Hello, syzbot found the following issue on: HEAD commit: bdefec9a minor fix git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=11cee1d7d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=4e6842a91012889c dashboard link: https://syzkaller.appspot.com/bug?extid=2789bd545fa0d4a22f07 compiler: Debian clang version 11.0.1-2 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2789bd545fa0d4a22f07@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in ieee802154_subif_frame net/mac802154/rx.c:67 [inline] BUG: KMSAN: uninit-value in __ieee802154_rx_handle_packet net/mac802154/rx.c:212 [inline] BUG: KMSAN: uninit-value in ieee802154_rx+0x19c4/0x20e0 net/mac802154/rx.c:284 CPU: 0 PID: 6808 Comm: syz-executor.3 Not tainted 5.12.0-rc6-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:79 [inline] dump_stack+0x24c/0x2e0 lib/dump_stack.c:120 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x5c/0xa0 mm/kmsan/kmsan_instr.c:197 ieee802154_subif_frame net/mac802154/rx.c:67 [inline] __ieee802154_rx_handle_packet net/mac802154/rx.c:212 [inline] ieee802154_rx+0x19c4/0x20e0 net/mac802154/rx.c:284 ieee802154_tasklet_handler+0x193/0x2e0 net/mac802154/main.c:35 tasklet_action_common+0x3de/0x640 kernel/softirq.c:557 tasklet_action+0x30/0x40 kernel/softirq.c:577 __do_softirq+0x1b9/0x715 kernel/softirq.c:345 do_softirq+0x123/0x1c0 kernel/softirq.c:248 </IRQ> __local_bh_enable_ip+0xa1/0xb0 kernel/softirq.c:198 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:745 [inline] __dev_queue_xmit+0x3b4a/0x4600 net/core/dev.c:4221 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4227 dgram_sendmsg+0x1142/0x15d0 net/ieee802154/socket.c:682 ieee802154_sock_sendmsg+0xec/0x130 net/ieee802154/socket.c:97 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg net/socket.c:674 [inline] ____sys_sendmsg+0xcfc/0x12f0 net/socket.c:2350 ___sys_sendmsg net/socket.c:2404 [inline] __sys_sendmsg+0x714/0x830 net/socket.c:2433 __compat_sys_sendmsg net/compat.c:347 [inline] __do_compat_sys_sendmsg net/compat.c:354 [inline] __se_compat_sys_sendmsg+0xa7/0xc0 net/compat.c:351 __ia32_compat_sys_sendmsg+0x4a/0x70 net/compat.c:351 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline] __do_fast_syscall_32+0x127/0x180 arch/x86/entry/common.c:142 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:167 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:210 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f5e549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f55585fc EFLAGS: 00000296 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000500 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 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 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 ieee802154_parse_frame_start net/mac802154/rx.c:156 [inline] __ieee802154_rx_handle_packet net/mac802154/rx.c:198 [inline] ieee802154_rx+0xd92/0x20e0 net/mac802154/rx.c:284 ieee802154_tasklet_handler+0x193/0x2e0 net/mac802154/main.c:35 tasklet_action_common+0x3de/0x640 kernel/softirq.c:557 tasklet_action+0x30/0x40 kernel/softirq.c:577 __do_softirq+0x1b9/0x715 kernel/softirq.c:345 Local variable ----hdr.i@ieee802154_rx created at: __ieee802154_rx_handle_packet net/mac802154/rx.c:196 [inline] ieee802154_rx+0xb3d/0x20e0 net/mac802154/rx.c:284 __ieee802154_rx_handle_packet net/mac802154/rx.c:196 [inline] ieee802154_rx+0xb3d/0x20e0 net/mac802154/rx.c:284 ===================================================== ===================================================== BUG: KMSAN: uninit-value in ieee802154_subif_frame net/mac802154/rx.c:69 [inline] BUG: KMSAN: uninit-value in __ieee802154_rx_handle_packet net/mac802154/rx.c:212 [inline] BUG: KMSAN: uninit-value in ieee802154_rx+0x1a9f/0x20e0 net/mac802154/rx.c:284 CPU: 0 PID: 6808 Comm: syz-executor.3 Tainted: G B 5.12.0-rc6-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:79 [inline] dump_stack+0x24c/0x2e0 lib/dump_stack.c:120 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x5c/0xa0 mm/kmsan/kmsan_instr.c:197 ieee802154_subif_frame net/mac802154/rx.c:69 [inline] __ieee802154_rx_handle_packet net/mac802154/rx.c:212 [inline] ieee802154_rx+0x1a9f/0x20e0 net/mac802154/rx.c:284 ieee802154_tasklet_handler+0x193/0x2e0 net/mac802154/main.c:35 tasklet_action_common+0x3de/0x640 kernel/softirq.c:557 tasklet_action+0x30/0x40 kernel/softirq.c:577 __do_softirq+0x1b9/0x715 kernel/softirq.c:345 do_softirq+0x123/0x1c0 kernel/softirq.c:248 </IRQ> __local_bh_enable_ip+0xa1/0xb0 kernel/softirq.c:198 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:745 [inline] __dev_queue_xmit+0x3b4a/0x4600 net/core/dev.c:4221 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4227 dgram_sendmsg+0x1142/0x15d0 net/ieee802154/socket.c:682 ieee802154_sock_sendmsg+0xec/0x130 net/ieee802154/socket.c:97 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg net/socket.c:674 [inline] ____sys_sendmsg+0xcfc/0x12f0 net/socket.c:2350 ___sys_sendmsg net/socket.c:2404 [inline] __sys_sendmsg+0x714/0x830 net/socket.c:2433 __compat_sys_sendmsg net/compat.c:347 [inline] __do_compat_sys_sendmsg net/compat.c:354 [inline] __se_compat_sys_sendmsg+0xa7/0xc0 net/compat.c:351 __ia32_compat_sys_sendmsg+0x4a/0x70 net/compat.c:351 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline] __do_fast_syscall_32+0x127/0x180 arch/x86/entry/common.c:142 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:167 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:210 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f5e549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f55585fc EFLAGS: 00000296 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000500 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 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 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 ieee802154_parse_frame_start net/mac802154/rx.c:156 [inline] __ieee802154_rx_handle_packet net/mac802154/rx.c:198 [inline] ieee802154_rx+0xd92/0x20e0 net/mac802154/rx.c:284 ieee802154_tasklet_handler+0x193/0x2e0 net/mac802154/main.c:35 tasklet_action_common+0x3de/0x640 kernel/softirq.c:557 tasklet_action+0x30/0x40 kernel/softirq.c:577 __do_softirq+0x1b9/0x715 kernel/softirq.c:345 Local variable ----hdr.i@ieee802154_rx created at: __ieee802154_rx_handle_packet net/mac802154/rx.c:196 [inline] ieee802154_rx+0xb3d/0x20e0 net/mac802154/rx.c:284 __ieee802154_rx_handle_packet net/mac802154/rx.c:196 [inline] ieee802154_rx+0xb3d/0x20e0 net/mac802154/rx.c:284 ===================================================== --- This report is generated by a bot. 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