rcu_gp_fqs_loop kernel/rcu/tree.c:1648 [inline] rcu_gp_kthread+0xc4d/0x1640 kernel/rcu/tree.c:1808 kthread+0x30f/0x330 kernel/kthread.c:288 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [syz-executor.4:12156] Modules linked in: CPU: 1 PID: 12156 Comm: syz-executor.4 Not tainted 5.4.147-syzkaller-00040-g2138e7367558 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_kcov_mode kernel/kcov.c:164 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x23/0x50 kernel/kcov.c:187 Code: 90 90 90 90 90 90 90 48 8b 04 24 65 48 8b 0c 25 80 ed 01 00 65 8b 15 18 1e a1 7e f7 c2 00 01 1f 00 74 01 c3 8b 91 f8 09 00 00 <83> fa 02 75 f4 48 8b 91 00 0a 00 00 48 8b 32 48 8d 7e 01 8b 89 fc RSP: 0018:ffff8881ef187958 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff8156dade RBX: 1ffff1103de30f33 RCX: ffff8881dd91af40 RDX: 0000000000000002 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffff8881ef187a10 R08: ffffffff8156daac R09: ffffed103edc9da1 R10: ffffed103edc9da1 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000001 R14: ffff8881ef187998 R15: 0000000000000000 FS: 00007f19a332e700(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6bbe76efe8 CR3: 00000001a806c000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: csd_lock_wait kernel/smp.c:109 [inline] smp_call_function_single+0x20e/0x410 kernel/smp.c:311 smp_call_function_many+0x5e1/0x860 kernel/smp.c:451 smp_call_function kernel/smp.c:509 [inline] on_each_cpu+0x5b/0x140 kernel/smp.c:616 __purge_vmap_area_lazy+0x103/0x1870 mm/vmalloc.c:1278 try_purge_vmap_area_lazy mm/vmalloc.c:1309 [inline] free_vmap_area_noflush+0x27a/0x2d0 mm/vmalloc.c:1345 free_unmap_vmap_area mm/vmalloc.c:1358 [inline] remove_vm_area+0x1e7/0x200 mm/vmalloc.c:2164 vm_remove_mappings mm/vmalloc.c:2191 [inline] __vunmap+0x1c8/0x8f0 mm/vmalloc.c:2251 __do_replace+0x790/0x9b0 net/ipv6/netfilter/ip6_tables.c:1105 do_replace net/ipv4/netfilter/ip_tables.c:1140 [inline] do_ipt_set_ctl+0x32f/0x4d0 net/ipv4/netfilter/ip_tables.c:1674 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x2ad/0x2d0 net/netfilter/nf_sockopt.c:115 __sys_setsockopt+0x471/0x700 net/socket.c:2074 __do_sys_setsockopt net/socket.c:2090 [inline] __se_sys_setsockopt net/socket.c:2087 [inline] __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2087 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f19a55b7ae9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f19a332e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f19a56caf60 RCX: 00007f19a55b7ae9 RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f19a5611f25 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000020000200 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe9b5f6ddf R14: 00007f19a332e300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 12167 Comm: syz-executor.0 Not tainted 5.4.147-syzkaller-00040-g2138e7367558 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:native_halt arch/x86/include/asm/irqflags.h:66 [inline] RIP: 0010:halt arch/x86/include/asm/irqflags.h:112 [inline] RIP: 0010:kvm_wait+0xa9/0x100 arch/x86/kernel/kvm.c:834 Code: d8 48 c1 e8 03 42 8a 04 38 84 c0 75 52 8a 03 44 38 e0 75 26 41 f7 c6 00 02 00 00 75 0f e9 07 00 00 00 0f 00 2d 98 1a 5a 03 