RBP: 00007efe38611f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efe387e6038 R14: 00007efe387e5fa0 R15: 00007ffcfc15c378
 </TASK>
watchdog: BUG: soft lockup - CPU#1 stuck for 246s! [syz.7.14766:15134]
Modules linked in:
CPU: 1 PID: 15134 Comm: syz.7.14766 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:csd_lock_wait kernel/smp.c:453 [inline]
RIP: 0010:smp_call_function_many_cond+0x872/0x960 kernel/smp.c:998
Code: 41 8b 1f 89 de 83 e6 01 31 ff e8 29 66 09 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 0a e8 f5 61 09 00 e9 38 ff ff ff f3 90 <41> 0f b6 44 1d 00 84 c0 75 14 41 f7 07 01 00 00 00 0f 84 1a ff ff
RSP: 0018:ffffc90000d86e60 EFLAGS: 00000246
RAX: ffffffff8166bc2e RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc900043d7000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90000d86fa0 R08: dffffc0000000000 R09: ffffed1022204a45
R10: ffffed1022204a45 R11: 1ffff11022204a44 R12: 1ffff1103ee27218
R13: 1ffff1103ee07ae1 R14: 0000000000000000 R15: ffff8881f703d708
FS:  00007efe393796c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000052000 CR3: 00000001116d4000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x43/0x80 kernel/smp.c:1166
 native_flush_tlb_multi+0x144/0x210 arch/x86/mm/tlb.c:-1
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:87 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:970 [inline]
 flush_tlb_mm_range+0x36a/0x470 arch/x86/mm/tlb.c:1058
 flush_tlb_page arch/x86/include/asm/tlbflush.h:241 [inline]
 ptep_clear_flush+0x111/0x150 mm/pgtable-generic.c:99
 wp_page_copy+0xca3/0x15b0 mm/memory.c:3278
 do_wp_page+0x9f2/0xfc0 mm/memory.c:-1
 handle_pte_fault mm/memory.c:5189 [inline]
 __handle_mm_fault mm/memory.c:5313 [inline]
 handle_mm_fault+0x10e4/0x2640 mm/memory.c:5453
 do_user_addr_fault+0x63b/0x1050 arch/x86/mm/fault.c:1374
 handle_page_fault arch/x86/mm/fault.c:1466 [inline]
 exc_page_fault+0x51/0xb0 arch/x86/mm/fault.c:1522
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0010:copy_user_enhanced_fast_string+0xa/0x40 arch/x86/lib/copy_user_64.S:166
Code: ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 8d 0c ca 89 ca eb 20 0f 01 cb 83 fa 40 72 38 89 d1 <f3> a4 31 c0 0f 01 ca c3 89 ca eb 0a 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000d87680 EFLAGS: 00050206
RAX: ffffffff82619b01 RBX: 00000000000101d0 RCX: 000000000000eee0
RDX: 00000000000101d0 RSI: ffff88811d2c13b8 RDI: 0000200000052000
RBP: ffffc90000d876b0 R08: dffffc0000000000 R09: ffffed1023a5a053
R10: 0000000000000000 R11: 0000000000002030 R12: 00007ffffffeee30
R13: 0000000000010100 R14: ffff88811d2c00c8 R15: 0000200000050d10
 _copy_to_iter+0x3f0/0xe50 lib/iov_iter.c:527
 copy_to_iter include/linux/uio.h:179 [inline]
 simple_copy_to_iter+0x50/0x70 net/core/datagram.c:521
 __skb_datagram_iter+0xf1/0x730 net/core/datagram.c:419
 skb_copy_datagram_iter+0x40/0x150 net/core/datagram.c:535
 skb_copy_datagram_msg include/linux/skbuff.h:4004 [inline]
 tipc_recvstream+0x6fe/0xe80 net/tipc/socket.c:2071
 ____sys_recvmsg+0x2a0/0x590 net/socket.c:-1
 ___sys_recvmsg+0x1b2/0x510 net/socket.c:2770
 __sys_recvmsg net/socket.c:2800 [inline]
 __do_sys_recvmsg net/socket.c:2810 [inline]
 __se_sys_recvmsg net/socket.c:2807 [inline]
 __x64_sys_recvmsg+0x1ed/0x2c0 net/socket.c:2807
 x64_sys_call+0x75/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:48
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efe3858eec9
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:00007efe39379038 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007efe387e5fa0 RCX: 00007efe3858eec9
RDX: 0000000000001f00 RSI: 0000200000000500 RDI: 0000000000000008
RBP: 00007efe38611f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efe387e6038 R14: 00007efe387e5fa0 R15: 00007ffcfc15c378
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 15136 Comm: syz.7.14766 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:native_halt arch/x86/include/asm/irqflags.h:57 [inline]
RIP: 0010:halt arch/x86/include/asm/irqflags.h:98 [inline]
RIP: 0010:kvm_wait+0xcc/0x140 arch/x86/kernel/kvm.c:1058
Code: 20 f6 44 24 21 02 75 24 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 48 0f b6 07 40 38 f0 75 a6 66 90 0f 00 2d 45 96 13 04 f4 <eb> 9a fa 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 3f 0f b6 07
RSP: 0018:ffffc90000e267a0 EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffffc90000fa9080 RCX: ffffffff84f43dc2
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffffc90000fa9080
RBP: ffffc90000e26830 R08: dffffc0000000000 R09: fffff520001f5211
