Kernel panic observed after booting 5.14.0-427.13.1.el9_4.x86_64 by falcon-sensor process.

Issue

• eBPF program causes kernel panic on kernels 5.14.0-410+ .

• Below is an example of a kernel panic on the falcon-sensor process, observed after booting on kernel version 5.14.0-427.13.1.el9_4.x86_64.

  [  462.396258] BUG: unable to handle page fault for address: ffff9a4bdb0f2d88
  [  462.396291] #PF: supervisor write access in kernel mode
  [  462.396309] #PF: error_code(0x0002) - not-present page
  [  462.396327] PGD 14e203067 P4D 14e203067 PUD 0 
  [  462.396345] Oops: 0002 [#1] PREEMPT SMP NOPTI
  [  462.397204] CPU: 1 PID: 6496 Comm: falcon-sensor-b Kdump: loaded Not tainted 5.14.0-427.13.1.el9_4.x86_64 #1
  [  462.397838] Hardware name: VMware, Inc. VMware7,1/440BX Desktop Reference Platform, BIOS VMW71.00V.21100432.B64.2301110304 01/11/2023
  [  462.398482] RIP: 0010:backtrack_insn+0x408/0x800
  [  462.399131] Code: 30 00 0f 85 64 fd ff ff 41 ba 01 00 00 00 b9 01 00 00 00 45 8d 48 ff 44 89 d0 d3 e0 85 c2 74 0f 89 c6 f7 d6 21 d6 89 74 bb 0c <42> 09 44 8b 0c 83 c1 01 83 f9 06 0f 84 71 01 00 00 44 89 d0 8b 54
  [  462.400531] RSP: 0018:ffffbdf980977a80 EFLAGS: 00010246
  [  462.401231] RAX: 0000000000000002 RBX: ffff9a47db0f2d80 RCX: 0000000000000001
  [  462.401937] RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
  [  462.402631] RBP: ffff9a47db0f0000 R08: 0000000000000000 R09: 00000000ffffffff
  [  462.403325] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000058
  [  462.404026] R13: ffff9a47db0f0a90 R14: ffff9a47ea2f6000 R15: ffffbdf982a5f300
  [  462.404722] FS:  00007f8228020740(0000) GS:ffff9a48b5e40000(0000) knlGS:0000000000000000
  [  462.405432] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [  462.406152] CR2: ffff9a4bdb0f2d88 CR3: 000000012b41a000 CR4: 00000000003506e0
  [  462.406901] Call Trace:
  [  462.407611]  <TASK>
  [  462.408306]  ? srso_return_thunk+0x5/0x5f
  [  462.408999]  ? show_trace_log_lvl+0x26e/0x2df
  [  462.409686]  ? show_trace_log_lvl+0x26e/0x2df
  [  462.410372]  ? __mark_chain_precision+0x166/0x630
  [  462.411058]  ? __die_body.cold+0x8/0xd
  [  462.411742]  ? page_fault_oops+0x134/0x170
  [  462.412429]  ? srso_return_thunk+0x5/0x5f
  [  462.413135]  ? kernelmode_fixup_or_oops+0x84/0x110
  [  462.413823]  ? exc_page_fault+0xa8/0x150
  [  462.414512]  ? asm_exc_page_fault+0x22/0x30
  [  462.415210]  ? backtrack_insn+0x408/0x800
  [  462.415909]  ? copy_array+0x4d/0xb0
  [  462.416621]  ? __pfx_verbose+0x10/0x10
  [  462.417321]  ? __pfx_disasm_kfunc_name+0x10/0x10
  [  462.418023]  __mark_chain_precision+0x166/0x630
  [  462.418725]  check_cond_jmp_op+0x738/0xbd0
  [  462.419432]  ? is_state_visited+0x450/0x740
  [  462.420157]  do_check+0x85b/0xac0
  [  462.420854]  do_check_common+0x2a9/0x340
  [  462.421566]  bpf_check+0xf7c/0x10a0
  [  462.422250]  ? srso_return_thunk+0x5/0x5f
  [  462.422929]  ? __kmem_cache_alloc_node+0x1c7/0x2d0
  [  462.423578]  ? __x86_indirect_jump_thunk_r15+0x20/0x5e
  [  462.424234]  bpf_prog_load+0x636/0x970