===================================================== BUG: KMSAN: uninit-value in stack_trace_consume_entry+0x171/0x310 kernel/stacktrace.c:88 CPU: 1 PID: 8238 Comm: syz-fuzzer Not tainted 5.10.0-rc4-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+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197 stack_trace_consume_entry+0x171/0x310 kernel/stacktrace.c:88 arch_stack_walk+0x2fa/0x3c0 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0x117/0x1a0 kernel/stacktrace.c:121 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:289 kmsan_memcpy_memmove_metadata+0x25e/0x2d0 mm/kmsan/kmsan.c:226 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:246 __msan_memcpy+0x46/0x60 mm/kmsan/kmsan_instr.c:110 sock_write_iter+0x5f6/0x680 net/socket.c:999 call_write_iter include/linux/fs.h:1903 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x1087/0x1b10 fs/read_write.c:605 ksys_write+0x2af/0x4d0 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:667 __x64_sys_write+0x4a/0x70 fs/read_write.c:667 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4b117b Code: ff e9 69 ff ff ff cc cc cc cc cc cc cc cc cc e8 9b c2 f8 ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 RSP: 002b:000000c0013f73a0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000c00001e800 RCX: 00000000004b117b RDX: 0000000000000004 RSI: 000000c00000a200 RDI: 0000000000000006 RBP: 000000c0013f73f0 R08: 000000c00000a201 R09: 0000000000000004 R10: 0000000000000008 R11: 0000000000000202 R12: 000000000000011e R13: 000000c0005e6000 R14: 000000000000003f R15: 00000000000050ef Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:289 __msan_chain_origin+0x57/0xa0 mm/kmsan/kmsan_instr.c:147 stack_trace_save+0x193/0x1a0 kernel/stacktrace.c:115 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:289 kmsan_memcpy_memmove_metadata+0x25e/0x2d0 mm/kmsan/kmsan.c:226 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:246 __msan_memcpy+0x46/0x60 mm/kmsan/kmsan_instr.c:110 sock_write_iter+0x5f6/0x680 net/socket.c:999 call_write_iter include/linux/fs.h:1903 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x1087/0x1b10 fs/read_write.c:605 ksys_write+0x2af/0x4d0 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:667 __x64_sys_write+0x4a/0x70 fs/read_write.c:667 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Local variable ----regs@__bpf_prog_run32 created at: __bpf_prog_run32+0x84/0x190 kernel/bpf/core.c:1697 __bpf_prog_run32+0x84/0x190 kernel/bpf/core.c:1697 =====================================================