R10: fffff520001f5211 R11: 1ffff920001f5210 R12: 1ffff1103ee00001
R13: ffff8881f7038cf4 R14: dffffc0000000000 R15: 1ffff920001c4cf4
FS:  00007efe393586c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000c7000 CR3: 00000001116d4000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 pv_wait arch/x86/include/asm/paravirt.h:603 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x690/0xc40 kernel/locking/qspinlock.c:511
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
 queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock include/linux/spinlock.h:187 [inline]
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0x108/0x110 kernel/locking/spinlock.c:162
 __bpf_ringbuf_reserve+0x19c/0x500 kernel/bpf/ringbuf.c:413
 ____bpf_ringbuf_output kernel/bpf/ringbuf.c:539 [inline]
 bpf_ringbuf_output+0x68/0x1e0 kernel/bpf/ringbuf.c:529
 bpf_prog_918f90024333f9ff+0x3a/0x3e
 bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
 __bpf_prog_run include/linux/filter.h:603 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline]
 bpf_trace_run2+0xff/0x250 kernel/trace/bpf_trace.c:2322
 __bpf_trace_contention_end+0xb/0x10 include/trace/events/lock.h:122
 trace_contention_end include/trace/events/lock.h:122 [inline]
 __pv_queued_spin_lock_slowpath+0xbff/0xc40 kernel/locking/qspinlock.c:560
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
 queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock include/linux/spinlock.h:187 [inline]
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0x108/0x110 kernel/locking/spinlock.c:162
 __bpf_ringbuf_reserve+0x19c/0x500 kernel/bpf/ringbuf.c:413
 ____bpf_ringbuf_output kernel/bpf/ringbuf.c:539 [inline]
 bpf_ringbuf_output+0x68/0x1e0 kernel/bpf/ringbuf.c:529
 bpf_prog_918f90024333f9ff+0x3a/0x3e
 bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
 __bpf_prog_run include/linux/filter.h:603 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline]
 bpf_trace_run4+0x11b/0x270 kernel/trace/bpf_trace.c:2324
 __bpf_trace_mmap_lock_acquire_returned+0x35/0x40 include/trace/events/mmap_lock.h:52
 __traceiter_mmap_lock_acquire_returned+0x9f/0xf0 include/trace/events/mmap_lock.h:52
 trace_mmap_lock_acquire_returned include/trace/events/mmap_lock.h:52 [inline]
 __mmap_lock_do_trace_acquire_returned+0x17d/0x1d0 mm/mmap_lock.c:102
 __mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
 mmap_read_trylock include/linux/mmap_lock.h:176 [inline]
 get_mmap_lock_carefully mm/memory.c:5481 [inline]
 lock_mm_and_find_vma+0x243/0x320 mm/memory.c:5543
 do_user_addr_fault+0x358/0x1050 arch/x86/mm/fault.c:1346
 handle_page_fault arch/x86/mm/fault.c:1466 [inline]
 exc_page_fault+0x51/0xb0 arch/x86/mm/fault.c:1522
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0010:copy_user_enhanced_fast_string+0xa/0x40 arch/x86/lib/copy_user_64.S:166
Code: ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 8d 0c ca 89 ca eb 20 0f 01 cb 83 fa 40 72 38 89 d1 <f3> a4 31 c0 0f 01 ca c3 89 ca eb 0a 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000e274e0 EFLAGS: 00050206
RAX: ffffffff8261c001 RBX: 00000000000101d0 RCX: 000000000000a8d0
RDX: 00000000000101d0 RSI: 00002000000c7000 RDI: ffff88813fb059c8
RBP: ffffc90000e27510 R08: dffffc0000000000 R09: ffffed1027f62053
R10: 0000000000000000 R11: 0000000000002030 R12: 00007ffffffeee30
R13: 00000000000c1500 R14: 00002000000c1700 R15: ffff88813fb000c8
 _copy_from_iter+0x3e2/0xfd0 lib/iov_iter.c:631
 copy_from_iter include/linux/uio.h:187 [inline]
 copy_from_iter_full include/linux/uio.h:194 [inline]
 tipc_msg_build+0x43f/0xfd0 net/tipc/msg.c:408
 __tipc_sendstream+0x8b3/0x11a0 net/tipc/socket.c:1619
 tipc_sendstream+0x55/0x70 net/tipc/socket.c:1550
 sock_sendmsg_nosec net/socket.c:716 [inline]
 __sock_sendmsg net/socket.c:728 [inline]
 ____sys_sendmsg+0x5a9/0x990 net/socket.c:2509
 ___sys_sendmsg+0x21c/0x290 net/socket.c:2563
 __sys_sendmsg net/socket.c:2592 [inline]
 __do_sys_sendmsg net/socket.c:2601 [inline]
 __se_sys_sendmsg net/socket.c:2599 [inline]
 __x64_sys_sendmsg+0x1f0/0x2c0 net/socket.c:2599
 x64_sys_call+0x171/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efe3858eec9
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:00007efe39358038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007efe387e6090 RCX: 00007efe3858eec9
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000009
RBP: 00007efe38611f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efe387e6128 R14: 00007efe387e6090 R15: 00007ffcfc15c378
 </TASK>