watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz-executor.0:30934] Modules linked in: irq event stamp: 13485455 hardirqs last enabled at (13485454): [<ffffffff8a60140a>] asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 hardirqs last disabled at (13485455): [<ffffffff8a3eb22e>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1074 softirqs last enabled at (9056548): [<ffffffff814fd617>] invoke_softirq kernel/softirq.c:427 [inline] softirqs last enabled at (9056548): [<ffffffff814fd617>] __irq_exit_rcu kernel/softirq.c:632 [inline] softirqs last enabled at (9056548): [<ffffffff814fd617>] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 softirqs last disabled at (9056551): [<ffffffff814fd617>] invoke_softirq kernel/softirq.c:427 [inline] softirqs last disabled at (9056551): [<ffffffff814fd617>] __irq_exit_rcu kernel/softirq.c:632 [inline] softirqs last disabled at (9056551): [<ffffffff814fd617>] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 CPU: 1 PID: 30934 Comm: syz-executor.0 Not tainted 6.6.0-rc2-syzkaller-g831916fb93d4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline] RIP: 0010:write_comp_data+0x21/0x90 kernel/kcov.c:236 Code: 2e 0f 1f 84 00 00 00 00 00 65 8b 05 e1 f3 7b 7e 49 89 f1 89 c6 49 89 d2 81 e6 00 01 00 00 49 89 f8 65 48 8b 14 25 c0 bc 03 00 <a9> 00 01 ff 00 74 0e 85 f6 74 59 8b 82 04 16 00 00 85 c0 74 4f 8b RSP: 0018:ffffc900001f05b8 EFLAGS: 00000206 RAX: 0000000000000103 RBX: 0000000000000002 RCX: ffffffff813a4dad RDX: ffff88807b255940 RSI: 0000000000000100 RDI: 0000000000000001 RBP: ffffffff8a89cee0 R08: 0000000000000001 R09: 0000000000000003 R10: 0000000000000002 R11: dffffc0000000000 R12: 0000000000000002 R13: 0000000000000001 R14: 0000000000000003 R15: 0000000000000002 FS: 00007f90f71d26c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30829000 CR3: 0000000019f14000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> __sanitizer_cov_trace_switch+0x54/0x90 kernel/kcov.c:341 unwind_next_frame+0x77d/0x2390 arch/x86/kernel/unwind_orc.c:581 arch_stack_walk+0xfa/0x170 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x96/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826 slab_free mm/slub.c:3809 [inline] kmem_cache_free+0xf0/0x480 mm/slub.c:3831 skb_kfree_head net/core/skbuff.c:947 [inline] skb_kfree_head net/core/skbuff.c:944 [inline] skb_free_head+0x17f/0x1b0 net/core/skbuff.c:961 skb_release_data+0x5ba/0x870 net/core/skbuff.c:991 skb_release_all net/core/skbuff.c:1057 [inline] __kfree_skb+0x51/0x70 net/core/skbuff.c:1071 tcp_wmem_free_skb include/net/tcp.h:300 [inline] tcp_write_queue_purge+0x186/0xd60 net/ipv4/tcp.c:2958 tcp_write_err net/ipv4/tcp_timer.c:75 [inline] tcp_probe_timer net/ipv4/tcp_timer.c:411 [inline] tcp_write_timer_handler net/ipv4/tcp_timer.c:685 [inline] tcp_write_timer_handler+0x49c/0xa00 net/ipv4/tcp_timer.c:655 tcp_write_timer+0xa6/0x2b0 net/ipv4/tcp_timer.c:698 call_timer_fn+0x19e/0x580 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x764/0xb10 kernel/time/timer.c:2022 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035 __do_softirq+0x218/0x965 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1074 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:preempt_latency_start kernel/sched/core.c:5827 [inline] RIP: 0010:preempt_latency_start kernel/sched/core.c:5822 [inline] RIP: 0010:preempt_count_add+0x7f/0x140 kernel/sched/core.c:5850 Code: df 0f a9 7e 25 ff ff ff 7f 39 c3 74 03 5b 5d c3 48 8b 