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charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KASAN: slab-out-of-bounds Read in bq_xmit_all ================================================================== BUG: KASAN: slab-out-of-bounds in bq_xmit_all+0x134/0x11d0 kernel/bpf/devmap.c:385 Read of size 8 at addr ffff88807a2f03a0 by task syz.0.305/6537 CPU: 0 UID: 0 PID: 6537 Comm: syz.0.305 Not tainted 6.10.0-syzkaller-11840-g933069701c1b-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 bq_xmit_all+0x134/0x11d0 kernel/bpf/devmap.c:385 __dev_flush+0x81/0x160 kernel/bpf/devmap.c:425 xdp_do_check_flushed+0x129/0x240 net/core/filter.c:4300 __napi_poll+0xe4/0x490 net/core/dev.c:6774 napi_poll net/core/dev.c:6840 [inline] net_rx_action+0x89b/0x1240 net/core/dev.c:6962 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 common_interrupt+0xaa/0xd0 arch/x86/kernel/irq.c:278 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 RIP: 0010:__sanitizer_cov_trace_switch+0x110/0x120 kernel/kcov.c:342 Code: 43 28 4c 39 f8 77 a3 49 ff c4 4c 89 21 4c 89 44 0b 08 4c 89 74 0b 10 48 89 7c 0b 18 4c 89 4c 0b 20 eb 87 5b 41 5c 41 5e 41 5f cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 RSP: 0018:ffffc90002de6ec0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffff88801cb4da00 RDX: 0000000000000003 RSI: ffffffff8e1a32f0 RDI: 0000000000000002 RBP: ffffffff9033a231 R08: 0000000000000005 R09: ffffffff81411746 R10: 0000000000000003 R11: ffff88801cb4da00 R12: ffffffff9033a230 R13: dffffc0000000000 R14: ffffc90002de6ff0 R15: 1ffff920005bcdf4 unwind_next_frame+0xff6/0x2a00 arch/x86/kernel/unwind_orc.c:581 arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 save_stack+0xfb/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x75/0x3f0 mm/page_owner.c:297 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_folios+0x103a/0x1b00 mm/page_alloc.c:2656 folios_put_refs+0x76e/0x860 mm/swap.c:1039 free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:335 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 exit_mmap+0x44f/0xc80 mm/mmap.c:3395 __mmput+0x115/0x390 kernel/fork.c:1345 exit_mm+0x220/0x310 kernel/exit.c:571 do_exit+0x9b2/0x27f0 kernel/exit.c:869 do_group_exit+0x207/0x2c0 kernel/exit.c:1031 get_signal+0x16a1/0x1740 kernel/signal.c:2917 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7faf1cf75bd9 Code: Unable to access opcode bytes at 0x7faf1cf75baf. RSP: 002b:00007faf1dd780f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007faf1d103f68 RCX: 00007faf1cf75bd9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007faf1d103f68 RBP: 00007faf1d103f60 R08: 00007faf1dd786c0 R09: 00007faf1dd786c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007faf1d103f6c R13: 000000000000000b R14: 00007fff7453a500 R15: 00007fff7453a5e8 Allocated by task 5658: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3988 [inline] slab_alloc_node mm/slub.c:4037 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4044 vm_area_dup+0x27/0x290 kernel/fork.c:486 dup_mmap kernel/fork.c:695 [inline] dup_mm kernel/fork.c:1672 [inline] copy_mm+0xc7b/0x1f30 kernel/fork.c:1721 copy_process+0x187a/0x3dc0 kernel/fork.c:2374 kernel_clone+0x226/0x8f0 kernel/fork.c:2781 __do_sys_clone kernel/fork.c:2924 [inline] __se_sys_clone kernel/fork.c:2908 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2908 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807a2f02e8 which belongs to the cache vm_area_struct of size 184 The buggy address is located 0 bytes to the right of allocated 184-byte region [ffff88807a2f02e8, ffff88807a2f03a0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7a2f0 memcg:ffff88802c3dca01 anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000000 ffff888015eefb40 ffffea0001e7a400 0000000000000009 raw: 0000000000000000 0000000000100010 00000001fdffffff ffff88802c3dca01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x152cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5933, tgid 5933 (dhcpcd-run-hook), ts 112186336296, free_ts 112182429345 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3438 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4696 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2321 allocate_slab+0x5a/0x2f0 mm/slub.c:2484 new_slab mm/slub.c:2537 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723 __slab_alloc+0x58/0xa0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4044 vm_area_dup+0x27/0x290 kernel/fork.c:486 dup_mmap kernel/fork.c:695 [inline] dup_mm kernel/fork.c:1672 [inline] copy_mm+0xc7b/0x1f30 kernel/fork.c:1721 copy_process+0x187a/0x3dc0 kernel/fork.c:2374 kernel_clone+0x226/0x8f0 kernel/fork.c:2781 __do_sys_clone kernel/fork.c:2924 [inline] __se_sys_clone kernel/fork.c:2908 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2908 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5935 tgid 5935 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_folios+0x103a/0x1b00 mm/page_alloc.c:2656 folios_put_refs+0x76e/0x860 mm/swap.c:1039 free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:335 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 exit_mmap+0x44f/0xc80 mm/mmap.c:3395 __mmput+0x115/0x390 kernel/fork.c:1345 exit_mm+0x220/0x310 kernel/exit.c:571 do_exit+0x9b2/0x27f0 kernel/exit.c:869 do_group_exit+0x207/0x2c0 kernel/exit.c:1031 __do_sys_exit_group kernel/exit.c:1042 [inline] __se_sys_exit_group kernel/exit.c:1040 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040 x64_sys_call+0x26c3/0x26d0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88807a2f0280: 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 ffff88807a2f0300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807a2f0380: 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 00 ^ ffff88807a2f0400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807a2f0480: 00 00 00 fc fc fc fc fc fc fc fc fa fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 43 28 4c 39 f8 sub %cl,-0x8(%r9,%r15,1) 5: 77 a3 ja 0xffffffaa 7: 49 ff c4 inc %r12 a: 4c 89 21 mov %r12,(%rcx) d: 4c 89 44 0b 08 mov %r8,0x8(%rbx,%rcx,1) 12: 4c 89 74 0b 10 mov %r14,0x10(%rbx,%rcx,1) 17: 48 89 7c 0b 18 mov %rdi,0x18(%rbx,%rcx,1) 1c: 4c 89 4c 0b 20 mov %r9,0x20(%rbx,%rcx,1) 21: eb 87 jmp 0xffffffaa 23: 5b pop %rbx 24: 41 5c pop %r12 26: 41 5e pop %r14 28: 41 5f pop %r15 * 2a: c3 ret <-- trapping instruction 2b: cc int3 2c: cc int3 2d: cc int3 2e: cc int3 2f: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 36: 00 00 00 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop Tested on: commit: 93306970 Merge tag '6.11-rc-smb3-server-fixes' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12f902b1980000 kernel config: https://syzkaller.appspot.com/x/.config?x=d04f9888ed34da73 dashboard link: https://syzkaller.appspot.com/bug?extid=61a1cfc2b6632363d319 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=11da7f49980000