Hello,syzbot has tested the proposed patch but the reproducer still triggered crash:
WARNING in bpf_jit_free WARNING: CPU: 0 PID: 9077 at kernel/bpf/core.c:851 bpf_jit_free+0x157/0x1b0 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 9077 Comm: kworker/0:3 Not tainted 5.2.0-rc6+ #1Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events bpf_prog_free_deferred Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 panic+0x2cb/0x744 kernel/panic.c:219 __warn.cold+0x20/0x4d kernel/panic.c:576 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:179 [inline] fixup_bug arch/x86/kernel/traps.c:174 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:986 RIP: 0010:bpf_jit_free+0x157/0x1b0Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 5d 48 b8 00 02 00 00 00 00 ad de 48 39 43 70 0f 84 05 ff ff ff e8 09 7f f4 ff <0f> 0b e9 f9 fe ff ff e8 2d 02 2e 00 e9 d9 fe ff ff 48 89 7d e0 e8
RSP: 0018:ffff888084affcb0 EFLAGS: 00010293 RAX: ffff88808a622100 RBX: ffff88809639d580 RCX: ffffffff817b0b0d RDX: 0000000000000000 RSI: ffffffff817c4557 RDI: ffff88809639d5f0 RBP: ffff888084affcd0 R08: 1ffffffff150daa8 R09: fffffbfff150daa9 R10: fffffbfff150daa8 R11: ffffffff8a86d547 R12: ffffc90001921000 R13: ffff88809639d5e8 R14: ffff8880a0589800 R15: ffff8880ae834d40 bpf_prog_free_deferred+0x27a/0x350 kernel/bpf/core.c:1982 process_one_work+0x989/0x1790 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds.. Tested on: commit: b9321614 bpf: fix precision bit propagation for BPF_ST ins.. git tree: https://github.com/anakryiko/linux bpf-fix-precise-bpf_st console output: https://syzkaller.appspot.com/x/log.txt?x=112f0dfda00000 kernel config: https://syzkaller.appspot.com/x/.config?x=6bb3e6e7997c14f9 compiler: gcc (GCC) 9.0.0 20181231 (experimental)
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