watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.2.55:6787] Modules linked in: irq event stamp: 15326805 hardirqs last enabled at (15326804): [] irqentry_exit+0x63/0x90 kernel/entry/common.c:357 hardirqs last disabled at (15326805): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (48368): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (48368): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (48368): [] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680 softirqs last disabled at (48371): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (48371): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (48371): [] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680 CPU: 1 UID: 0 PID: 6787 Comm: syz.2.55 Not tainted 6.15.0-rc2-syzkaller-g1a1d569a75f3 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:rcu_read_unlock_special+0x93/0x570 kernel/rcu/tree_plugin.h:694 Code: 04 14 66 41 c7 44 14 09 f3 f3 41 c6 44 14 0b f3 65 44 8b 3d 3f 4d bf 11 41 f7 c7 00 00 f0 00 74 44 48 c7 44 24 20 0e 36 e0 45 <4a> c7 04 22 00 00 00 00 66 42 c7 44 22 09 00 00 42 c6 44 22 0b 00 RSP: 0018:ffffc90000a082e0 EFLAGS: 00000206 RAX: 0c080a77e4a57700 RBX: 1ffff92000141064 RCX: ffffffff9368d020 RDX: dffffc0000000000 RSI: ffffffff8e69d047 RDI: ffffffff8ca1b760 RBP: ffffc90000a083c0 R08: ffffffff905fe177 R09: 1ffffffff20bfc2e R10: dffffc0000000000 R11: fffffbfff20bfc2f R12: 1ffff92000141060 R13: ffff88803489a260 R14: ffffc90000a08320 R15: ffffffff8ed42d00 FS: 00007f34effd16c0(0000) GS:ffff888125093000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32315ff8 CR3: 0000000031a5e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __rcu_read_unlock+0xa1/0x110 kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:873 [inline] class_rcu_destructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0x1aa4/0x23b0 arch/x86/kernel/unwind_orc.c:680 arch_stack_walk+0x11e/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122 save_stack+0xfc/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x76/0x1e0 mm/page_owner.c:308 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] __free_frozen_pages+0xde8/0x10a0 mm/page_alloc.c:2680 __folio_put+0x2b5/0x360 mm/swap.c:112 skb_page_unref include/linux/skbuff_ref.h:43 [inline] __skb_frag_unref include/linux/skbuff_ref.h:56 [inline] skb_release_data+0x486/0x8b0 net/core/skbuff.c:1091 skb_release_all net/core/skbuff.c:1162 [inline] __kfree_skb+0x55/0x70 net/core/skbuff.c:1176 tcp_rtx_queue_purge net/ipv4/tcp.c:3277 [inline] tcp_write_queue_purge+0x212/0x2f0 net/ipv4/tcp.c:3290 tcp_done_with_error+0x41/0xc0 net/ipv4/tcp_input.c:4545 tcp_write_err net/ipv4/tcp_timer.c:77 [inline] tcp_write_timeout net/ipv4/tcp_timer.c:294 [inline] tcp_retransmit_timer+0x1589/0x32c0 net/ipv4/tcp_timer.c:600 tcp_write_timer+0x166/0x2e0 net/ipv4/tcp_timer.c:738 call_timer_fn+0x189/0x650 kernel/time/timer.c:1789 expire_timers kernel/time/timer.c:1840 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x66e/0x8e0 kernel/time/timer.c:2426 run_timer_base kernel/time/timer.c:2435 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2445 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:preempt_schedule_irq+0xf9/0x1c0 kernel/sched/core.c:7090 Code: 89 fe 49 c1 ee 03 eb 0d 48 f7 03 08 00 00 00 0f 84 89 00 00 00 bf 01 00 00 00 e8 82 94 5e f5 e8 3d 53 99 f5 fb bf 01 00 00 00 32 a5 ff ff 43 80 3c 26 00 74 08 4c 89 ff e8 23 9b fb f5 48 c7 RSP: 0018:ffffc9000485fae0 EFLAGS: 00000286 RAX: 0c080a77e4a57700 RBX: 1ffff9200090bf64 RCX: ffffffff81cb465c RDX: 0000000000000000 RSI: ffffffff8e69d047 RDI: 0000000000000001 RBP: ffffc9000485fba0 R08: ffffffff905fe177 R09: 