watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [kworker/u8:7:3547] Modules linked in: irq event stamp: 31769199 hardirqs last enabled at (31769198): [] handle_softirqs+0x1a8/0x870 kernel/softirq.c:563 hardirqs last disabled at (31769199): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (31769194): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (31769194): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (31769194): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (31769197): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (31769197): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (31769197): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 3547 Comm: kworker/u8:7 Not tainted 6.16.0-rc3-syzkaller-g38d95beb4b24 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events_unbound nsim_dev_trap_report_work RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:write_comp_data kernel/kcov.c:246 [inline] RIP: 0010:__sanitizer_cov_trace_switch+0x97/0x130 kernel/kcov.c:351 Code: 54 53 48 8b 54 24 20 65 4c 8b 04 25 08 30 9d 92 45 31 c9 eb 08 49 ff c1 4c 39 c8 74 77 4e 8b 54 ce 10 65 44 8b 1d 29 d6 dc 10 <41> 81 e3 00 01 ff 00 74 13 41 81 fb 00 01 00 00 75 d9 41 83 b8 3c RSP: 0018:ffffc900000073a0 EFLAGS: 00000212 RAX: 0000000000000020 RBX: 0000000000000004 RCX: 0000000000000005 RDX: ffffffff81c22845 RSI: ffffffff8e194a60 RDI: 0000000000000004 RBP: 00000038f16828f4 R08: ffff888031091e00 R09: 000000000000000d R10: 000000000000000d R11: 0000000000000105 R12: dffffc0000000000 R13: ffff88801a486010 R14: ffff88801a486a88 R15: 00000000000e3584 FS: 0000000000000000(0000) GS:ffff888125c4d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3010cff8 CR3: 000000000df38000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rb_event_length+0x45/0x400 kernel/trace/ring_buffer.c:222 rb_read_data_buffer+0x438/0x580 kernel/trace/ring_buffer.c:1816 check_buffer+0x28a/0x750 kernel/trace/ring_buffer.c:4296 __rb_reserve_next+0x592/0xdb0 kernel/trace/ring_buffer.c:4395 rb_reserve_next_event kernel/trace/ring_buffer.c:4532 [inline] ring_buffer_lock_reserve+0xbb5/0x1010 kernel/trace/ring_buffer.c:4591 __trace_buffer_lock_reserve kernel/trace/trace.c:1090 [inline] trace_event_buffer_lock_reserve+0x1d0/0x6f0 kernel/trace/trace.c:2837 trace_event_buffer_reserve+0x248/0x340 kernel/trace/trace_events.c:672 do_trace_event_raw_event_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline] trace_event_raw_event_bpf_trace_printk+0x100/0x260 kernel/trace/bpf_trace.h:11 __do_trace_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline] trace_bpf_trace_printk+0x170/0x1d0 kernel/trace/bpf_trace.h:11 ____bpf_trace_printk kernel/trace/bpf_trace.c:380 [inline] bpf_trace_printk+0x11e/0x190 kernel/trace/bpf_trace.c:363 bpf_prog_0605f9f479290f07+0x38/0x40 bpf_dispatcher_nop_func include/linux/bpf.h:1322 [inline] __bpf_prog_run include/linux/filter.h:718 [inline] bpf_prog_run include/linux/filter.h:725 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2258 [inline] bpf_trace_run1+0x27f/0x4b0 kernel/trace/bpf_trace.c:2298 __bpf_trace_rcu_utilization+0xa1/0xf0 include/trace/events/rcu.h:27 __do_trace_rcu_utilization include/trace/events/rcu.h:27 [inline] trace_rcu_utilization+0x1ad/0x1d0 include/trace/events/rcu.h:27 rcu_core+0x12b/0x1710 kernel/rcu/tree.c:2804 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:rcu_read_unlock_special+0x87/0x4c0 kernel/rcu/tree_plugin.h:694 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 a2 65 f5 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc9000c627340 EFLAGS: 00000206 RAX: fa173938129a2100 RBX: 1ffff920018c4e70 RCX: fa173938129a2100 RDX: 0000000000000006 RSI: ffffffff8d983da8 RDI: ffffffff8be29740 RBP: ffffc9000c627438 R08: ffffffff8fa115f7 R09: 1ffffffff1f422be R10: dffffc0000000000 R11: fffffbfff1f422bf R12: ffffffff8e144200 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 __rcu_read_unlock+0x84/0xe0 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+0x19ae/0x2390 arch/x86/kernel/unwind_orc.c:680 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 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 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4249 __alloc_skb+0x112/0x2d0 net/core/skbuff.c:660 alloc_skb include/linux/skbuff.h:1336 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline] nsim_dev_trap_report_work+0x29a/0xb80 