 RCX: ffffffff927742f0 RDX: 0000000000000000 RSI: 0000000000001000 RDI: ffffffff8e05c520 RBP: 0000000000000cc0 R08: ffffc90004667aef R09: 0000000000000000 R10: ffffc90004667ae0 R11: ffffffffa0000854 R12: 00000000ffffffff R13: dffffc0000000000 R14: ffff888140408640 R15: 0000000000082cf0 getname_flags+0xb8/0x540 fs/namei.c:146 getname include/linux/fs.h:2852 [inline] do_sys_openat2+0xbc/0x1c0 fs/open.c:1423 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1455 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8c0258e969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8c03424038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f8c027b6080 RCX: 00007f8c0258e969 RDX: 00000000001c1842 RSI: 00002000000000c0 RDI: ffffffffffffff9c RBP: 00007f8c02610ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8c027b6080 R15: 00007ffd2e5f5e28 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 18 Comm: rcu_exp_gp_kthr Not tainted 6.15.0-rc4-syzkaller-g43745d11bfd9 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 RIP: 0010:io_serial_in+0x77/0xc0 drivers/tty/serial/8250/8250_port.c:409 Code: e8 9e 3c 82 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 0f 35 e4 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:ffffc90000177578 EFLAGS: 00000006 RAX: 1ffffffff3369705 RBX: 00000000000003f9 RCX: 0000000000000000 RDX: 00000000000003f9 RSI: 0000000000000000 RDI: 0000000000000020 RBP: ffffc90000177750 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: ffffffff853d81e0 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffffffff99b4bbc0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881261cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe7871a9440 CR3: 0000000069c6a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: serial_port_in include/linux/serial_core.h:791 [inline] serial8250_console_write+0x581/0x1ba0 drivers/tty/serial/8250/8250_port.c:3420 console_emit_next_record kernel/printk/printk.c:3138 [inline] console_flush_all+0x725/0xc40 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xc4/0x270 kernel/printk/printk.c:3325 vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450 _printk+0xcf/0x120 kernel/printk/printk.c:2475 synchronize_rcu_expedited_stall+0x61/0x1170 kernel/rcu/tree_exp.h:570 synchronize_rcu_expedited_wait kernel/rcu/tree_exp.h:668 [inline] rcu_exp_wait_wake kernel/rcu/tree_exp.h:687 [inline] rcu_exp_sel_wait_wake+0x7a1/0xd40 kernel/rcu/tree_exp.h:721 kthread_worker_fn+0x504/0xb60 kernel/kthread.c:1010 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245