===================================================== BUG: KMSAN: uninit-value in update_stack_state+0x974/0xb40 arch/x86/kernel/unwind_frame.c:238 CPU: 0 PID: 4872 Comm: systemd-journal Not tainted 5.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __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+0x974/0xb40 arch/x86/kernel/unwind_frame.c:238 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_pad+0x47f/0x900 net/core/skbuff.c:1804 __skb_put_padto include/linux/skbuff.h:3218 [inline] skb_put_padto include/linux/skbuff.h:3237 [inline] send_hsr_supervision_frame+0x122d/0x1500 net/hsr/hsr_device.c:299 hsr_announce+0x1e2/0x370 net/hsr/hsr_device.c:330 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 __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:kmsan_get_metadata+0x8/0x180 mm/kmsan/kmsan_shadow.c:175 Code: 06 4a 92 48 c7 c6 d5 06 4a 92 4c 89 f2 31 c0 e8 b0 e2 44 ff 0f 0b 66 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 <53> 41 89 d6 48 89 fb 48 83 e3 fc 85 d2 48 0f 44 df 40 f6 c7 03 48 RSP: 0018:ffffaead80d47ad8 EFLAGS: 00000282 RAX: ffffb6ad80d47b40 RBX: ffffb6ad80d47b40 RCX: ffffaead80d47b40 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffaead80d47b40 RBP: ffffaead80d47ae8 R08: 0000000000000002 R09: ffffaead80d47ad8 R10: 0000000000000004 R11: ffffffff84992840 R12: 0000000000000000 R13: ffffaead80d47bc0 R14: ffffaead80d47b40 R15: 0000000000000001 kmsan_get_shadow_origin_ptr+0x81/0xb0 mm/kmsan/kmsan_shadow.c:154 __msan_metadata_ptr_for_store_8+0x13/0x20 mm/kmsan/kmsan_instr.c:55 __bpf_prog_run32+0xca/0x190 kernel/bpf/core.c:1692 bpf_dispatcher_nop_func include/linux/bpf.h:556 [inline] bpf_prog_run_pin_on_cpu include/linux/filter.h:597 [inline] seccomp_run_filters kernel/seccomp.c:272 [inline] __seccomp_filter+0x59e/0x2720 kernel/seccomp.c:817 __secure_computing+0x1fa/0x380 kernel/seccomp.c:950 syscall_trace_enter+0x63b/0xe10 arch/x86/entry/common.c:194 do_syscall_64+0x54/0x150 arch/x86/entry/common.c:382 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7ff14102c335 Code: Bad RIP value. RSP: 002b:00007ffe3f23ba18 EFLAGS: 00000246 ORIG_RAX: 0000000000000006 RAX: ffffffffffffffda RBX: 000055e20e8c8160 RCX: 00007ff14102c335 RDX: 00007ffe3f23ba50 RSI: 00007ffe3f23ba50 RDI: 000055e20e8c7160 RBP: 00007ffe3f23bb10 R08: 0000000000000003 R09: 0000000000001010 R10: 000055e20e8c4e40 R11: 0000000000000246 R12: 000055e20e8c7160 R13: 000055e20e8c716d R14: 000055e20e8c4de9 R15: 000055e20e8c4ded Local variable ----symlink_target@tomoyo_path_perm created at: tomoyo_path_perm+0x178/0xb30 security/tomoyo/file.c:812 tomoyo_path_perm+0x178/0xb30 security/tomoyo/file.c:812 =====================================================