On 2/21/24 12:55 PM, syzbot wrote:
Hello, syzbot found the following issue on: HEAD commit: c1ca10ceffbb Merge tag 'scsi-fixes' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10e7f5f0180000 kernel config: https://syzkaller.appspot.com/x/.config?x=e3dd779fba027968 dashboard link: https://syzkaller.appspot.com/bug?extid=f0d29b273acdcd3a2562 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/83d019f0ac47/disk-c1ca10ce.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/49e05dd7a23d/vmlinux-c1ca10ce.xz kernel image: https://storage.googleapis.com/syzbot-assets/68ec9fa2d33d/bzImage-c1ca10ce.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f0d29b273acdcd3a2562@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in bstr_printf+0x19df/0x1b50 lib/vsprintf.c:3334 bstr_printf+0x19df/0x1b50 lib/vsprintf.c:3334 ____bpf_snprintf kernel/bpf/helpers.c:1064 [inline] bpf_snprintf+0x1c8/0x360 kernel/bpf/helpers.c:1044 ___bpf_prog_run+0x2180/0xdb80 kernel/bpf/core.c:1986 __bpf_prog_run288+0xb5/0xe0 kernel/bpf/core.c:2226
#syz dup: [syzbot] [bpf?] [net?] KMSAN: uninit-value in dev_map_lookup_elem
bpf_dispatcher_nop_func include/linux/bpf.h:1231 [inline] __bpf_prog_run include/linux/filter.h:651 [inline] bpf_prog_run include/linux/filter.h:658 [inline] bpf_prog_run_pin_on_cpu include/linux/filter.h:675 [inline] bpf_flow_dissect+0x127/0x470 net/core/flow_dissector.c:991 bpf_prog_test_run_flow_dissector+0x6f4/0xa20 net/bpf/test_run.c:1359 bpf_prog_test_run+0x6af/0xac0 kernel/bpf/syscall.c:4107 __sys_bpf+0x649/0xd60 kernel/bpf/syscall.c:5475 __do_sys_bpf kernel/bpf/syscall.c:5561 [inline] __se_sys_bpf kernel/bpf/syscall.c:5559 [inline] __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5559 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit was stored to memory at: bpf_bprintf_prepare+0x138d/0x23b0 kernel/bpf/helpers.c:1027 ____bpf_snprintf kernel/bpf/helpers.c:1060 [inline] bpf_snprintf+0x141/0x360 kernel/bpf/helpers.c:1044 ___bpf_prog_run+0x2180/0xdb80 kernel/bpf/core.c:1986 __bpf_prog_run288+0xb5/0xe0 kernel/bpf/core.c:2226 bpf_dispatcher_nop_func include/linux/bpf.h:1231 [inline] __bpf_prog_run include/linux/filter.h:651 [inline] bpf_prog_run include/linux/filter.h:658 [inline] bpf_prog_run_pin_on_cpu include/linux/filter.h:675 [inline] bpf_flow_dissect+0x127/0x470 net/core/flow_dissector.c:991 bpf_prog_test_run_flow_dissector+0x6f4/0xa20 net/bpf/test_run.c:1359 bpf_prog_test_run+0x6af/0xac0 kernel/bpf/syscall.c:4107 __sys_bpf+0x649/0xd60 kernel/bpf/syscall.c:5475 __do_sys_bpf kernel/bpf/syscall.c:5561 [inline] __se_sys_bpf kernel/bpf/syscall.c:5559 [inline] __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5559 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Local variable stack created at: __bpf_prog_run288+0x45/0xe0 kernel/bpf/core.c:2226 bpf_dispatcher_nop_func include/linux/bpf.h:1231 [inline] __bpf_prog_run include/linux/filter.h:651 [inline] bpf_prog_run include/linux/filter.h:658 [inline] bpf_prog_run_pin_on_cpu include/linux/filter.h:675 [inline] bpf_flow_dissect+0x127/0x470 net/core/flow_dissector.c:991 CPU: 1 PID: 8904 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-00331-gc1ca10ceffbb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 =====================================================
