Hello:
This series was applied to bpf/bpf-next.git (master)
by Andrii Nakryiko <andrii@xxxxxxxxxx>:
On Fri, 23 May 2025 21:13:35 -0700 you wrote:
> Yi Lai reported an issue ([1]) where the following warning appears
> in kernel dmesg:
> [ 60.643604] verifier backtracking bug
> [ 60.643635] WARNING: CPU: 10 PID: 2315 at kernel/bpf/verifier.c:4302 __mark_chain_precision+0x3a6c/0x3e10
> [ 60.648428] Modules linked in: bpf_testmod(OE)
> [ 60.650471] CPU: 10 UID: 0 PID: 2315 Comm: test_progs Tainted: G OE 6.15.0-rc4-gef11287f8289-dirty #327 PREEMPT(full)
> [ 60.654385] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
> [ 60.656682] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
> [ 60.660475] RIP: 0010:__mark_chain_precision+0x3a6c/0x3e10
> [ 60.662814] Code: 5a 30 84 89 ea e8 c4 d9 01 00 80 3d 3e 7d d8 04 00 0f 85 60 fa ff ff c6 05 31 7d d8 04
> 01 48 c7 c7 00 58 30 84 e8 c4 06 a5 ff <0f> 0b e9 46 fa ff ff 48 ...
> [ 60.668720] RSP: 0018:ffff888116cc7298 EFLAGS: 00010246
> [ 60.671075] RAX: 54d70e82dfd31900 RBX: ffff888115b65e20 RCX: 0000000000000000
> [ 60.673659] RDX: 0000000000000001 RSI: 0000000000000004 RDI: 00000000ffffffff
> [ 60.676241] RBP: 0000000000000400 R08: ffff8881f6f23bd3 R09: 1ffff1103ede477a
> [ 60.678787] R10: dffffc0000000000 R11: ffffed103ede477b R12: ffff888115b60ae8
> [ 60.681420] R13: 1ffff11022b6cbc4 R14: 00000000fffffff2 R15: 0000000000000001
> [ 60.684030] FS: 00007fc2aedd80c0(0000) GS:ffff88826fa8a000(0000) knlGS:0000000000000000
> [ 60.686837] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 60.689027] CR2: 000056325369e000 CR3: 000000011088b002 CR4: 0000000000370ef0
> [ 60.691623] Call Trace:
> [ 60.692821] <TASK>
> [ 60.693960] ? __pfx_verbose+0x10/0x10
> [ 60.695656] ? __pfx_disasm_kfunc_name+0x10/0x10
> [ 60.697495] check_cond_jmp_op+0x16f7/0x39b0
> [ 60.699237] do_check+0x58fa/0xab10
> ...
>
> [...]
Here is the summary with links:
- [bpf-next,v5,1/2] bpf: Do not include stack ptr register in precision backtracking bookkeeping
https://git.kernel.org/bpf/bpf-next/c/e2d2115e56c4
- [bpf-next,v5,2/2] selftests/bpf: Add tests with stack ptr register in conditional jmp
https://git.kernel.org/bpf/bpf-next/c/5ffb537e416e
You are awesome, thank you!
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