drivers/net/netdevsim/dev.c:851 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 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 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted 6.16.0-rc3-syzkaller-g38d95beb4b24 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: writeback wb_workfn (flush-8:0) RIP: 0010:ring_buffer_lock_reserve+0x175/0x1010 kernel/trace/ring_buffer.c:4585 Code: 0d 00 00 41 8b 2f 31 ff 89 ee e8 66 a7 fd ff 85 ed 0f 85 11 0c 00 00 48 81 c3 c0 01 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 30 <84> c0 0f 85 45 0d 00 00 8b 1b 4c 89 e7 48 89 de e8 56 a5 fd ff 49 RSP: 0018:ffffc90000a085b0 EFLAGS: 00000a06 RAX: 0000000000000000 RBX: ffff88801a4805c0 RCX: 0000000000000100 RDX: ffff88801d2b0000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff88801d288807 R09: 1ffff11003a51100 R10: dffffc0000000000 R11: ffffed1003a51101 R12: 000000000000000f R13: ffff88801d288800 R14: dffffc0000000000 R15: ffff88801d288804 FS: 0000000000000000(0000) GS:ffff888125d4d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f13ea01fb86 CR3: 000000000df38000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __trace_buffer_lock_reserve kernel/trace/trace.c:1090 [inline] trace_event_buffer_lock_reserve+0x1d0/0x6f0 kernel/trace/trace.c:2837 trace_event_buffer_reserve+0x248/0x340 kernel/trace/trace_events.c:672 do_trace_event_raw_event_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline] trace_event_raw_event_bpf_trace_printk+0x100/0x260 kernel/trace/bpf_trace.h:11 __do_trace_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline] trace_bpf_trace_printk+0x170/0x1d0 kernel/trace/bpf_trace.h:11 ____bpf_trace_printk kernel/trace/bpf_trace.c:380 [inline] bpf_trace_printk+0x11e/0x190 kernel/trace/bpf_trace.c:363 bpf_prog_0605f9f479290f07+0x38/0x40 bpf_dispatcher_nop_func include/linux/bpf.h:1322 [inline] __bpf_prog_run include/linux/filter.h:718 [inline] bpf_prog_run include/linux/filter.h:725 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2258 [inline] bpf_trace_run1+0x27f/0x4b0 kernel/trace/bpf_trace.c:2298 __bpf_trace_rcu_utilization+0xa1/0xf0 include/trace/events/rcu.h:27 __do_trace_rcu_utilization include/trace/events/rcu.h:27 [inline] trace_rcu_utilization+0x1ad/0x1d0 include/trace/events/rcu.h:27 rcu_core+0x1336/0x1710 kernel/rcu/tree.c:2840 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:rcu_read_unlock_special+0x87/0x4c0 kernel/rcu/tree_plugin.h:694 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 a2 65 f5 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc900001260a0 EFLAGS: 00000206 RAX: 6325b76af37a6c00 RBX: 1ffff92000024c1c RCX: 6325b76af37a6c00 RDX: 0000000000000006 RSI: ffffffff8d983da8 RDI: ffffffff8be29740 RBP: ffffc900001261a0 R08: ffffffff8fa115f7 R09: 1ffffffff1f422be R10: dffffc0000000000 R11: fffffbfff1f422bf R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8e1442e0 __rcu_read_unlock+0x84/0xe0 kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:873 [inline] pte_unmap include/linux/pgtable.h:136 [inline] page_vma_mapped_walk_done include/linux/rmap.h:935 [inline] not_found mm/page_vma_mapped.c:12 [inline] page_vma_mapped_walk+0x2001/0x2090 mm/page_vma_mapped.c:304 page_vma_mkclean_one+0x578/0x740 mm/rmap.c:1039 page_mkclean_one+0x1c0/0x280 mm/rmap.c:1100 __rmap_walk_file+0x464/0x620 mm/rmap.c:2897 rmap_walk mm/rmap.c:2941 [inline] folio_mkclean+0x297/0x390 mm/rmap.c:1132 folio_clear_dirty_for_io+0x1fa/0x8c0 mm/page-writeback.c:2964 mpage_submit_folio+0x84/0x3f0 fs/ext4/inode.c:2038 mpage_process_page_bufs+0x6d1/0xa00 fs/ext4/inode.c:2170 mpage_prepare_extent_to_map+0xe49/0x1760 fs/ext4/inode.c:2675 ext4_do_writepages+0xbf3/0x3f30 fs/ext4/inode.c:2816 ext4_writepages+0x205/0x350 fs/ext4/inode.c:2953 do_writepages+0x32b/0x550 mm/page-writeback.c:2636 __writeback_single_inode+0x145/0xff0 fs/fs-writeback.c:1680 writeback_sb_inodes+0x6b5/0x1000 fs/fs-writeback.c:1976 __writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:2047 wb_writeback+0x44f/0xaf0 fs/fs-writeback.c:2158 wb_check_old_data_flush fs/fs-writeback.c:2262 [inline] wb_do_writeback fs/fs-writeback.c:2315 [inline] wb_workfn+0xaef/0xef0 fs/fs-writeback.c:2343 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 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