watchdog: BUG: soft lockup - CPU#1 stuck for 138s! [syz.1.134:7025] Modules linked in: irq event stamp: 14044395 hardirqs last enabled at (14044394): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:310 hardirqs last disabled at (14044395): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (14035238): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (14035238): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (14035238): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (14035241): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (14035241): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (14035241): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 1 UID: 0 PID: 7025 Comm: syz.1.134 Not tainted 6.16.0-rc6-syzkaller-g95993dc3039e #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5875 Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 9b d3 01 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc90000a07af8 EFLAGS: 00000206 RAX: 910565e4bdf3d300 RBX: 0000000000000000 RCX: 910565e4bdf3d300 RDX: 0000000000000000 RSI: ffffffff8db8654b RDI: ffffffff8be29f40 RBP: ffffffff8172aae5 R08: 0000000000000000 R09: ffffffff8172aae5 R10: ffffc90000a07cc8 R11: fffff52000140fa5 R12: 0000000000000002 R13: ffffffff8e13f0e0 R14: 0000000000000000 R15: 0000000000000246 FS: 00007fd1587f66c0(0000) GS:ffff888125d1f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4f7fff97d0 CR3: 0000000079456000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] class_rcu_constructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 __unwind_start+0x5b9/0x760 arch/x86/kernel/unwind_orc.c:758 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2381 [inline] slab_free mm/slub.c:4643 [inline] kfree+0x18e/0x440 mm/slub.c:4842 ieee80211_inform_bss+0xbd9/0x10a0 net/mac80211/scan.c:160 rdev_inform_bss net/wireless/rdev-ops.h:418 [inline] cfg80211_inform_single_bss_data+0xd05/0x1ac0 net/wireless/scan.c:2367 cfg80211_inform_bss_data+0x1fb/0x3b20 net/wireless/scan.c:3222 cfg80211_inform_bss_frame_data+0x3d7/0x730 net/wireless/scan.c:3313 ieee80211_bss_info_update+0x746/0x9e0 net/mac80211/scan.c:226 ieee80211_scan_rx+0x593/0xa20 net/mac80211/scan.c:355 __ieee80211_rx_handle_packet net/mac80211/rx.c:5183 [inline] ieee80211_rx_list+0x22fc/0x2d80 net/mac80211/rx.c:5420 ieee80211_rx_napi+0x1a8/0x3d0 net/mac80211/rx.c:5443 ieee80211_rx include/net/mac80211.h:5185 [inline] ieee80211_handle_queued_frames+0xe8/0x1f0 net/mac80211/main.c:441 tasklet_action_common+0x36c/0x580 kernel/softirq.c:829 handle_softirqs+0x286/0x870 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:7109 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 8b 2d 21 f6 e8 c6 00 58 f6 fb bf 01 00 00 00 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc90003a1ed00 EFLAGS: 00000286 RAX: 910565e4bdf3d300 RBX: 0000000000000000 RCX: 910565e4bdf3d300 RDX: 0000000000000006 RSI: ffffffff8d99882e RDI: 0000000000000001 RBP: ffffc90003a1edb0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000743da0 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__sanitizer_cov_trace_pc+0x46/0x70 kernel/kcov.c:222 Code: ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00 00 74 2c 8b 91 18 16 00 00 83 fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 <48> 8d 7e 01 8b 89 1c 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 RSP: 0018:ffffc90003a1ee78 EFLAGS: 00000246 RAX: ffffffff84f5a703 RBX: dffffc0000000000 RCX: ffff88802ad33c00 RDX: ffffc9000d04e000 RSI: 0000000000002992 RDI: 0000000000000000 RBP: 0000000000000017 R08: ffffc90003a1f047 R09: 0000000000000000 R10: ffffc90003a1f020 R11: fffff52000743e09 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880797ab8c0 skb_tailroom include/linux/skbuff.h:2852 [inline] nla_put+0x63/0x150 lib/nlattr.c:1096 nla_nest_start_noflag include/net/netlink.h:2216 [inline] ctrl_fill_info+0x674/0x1070 net/netlink/genetlink.c:1261 ctrl_dumpfamily+0x250/0x380 net/netlink/genetlink.c:1369 genl_dumpit+0x108/0x1b0 net/netlink/genetlink.c:1027 netlink_dump+0x6db/0xe60 net/netlink/af_netlink.c:2327 __netlink_dump_start+0x5cb/0x7e0 net/netlink/af_netlink.c:2442 genl_family_rcv_msg_dumpit+0x1e7/0x2c0 net/netlink/genetlink.c:1076 genl_family_rcv_msg net/netlink/genetlink.c:1192 [inline] genl_rcv_msg+0x5da/0x790 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2552 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x759/0x8e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:727 ____sys_sendmsg+0x505/0x830 net/socket.c:2566 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd15a98e9a9 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:00007fd1587f6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fd15abb5fa0 RCX: 00007fd15a98e9a9 RDX: 0000000000040810 RSI: 00002000000000c0 RDI: 0000000000000009 RBP: 00007fd15aa10d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fd15abb5fa0 R15: 00007ffca820dca8 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 18 Comm: rcu_exp_gp_kthr Not tainted 6.16.0-rc6-syzkaller-g95993dc3039e #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:spec_flag lib/vsprintf.c:2567 [inline] RIP: 0010:format_decode+0x141/0xe30 lib/vsprintf.c:2632 Code: c1 ec 03 41 0f b6 04 14 84 c0 75 7c 0f b6 45 00 04 e0 0f b6 d8 bf 11 00 00 00 89 de e8 88 74 55 f6 80 fb 11 0f 83 b2 00 00 00 <4c> 8d ab c0 e2 b9 8c 4c 89 e8 48 c1 e8 03 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc900001770f0 EFLAGS: 00000297 RAX: ffffffff8b6ab768 RBX: 0000000000000010 RCX: 0000000000000000 RDX: ffff88801d6d1e00 RSI: 0000000000000010 RDI: 0000000000000011 RBP: ffffffff8b8b8947 R08: ffff88801d6d1e00 R09: 0000000000000002 R10: 0000000000000025 R11: 0000000000000000 R12: 1ffffffff1717128 R13: ffffc90000177198 R14: 1ffff9200002ee33 R15: ffffffff8b8b8947 FS: 0000000000000000(0000) GS:ffff888125c1f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31711ff8 CR3: 000000003227e000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: vsnprintf+0x102/0xf00 lib/vsprintf.c:2817 sprintf+0xd9/0x120 lib/vsprintf.c:3037 print_time kernel/printk/printk.c:1381 [inline] info_print_prefix+0x155/0x310 kernel/printk/printk.c:1407 record_print_text+0x154/0x430 kernel/printk/printk.c:1456 printk_get_next_message+0x26d/0x7b0 kernel/printk/printk.c:3024 console_emit_next_record kernel/printk/printk.c:3092 [inline] console_flush_all+0x4ca/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+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245