1ffffffff20bfc2e R10: dffffc0000000000 R11: fffffbfff20bfc2f R12: dffffc0000000000 R13: 1ffff9200090bf5c R14: 1ffff9200090bf60 R15: ffffc9000485fb00 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:kasan_byte_accessible+0x16/0x20 mm/kasan/generic.c:201 Code: 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df 0f b6 04 07 <3c> 08 0f 92 c0 c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc9000485fc68 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: ffff88807c73b3e0 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8213e456 RDI: 1ffff1100f8e767c RBP: ffffffff9368d020 R08: 0000000000000001 R09: 0000000000000000 R10: ffffc9000485fda0 R11: fffff5200090bfc7 R12: 0000000000000001 R13: 0000000000000001 R14: ffffffff8213e456 R15: ffff88807c73b3e0 __kasan_check_byte+0x14/0x40 mm/kasan/common.c:556 kasan_check_byte include/linux/kasan.h:399 [inline] lock_acquire+0x89/0x2f0 kernel/locking/lockdep.c:5840 __might_fault+0xc6/0x120 mm/memory.c:7151 _inline_copy_from_user include/linux/uaccess.h:162 [inline] _copy_from_user+0x28/0xb0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] copy_from_bpfptr_offset include/linux/bpfptr.h:53 [inline] copy_from_bpfptr include/linux/bpfptr.h:59 [inline] __sys_bpf+0x1c5/0x8b0 kernel/bpf/syscall.c:5807 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline] __se_sys_bpf kernel/bpf/syscall.c:5939 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5939 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f34ef18e169 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:00007f34effd1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f34ef3b5fa0 RCX: 00007f34ef18e169 RDX: 0000000000000048 RSI: 0000200000000380 RDI: 0000000000000000 RBP: 00007f34ef210a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f34ef3b5fa0 R15: 00007fff92106e18 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5857 Comm: kworker/u9:7 Not tainted 6.15.0-rc2-syzkaller-g1a1d569a75f3 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: hci0 hci_cmd_timeout RIP: 0010:vsnprintf+0xafd/0x1230 lib/vsprintf.c:-1 Code: ef e8 87 ef 00 f6 4d 8b 7d 00 4c 8b 6c 24 08 eb 19 e8 37 b6 96 f5 4c 8b 6c 24 08 4c 8b 74 24 28 8b 4c 24 30 41 d3 ff 4d 63 ff <48> 8b 44 24 50 42 80 3c 20 00 74 0d 48 8d bc 24 a0 00 00 00 e8 4a RSP: 0018:ffffc90003f3eee0 EFLAGS: 00000246 RAX: 1ffff920007e7e04 RBX: ffffffff8c4b6ae5 RCX: ffff88805f4d3c00 RDX: 0000000000000000 RSI: 0000000000000010 RDI: ffffc90003f3f070 RBP: ffffc90003f3eff0 R08: ffffffff8c2c9619 R09: ffffffff8c2c95a0 R10: 0000000000000008 R11: ffff88805f4d3c00 R12: dffffc0000000000 R13: ffffc90083f3f23f R14: ffffc90003f3f068 R15: 0000000000000162 FS: 0000000000000000(0000) GS:ffff888124f93000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff58d60f2c CR3: 00000000345e8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: sprintf+0xdc/0x130 lib/vsprintf.c:3015 print_time kernel/printk/printk.c:1381 [inline] info_print_prefix+0x16d/0x310 kernel/printk/printk.c:1407 record_print_text+0x14a/0x430 kernel/printk/printk.c:1456 printk_get_next_message+0x65b/0x8b0 kernel/printk/printk.c:3024 console_emit_next_record kernel/printk/printk.c:3092 [inline] console_flush_all+0x56b/0xec0 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0x151/0x3b0 kernel/printk/printk.c:3325 vprintk_emit+0x761/0xa40 kernel/printk/printk.c:2450 _printk+0xd5/0x120 kernel/printk/printk.c:2475 bt_err+0x126/0x180 net/bluetooth/lib.c:296 hci_cmd_timeout+0x104/0x1e0 net/bluetooth/hci_core.c:1457 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd50 kernel/workqueue.c:3400 kthread+0x7b7/0x940 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