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BUG: KMSAN: uninit-value in update_stack_state+0x1ee/0xb40 arch/x86/kernel/unwind_frame.c:202
CPU: 0 PID: 14268 Comm: syz-executor.0 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 update_stack_state+0x1ee/0xb40 arch/x86/kernel/unwind_frame.c:202
 unwind_next_frame+0x8c6/0xed0 arch/x86/kernel/unwind_frame.c:305
 arch_stack_walk+0x33e/0x3e0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x117/0x1a0 kernel/stacktrace.c:123
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310
 kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267
 __msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116
 pskb_expand_head+0x38b/0x1b00 net/core/skbuff.c:1636
 skb_unclone include/linux/skbuff.h:1622 [inline]
 tcp_fragment+0x4ce/0x2240 net/ipv4/tcp_output.c:1398
 __tcp_retransmit_skb+0x838/0x3ee0 net/ipv4/tcp_output.c:3011
 tcp_retransmit_skb+0xae/0x430 net/ipv4/tcp_output.c:3085
 tcp_retransmit_timer+0x2c2f/0x3dd0 net/ipv4/tcp_timer.c:528
 tcp_write_timer_handler+0x4fd/0xd10 net/ipv4/tcp_timer.c:611
 tcp_write_timer+0x114/0x290 net/ipv4/tcp_timer.c:631
 call_timer_fn+0x218/0x510 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers+0xd20/0x11c0 kernel/time/timer.c:1773
 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786
 __do_softirq+0x311/0x83d kernel/softirq.c:293
 asm_call_on_stack+0x12/0x20 arch/x86/entry/entry_64.S:711
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:23 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline]
 do_softirq_own_stack+0x7c/0xa0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:390 [inline]
 __irq_exit_rcu+0x226/0x270 kernel/softirq.c:420
 irq_exit_rcu+0xe/0x10 kernel/softirq.c:432
 sysvec_call_function_single+0x107/0x130 arch/x86/kernel/smp.c:243
 asm_sysvec_call_function_single+0x12/0x20 arch/x86/include/asm/idtentry.h:601
RIP: 0010:do_mprotect_pkey+0x9a7/0x11a0 mm/mprotect.c:574
Code: ff 48 8b 4d b0 48 85 d2 0f 84 84 fe ff ff e8 f0 99 aa ff e9 8d fd ff ff e8 06 9a 17 00 48 8b 4d b0 49 39 cf 0f 82 7a fe ff ff <49> 89 de e8 d1 99 aa ff 48 8b 45 98 48 8b 8d 38 ff ff ff 8b 95 78
RSP: 0018:ffffbe6b85a5bd88 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fc905cd5000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffbe6b85a5be98 R08: fffff13c0000000f R09: ffffa2172fffb000
R10: 0000000000000000 R11: ffffffff84d96700 R12: ffffa216859ca320
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fc905cd5000
 __do_sys_mprotect mm/mprotect.c:638 [inline]
 __se_sys_mprotect+0x9d/0xc0 mm/mprotect.c:635
 __x64_sys_mprotect+0x4a/0x70 mm/mprotect.c:635
 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c2d7
Code: Bad RIP value.
RSP: 002b:0000000000c9faf8 EFLAGS: 00000246 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 000000000045c2d7
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 00007fc905cd5000
RBP: 0000000000c9fbe0 R08: 00000000007477e0 R09: 00000000007477e0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000c9fce0
R13: 00007fc905cf5700 R14: 00007fc905cf59c0 R15: 000000000078bfac

Local variable ----lock@locks_remove_posix created at:
 locks_remove_posix+0xaa/0x800 fs/locks.c:2699
 locks_remove_posix+0xaa/0x800 fs/locks.c:2699
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