5c 24 10 48 89 df e8 ee 3f 0e 00 85 c0 75 35 65 48 8b 2c 25 c0 bc 03 00 <48> 8d bd b0 14 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffffc9000b1b7598 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffffff813a46fa RCX: 1ffffffff245bebc RDX: 0000000000000000 RSI: ffffffff813a4697 RDI: ffffffff813a46fa RBP: ffff88807b255940 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: fffff52001636ed3 R14: fffff52001636ed2 R15: ffffc9000b1b7628 unwind_next_frame+0xca/0x2390 arch/x86/kernel/unwind_orc.c:479 __unwind_start+0x5a4/0x880 arch/x86/kernel/unwind_orc.c:760 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xaf/0x170 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x96/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slub.c:3478 [inline] slab_alloc mm/slub.c:3486 [inline] __kmem_cache_alloc_lru mm/slub.c:3493 [inline] kmem_cache_alloc+0x16c/0x3b0 mm/slub.c:3502 kmem_cache_zalloc include/linux/slab.h:710 [inline] lsm_file_alloc security/security.c:612 [inline] security_file_alloc+0x41/0x250 security/security.c:2603 init_file+0xb9/0x2d0 fs/file_table.c:161 alloc_empty_file+0x91/0x1d0 fs/file_table.c:210 path_openat+0xdc/0x29c0 fs/namei.c:3782 do_filp_open+0x1de/0x430 fs/namei.c:3823 do_sys_openat2+0x176/0x1e0 fs/open.c:1422 do_sys_open fs/open.c:1437 [inline] __do_sys_openat fs/open.c:1453 [inline] __se_sys_openat fs/open.c:1448 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1448 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f90f647cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f90f71d20c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f90f659bf80 RCX: 00007f90f647cae9 RDX: 00000000000026e1 RSI: 0000000020000340 RDI: ffffffffffffff9c RBP: 00007f90f64c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f90f659bf80 R15: 00007ffe9724f208 </TASK> Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 30924 Comm: syz-executor.5 Not tainted 6.6.0-rc2-syzkaller-g831916fb93d4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 RIP: 0010:kvm_sched_clock_read+0x18/0x20 arch/x86/kernel/kvmclock.c:92 Code: 5d e9 9c 0c 00 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 65 48 8b 3d 9c cd c3 75 e8 1f 00 00 00 48 2b 05 10 5a 1e 02 <c3> 0f 1f 80 00 00 00 00 f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 RSP: 0018:ffffc900000073c0 EFLAGS: 00000016 RAX: 0000011a7c5c09c3 RBX: ffff8880b9828850 RCX: 0000011b5d2ab4b1 RDX: 000000000000000c RSI: 0000000000000001 RDI: ffffffff9061d000 RBP: 1ffff92000000e81 R08: 0000000000000000 R09: fffffbfff1d9caa2 R10: ffffffff8ece5517 R11: 0000000000000000 R12: 0000000000028850 R13: ffff88809e603b80 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200cb000 CR3: 0000000029966000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <IRQ> sched_clock+0x17/0x60 arch/x86/kernel/tsc.c:283 sched_clock_cpu+0x6d/0x4c0 kernel/sched/clock.c:394 irqtime_account_irq+0x79/0x2d0 kernel/sched/cputime.c:64 account_hardirq_exit include/linux/vtime.h:159 [inline] __irq_exit_rcu kernel/softirq.c:629 [inline] irq_exit_rcu+0x21/0x120 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x47/0xc0 arch/x86/kernel/apic/apic.c:1074 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:__sanitizer_cov_trace_switch+0x4f/0x90 kernel/kcov.c:341 Code: 83 f8 10 75 2f 41 bd 03 00 00 00 4c 8b 75 00 31 db 4d 85 f6 74 1e 48 8b 74 dd 10 4c 89 e2 4c 89 ef 48 83 c3 01 48 8b 4c 24 28 <e8> 1c fe ff ff 49 39 de 75 e2 5b 5d 41 5c 41 5d 41 5e c3 48 83 f8 RSP: 