f4 0e e9 07 00 00 00 0f 00 2d 89 1a 5a 03 fb f4 4c 89 34 24 ff 34 RSP: 0018:ffff8881b0297618 EFLAGS: 00000046 RAX: 1ffff110350c3603 RBX: ffff8881a861b138 RCX: ffffffff8149fe67 RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff8881a861b138 RBP: 1ffff11036052ec4 R08: dffffc0000000000 R09: ffffed10350c3628 R10: ffffed10350c3628 R11: 0000000000000000 R12: 0000000000000003 R13: 1ffff110350c3627 R14: 0000000000000046 R15: dffffc0000000000 FS: 00007f9b14719700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32121000 CR3: 00000001793c6000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pv_wait arch/x86/include/asm/paravirt.h:652 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline] __pv_queued_spin_lock_slowpath+0x6d1/0xbf0 kernel/locking/qspinlock.c:507 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:642 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:50 [inline] queued_spin_lock include/asm-generic/qspinlock.h:81 [inline] do_raw_spin_lock_flags include/linux/spinlock.h:193 [inline] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irqsave+0x11c/0x190 kernel/locking/spinlock.c:159 __wake_up_common_lock kernel/sched/wait.c:122 [inline] __wake_up+0x98/0x110 kernel/sched/wait.c:142 ep_poll_safewake fs/eventpoll.c:581 [inline] ep_poll_callback+0x66b/0x930 fs/eventpoll.c:1287 __wake_up_common+0x25a/0x460 kernel/sched/wait.c:93 __wake_up_common_lock kernel/sched/wait.c:123 [inline] __wake_up+0xb1/0x110 kernel/sched/wait.c:142 __io_commit_cqring fs/io_uring.c:496 [inline] io_commit_cqring+0xb1c/0x13d0 fs/io_uring.c:559 io_poll_complete fs/io_uring.c:1803 [inline] io_poll_wake+0x8ac/0xb40 fs/io_uring.c:1861 __wake_up_common+0x25a/0x460 kernel/sched/wait.c:93 __wake_up_common_lock kernel/sched/wait.c:123 [inline] __wake_up+0xb1/0x110 kernel/sched/wait.c:142 ep_poll_safewake fs/eventpoll.c:581 [inline] ep_scan_ready_list+0x683/0x6d0 fs/eventpoll.c:758 ep_eventpoll_poll+0xcc/0x120 fs/eventpoll.c:941 vfs_poll include/linux/poll.h:90 [inline] io_poll_add fs/io_uring.c:1930 [inline] __io_submit_sqe+0x1f98/0x3980 fs/io_uring.c:2143 __io_queue_sqe+0x39/0xc70 fs/io_uring.c:2459 io_ring_submit fs/io_uring.c:2967 [inline] __do_sys_io_uring_enter fs/io_uring.c:3853 [inline] __se_sys_io_uring_enter+0x7ee/0x1d40 fs/io_uring.c:3814 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f9b169a2ae9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9b14719188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f9b16ab5f60 RCX: 00007f9b169a2ae9 RDX: 0000000000000000 RSI: 00000000000002ff RDI: 0000000000000006 RBP: 00007f9b169fcf25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff1f22e34f R14: 00007f9b14719300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 48 8b 04 24 mov (%rsp),%rax b: 65 48 8b 0c 25 80 ed mov %gs:0x1ed80,%rcx 12: 01 00 14: 65 8b 15 18 1e a1 7e mov %gs:0x7ea11e18(%rip),%edx # 0x7ea11e33 1b: f7 c2 00 01 1f 00 test $0x1f0100,%edx 21: 74 01 je 0x24 23: c3 retq 24: 8b 91 f8 09 00 00 mov 0x9f8(%rcx),%edx * 2a: 83 fa 02 cmp $0x2,%edx <-- trapping instruction 2d: 75 f4 jne 0x23 2f: 48 8b 91 00 0a 00 00 mov 0xa00(%rcx),%rdx 36: 48 8b 32 mov (%rdx),%rsi 39: 48 8d 7e 01 lea 0x1(%rsi),%rdi 3d: 8b .byte 0x8b 3e: 89 fc mov %edi,%esp