0018:ffffc900000075a0 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000008 RCX: ffffffff813a4ce5 RDX: 0000000000000005 RSI: 0000000000000009 RDI: 0000000000000001 RBP: ffffffff8a89cf40 R08: 0000000000000001 R09: 0000000000000008 R10: 0000000000000005 R11: dffffc0000000000 R12: 0000000000000005 R13: 0000000000000001 R14: 0000000000000008 R15: ffffc90000007685 unwind_next_frame+0x6b5/0x2390 arch/x86/kernel/unwind_orc.c:515 arch_stack_walk+0xfa/0x170 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x96/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826 slab_free mm/slub.c:3809 [inline] __kmem_cache_free+0xb8/0x2f0 mm/slub.c:3822 ref_tracker_free+0x377/0x810 lib/ref_tracker.c:272 __netns_tracker_free include/net/net_namespace.h:350 [inline] put_net_track include/net/net_namespace.h:365 [inline] __sk_destruct+0x38e/0x770 net/core/sock.c:2214 sk_destruct+0xc2/0xf0 net/core/sock.c:2233 __sk_free+0xc4/0x3a0 net/core/sock.c:2244 sk_free+0x7c/0xa0 net/core/sock.c:2255 sock_put include/net/sock.h:1990 [inline] tcp_write_timer+0x24b/0x2b0 net/ipv4/tcp_timer.c:705 call_timer_fn+0x19e/0x580 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x764/0xb10 kernel/time/timer.c:2022 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035 __do_softirq+0x218/0x965 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1074 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:write_comp_data+0x3c/0x90 kernel/kcov.c:236 Code: 01 00 00 49 89 f8 65 48 8b 14 25 c0 bc 03 00 a9 00 01 ff 00 74 0e 85 f6 74 59 8b 82 04 16 00 00 85 c0 74 4f 8b 82 e0 15 00 00 <83> f8 03 75 44 48 8b 82 e8 15 00 00 8b 92 e4 15 00 00 48 8b 38 48 RSP: 0018:ffffc90008d1f3d8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000080000000 RCX: ffffffff813a5884 RDX: ffff88809e603b80 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffffc90008d1f808 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000001 R12: ffffc90008d18000 R13: ffffc90008d20000 R14: ffffc90008d1f810 R15: ffffc90008d1f7d0 unwind_next_frame+0x1254/0x2390 arch/x86/kernel/unwind_orc.c:672 arch_stack_walk+0xfa/0x170 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x96/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826 slab_free mm/slub.c:3809 [inline] kmem_cache_free+0xf0/0x480 mm/slub.c:3831 pagetable_pte_dtor include/linux/mm.h:2921 [inline] ___pte_free_tlb+0x1d/0x260 arch/x86/mm/pgtable.c:55 __pte_free_tlb arch/x86/include/asm/pgalloc.h:61 [inline] free_pte_range mm/memory.c:193 [inline] free_pmd_range mm/memory.c:211 [inline] free_pud_range mm/memory.c:245 [inline] free_p4d_range mm/memory.c:279 [inline] free_pgd_range+0x4e7/0xb80 mm/memory.c:359 free_pgtables+0x142/0x800 mm/memory.c:402 exit_mmap+0x383/0xa60 mm/mmap.c:3221 __mmput+0x12a/0x4d0 kernel/fork.c:1349 mmput+0x62/0x70 kernel/fork.c:1371 exit_mm kernel/exit.c:567 [inline] do_exit+0x9ad/0x2a20 kernel/exit.c:861 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024 get_signal+0x23ba/0x2790 kernel/signal.c:2892 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:296 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fc46727cae9 Code: Unable to access opcode bytes at 0x7fc46727cabf. RSP: 002b:00007fc4680400c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: 0000000000000008 RBX: 00007fc46739bf80 RCX: 00007fc46727cae9 RDX: 00000000000026e1 RSI: 0000000020000080 RDI: ffffffffffffff9c RBP: 00007fc4672c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fc46739bf80 R15: 00007ffdd7415ba8 </TASK>